Bring Fun Back to JS: Refactoring Toward Ember

Presented at RailsConf 2014

You just wanted to add some nice interactive functionality to your Rails app. But then one jQuery plugin turns to three, add a dash of statefulness, some error handling, and suddenly you can't sleep at night.

We'll walk through using Ember Components to test-drive a refactor until your front-end code is understandable, usable, and extensible. Armed with TDD and components, you can start to get excited, not exasperated, when asked to add advanced client-side interactions to your website.

Transcript

1. A journey into the heart of architecture Refactoring Toward Ember
2. Engineering
3. Architecture
4. Craftsmanship
5. Cloud gineering itecture smanship
6. These are all things More specifically, they are all things this talk is not about
7. Brandon Hays Cloudgineer
8. Credentials YMCA basketball participant Beat Mario 3 (almost) Donut master Marathoner (Breaking Bad seasons 1-5) Karate Champ Champ Hacked the Gibson Can recite Back to the Future from memory 3 years jazz, 2 years tap Creator of 0 frameworks My mom says I am cool Friends with @fivetanley Very nearly graduated high school
9. We don’t live here
10. Where we live A tale of two cities. Three cities, actually. And not really a tale.
11. Salt Lake City
12. Salt Lake City Salt Lake City
13. We don’t live here.
14. Austin
15. We don’t even live here.
16. We live here.
17. Charming, right?
18. Temporary made permanent
19. Unskilled labor, Found materials
20. No fire codes
21. Refactoring Toward Ember A journey into the heart of architecture madness
22. The Ball of Mud Pattern Throwaway Code Piecemeal Growth Result: Shantytown http://laputan.org/mud/
23. How does this happen? “This should be easy” “Has to happen this week” “Proof of concept”
24. How does this happen? Myth of the 2-week feature Under-experienced labor Prototypes in production
25. A shantytown story How the feature that starts too small to design becomes too big to maintain
28. I’m taking a stand. “Gif” is pronounced like “Github Gist”.
29. * ce5486d - Initial commit * 96db2d4 - Basic app with auth * f97c86b - AJAX posting of body without URL The Sprinkling of JS
30. The Sprinkling of JS
31. Feature request: Submit a gif from main page
32. // A single tumbleweed passes by js/main.js
33. $(document).ready(function(){ $('#toggle-post-dialog').on("click", function(e) { e.preventDefault(); $('#share-section .button-area').hide('fade'); $('#gif-post-dialog').show('blind'); }); }); js/main.js
34. Can it submit via AJAX? Oh! Thanks, but...
35. $('button.gif-submit').on("click", function(e) { e.preventDefault(); $(this).hide("fade"); var url = $(this).attr('href'); var body = $("#new-gif-body").val(); $.ajax({ type: "POST", dataType: "json", url: url, data: { gif_post: { body: body, user_id: currentUserId } } }); }); js/main.js
36. Why does the new post not show up on the page? Terrific! Except...
37. Oh goody, string concat into the DOM .done(function(data) { $('.button.gif-submit').show('fade'); $('.share-gif-form').hide('fade'); $("#new-gif-body").val(""); $('#gif-post-dialog').append("<p class='success-text'>New gif posted: " + post.url + "</p>"); var newRow = '<td>' + username + '</td><td>' + post.url + '</td><td>' + body + '</ td><td><a href="/gif_posts/' + post.id + '">Show</a></td><td><a href="/gif_posts/' + post.id + '/edit">Edit</a></td><td><a data-confirm="Are you sure?" data- method="delete" href="/gif_posts/' + post.id + '" rel="nofollow">Destroy</a></td>'; $('table.gif-list tbody').append(newRow); });
38. Agile Your Code™ That’s Cloudgineering™
39. * ce5486d - Initial commit * 96db2d4 - Basic app with auth * f97c86b - AJAX posting of body without URL * a38f598 - Extract URL and display gif * 602fabb - add cancel button * 81e0f72 - auto-disable input with message without valid gif The Steady Rain of JS
40. The Steady Rain of JS
41. Hiya, sport! Got a minute? What if users want to cancel?
42. $('#gif-post-dialog button.cancel-post').on("click", function(e) { e.preventDefault(); $('button.gif-submit').show('fade'); $('#share-section .button-area').show('fade'); $("#new-gif-body").val(""); $('#gif-post-dialog').hide('blind'); }); js/main.js
43. Great job slugger, but... Users are submitting garbage, we should validate that client side.
44. $('#new-gif-body').bind("input propertychange", function(e) { var parsedUrl = $(this).val().match(/(((ftp|https?):\/\/)(www\.)?|www\.)([\da-z-_ \.]+)([a-z\.]{2,7})([\/\w\.-_\?\&]*)*\/?/); var isGif = !!parsedUrl ? /.gif$/.test(parsedUrl[0]) : null; if (!!isGif) { $("#gif-post-dialog button.gif-submit").removeAttr("disabled"); $('#gif-post-dialog .message').text("") $('#gif-post-dialog .message').hide() } else { $('#gif-post-dialog .message').show() $('#gif-post-dialog .message').text("There is no valid gif link in this post.") $("#gif-post-dialog button.gif-submit").attr("disabled", "disabled"); } }); js/main.js
45. * ce5486d - Initial commit * 96db2d4 - Basic app with auth * f97c86b - AJAX posting of body without URL * a38f598 - Extract URL and display gif * 602fabb - add cancel button * 81e0f72 - auto-disable input with message without valid gif * 3389c4f - add character count and validation * 3eb1560 - restrict edit/delete privileges to current user's data * 997ed02 - handle network and validation errors * a3896fd - async delete post The Torrential Downpour of JS
46. The Torrential Downpour of JS
47. Fabulous! Just a couple more things. Gif preview Smart character count
48. js/main.js if (!!isGif) { charCount = ($(this).val().length - parsedUrl[0].length) if (charCount <= 140) { $("#gif-post-dialog a.gif-submit").removeAttr("disabled"); $('#gif-post-dialog .message').text("").removeClass("error").hide(); $('#gif-post-dialog .gif-preview-container').html('<div class="gif-preview"><img src="' + parsedUrl[0] + '" width="90"></div>') } else { $('#gif-post-dialog .message').show().addClass("validation-error").text("Your message is too long."); $("#gif-post-dialog a.gif-submit").attr("disabled", "disabled"); } } $("#gif-post-dialog .character-count-number").text(charCount);
