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Building Evented Single Page Applications
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John Nunemaker
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September 13, 2009
Programming
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Building Evented Single Page Applications
Given at jQuery conf in Boston.
John Nunemaker
PRO
September 13, 2009
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Transcript
building evented single-page applications Sunday, September 13, 2009
1. who 2. why 3. demo 4. how Sunday, September
13, 2009
1. who Sunday, September 13, 2009
chancellor http://orderedlist.com/ Sunday, September 13, 2009
professor http://teaching.johnnunemaker.com/ Sunday, September 13, 2009
rubyist http://railstips.org/ Sunday, September 13, 2009
i’m not perfect Sunday, September 13, 2009
2. why Sunday, September 13, 2009
because? Sunday, September 13, 2009
because? Sunday, September 13, 2009
speed only send what changes across the wire Sunday, September
13, 2009
perceived speed Sunday, September 13, 2009
interactivity Sunday, September 13, 2009
experience but the greatest of these is... Sunday, September 13,
2009
3. demo Sunday, September 13, 2009
http://peoplebase.com/ http://harmonyapp.com/ Sunday, September 13, 2009
4. how Sunday, September 13, 2009
goals Sunday, September 13, 2009
no reloads Sunday, September 13, 2009
no reloads history/refresh Sunday, September 13, 2009
no reloads history/refresh easy Sunday, September 13, 2009
# Sunday, September 13, 2009
no reloads history/refresh easy Sunday, September 13, 2009
no reloads history/refresh easy Sunday, September 13, 2009
no reloads history/refresh easy Sunday, September 13, 2009
no reloads history/refresh easy Sunday, September 13, 2009
the end Sunday, September 13, 2009
no reloads Sunday, September 13, 2009
<a href="#/items">Items</a> Sunday, September 13, 2009
$("a[href^='#/']").live('click', function (event) { var $link = $(this); window.location.hash =
$link.attr('href'); $(document).trigger('hashchange'); return false; }); Sunday, September 13, 2009
$(document).bind('hashchange', Layout.reload); Sunday, September 13, 2009
var Layout = { reload: function() { Layout.load(window.location.hash); } };
Sunday, September 13, 2009
var Layout = { load: function(path, options) { path =
path.replace(/^#/, ''); // trigger path loading events $.ajax({ url : path, dataType : 'json', success : function(json) { Layout.onSuccess(json); // trigger path success events if (options && options.success) { options.success(); } }, complete : function() { if (options && options.complete) { options.complete(); } } }); } }; Sunday, September 13, 2009
var Layout = { load: function(path, options) { path =
path.replace(/^#/, ''); $(document).trigger('path:loading', [path]); $(document).trigger('path:loading:' + path); $.ajax({ url: path, dataType: 'json', success: function(json) { Layout.onSuccess(json); $(document).trigger('path:success', [path, json]); $(document).trigger('path:success:' + path, [json]); if (options && options.success) { options.success(); } }, complete: function() { if (options && options.complete) { options.complete(); } } }); } }; Sunday, September 13, 2009
var Layout = { onSuccess: function(json) { Layout.applyJSON(json); // trigger
layout success }, }; Sunday, September 13, 2009
no reloads Sunday, September 13, 2009
history/refresh Sunday, September 13, 2009
setInterval(function() { var hash_is_new = window.location.hash && window.currentHash != window.location.hash;
if (hash_is_new) { window.currentHash = window.location.hash; Layout.handlePageLoad(); } }, 300); Sunday, September 13, 2009
#/org/groups/12/45/new Sunday, September 13, 2009
org groups 12 45 new Sunday, September 13, 2009
org groups 12 45 new Sunday, September 13, 2009
org groups 12 45 new Sunday, September 13, 2009
org groups 12 45 new Sunday, September 13, 2009
org groups 12 45 new Sunday, September 13, 2009
org groups 12 45 new Sunday, September 13, 2009
var Layout = { handlePageLoad: function() { var segments =
window.location.hash.replace(/^#\//, '').split('/'), total = segments.length, path = ''; function loadSectionsInOrder() { var segment = segments.shift(); path += '/' + segment; var onComplete = function() { var loaded = total - segments.length, finished = loaded == total; if (!finished) { loadSectionsInOrder(); } }; Layout.load(path, {complete: onComplete}); } loadSectionsInOrder(); } }; Sunday, September 13, 2009
var Layout = { handlePageLoad: function() { var segments =
