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POAngularjs: How to display loading-icon when using 'resolve' in $routeProvider?
 

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  1. POAngularjs: How to display loading-icon when using 'resolve' in $routeProvider?
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    <p>The following code reads via a service and shows on the web page a list of 'page' objects for a specific 'page category' (string). Using the resolve object property in $routeProvider.when(), I am able to postpone updating the view until the new value is ready. </p> <p>Two questions:</p> <ol> <li><p>When asking for a new page list, I want to show a loading-icon. How can I detect (in a non-hackish way) the event when the reading from server starts (and the loading-icon should be displayed)? I guess I could do something like $('.pages-loading-icon').show() in the service, but find that to be too gui dependent too placed in the service.</p></li> <li><p>When the new value is ready, I would like the old to fade out and the new to fade in. What is the 'angular' way to do this? I have tried to do it in the controller using $watch, but that causes the new value to be display shortly before the fadeout starts.</p></li> </ol> <p>The code:</p> <p><strong>app.js:</strong></p> <pre><code>$routeProvider.when('/:cat', { templateUrl: 'partials/view.html', controller: RouteCtrl, resolve: RouteCtrl.resolve}); </code></pre> <p><strong>controllers.js:</strong></p> <pre><code>function RouteCtrl($scope, $routeParams, pages) { $scope.params = $routeParams; $scope.pages = pages; } RouteCtrl.resolve={ pages: function($routeParams, Pages){ if($routeParams.hasOwnProperty('cat')){ return Pages.query($routeParams.cat); } } } </code></pre> <p><strong>services.js:</strong> The last pages read is stored in currentPages and its category in lastCat.</p> <pre><code>factory('Pages', function($resource, $q, $timeout){ return { res: $resource('jsonService/cat=:cat', {}, { query: {method:'GET', params:{cat:'cat'}, isArray:true} }), lastCat: null, currentPages: null, query: function(cat) { var res = this.res; if(cat != this.lastCat){ var deferred = $q.defer(); var p = res.query({'cat':cat}, function(){ deferred.resolve(p); }); this.lastCat = cat; this.currentPages = deferred.promise; } return this.currentPages; } }; }) </code></pre> <p><strong>view.html</strong></p> <pre><code>&lt;ul &gt; &lt;li ng-repeat="page in pages"&gt; &lt;a href="#{{params.cat}}/{{page.slug}}"&gt;{{page.title}}&lt;/a&gt; &lt;/li&gt; &lt;/ul&gt; </code></pre>
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