49. Craftsmanship.
50. Ship it.
51. That’s Cloudgineering™ Craftsmanship It.
52. $(document).ready(function(){ $('#toggle-post-dialog').on("click", function(e) { e.preventDefault(); $("#new-gif-body").val(""); $('#share-section .button-area').hide('fade'); $('#gif-post-dialog').show('blind'); $("#gif-post-dialog a.gif-submit").attr("disabled", "disabled"); }); $('#gif-post-dialog').on("click", 'a.cancel-post', function(e) { e.preventDefault(); $('#share-section .button-area').show('fade'); $("#new-gif-body").val(""); $('#gif-post-dialog').hide('blind'); }); $('#new-gif-body').on("input propertychange", function(e) { var parsedUrl = $(this).val().match(/https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,4}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/); var isGif = !!parsedUrl ? /.gif$/.test(parsedUrl) : null; var charCount if (!!isGif) { charCount = ($(this).val().length - parsedUrl[0].length) if (charCount <= 140) { $("#gif-post-dialog a.gif-submit").removeAttr("disabled"); $('#gif-post-dialog .message').text("").removeClass("error").hide(); $('#gif-post-dialog .gif-preview-container').html('<div class="gif-preview"><img src="' + parsedUrl[0] + '" width="90"></div>') } else { $('#gif-post-dialog .message').show().addClass("validation-error").text("Your message is too long."); $("#gif-post-dialog a.gif-submit").attr("disabled", "disabled"); } } else { charCount = $(this).val().length $('#gif-post-dialog .message').show().addClass("validation-error").text("There is no valid gif link in this post.") $('#gif-post-dialog .gif-preview').remove() $("#gif-post-dialog a.gif-submit").attr("disabled", "disabled"); } $("#gif-post-dialog .character-count-number").text(charCount); }); $('section.gif-list').on("click", "article a[data-gif-delete]", function(e) { e.preventDefault(); console.log(e); var url = $(this).attr('href'); var id = $(this).data('gifPostId'); if(confirm('Are you sure you want to delete this post?')){ $.ajax({ type: "DELETE", dataType: "json", url: url }).done(function(data) { $('section.gif-list article[data-gif-post-id=' + id.toString() + ']').remove(); }); } }); $('#gif-post-dialog').on("click", 'a.gif-submit', function(e) { e.preventDefault(); var currentUserId = $('meta[name="current-user-id"]').attr("content"); $(this).attr("disabled", "disabled"); var url = $(this).attr('href'); var body = $("#new-gif-body").val(); var parsedUrl = body.match(/https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,4}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/); $.ajax({ type: "POST", dataType: "json", url: url, data: { gif_post: { body: body, url: parsedUrl[0], } } }).done(function(data) { var post = data.gif_post; var url = post.url || ""; var username = (!!post.user && !!post.user.username) ? post.user.username : ""; var body = post.body || null; $('#gif-post-dialog .message').removeClass("error").text(""); $('.share-gif-form').hide('fade'); $("#gif-post-dialog .character-count-number").text("0"); $('#gif-post-dialog .message').show().addClass("success").text("New gif posted: " + post.url); var newArticle = '<article class="gif-entry" data-gif-entry data-gif-post-id="' + post.id + '"><div class="gif-entry-image"><img class="framed" src="' + url + '"></div><div class="gif-entry-body">' + body + '</div><div class="gif-entry-delete"><a class="btn btn-danger"data-gif-delete data-gif-post-id="' + post.id + '" href="/ gif_posts/' + post.id + '" rel="nofollow">Delete</a></div><div class="gif-entry-user">Shared by ' + username + '</div><div class="gif-entry-permalink"><a href="/gif_posts/' + post.id + '">Permalink</a></div><div style="clear:both;"></div></article>'; $('section.gif-list').prepend(newArticle); setTimeout(function() { $('#share-section .button-area').show('fade'); $('#gif-post-dialog .message').hide().text(""); $('#gif-post-dialog .gif-preview').remove() $('#gif-post-dialog').hide('blind'); $('.share-gif-form').show(); }, 5000); }).fail(function(data) { if (!data.responseText) { $('#gif-post-dialog .message').show().addClass("error").text("There was an error posting your gif. Please wait and try again."); } else { $('#gif-post-dialog .message').show().addClass("error").text(data.responseJSON.errors.url[0]); } setTimeout(function() { $('#gif-post-dialog .message').removeClass("error").hide(); $("#gif-post-dialog a.gif-submit").removeAttr("disabled"); }, 5000); }); }); }); js/main.js
53. Code shape: Sack of hot garbage
54. * ce5486d - Initial commit * 96db2d4 - Basic app with auth * f97c86b - AJAX posting of body without URL * a38f598 - Extract URL and display gif * 602fabb - add cancel button * 81e0f72 - auto-disable input with message without valid gif * 3389c4f - add character count and validation * 3eb1560 - restrict edit/delete privileges to current user's data * 997ed02 - handle network and validation errors * a3896fd - async delete post * lolnope - that’s it, I quit The Tsunami of JS
55. The Tsunami of JS
56. Excellent work! Add a “Like” button with a count, and we’ re all set!
58. Sweeping under the rug Reconstruction Block-by-block renovation (keeping it working) Quit your job Now what? http://laputan.org/mud/
59. Black box: Sometimes OK Rewrite: Painful lessons about hidden functionality Refactor: Haaard Quit: Time to stop running from your problems, pal Now what?