window.location.hash.replace(/^#\//, '').split('/'), total = segments.length, path = ''; $(document).trigger('page:loading'); function loadSectionsInOrder() { var segment = segments.shift(); path += '/' + segment; var onComplete = function() { var loaded = total - segments.length, finished = loaded == total; $(document).trigger('page:progress', [total, loaded]); if (finished) { $(document).trigger('page:loaded'); } else { loadSectionsInOrder(); } }; Layout.load(path, {complete: onComplete}); } loadSectionsInOrder(); } }; Sunday, September 13, 2009
$(document).bind('page:progress', function(e, total, loaded) { if (total != loaded) {
var final_width = 114, new_width = (loaded/total) * final_width; $('#loading_progress').animate({width: new_width+'px'}, 200); } }); $(document).bind('page:loading', function() { $('#harmony_loading').show(); $('#loading_progress').css('width', 0); }); $(document).bind('page:loaded', function() { $('#loading_progress').animate({width:'114px'}, 300, 'linear', function() { $('#harmony_loading').hide(); }); }); Sunday, September 13, 2009
history/refresh Sunday, September 13, 2009
easy Sunday, September 13, 2009
rule #1: abuse events for better code separation and easier
customization http://orderedlist.com/articles/jquery-evented-programming-primer Sunday, September 13, 2009
$('form').live('submit', function(event) { var $form = $(this); $form.ajaxSubmit({ dataType: 'json',
beforeSend: function() { // trigger before send }, success: function(json) { // if errors, show them, else apply json and reset form }, error: function(response, status, error) { // trigger error }, complete: function() { // trigger complete } }); return false; }); Sunday, September 13, 2009
$('form').live('submit', function(event) { var $form = $(this); $form.ajaxSubmit({ dataType: 'json',
beforeSend: function() { $form.trigger('form:beforeSend'); }, success: function(json) { if (json.errors) { $form.showErrors(json.errors); } else { Layout.onSuccess(json); $form.trigger('form:success', [json]); $form.resetForm(); } }, error: function(response, status, error) { $form.trigger('form:error', [response, status, error]); }, complete: function() { $form.trigger('form:complete'); } }); return false; }); Sunday, September 13, 2009
var Site = { onCreateSuccess: function(event, json) { Sidebar.highlight($('#site_' +
json.id)) Layout.updateHashWithoutLoad(window.location.hash.replace(/new$/, json.id)); }, onUpdateSuccess: function(event, json) { Sidebar.highlight($('#site_' + json.id)) } }; $('form.new_site').live('form:success', Site.onCreateSuccess); $('form.edit_site').live('form:success', Site.onUpdateSuccess); Sunday, September 13, 2009
var Field = { onCreateSuccess: function(event, json) { $('#list_section_' +
json.section_id) .addSectionField(json.field_title.toLowerCase()); }, onUpdateSuccess: function(event, json) { $('#list_section_' + json.section_id) .removeSectionField(json.old_title.toLowerCase()) .addSectionField(json.new_title.toLowerCase()); } }; $('form.new_field') .live('form:success', Field.onCreateSuccess); $('form.edit_field').live('form:success', Field.onUpdateSuccess); Sunday, September 13, 2009
Layout.applyJSON accepts json like below and “applies” it to the
layout; gets called with each url load either from click or form Sunday, September 13, 2009
Layout.applyJSON { 'replace': { '#content': '<h1>Heading</h1><p>Yay!</p>' }, 'replaceWith': { '#post_12':
'<div class="post">...</div>' }, 'remove': ['#post_11', '#comment_12'] } Sunday, September 13, 2009
rule #2: the url dictates everything Sunday, September 13, 2009
var Layout = { livePath: function(event, path, callback) { if
(typeof(test) === 'string') { $(document).bind('path:' + event + ':' + path, callback); } else { Layout.live_path_regex[event].push([path, callback]); } } }; Sunday, September 13, 2009
Layout.livePath('loading', /\/org\/([^\/]+)([0-9\/]+).*/, Groups.loading); Layout.livePath('loading', /\/sections\/([0-9]+)$/, Sections.markCurrent); Layout.livePath('success', '/org/groups', Groups.setup); Layout.livePath('success',
'/sections', Sections.makeSortable); Layout.livePath('success', /\/admin\/assets(.*)/, Assets.init); Layout.livePath('success', /\/admin\/items\/(\d+)/, ItemForm.init); Layout.livePath('success', /\/admin\/items\/([0-9\/]+)/, Items.manageSidebar); Sunday, September 13, 2009
rule #3: do it live Sunday, September 13, 2009
$('a.field_form_toggler') .live('click', Fields.toggleAddFieldForm); $('form.new_section') .live('form:success', SectionForm.onCreateSuccess); $('form.edit_section') .live('form:success', SectionForm.onUpdateSuccess); $('form.new_field')
.live('form:success', Field.onCreateSuccess); $('form.edit_field') .live('form:success', Field.onUpdateSuccess); $('a.field_destroy') .live('destroy:success', Field.onDestroySuccess); Sunday, September 13, 2009
easy Sunday, September 13, 2009