How to listen to rendering using AngularJS

This time I will show you how to use AngularJS to monitor rendering, and what are the precautions for using AngularJS to monitor rendering. The following is a practical case, let's take a look.

Actually it is formed through the ng-repeat of Angular, the code in html It is:

<li ng-repeat="for list in lists()" id="{{ list.id }}">{{ list.name }}</li>

Create a new listbutton at the bottom of the picture. After clicking, a new will be push in the lists array. list object, the page will be automatically rendered at this time, and a <li> will be added accordingly, as follows:

NoteMyList1 has always been in the active state (class="active"). My requirement is to add the list after adding it. list is set to active, that is, after adding it, it becomes the following style:

In the function corresponding to button, after push the new list object into the lists array, use document.getElementById to obtain it Go to the newly added <li> object, and then add a class="active" to it. It turns out that the obtained DOM object is null, after searching, we found that the reason is: after pushing the push object to the lists array, the array changes, and all <li> will be re-rendered. After push is completed, immediately look for the newly added DOM object. DOM has not been rendered yet, so it cannot be obtained. The solution is: use the AngularJS instruction to monitor whether ng-repeat is completed, and after the rendering is completed, get the new <li> object , there is a lot of related content on this Internet, the code is as follows:

myapp.directive('repeatFinish', function ($timeout) {
  return {
    restrict: "C",
    link: function (scope, element, attr) {
      if(scope.$last === true){
        $timeout(function () {
          scope.change_list(element[0]);
        }, 10);
      }
    }
  }
});

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