60. Exponential change cost Inconsistent behavior Long use == more errors Why refactor?
61. Because you can’t sleep at night
62. Make code more idiomatic Refactor to JS objects Path 1: DIY from scratch
63. Use models to manage data & state Get the heck out of the DOM Path 2: Lean on a Framework
64. Our goal: Get out of managing the DOM as fast as humanly possible
65. 1. Wrap it 2. Test it 3. Identify Models 4. Identify States 5. Break it up 5 steps
66. Model layer Bindings to manage state Components Why Ember?
67. 1. Rap it
68. 1. Rap it 1. Wrap it
69. 1. Move code into Ember Component 2. Move markup into handlebars template 3. Insert into original DOM A sprinkling of Ember
70. Code this bad goes to code jail
71. App.GfNewPostComponent = Ember.Component.extend({ layoutName: "components/gf-new-post", initLegacyCode: function() { // All old code goes in here, no changes to see $('#toggle-post-dialog').on("click", function(e) { ... }); }.on("didInsertElement") }); The Component js/components/gf-new-post.js
72. <div class="row headline"> <div class="col-md-8 col-sm-8 col-md-offset-2"> <h1> <span>Recently Shared Gifs</span> <span id="share-section"> <div class="button-area"> <a class="btn btn-success" id="toggle-post-dialog" class="share-button"> Submit a Gif </a> </div> </span> </h1> </div> </div> <!-- Also no changes here --> The Template js/templates/components/gf-new-post.hbs
73. The Sprinkling js/components/gf-new-post.js $(document).ready(function() { $("#new-post-container").each(function(){ var component = App.GfNewPostComponent.create(); component.replaceIn(this); }); });
74. 2. Test it
75. First test jspec/components/gf-new-post_spec.coffee describe 'new post component', -> beforeEach -> @component = App.GfNewPostComponent.create().append() @component.container = App.__container__ afterEach -> @component.destroy() it "exists", -> expect(@component.get('element')).to.exist expect(@component.$('#gif-post-dialog')).to.exist $ karma run . Chrome 35.0.1887 (Mac OS X 10.8.5): Executed 1 of 1 SUCCESS (1.811 secs / 0.001 secs)
76. Hand wave alert
77. A note on JS & Ember testing
78. It’s a “wild west”.
79. Not this wild west
80. This wild west
81. If the wild west was so great, we’d still live there.
82. The testing story is starting to mature (blogs, libraries) Opportunity to make a contribution The good news
83. AJAX tests jspec/components/gf-new-post_spec.coffee beforeEach -> ic.ajax.defineFixture '/gif_posts', response: gif_post: id: "1" url: "http://blah.com/cool-gif.gif" user: username: "fakeuser" body: "thing: http://blah.com/cool-gif.gif" jqXHR: {} textStatus: 'success'
84. More tests jspec/components/gf-new-post_spec.coffee describe "clicking submit with good response", -> beforeEach -> @component.$("a.gif-submit").click() it "shows success message and adds gif", -> expect(@component.$("#gif-dialog .message")).to.be.visible expect(@component.$("#gif-dialog .message")).to.have.class "success" expect(@component.$("#gif-dialog .message").text()).to.equal "New gif posted: http://blah.com/cool-gif.gif" $ karma run ....................... Chrome 35.0.1887 (Mac OS X 10.8.5): Executed 23 of 23 SUCCESS (2.181 secs / 0.017 secs)
85. describe 'new post component', -> beforeEach -> @gifList = $('<section class="gif-list"></section>').appendTo("body"); @component = App.GfNewPostComponent.create().append() @component.container = App.__container__ afterEach -> @gifList.remove() @component.destroy() it "exists", -> expect(@component.get('element')).to.exist expect(@component.$('#gif-post-dialog')).to.exist it "doesn't show the dialog", -> expect(@component.$('#gif-post-dialog')).not.to.be.visible describe "clicking the show dialog button", -> beforeEach -> @component.$("#toggle-post-dialog").click() it "shows the dialog", -> expect(@component.$('#gif-post-dialog')).to.be.visible describe 'entering bad text into the gif box', -> beforeEach -> @component.$("textarea").val("thing: notagif.jpg") @component.$("textarea").trigger "input" it "leaves the save button disabled", -> expect(@component.$("a.gif-submit")).to.have.attr("disabled") it "counts the characters", -> expect(@component.$(".character-count-number").text()).to.equal "18" it "displays a client-side validation error", -> expect(@component.$(".message")).to.be.visible expect(@component.$(".message")).to.have.class("validation-error") expect(@component.$(".message").text()).to.match /no valid gif/ it "does not display a preview section", -> expect(@component.$(".gif-preview")).not.to.exist describe 'putting too much text in the box', -> beforeEach -> @component.$("textarea").val("thing: http://blah.com/cool-gif.gif") @component.$("textarea").trigger "input" @component.$("textarea").val("thing: http://blah.com/cool-gif.gif This is a thing which is pretty cool except the text is too long. Maybe this is going to display a nice error message for people to enjoy") @component.$("textarea").trigger "input" it "disables the save button", -> expect(@component.$("a.gif-submit")).to.have.attr("disabled") it "counts the characters", -> expect(@component.$(".character-count-number").text()).to.equal "145" it "displays a client-side validation error", -> expect(@component.$(".message")).to.be.visible expect(@component.$(".message")).to.have.class("validation-error") expect(@component.$(".message").text()).to.match /too long/ it "continues to display a preview section", -> expect(@component.$(".gif-preview")).to.exist describe 'entering good text into the gif box', -> beforeEach -> @component.$("textarea").val("thing: http://blah.com/cool-gif.gif") @component.$("textarea").trigger "input" it "enables the save button", -> expect(@component.$("a.gif-submit")).not.to.have.attr("disabled") it "counts characters, minus the gif input", -> expect(@component.$(".character-count-number").text()).to.equal "7" it "does not display an error message", -> expect(@component.$(".message")).not.to.be.visible expect(@component.