Angular directive has issues with $compile functionality

This Angular directive automatically appends a new HTML item to the page every time my model changes:

app.directive('helloWorld', function($compile) {
    return {
        restrict: 'AE',
        replace: true,

        scope:{
            arrayItem: '=ngModel'
        },
        link: function ($scope, ele, attrs) {
            $scope.$watch( 'ngModel' , function(){
                ele.html('<div ng-click="sendLike({{arrayItem.data.timeline_content}})" class="timeline-item"> Hello {{arrayItem2.data.timeline_content}} </div>');
                $compile(ele.contents())($scope);
            });
        }
    };
});

Here is the HTML view for this functionality:

<hello-world ng-repeat="arrayItem in arr" ng-model="arrayItem"></hello-world>

However, I am facing an issue where the ng-click inside the dynamically generated HTML does not work. The recompiling of the newly added section is also not functioning as expected.

UPDATE:

This is the desired outcome:

I am creating a chat application where messages are stored in an array and need to be bound to the HTML view. Upon clicking on each message, an alert() should be triggered within the controller. My controller code looks like this:

app.controller("timelineCtrl", function ($scope) {
    $scope.arr={};

    $scope.sendLike = function (id) {
        alert(id);
    };
         .
         .
         .
}

In traditional jQuery, I would use DOM manipulation methods to add new tags for each message. In Angular, I have to bind that array using ng-model or similar approach.

Initially, I thought designing a directive would be a good solution. I can access the main scope from inside the module and make necessary adjustments with the directive. However, changes inside the directive do not reflect in the HTML view as expected, causing issues like ng-click not working for dynamically created tags.

Answer №1

If you want to achieve this task, there are two different methods you can use – one with a directive and the other without.

Let's first look at how you can do it without using a directive. In this case, we assume that you already have an array available in the controller.

<div ng-controller="timelineCtrl" class="timelineframe">
  <div ng-repeat="post in timeline | orderBy:'-lineNumber'" class="post">
    <div ng-click="sendAlert(post)">
      <span class="postnumber">{{::post.lineNumber}}:</span>
      <span class="message">{{::post.message}}</span>
    </div>
  </div>
</div>

In this setup, each object added to $scope.timeline gets a lineNumber, and by utilizing Angular's OrderBy filter with '-lineNumber', we can sort the posts in reverse order based on their line numbers. The function $scope.sendAlert(post) will handle clicking on a specific post. By using :: in our bindings, we ensure one-time data binding, enhancing performance especially with large datasets.

Alternatively, you can utilize a Directive to achieve the same outcome. This involves creating a custom Directive responsible for rendering individual posts.

app.directive('timelinePost', function() {
  return {
    restrict: 'AE',
    scope:{
       post: '='
    },
    template: '<div ng-click="postCtrl.sendAlert()">
                 <span class="postnumber">{{::postCtrl.post.lineNumber}}:</span>
                 <span class="message">{{::postCtrl.post.message}}</span>
               </div>',
    controller: 'postController',
    controllerAs: 'postCtrl',
    bindToController: true
};


app.controller("postController", function(){
  var self = this;  
  self.sendAlert = function(){
    //self.post contains the specific post due to bindToController
  };
};

//HTML usage:
<div ng-controller="timelineCtrl" class="timelineframe">
  <div ng-repeat="post in timeline | orderBy:'-lineNumber'" class="post">
    <timeline-post post='post'></timeline-post>
  </div>
</div>

You could take this a step further by encapsulating the entire timeline functionality into another directive if needed. Both methods accomplish the goal of organizing and displaying data, with the latest post appearing first and updating automatically when the array changes. In the non-directive approach, functions like $scope.sendAlert reside in timelineCtrl, while in the directive method, they belong to the directive's controller postController.

This is a preliminary solution based on your requirements and my recent research. While I haven't tested it extensively with actual data, the outlined logic should provide a solid starting point for your implementation.

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