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KnockoutJS: Tracking menu clicks
<script id="menuItemTemplate" type="text/html">
    <li class='${ Class }' >
        <a class='${ Class }' data-bind='click: function() { viewModel.menuClicked(Id); }'>${ Name }</a>
        <ul class='${ Class }' data-bind='template: { name: "menuItemTemplate", foreach: Items }'></ul>
    <li>
</script>
<script id="menuTemplate" type="text/html">
    <ul class='${ Class }' data-bind='template: { name: "menuItemTemplate", foreach: Items }'></ul>
</script>
<script id="consoleTemplate" type="text/html">
    <div class='${ Class }' data-bind='template: { name: "menuTemplate", data: Menu }'></div>
</script>
<h2>Application Administration</h2>
<div id="console" class="console" data-bind='template: { name: "consoleTemplate", foreach: Panels }'>
</div>

$(function () {
var viewModel = {
    "Panels": [
        {
        "Id" : 1,
        "Class": "main",
        "Menu": {
            "Id": 1,
            "Class": "file",
            "Name": "File",
            "Items": [{
                "Id": 1,
                "Class": "open",
                "Name": "Open",
                "Items": []
            }]
        }
    }]
};

    $.ajax({
        url: 'console.asmx/Initialize',
        type: "POST",
        cache: false,
        contentType: "application/json; charset=utf-8",
        data: "{}",
        dataType: "json",
        success: function (data) {
            viewModel = data.d;
            viewModel.menuActive = ko.observable(false);
            viewModel.currentMenu = ko.observable(0);
            viewModel.menuClicked = function (id) {
                viewModel.menuActive(true);
                viewModel.currentMenu(id);
            };
            ko.applyBindings(viewModel);
        }
    });
});

<script id="menuItemTemplate" type="text/html">
    <li class='${ Class }' data-bind='visible: viewModel.menuActive && viewModel.currentMenu == Id'>
        <a class='${ Class }' data-bind='click: function() { viewModel.menuClicked(Id); }'>${ Name }</a>
        <ul class='${ Class }' data-bind='template: { name: "menuItemTemplate", foreach: Items }'></ul>
    <li>
</script>