$(".message")).not.to.have.class("validation-error") expect(@component.$(".message").text()).to.be.empty it "displays a preview image", -> expect(@component.$(".gif-preview")).to.exist expect(@component.$(".gif-preview img").attr("src")).to.equal "http://blah.com/cool-gif.gif" describe "clicking submit with good response", -> beforeEach -> @clock = sinon.useFakeTimers() @component.$("a.gif-submit").attr("href", "/gif_posts").click(); ic.ajax.defineFixture '/gif_posts', response: gif_post: id: "1" url: "http://blah.com/cool-gif.gif" user: username: "fakeuser" body: "thing: http://blah.com/cool-gif.gif" jqXHR: {} textStatus: 'success' @component.$("a.gif-submit").click(); afterEach -> @clock.restore() it "shows success message and adds gif", -> expect(@component.$("#gif-post-dialog .message")).to.be.visible expect(@component.$("#gif-post-dialog .message")).to.have.class "success" expect(@component.$("#gif-post-dialog .message").text()).to.equal "New gif posted: http://blah.com/cool-gif.gif" newGif = $("section.gif-list article.gif-entry") expect($(newGif[0]).find(".gif-entry-user").text()).to.equal "Shared by fakeuser" describe "after 5 seconds", -> beforeEach -> @clock.tick(5010) it "resets to initial state", -> expect(@component.$("#gif-post-dialog .message")).not.to.be.visible expect(@component.$("#gif-post-dialog .message")).not.to.have.class "success" expect(@component.$("#gif-post-dialog .message").text()).to.equal "" describe "deleting the gif with success response", -> beforeEach -> ic.ajax.defineFixture '/gif_posts/1', response: "yay" jqXHR: {} textStatus: 'success' sinon.stub(window, "confirm").returns(true) @newGif = $("section.gif-list article.gif-entry") @deleteButton = $(@newGif).find(".gif-entry-delete [data-gif-delete]") $(@deleteButton).trigger("click") afterEach -> window.confirm.restore() it "removes the gif", -> expect($("section.gif-list article.gif-entry")).not.to.exist describe "clicking submit with validation error", -> beforeEach -> @clock = sinon.useFakeTimers() @component.$("a.gif-submit").attr("href", "/gif_posts").click(); ic.ajax.defineFixture '/gif_posts', responseText: "Validation fail" responseJSON: errors: url: ["LOL NOPE VALIDATION FAILZ"] jqXHR: {} textStatus: 'unprocessable entity' @component.$("a.gif-submit").click(); it "shows an error message", -> expect(@component.$("#gif-post-dialog .message")).not.to.have.class "success" expect(@component.$("#gif-post-dialog .message")).to.have.class "error" expect(@component.$("#gif-post-dialog .message").text()).to.equal "LOL NOPE VALIDATION FAILZ" describe "after 5 seconds", -> beforeEach -> @clock.tick(5010) afterEach -> @clock.restore() it "resets to initial state", -> expect(@component.$("#gif-post-dialog .message")).not.to.be.visible expect(@component.$("#gif-post-dialog .message")).not.to.have.class "error" expect(@component.$("#gif-post-dialog .message").text()).to.equal "" describe "clicking submit with bad response", -> beforeEach -> @component.$("a.gif-submit").attr("href", "/gif_posts").click(); ic.ajax.defineFixture '/gif_posts', response: "BARF" @component.$("a.gif-submit").click(); it "shows an error message", -> expect(@component.$("#gif-post-dialog .message")).not.to.have.class "success" expect(@component.$("#gif-post-dialog .message")).to.have.class "error" expect(@component.$("#gif-post-dialog .message").text()).to.match /error posting/ describe "clicking cancel", -> beforeEach -> @component.$("#gif-post-dialog a.cancel-post").click() it "closes the dialog", -> expect(@component.$('#gif-post-dialog')).not.to.be.visible it "clears the text input", -> expect(@component.$('textarea').val()).to.equal "" Fully tested jspec/components/gf-new-post_spec.coffee
86. Go ahead, take a victory lap
87. 3. Identify Models *May or may not match server MVC models
88. $ karma run Chrome 35.0.1887 (Mac OS X 10.8.5) GifPost with a valid url parses the url from the body FAILED AssertionError: expected undefined to equal 'http://blah.com/cool-gif.gif' Unit tests! jspec/models/gif-post_spec.coffee describe "GifPost", -> beforeEach -> @gifPost = App.GifPost.create() describe "with a valid url", -> beforeEach -> fillIn "textarea#new-gif-body", "thing: http://blah.com/cool-gif.gif" it "parses the url from the body", -> expect(@gifPost.get("parsedUrl")).to.equal "http://blah.com/cool-gif.gif"
89. Extract to model App.GifPost = Ember.Object.extend({ regex: gifRegex(), body: "", parsedUrl: function() { var matches = this.get("body").match(this.get("regex")) return (matches && matches.length > 0) ? matches[0] : ""; }.property("body"), }); $ karma run .............................. Chrome 35.0.1887 (Mac OS X 10.8.5): Executed 30 of 29 SUCCESS (2.181 secs / 0.017 secs) js/models/gif-post.js
90. Add Handlebars <div id="gif-post-dialog"> <div class="gif-input-container"> {{textarea name="new-gif-post" class= "new-gif-input" value=gifPost.body}} </div> <a {{action "submit"}} class="btn btn-primary gif-submit"> Post </a> <p class="character-count">{{gifPost.charCount}}</p> </div> js/templates/components/gf-new-post.hbs
91. Adiós garbage! $('#new-gif-body').on("input propertychange", function(e) { var regex = gifRegex(); var parsedUrl = $(this).val().match(regex); var isGif = !!parsedUrl ? /.gif$/.test(parsedUrl) : null; var charCount if (!!isGif) { charCount = ($(this).val().length - parsedUrl[0].length) if (charCount <= 140) { ... } else { charCount = $(this).val().length ... } $(".character-count-number").text(charCount); }); js/components/gf-new-post.js
92. Let the framework carry the load
93. 4. Identify States
94. State 1: initial
95. State 2: editing
96. State 3: loading
97. State 4: error
98. State 5: success
99. Identify states js/components/gf-new-post.js App.GfNewPostComponent = Ember.Component.extend({ ... classNameBindings: ["formState"], formState: "initial", // FORM-STATES: "initial", "editing", "loading", "failure", "success" ...
