CanJs Livebinding vs. Ember vs. Backbone vs. Knockout vs. YUI - JSFiddle

HTML

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<script src="http://underscorejs.org/underscore-min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script src="http://backbonejs.org/backbone-min.js"></script>
<script src="https://github.com/downloads/emberjs/ember.js/ember-0.9.8.1.js"></script>
<script src="http://cloud.github.com/downloads/SteveSanderson/knockout/knockout-2.0.0.js"></script>
<script src="http://yui.yahooapis.com/3.5.0pr2/build/yui/yui-min.js"></script>
<script src="http://canjs.us/release/latest/can.jquery.js"></script>
<script src="http://canjs.us/release/latest/can.view.mustache.js"></script>
​
<button onclick="runCan('ejs')">Animate with Can (EJS)</button>
<button onclick="runCan('mustache')">Animate with Can (Mustache)</button>
<button onclick="runBackbone()">Animate with Backbone</button>
<button onclick="runEmber()">Animate with Ember</button>
<button onclick="runKnockout()">Animate with Knockout</button>
<button onclick="runYUI()">Animate with YUI</button>
<button onclick="reset()">Reset</button>
​
<div id="grid"></div>
​
<script type="text/ejs" id="ejs-template">
  <% can.each(boxes, function( box ) { %>
    <div class="box-view">
      <div class="box" id="box-<%= box.count  %>" style="<%= box.style() %>">
        <%= box.content() %>
      </div>
    </div>
  <% }) %>
</script>
​
<script type="text/mustache" id="mustache-template">
  {{#boxes}}
  <div class="box-view">
    <div class="box" id="{{count}}" style="{{style}}"}}>
      {{content}}
    </div>
    </div>
  {{/#boxes}}
</script>
​
<script type="x-template" id="underscore-template">
  <div class="box" id="box-<%= number %>" style="top: <%= top %>px; left: <%= left %>px; background: rgb(0,0,<%= color %>);">
    <%= content %>
  </div>
</script>
​
<script type="text/x-handlebars" id="handlebars-template" data-template-name="box">
  <div class="box" {{bindAttr id="model.number" style="model.style"}}>
    {{ model.content }}
  </div>
</script>
​
<script type="text/x-template" id="knockout-template">
  <div data-bind="foreach: boxes">
    <div class="box-view">
      <div class="box" data-bind="style: {top: top(), left: left(), background: color()}, text: content()"></div>
    </div>
  </div>
</script>
​
<script type="text/x-yui-handlebars" id="yui-handlebars-template">
  <div class="box" id="box-{{number}}" style="top: {{top}}px; left: {{left}}px; background: rgb(0,0,{{color}});">
    {{content}}
  </div>
</script>

