Knockout.js Todo Example

by Rupesh Kokal

HTML

<script src="http://knockoutjs.com/downloads/knockout-2.3.0.js"></script>
<div>
    <div data-bind="event: { mouseover: enableDetails, mouseout: disableDetails }">
        Mouse over me
    </div>
    <div data-bind="visible: detailsEnabled">
        Details
    </div>
    <br>
    <input type="text"/><br>
    <label tabIndex="2" data-bind="tabKeyUp: keyCode">Tap on me and press key to know key code</label>
    <br>
    <label>Key Code: </label>
    <label data-bind="text:keyCode"></label>
    <br>
    <input type="text"/>
</div>

CSS

body {
	font-size: 14px;
	background: #eeeeee;
	color: #333333;
	width: 520px;
	margin: 0 auto;
}

#todoapp {
	background: #fff;
	padding: 20px;
	margin-bottom: 40px;
}

#todoapp h1 {
	font-size: 36px;
	text-align: center;
}

#todoapp input[type="text"] {
	width: 466px;
	font-size: 24px;
	line-height: 1.4em;
	padding: 6px;
}

#main {
	display: none;
}

#todo-list {
	margin: 10px 0;
	padding: 0;
	list-style: none;
}

#todo-list li {
	padding: 18px 20px 18px 0;
	position: relative;
	font-size: 24px;
	border-bottom: 1px solid #cccccc;
}

#todo-list li:last-child {
	border-bottom: none;
}

#todo-list li .edit {
    display: none;
}
#todo-list li.editing {
	border-bottom: 1px solid #778899;
}

#todo-list li.editing .view {
	display: none;
}
#todo-list li.editing .edit {
	display: block;
	width: 444px;
	padding: 13px 15px 14px 20px;
	margin: 0;
}

#todo-list li.done label {
    color: #777777;
    text-decoration: line-through;
}


#todo-list .destroy {
	position: absolute;
	right: 5px;
	top: 20px;
	display: none;
	cursor: pointer;
	width: 20px;
	height: 20px;
}

#todoapp footer {
	display: none;
	margin: 0 -20px -20px -20px;
	overflow: hidden;
	color: #555555;
	background: #f4fce8;
	border-top: 1px solid #ededed;
	padding: 0 20px;
	line-height: 37px;
}

.todo-count {
    float:left;    
}

.todo-count .count{
    font-weight:bold;    
}

#clear-completed {
	float: right;
	line-height: 20px;
	text-decoration: none;
	background: rgba(0, 0, 0, 0.1);
	color: #555555;
	font-size: 11px;
	margin-top: 8px;
	margin-bottom: 8px;
	padding: 0 10px 1px;
	cursor: pointer;
}

JavaScript

ko.bindingHandlers.tabKeyUp = {
    init: function (element, valueAccessor, allBindingsAccessor, viewModel) {
    debugger;
           var allBindings = allBindingsAccessor();
            $(element).on('keyup', function (e) {
            debugger;
                var keyCode = e.which || e.keyCode;
                if (keyCode !== 13) {
                    return true;
                }
								valueAccessor()(keyCode);
                var target = e.target;
                target.blur();
                return false;
            });
    }
};

    var viewModel = {
        detailsEnabled: ko.observable(false),
        keyCode: ko.observable("0"),
        enableDetails: function() {
            this.detailsEnabled(true);
        },
        disableDetails: function() {
            this.detailsEnabled(false);
        },
        displayCode: function(data, event) {
        debugger;
            this.keyCode(event.keyCode);
        }
    };
    ko.applyBindings(viewModel);