100. - NO TOUCHING THE DOM!
101. Change states js/components/gf-new-post.js showDialog: function() { this.set("formState", "editing"); }, cancel: function() { this.set("formState", "initial"); this.set("gifPost", App.GifPost.create()); }, submit: function() { this.set("formState", "loading"); this.get("gifPost").save(); }
102. 4. Break it up
103. What’s left? js/components/gf-new-post.js initLegacyCode: function() { $('section.gif-list').on("click", "article a[data-gif-delete]", function(e) { e.preventDefault(); var url = $(this).attr('href'); var id = $(this).data('gifPostId'); if(confirm('Are you sure you want to delete this post?')){ ic.ajax({type: "DELETE", dataType: "json", url: url }).then(function(data) { $('section.gif-list article[data-gif-post-id=' + id.toString() + ']').remove(); }); } }); }.on("didInsertElement"),
104. What’s left? js/components/gf-new-post.js var newArticle = '<article class="gif-entry" data-gif-entry data-gif-post-id="' + gifPost.get("id") + '"><div class="gif-entry-image"><img class="framed" src="' + gifPost.get("parsedUrl") + '"></div><div class="gif-entry-body">' + gifPost.get("body") + '</div><div class="gif-entry-delete"><a class="btn btn- danger"data-gif-delete data-gif-post-id="' + gifPost.get("id") + '" href="/ gif_posts/' + gifPost.get("id") + '" rel="nofollow">Delete</a></div><div class="gif- entry-user">Shared by ' + gifPost.get("username") + '</div><div class="gif-entry- permalink"><a href="/gif_posts/' + gifPost.get("id") + '">Permalink</a></div><div style="clear:both;"></div></article>'; $('section.gif-list').prepend(newArticle);
105. The call() is coming var newArticle = '<article class="gif-entry" data-gif-entry data-gif-post-id="' + gifPost.get("id") + '"><div class="gif-entry-image"><img class="framed" src="' + gifPost.get("parsedUrl") + '"></div><div class="gif-entry-body">' + gifPost.get("body") + '</div><div class="gif-entry-delete"><a class="btn btn- danger"data-gif-delete data-gif-post-id="' + gifPost.get("id") + '" href="/ gif_posts/' + gifPost.get("id") + '" rel="nofollow">Delete</a></div><div class="gif- entry-user">Shared by ' + gifPost.get("username") + '</div><div class="gif-entry- permalink"><a href="/gif_posts/' + gifPost.get("id") + '">Permalink</a></div><div style="clear:both;"></div></article>'; $('section.gif-list').prepend(newArticle); From inside the codebase
106. Time for a 2nd component Manage post list Handle delete Final nail in coffin for direct DOM manipulation
107. Makes AJAX requests & maps to model for you This actually buys us time Detour: Ember Data
108. Ember Data js/models/gif-post.js App.GifPost = DS.Model.extend({ /* PROPERTIES */ regex: gifRegex(), body: DS.attr("string"), url: DS.attr("string"), username: DS.attr("string"), ...
109. js/store.js // Overwrite ajax to be able to use nice ic-ajax fixtures App.ApplicationAdapter = DS.ActiveModelAdapter.extend({ ajax: function(url, type, options) { options = this.ajaxOptions(url, type, options); return ic.ajax(options); } }); Ember Data
110. 2nd Component js/components/gf-list-posts.js App.GfListPostsComponent = Ember.Component.extend({ layoutName: "components/gf-list-posts", gifPosts: null, actions: { delete: function(gifPost) { if (confirm("Really delete this lovely gif?")) { gifPost.destroyRecord().then(function(result){ //message }, function(){ gifPost.rollback(); }); } } } });
111. 2nd Test Set jspec/components/gf-list-posts_spec.js describe "list posts component", -> beforeEach -> // fixture goes here @component = App.GfListPostsComponent.create container: App.__container__ @component.appendTo("body") App.store.find("gifPost").then (result) => @component.set "gifPosts", result afterEach -> @component.destroy() it "exists", -> expect(@component.get('element')).to.exist it "lists the gifs", -> expect(@component.$("article.gif-entry:first .gif-entry- user").text().trim()).to.equal "Shared by tehviking"
112. 2nd Template js/templates/components/gf-list-posts.js {{#each gifPosts}} <article class="gif-entry"> <div class="gif-entry-image"> <img class="framed" {{bind-attr src=.parsedUrl}}> </div> <div class="gif-entry-body">{{body}}</div> <div class="gif-entry-delete"> <a class="btn btn-danger" {{action "delete" gifPost}}>Delete</a> </div> <div class="gif-entry-user">Shared by {{username}}</div> </article> {{/each}}
113. 2nd Sprinkle js/templates/components/gf-list-posts.js $(document).ready(function() { if ($("#gif-posts-container").length) { App.store.find("gifPost").then(function(result) { $("#gif-posts-container").each(function(){ var component = App.GfListPostsComponent.create({ gifPosts: result }); component.replaceIn(this); }); }); } });
114. 2 components, shared data Both react to data changes DOM auto-updates in both
116. We already bound state to a CSS class Let CSS transitions do the work CSS Animation
117. CSS Animation js/templates/components/gf-list-posts.js .new-post-component { &.initial { } &.editing { } &.loading { } &.failure { } &.success { } &.is-invalid { } }
118. CSS Animation stylesheets/gf-list-posts.scss .new-post-component { &.initial { .share-dialog-container { height: 0px; opacity: 0; } } .share-dialog-container { opacity: 1; height: 160px; -webkit-transition-property: height, opacity; transition-property: height, opacity; -webkit-transition-duration: 300ms, 200ms; transition-duration: 300ms, 200ms; } }
119. DEMO
120. No direct DOM manipulation