JavaScript

Module

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// Change N to change the number of drawn circles.
var N = 100;
​
//CanJS
(function() {
​
    var Box = function() {
        return {
            count: 0,
            top: function() {
                return (Math.sin(this.attr('count') / 10) * 10) + 'px'
            },
            left: function() {
                return (Math.cos(this.attr('count') / 10) * 10) + 'px'
            },
            color: function() {
                return 'rgb(0,0,' + (this.attr('count')) % 255 + ')'
            },
            content: function() {
                return this.attr('count') % 100
            },
            tick: function() {
                var newCount = this.attr('count') + 1;
                this.attr('count', newCount);
            },
            style: function() {
                return 'top: ' + this.top() + '; left: ' + this.left() + '; background: ' + this.color() + ';';
            }
        }
    },
​
        canInit = function(tmpl) {
            boxes = new can.Observe.List();
            for (var i = 0; i < N; i++) {
                boxes.push(new Box());
            }
            if (tmpl === 'ejs') {
                $('#grid').append(can.view('ejs-template', {
                    boxes: boxes
                }));
            } else {
                $('#grid').append(can.view('mustache-template', {
                    boxes: boxes
                }));
            }
        },
        canAnimate = function() {
            can.Observe.startBatch();
            for (var i = 0; i < N; i++) {
                boxes[i].tick();
            }
            can.Observe.stopBatch();
            window.timeout = _.defer(canAnimate);
        };
​
    window.runCan = function(tmpl) {
        reset();
        canInit(tmpl);
        canAnimate();
    };
})();
​
// The Backbone implementation:
(function() {
​
    var Box = Backbone.Model.extend({
​
        defaults: {
            top: 0,
            left: 0,
            color: 0,
            content: 0
        },
​
        initialize: function() {
            this.count = 0;
        },
​
        tick: function() {
            var count = this.count += 1;
            this.set({
                top: Math.sin(count / 10) * 10,
                left: Math.cos(count / 10) * 10,
                color: (count) % 255,
                content: count % 100
            });
        }
​
    });
​
​
    var BoxView = Backbone.View.extend({
​
        className: 'box-view',
​
        template: _.template($('#underscore-template').html()),
​
        initialize: function() {
            this.model.bind('change', this.render, this);
        },
​
        render: function() {
            this.$el.html(this.template(this.model.attributes));
            return this;
        }
​
    });
​
    var boxes;
​
    var backboneInit = function() {
        boxes = _.map(_.range(N), function(i) {
            var box = new Box({
                number: i
            });
            var view = new BoxView({
                model: box
            });
            $('#grid').append(view.render().el);
            return box;
        });
    };
​
    var backboneAnimate = function() {
        for (var i = 0, l = boxes.length; i < l; i++) {
            boxes[i].tick();
        }
        window.timeout = _.defer(backboneAnimate);
    };
​
    window.runBackbone = function() {
        reset();
        backboneInit();
        backboneAnimate();
    };
})();
​
// The Ember implementation:
(function() {
​
    var Box = Ember.Object.extend({
​
        top: 0,
        left: 0,
        content: 0,
        count: 0,
​
        tick: function() {
            var count = this.get('count') + 1;
            this.set('count', count);
            this.set('top', Math.sin(count / 10) * 10);
            this.set('left', Math.cos(count / 10) * 10);
            this.set('color', count % 255);
            this.set('content', count % 100);
        },
​
        style: function() {
            return 'top: ' + this.get('top') + 'px; left: ' + this.get('left') + 'px; background: rgb(0,0,' + this.get('color') + ');';
        }.property('top', 'left', 'color')
​
    });
​
    var BoxView = Ember.View.extend({
        classNames: ['box-view'],
        templateName: 'box'
    });
​
    var boxes;
​
    var emberInit = function() {
        boxes = _.map(_.range(N), function(i) {
            var box = Box.create();
            var view = BoxView.create({
                model: box
            });
            view.appendTo('#grid');
            box.set('number', i);
            return box;
        });
    };
​
    var emberAnimate = function() {
        for (var i = 0, l = boxes.length; i < l; i++) {
            boxes[i].tick();
        }
        window.timeout = _.defer(emberAnimate);
    };
​
    window.runEmber = function() {
        reset();
        emberInit();
        emberAnimate();
    };
​
})();
​
// The Knockout implementation:
(function() {
​
    var Box = function() {
        this.count = ko.observable(0);
        this.top = function() {
            return (Math.sin(this.count() / 10) * 10) + 'px'
        };
        this.left = function() {
            return (Math.cos(this.count() / 10) * 10) + 'px'
        };
        this.color = function() {
            return 'rgb(0,0,' + (this.count()) % 255 + ')'
        };
        this.content = function() {
            return this.count() % 100
        };
​
​
        this.tick = function() {
            this.count(this.count() + 1);
        }
    }
​
    var ViewModel = function(num) {
        this.num = num;
        this.boxes = ko.observableArray();
        for (var i = 0; i < num; i++) {
            this.boxes.push(new Box())
        }
    }
​
    var knockoutAnimate = function() {
        for (var i = 0, l = vm.boxes().length; i < l; i++) {
            vm.boxes()[i].tick();
        }
        window.timeout = _.defer(knockoutAnimate);
    }
​
    window.runKnockout = function() {
        $('#grid').html($('#knockout-template').html());
        vm = new ViewModel(100)
        ko.applyBindings(vm, $('#grid')[0]);
        knockoutAnimate();
    };
​
})();
​
// The YUI implementation:
YUI().use('model', 'view', 'handlebars', function(Y) {
​
    Y.Box = Y.Base.create('box', Y.Model, [], {
        initializer: function() {
            this.count = 0;
        },
​
        tick: function() {
            var count = this.count += 1;
​
            this.setAttrs({
                top: Math.sin(count / 10) * 10,
                left: Math.cos(count / 10) * 10,
                color: (count) % 255,
                content: count % 100
            });
        }
    }, {
        ATTRS: {
            top: {
                value: 0
            },
            left: {
                value: 0
            },
            color: {
                value: 0
            },
            content: {
                value: 0
            },
            number: {}
        }
    });
​
    Y.BoxView = Y.Base.create('boxView', Y.View, [], {
        template: Y.Handlebars.compile(Y.one('#yui-handlebars-template').getContent()),
​
        initializer: function() {
            this.get('model').after('change', this.render, this);
        },
​
        create: function() {
            return Y.Node.create('<div class="box-view" />');
        },
​
        render: function() {
            var content = this.template(this.get('model').toJSON());
            this.get('container').setContent(content);
            return this;
        }
    });
​
    var boxes;
​
    var yuiInit = function() {
        boxes = _.map(_.range(N), function(i) {
            var box = new Y.Box({
                number: i
            });
            var view = new Y.BoxView({
                model: box
            });
            Y.one('#grid').append(view.render().get('container'));
            return box;
        });
    };
​
    var yuiAnimate = function() {
        for (var i = 0, l = boxes.length; i < l; i++) {
            boxes[i].tick();
        }
        window.timeout = _.defer(yuiAnimate);
    };
​
    window.runYUI = function() {
        reset();
        yuiInit();
        yuiAnimate();
    };
​
});
​
window.timeout = null;
window.reset = function() {
    $('#grid').empty();
    clearTimeout(timeout);
};

CSS

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p {
  font: 12px/16px Arial;
  margin: 10px 10px 15px;    
}
​
button {
  font: bold 14px/14px Arial;  
  margin-left: 10px;
}
​
#grid {
  margin: 10px;   
}
​
.box-view {
  width: 20px; height: 20px;
  float: left;
  position: relative;
  margin: 8px;    
}
​
.box {
  border-radius: 100px;
  width: 20px; height: 10px;
  padding: 5px 0;
  color: #fff;
  font: 10px/10px Arial;
  text-align: center;
  position: absolute;
}   
​

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