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PORefresh the typeahead content with angularjs
 

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  1. PORefresh the typeahead content with angularjs
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    <p>The situation I have is the following:</p> <p>I have a search field where the user types a text, and a webservice tries to suggest values based on the information entered so far.</p> <p>My problem is that the webservice sometimes takes 2-3 seconds to generate the data, and the typeahead list is not filled in time.</p> <pre><code> &lt;form data-ng-submit="selectItem(message);"&gt; &lt;input type="text" data-ng-model="message" data-ng-change="handleChange(message);" data-typeahead-wait-ms="500" data-typeahead="o for o in searchOptions | filter:$viewValue | limitTo:8"&gt; &lt;input type="submit" style="height: 0px; width: 0px; border: none; padding: 0px;" data-hidefocus="true" /&gt; &lt;/form&gt; </code></pre> <p>I could change the <code>typeahead-wait-ms</code> to 3000, but that would make the other requests very slow (the requests are normaly 100-150ms). What I would like to do is to force angularjs to redraw the typeahead options once it has the data in <code>$scope.searchOptions</code>. Is there any way to do that?</p> <p>I tried to use <code>ng-show</code> (hiding and showing), tried to change the <code>$scope.message</code> (add and remove space), and nothing forced the regeneration of display so far.</p> <p><strong>Update:</strong> </p> <p>The javascript part is as follows (there is a delay counter which calls the triggerSearch only when the search Field hasn't updated since 500msec, i removed it for simplicity):</p> <pre><code>var triggerSearch = function() { searchService.setString($scope.message); // this gives the search string to service $injector.get('$rootScope').$broadcast('startSearch'); }; </code></pre> <p>then this message is listened in another controller:</p> <pre><code>$scope.$on('startSearch', function() { // here there is a $http.get which gets all the data after reading search string searchService.setOptions(selectionlist); // this gives back the result $injector.get('$rootScope').$broadcast('updatedOptions'); // calls the original controller } </code></pre> <p>And then in the original controller</p> <pre><code>$scope.$on('updatedOptions', function() { $scope.searchOptions = searchService.getOptions(); // reading the list from service $scope.$apply(); // tried this - didnt work. }); </code></pre> <p>The thing is, that when I add the result of the service in a normal data on the page, it gets correctly displayed when the data becomes available, i.e. 2 seconds later. However the typeahead list is not updated.</p> <p><strong>Update 2</strong></p> <p>Just to be more specific about last sentence:</p> <pre><code>&lt;form data-ng-submit="selectItem(message);"&gt; &lt;input type="text" data-ng-model="message" data-ng-change="handleChange(message);" data-typeahead-wait-ms="500" data-typeahead="o for o in searchOptions | filter:$viewValue | limitTo:8"&gt; &lt;input type="submit" style="height: 0px; width: 0px; border: none; padding: 0px;" data-hidefocus="true" /&gt; &lt;/form&gt; {{searchOptions}} </code></pre> <p>If I add this last line, this is correctly updated when the service has finished filling this data. It's only the typeahead which is not refreshed. So in the case above, I start typing the search substring, when the search has finished the {{searchOptions}} is correctly updated with search results. </p> <p>The question is: is there any way to force the regeneration of the input field, so that the typeahead tag with the new data is taken into consideration?</p>
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    1. COHave you tried `$scope.$apply()`, are you using a `$.ajax` for the webservice call? If so, try `$http`.
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      1. USsushain97
    2. COThe Webservice is in a different controller - I am using a shared service of the angular.module to communicate ($broadcast and $on). The webservice broadcasts a String when the data is available, and in this controller, upon receiving the broadcast, I am taking it from the service, injecting it in searchOptions. Yes, I tried $scope.$apply, it didnt help sadly.
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      1. USzborha
    3. COPost a minimal reproduce scenario, otherwise it is next to impossible to guess what is going on in your case. The typeahead can perfectly work with async data...
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