121. data: { gif_post: { body: body, url: parsedUrl[0], } } }).done(function(data) { var post = data.gif_post; var url = post.url || ""; var username = (!!post.user && !!post.user.username) ? post.user.username : ""; var body = post.body || null; $('#gif-post-dialog .message').removeClass("error").text(""); $('.share-gif-form').hide('fade'); $("#gif-post-dialog .character-count-number").text("0"); $('#gif-post-dialog .message').show().addClass("success").text("New gif posted: " + post.url); var newArticle = '<article class="gif-entry" data-gif-entry data-gif-post-id="' + post.id + '"><div class="gif-entry-image"><img lass="framed" src="' + url + '"></div><div class="gif-entry-body">' + body + '</div><div class="gif-entry-delete"><a class="btn btn- anger"data-gif-delete data-gif-post-id="' + post.id + '" href="/gif_posts/' + post.id + '" rel="nofollow">Delete</a></div><div class=" ntry-user">Shared by ' + username + '</div><div class="gif-entry-permalink"><a href="/gif_posts/' + post.id + '">Permalink</a></div><d tyle="clear:both;"></div></article>'; $('section.gif-list').prepend(newArticle); setTimeout(function() { $('#share-section .button-area').show('fade'); $('#gif-post-dialog .message').hide().text(""); $('#gif-post-dialog .gif-preview').remove() $('#gif-post-dialog').hide('blind'); $('.share-gif-form').show(); }, 5000); }).fail(function(data) { if (!data.responseText) { $('#gif-post-dialog .message').show().addClass("error").text("There was an error posting your gif. Please wait and try again.") } else { $('#gif-post-dialog .message').show().addClass("error").text(data.responseJSON.errors.url[0]); } setTimeout(function() { $('#gif-post-dialog .message').removeClass("error").hide(); $("#gif-post-dialog a.gif-submit").removeAttr("disabled"); }, 5000);
122. Introducing: 512-bit jQCS encryption
123. data: { gif_post: { body: body, url: parsedUrl[0], } } }).done(function(data) { var post = data.gif_post; var url = post.url || ""; var username = (!!post.user && !!post.user.username) ? post.user.username : ""; var body = post.body || null; $('#gif-post-dialog .message').removeClass("error").text(""); $('.share-gif-form').hide('fade'); $("#gif-post-dialog .character-count-number").text("0"); $('#gif-post-dialog .message').show().addClass("success").text("New gif posted: " + post.url); var newArticle = '<article class="gif-entry" data-gif-entry data-gif-post-id="' + post.id + '"><div class="gif-entry-image"><img lass="framed" src="' + url + '"></div><div class="gif-entry-body">' + body + '</div><div class="gif-entry-delete"><a class="btn btn- anger"data-gif-delete data-gif-post-id="' + post.id + '" href="/gif_posts/' + post.id + '" rel="nofollow">Delete</a></div><div class=" ntry-user">Shared by ' + username + '</div><div class="gif-entry-permalink"><a href="/gif_posts/' + post.id + '">Permalink</a></div><d tyle="clear:both;"></div></article>'; $('section.gif-list').prepend(newArticle); setTimeout(function() { $('#share-section .button-area').show('fade'); $('#gif-post-dialog .message').hide().text(""); $('#gif-post-dialog .gif-preview').remove() $('#gif-post-dialog').hide('blind'); $('.share-gif-form').show(); }, 5000); }).fail(function(data) { if (!data.responseText) { $('#gif-post-dialog .message').show().addClass("error").text("There was an error posting your gif. Please wait and try again.") } else { $('#gif-post-dialog .message').show().addClass("error").text(data.responseJSON.errors.url[0]); } setTimeout(function() { $('#gif-post-dialog .message').removeClass("error").hide(); $("#gif-post-dialog a.gif-submit").removeAttr("disabled"); }, 5000); Now that’s Cloudgineering™
124. // This computes the displayed message for all success/failure message: function(){ var formState = this.get("formState") // On failure, delegate message to the object if (formState === "failure") { return this.get("gifPost.message"); // On success, just scream real loud! } else if (formState === "success") { return "New gif posted: " + this.get("gifPost.parsedUrl") // If it's invalid but has a gif, it's too long: } else if (this.get("isInvalid") && !!this.get("gifPost.isGif")) { return "Your message is too long."; // Otherwise if it's not valid it's not a gif } else if (this.get("isInvalid")) { return "Please add a valid gif link to this post."; } else { return null; } }.property("formState", "isInvalid", "gifPost.isGif", "gifPost.message"), /* ACTIONS */ // These actions are primarily about pushing state around. actions: { showDialog: function() { this.set("formState", "editing"); }, cancel: function() { this.set("formState", "initial"); this.set("gifPost", App.store.createRecord("gifPost")); }, submit: function() { controller = this; controller.set("formState", "loading"); var gifPost = this.get("gifPost"); gifPost.save().then(function(data) { // Success controller.set("formState", "success"); controller.defer(function() { after
