ng repeat explaination

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Hi all,
I have a case but i really don't know why . Pls explain for me:
In view:
<button ng-click="additem()">Add Item/button>
< div id="employeesPopup" ng-repeat="e in employeesReceiveMessage" >
< div class="col-md-2">
{{e.Name}}
< /div>

In js file:
With code :
$scope.additem = function () {
$scope.employeesReceiveMessage = [{
ID: 1,
Name: 'A B'
}];
};
It works correctly. Div employeesPopup display item which is assigned.

With code in select event in autocomplete:
$("#employee").autocomplete({
select: function (event, ui) {
$scope.employeesReceiveMessage = [{
ID: 1,
Name: 'A B'
}];
}
})
It does not update the view. I have to put $scope.$apply(); after to work correctly.

Pls explain for me.
Thanks.

Posted 25-Jul-15 18:39pm

baotdinh

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wmdroshan · Answer 1 · 2015-07-30T03:21:00

Hi Alixeer,

Your code deals with two worlds here. AngularJS world and jQuery world (or non-AngularJS world).

ng-click wraps the $apply() call internally. So you don't have to call it explicitly. As a result $apply() will be called automatically. After $apply() ends, digest cycle ($rootScope.$digest()) runs and watchers will be called. This updates the DOM with the new model value (as you have {{}}).

But the following model update from the jQuery doesn't trigger this flow.

JavaScript

<pre lang="php">$("#employee").autocomplete({
select: function (event, ui) {
$scope.employeesReceiveMessage = [{
ID: 1,
Name: 'A B'
}];
}
})

As a result, you have to explicitly call $apply() to trigger the above mentioned flow.

Hope that makes sense.

Regards,
Roshan.