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    <p>In the code above there's truly only one route <code>'grid/:page'</code>. By defining a parameterized route the router maps everything the match <code>grid/:page</code> to the first route. See more about that in the router documentation <a href="http://durandaljs.com/documentation/Using-The-Router/" rel="nofollow">http://durandaljs.com/documentation/Using-The-Router/</a>.</p> <p>Instead of using the <code>router.navigationModel()</code> build your own small navigation model.</p> <p>Top level down approach:</p> <p><strong>Step 1</strong> Defining a <code>grid</code> route with an optional parameter <code>(/:page)</code>. </p> <pre><code>router .makeRelative({moduleId: 'viewmodels'}) .map([ { route: 'grid(/:page)', title: 'grid page', moduleId: 'grid', hash: '#grid' } ]) .buildNavigationModel(); </code></pre> <p><strong>Step 2</strong> Navigation model</p> <pre><code>define(['plugins/router', 'knockout', './navItem'], function( router, ko, NavItem ) { var ctor = function(){ this.childRouter = router; this.param = ko.observable(''); this.navigation = ko.observableArray([ new NavItem({title: 'Title 1', param: 'param1'}), new NavItem({title: 'Title 2', param: 'param2'}), new NavItem({title: 'Title 3', param: 'param3'}), new NavItem({title: 'Title 4', param: 'param4'}) ]); }; ctor.prototype.activate = function(param){ this.param('Param: ' + (param || 'no param!')); }; return ctor; }); </code></pre> <p><strong>Step 3</strong> Navigation item model</p> <pre><code>define(['plugins/router'], function( router ) { var ctor = function(options){ this._options = options || {}; this.init(this._options) }; ctor.prototype.init = function(options){ this.title = options.title; this.param = options.param; this.hash = '#extras/optional/' + this.param; }; ctor.prototype.isActive = function(){ return router.activeInstruction().fragment === this.hash.replace('#', ''); }; return ctor; }); </code></pre> <p><strong>Step 4</strong> Navigation view</p> <pre><code>&lt;div class="navbar"&gt; &lt;div class="navbar-inner"&gt; &lt;ul class="nav" data-bind="foreach: navigation"&gt; &lt;li data-bind="css: { active: isActive() }"&gt; &lt;a data-bind="attr: { href: hash }, html: title"&gt;&lt;/a&gt; &lt;/li&gt; &lt;/ul&gt; &lt;div class="loader pull-right" data-bind="css: { active: childRouter.isNavigating }"&gt; &lt;i class="icon-spinner icon-2x icon-spin"&gt;&lt;/i&gt; &lt;/div&gt; &lt;/div&gt; &lt;div&gt; &lt;h3 data-bind="text: param"&gt;&lt;/h3&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>Live version can be seen at: <a href="http://dfiddle.github.io/dFiddle-2.0/#extras/optional" rel="nofollow">http://dfiddle.github.io/dFiddle-2.0/#extras/optional</a>. Feel free to fork and adjust to your liking.</p>
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    1. CO@RainierAtSpirit - thanks. Made it much clearer.
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