125. $(document).ready(function(){ $('#toggle-post-dialog').on("click", function(e) { e.preventDefault(); $("#new-gif-body").val(""); $('#share-section .button-area').hide('fade'); $('#gif-post-dialog').show('blind'); $("#gif-post-dialog a.gif-submit").attr("disabled", "disabled"); }); $('#gif-post-dialog').on("click", 'a.cancel-post', function(e) { e.preventDefault(); $('#share-section .button-area').show('fade'); $("#new-gif-body").val(""); $('#gif-post-dialog').hide('blind'); }); $('#new-gif-body').on("input propertychange", function(e) { var parsedUrl = $(this).val().match(/https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,4}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/); var isGif = !!parsedUrl ? /.gif$/.test(parsedUrl) : null; var charCount if (!!isGif) { charCount = ($(this).val().length - parsedUrl[0].length) if (charCount <= 140) { $("#gif-post-dialog a.gif-submit").removeAttr("disabled"); $('#gif-post-dialog .message').text("").removeClass("error").hide(); $('#gif-post-dialog .gif-preview-container').html('<div class="gif-preview"><img src="' + parsedUrl[0] + '" width="90"></div>') } else { $('#gif-post-dialog .message').show().addClass("validation-error").text("Your message is too long."); $("#gif-post-dialog a.gif-submit").attr("disabled", "disabled"); } } else { charCount = $(this).val().length $('#gif-post-dialog .message').show().addClass("validation-error").text("There is no valid gif link in this post.") $('#gif-post-dialog .gif-preview').remove() $("#gif-post-dialog a.gif-submit").attr("disabled", "disabled"); } $("#gif-post-dialog .character-count-number").text(charCount); }); $('section.gif-list').on("click", "article a[data-gif-delete]", function(e) { e.preventDefault(); console.log(e); var url = $(this).attr('href'); var id = $(this).data('gifPostId'); if(confirm('Are you sure you want to delete this post?')){ $.ajax({ type: "DELETE", dataType: "json", url: url }).done(function(data) { $('section.gif-list article[data-gif-post-id=' + id.toString() + ']').remove(); }); } }); $('#gif-post-dialog').on("click", 'a.gif-submit', function(e) { e.preventDefault(); var currentUserId = $('meta[name="current-user-id"]').attr("content"); $(this).attr("disabled", "disabled"); var url = $(this).attr('href'); var body = $("#new-gif-body").val(); var parsedUrl = body.match(/https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,4}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/); $.ajax({ type: "POST", dataType: "json", url: url, data: { gif_post: { body: body, url: parsedUrl[0], } } }).done(function(data) { var post = data.gif_post; var url = post.url || ""; var username = (!!post.user && !!post.user.username) ? post.user.username : ""; var body = post.body || null; $('#gif-post-dialog .message').removeClass("error").text(""); $('.share-gif-form').hide('fade'); $("#gif-post-dialog .character-count-number").text("0"); $('#gif-post-dialog .message').show().addClass("success").text("New gif posted: " + post.url); var newArticle = '<article class="gif-entry" data-gif-entry data-gif-post-id="' + post.id + '"><div class="gif-entry-image"><img class="framed" src="' + url + '"></div><div class="gif-entry-body">' + body + '</div><div class="gif-entry-delete"><a class="btn btn-danger"data-gif-delete data-gif-post-id="' + post.id + '" href="/ gif_posts/' + post.id + '" rel="nofollow">Delete</a></div><div class="gif-entry-user">Shared by ' + username + '</div><div class="gif-entry-permalink"><a href="/gif_posts/' + post.id + '">Permalink</a></div><div style="clear:both;"></div></article>'; $('section.gif-list').prepend(newArticle); setTimeout(function() { $('#share-section .button-area').show('fade'); $('#gif-post-dialog .message').hide().text(""); $('#gif-post-dialog .gif-preview').remove() $('#gif-post-dialog').hide('blind'); $('.share-gif-form').show(); }, 5000); }).fail(function(data) { if (!data.responseText) { $('#gif-post-dialog .message').show().addClass("error").text("There was an error posting your gif. Please wait and try again."); } else { $('#gif-post-dialog .message').show().addClass("error").text(data.responseJSON.errors.url[0]); } setTimeout(function() { $('#gif-post-dialog .message').removeClass("error").hide(); $("#gif-post-dialog a.gif-submit").removeAttr("disabled"); }, 5000); }); }); }); before
126. App.GfNewPostComponent = Ember.Component.extend({ /* PROPERTIES */ layoutName: "components/gf-new-post", gifPost: null, classNames: ["new-post-component"], classNameBindings: ["formState", "isInvalid"], formState: "initial", // FORM-STATES: "initial", "editing", "loading", "failure", "success" isValid: Ember.computed.alias("gifPost.isValid"), isInvalid: Ember.computed.not("isValid"), /* OBSERVERS */ // This computes the displayed message for all success/failure message: function(){ var formState = this.get("formState") // On failure, delegate message to the object if (formState === "failure") { return this.get("gifPost.message"); // On success, just scream real loud! } else if (formState === "success") { return "New gif posted: " + this.get("gifPost.parsedUrl") // If it's invalid but has a gif, it's too long: } else if (this.get("isInvalid") && !!this.get("gifPost.isGif")) { return "Your message is too long."; // Otherwise if it's not valid it's not a gif } else if (this.get("isInvalid")) { return "Please add a valid gif link to this post."; } else { return null; } }.property("formState", "isInvalid", "gifPost.isGif", "gifPost.message"), /* ACTIONS */ // These actions are primarily about pushing state around. actions: { showDialog: function() { this.set("formState", "editing"); }, cancel: function() { this.set("formState", "initial"); this.set("gifPost", App.store.createRecord("gifPost")); }, submit: function() { controller = this; controller.set("formState", "loading"); var gifPost = this.get("gifPost"); gifPost.save().then(function(data) { // Success controller.set("formState", "success"); controller.defer(function() { controller.set("formState", "initial") }, 5000); // Failure }, function(data) { controller.set("formState", "failure"); if (!!data.jqXHR && data.jqXHR.status == 422) { // 422: validation error controller.get("gifPost").set("message", data.jqXHR.responseJSON.errors.url[0]); } else { controller.get("gifPost").set("message", "There was an error posting your