Modifying the className attribute is not feasible in JavaScript

Looking to change the class of the first child inside div#programmation

<div id="programmationEtat">
   <div class="tab-pane ng-scope">...</div>
   <div class="tab-pane ng-scope">...</div>
   <div class="tab-pane ng-scope">...</div>
   ...
</div>

Attempted solution:

var children = document.getElementById("programmationEtat").children;
console.log(children);
children[0].className = 'active';
console.log(children);

First console log displays:

tab-pane ng-scope

Second displays:

active

However, there is no visual change and the HTML remains the same:

<div class="tab-pane ng-scope"> 

What could be the issue ?! Appreciate any help!

UPDATE: Identified the problem: The issue was related to a dynamic directive linked to a scope that included this div:

   app.directive('dynamic', ['$compile', function ($compile) {
  return {
    restrict: 'A',
    replace: true,
    link: function (scope, ele, attrs) {
      scope.$watch(attrs.dynamic, function (html) {
        ele.html(html);
        $compile(ele.contents())(scope);
      });
    }
  };
}]);

Here's the relevant code:

$scope.programmation='...<div id="programmationEtat">
       <div class="tab-pane ng-scope">...</div>
       <div class="tab-pane ng-scope">...</div>
       <div class="tab-pane ng-scope">...</div>
       ...
    </div>...'

HTML:

<div dynamic="programmation" id="programmationEtat">
    ... 
</div>

It appears that updating using document.getElementById(...) on content within $scope.programmation is not possible, modifications must be made directly to $scope.programmation.

To resolve the issue, I utilized the replace function ($scope.programmation.replace(...))!

Answer №1

Learn how to apply dynamic classes using ng-class:

<div id="programmationEtat">
   <div ng-class="className"class="tab-pane ng-scope">...</div>
   <div class="tab-pane ng-scope">...</div>
   <div class="tab-pane ng-scope">...</div>
</div>

$scope.className = 'active';

Alternatively, you can also use this method:

<div id="programmationEtat">
   <div ng-class="{ 'active': activated }"class="tab-pane ng-scope">...</div>
   <div class="tab-pane ng-scope">...</div>
   <div class="tab-pane ng-scope">...</div>
</div>

$scope.activated = true;

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