AngularJS: How to run additional code after AngularJS has rendered a template?


I have an Angular template in the DOM. When my controller gets new data from a service, it updates the model in the $scope, and re-renders the template. All good so far.

The issue is that I need to also do some extra work after the template has been re-rendered and is in the DOM (in this case a jQuery plugin).

It seems like there should be an event to listen to, such as AfterRender, but I can't find any such thing. Maybe a directive would be a way to go, but it seemed to fire too early as well.

Here is a jsFiddle outlining my problem: Fiddle-AngularIssue

== UPDATE ==

Based on helpful comments, I've accordingly switched to a directive to handle DOM manipulation, and implemented a model $watch inside the directive. However, I still am having the same base issue; the code inside of the $watch event fires before the template has been compiled and inserted into the DOM, therefore, the jquery plugin is always evaluating an empty table.

Interestingly, if I remove the async call the whole thing works fine, so that's a step in the right direction.

Here is my updated Fiddle to reflect these changes:

By : gorebash

This post is old, but I change your code to:

scope.$watch("assignments", function (value) {//I change here
  var val = value || null;            
  if (val)
    element.dataTable({"bDestroy": true});


I hope it help you

By : dipold

First, the right place to mess with rendering are directives. My advice would be to wrap DOM manipulating jQuery plugins by directives like this one.

I had the same problem and came up with this snippet. It uses $watch and $evalAsync to ensure your code runs after directives like ng-repeat have been resolved and templates like {{ value }} got rendered.

app.directive('name', function() {
    return {
        link: function($scope, element, attrs) {
            // Trigger when number of children changes,
            // including by directives like ng-repeat
            var watch = $scope.$watch(function() {
                return element.children().length;
            }, function() {
                // Wait for templates to render
                $scope.$evalAsync(function() {
                    // Finally, directives are evaluated
                    // and templates are renderer here
                    var children = element.children();

Hope this can help you prevent some struggle.

By : danijar

Following Misko's advice, if you want async operation, then instead of $timeout() (which doesn't work)

$timeout(function () { $scope.assignmentsLoaded(data); }, 1000);

use $evalAsync() (which does work)

$scope.$evalAsync(function() { $scope.assignmentsLoaded(data); } );

Fiddle. I also added a "remove row of data" link that will modify $scope.assignments, simulating a change to the data/model -- to show that changing the data works.

The Runtime section of the Conceptual Overview page explains that evalAsync should be used when you need something to occur outside the current stack frame, but before the browser renders. (Guessing here... "current stack frame" probably includes Angular DOM updates.) Use $timeout if you need something to occur after the browser renders.

However, as you already found out, I don't think there is any need for async operation here.

This video can help you solving your question :)
By: admin