gif. Please wait and try again.") } controller.defer(function() { controller.set("formState", "editing") }, 5000); }); } }, /* FUNCTIONS */ // Allow injectable setTimeout override for testing defer: function(callback, delay) { setTimeout(callback, delay); } }); /* INITIALIZATION */ $(document).ready(function() { $("#new-post-container").each(function(){ var component = App.GfNewPostComponent.create({ gifPost: App.store.createRecord("gifPost") }); component.replaceIn(this); }); }); App.GfListPostsComponent = Ember.Component.extend({ /* PROPERTIES */ layoutName: "components/gf-list-posts", gifPosts: null, classNames: ["list-posts-component"], // We only want to show posts that are saved to the server persistedGifPosts: Ember.computed.filterBy("gifPosts", "isNew", false), sortedPosts: function() { // well this is a neat trick, sort in reverse ID order return this.get("persistedGifPosts").sortBy("id:desc"); }.property("persistedGifPosts.@each"), /* ACTIONS */ actions: { delete: function(gifPost) { if (confirm("Really delete this lovely gif?")) { gifPost.destroyRecord().then(function(result){ //message? }, function(){ gifPost.rollback(); }); } } } }); /* INITIALIZATION */ $(document).ready(function() { if ($("#gif-posts-container").length) { App.store.find("gifPost").then(function(result) { $("#gif-posts-container").each(function(){ var component = App.GfListPostsComponent.create({ gifPosts: result }); component.replaceIn(this); }); }); } }); App.GifPost = DS.Model.extend({ /* PROPERTIES */ body: DS.attr("string"), url: DS.attr("string"), username: DS.attr("string"), message: null, parsedUrl: function() { if (!!this.get("body")) { var matches = this.get("body").match(this.get("regex")) return (matches && matches.length > 0) ? matches[0] : ""; } }.property("body"), isGif: function() { return /.gif$/.test(this.get("parsedUrl")) }.property("parsedUrl"), charCount: function() { if (this.get("isGif")) { return this.get("body.length") - this.get("parsedUrl.length") } else { return this.get("body.length") } }.property("body", "parsedUrl", "isGif"), isValid: function() { return !!(this.get("charCount") <= 140 && this.get("isGif")) }.property("charCount", "isGif"), permalink: function() { return "/gif_posts/" + this.get("id"); }.property("id"), /* OBSERVERS */ // Copy the computed parsedUrl into the canonical url to send to the server setUrl: function() { this.set("url", this.get("parsedUrl")); }.observes("parsedUrl"), /* MISC */ // This property is at the end basically because it breaks Emacs auto-indent :/ regex: function() { return /https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,4}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/ }.property() }); after
127. Where can you go from here? Just a couple steps from going full SPA Or keep series of components that share model data
128. Why did we do all this? It was a sizable amount of work What even is my life
129. How’s it coming? Once you finish that Like button, we can IPO and be millionaires!
130. Oh yeah Want users to have great stuff Want to add value Want to enjoy working in our code
131. Devs just wanna have fun
132. “Fav” Feature jspec/components/gf-list-posts_spec.coffee describe "favoriting a post", -> beforeEach -> // Stub fixture data here @entry = @component.$("article.gif-entry:first") click $(@entry).find(".gif-entry-fav-link") it "favorites the post", -> expect($("article.gif-entry i.fav-star")).to.have.class "is-favorited" it "lists the favorite count", -> expect($("article.gif-entry .gif-entry-fav-count").text().trim()).to.equal "1"
133. “Fav” Feature js/models/favorite.js App.Favorite = DS.Model.extend({ userId: DS.attr("number"), gifPost: DS.belongsTo("gifPost") });
134. “Fav” Feature js/components/gf-list-posts.js <div class="gif-entry-fav"> <span class="gif-entry-fav-count"> {{favorites.length}} </span> <a class="gif-entry-fav-link" {{action "toggleFav" this}}> <i {{bind-attr class="isFavorited :fav-star"}}></i> </a> </div>
135. “Fav” Feature js/components/gf-list-posts.js toggleFav: function(gifPost) { if (gifPost.get("isFavorited")) { var favId = gifPost.get("currentUserFavoriteId") App.store.find("favorite", favId).then(function(result){ result.destroyRecord(); }); } else { fav = App.store.createRecord("favorite", { gifPost: gifPost }); fav.save().then(function(result){ // handle success }, function(){ //handle failure fav.rollback(); }); }
136. DEMO
137. Fun to extend More filters Popular posts Sharing
138. My conference story
139. I want to hug every dev. Come say hi
140. Thank you so much. Brandon Hays @tehviking http://frontside.io
141. Image credits http://www.flickr.com/photos/davidyuweb/9369008677/ http://www.flickr.com/photos/elescir/9833284434/ http://www.flickr.com/photos/derekskey/5249580870/ http://www.flickr.com/photos/111692634@N04/11407095913/ http://www.flickr.com/photos/armandolobos/9360963587/ http://upload.wikimedia.org/wikipedia/commons/9/9e/ Rainstorm_over_Salt_Lake_City.jpg http://en.wikipedia.org/wiki/File:Sketch_of_Salt_Lake_1860.jpg http://www.flickr.com/photos/mommypants/3738076382 http://www.flickr.com/photos/moontorch/9909941394/ http://www.flickr.com/photos/cbnsp/6605969807/ http://www.flickr.com/photos/33216291@N08/4152110541 http://www.flickr.com/photos/schnappischnap/8969004201 http://www.flickr.com/photos/intelfreepress/8294794328/ http://www.flickr.com/photos/gsfc/6385412459/ http://www.flickr.com/photos/uhdigital/8135187152/ http://www.flickr.com/photos/perfectance/6965568618/ http://www.flickr.com/photos/111692634@N04/11406975556/