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commondream
@
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commondream
http:// .net
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commondream
http://github.com/
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A Brief History of
Handlebars.js
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http://mustache.github.com
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Logic-less Templates
Well, not really logic-less, but more like implicit logic.
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{{header}}
{{#items}} {{#first}}Slide 11
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No Backtracking
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{{header}}
{{#items}} {{#first}}Slide 15
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No Globals
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One Magical Tweet...
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One Magical Tweet...
Yo, yo... anyone want to work on an
improving mustache.js with me?
Let’s roll...
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Using Handlebars.js!
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http://githubquiz.heroku.com/
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http://githubquiz.heroku.com/live
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https://github.com/commondream/github_quiz
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Using Templates
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var template = Handlebars.compile(“{{someTemplate}}”);
template({some: data});
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...your template here...
Template
JavaScript
var template = Handlebars.compile($(‘#live-template’).html());
$(‘#spot-to-put-stuff’).html(template({some: data}));
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All About Context
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{ :
[
{ : “Handlebars.js”,
: “Awesome JavaScript Templating” },
{ title: “Rails”,
description: “Ruby on Rails” }
]
}
projects
title
description
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projects
title
description
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<% projects.each do |project| %>
<%= project.title %>
<%= project.description %>
<% end %>
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{{#projects}}
{{title}}
{{description}}
{{/projects}}
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The Handlebars.js
Language
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Superset of Mustache
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Comments
{{! This is a comment}}
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{{! Shuffle the answers}}
{{#shuffle answers}}
{{#this}}
{{> answer}}
{{/this}}
{{/shuffle}}
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Expressions
{{expression}}
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Who maintains the {{title}} project?
Here's a hint. The project's description is:
{{description}}
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if value is truthy
output value.toString()
else
don’t output anything
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Blocks
Conditional, Iteration, Scope
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{{#url}}
We won’t ever get here, because url is falsy - it’s undefined
{{/url}} Data { title: “Handlebars.js”, description: “Awesome JavaScript Templating” } TemplateSlide 39
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-
{{#names}}
- {{this}} {{/names}}
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{{#question}}
Who maintains the {{title}} project?
Here's a hint. The project's description is:
{{description}}
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Inverted Blocks
{{^ inverted}}
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{{^url}}
We’ll get here, since we’re in an inverted block
{{/url}} Data { title: “Handlebars.js”, description: “Hooray JavaScript Templating” } TemplateSlide 43
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Partials
{{> partial}}
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Handlebars.registerPartial(“answer”,
‘
...answer content goes here...
’);
{{#answers}}
{{> answer}}
{{/answers}}
Partial
Template
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Syntactic Sugar
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Path Goodies
Dots {{question.title}
Backtracking {{../title}}
this {{this}}
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Blocks with Else
{{#foo}}{{else}}{{/foo}}
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{{#url}}
We won’t ever get here, because url is falsy - it’s undefined
{{else}}We will get here, though.
{{/url}} Data { title: “Handlebars.js”, description: “Awesome JavaScript Templating” } TemplateSlide 49
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{{#url}}
We won’t ever get here, because url is falsy - it’s undefined
{{/url}} {{^ url}}We will get here, though.
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Helpers!
{{helper}} and {{#helper}}
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Handlebars.registerHelper(“myHelper”, function(arg1, arg2, options) {
var inside = options.fn(arg1, arg2);
var elseStuff = options.inverse(stuff);
return “
” + inside + “
”;
});
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Handlebars.registerHelper(“myHelper”, function(arg1, arg2, options) {
var inside = options.fn(arg1, arg2);
return “
” + inside + “
”;
});
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Handlebars.registerHelper(“myHelper”, function(arg1, arg2, options) {
var inside = options.fn(arg1, arg2);
var elseStuff = options.inverse(stuff);
return “
” + inside + “
”;
});
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Handlebars.registerHelper(“myHelper”, function(arg1, arg2, options) {
var inside = options.fn(arg1, arg2);
var elseStuff = options.inverse(stuff);
return “
” + inside + “
”;
});
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Handlebars.registerHelper(“image”, function(url) {
return ‘
’;
});
{{image “http://githubquiz.commondream.net/logo.png”}}
Helper
Template
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Handlebars.registerHelper("shuffle", function(array, options) {
var newArray = [];
if (Math.random() > 0.5) {
newArray = [array[0], array[1]];
}
else {
newArray = [array[1], array[0]];
}
return options.fn(newArray);
});
Helper
Template
{{#shuffle answers}}
{{#this}}
... output the answer here...
{{/this}}
{{/shuffle}}
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function ifHelper(context, options) {
if(!context ||
Handlebars.Utils.isEmpty(context)) {
return options.inverse(this);
} else {
return options.fn(this);
}
});
Handlebars.registerHelper('if', ifHelper);
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Built-In Helpers
If, Unless, Each, With
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Everything’s a helper!
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Handlebars.registerHelper('blockHelperMissing', function(context, options) {
var inverse = options.inverse || function() {}, fn = options.fn;
var ret = "";
var type = Object.prototype.toString.call(context);
if(type === "[object Function]") {
context = context();
}
if(context === true) {
return fn(this);
} else if(context === false || context == null) {
return inverse(this);
} else if(type === "[object Array]") {
if(context.length > 0) {
for(var i=0, j=context.length; i
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The Future!
http://stuffrandomgeek.blogspot.com/2010/11/laser-cats.html
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Precompilation
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More Speed!
http://www.flickr.com/photos/sahlgoode/5951308626/
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Questions?
Learn more at http://www.handlebarsjs.com