Triggering an event upon completion of ng-repeat's execution

Question

Triggering an event upon completion of ng-repeat's execution

I am facing a challenge in updating the style of a specific element after ng-repeat has finished changing the DOM. The directive I have implemented for triggering ng-repeat works perfectly fine when adding items to the model, but it does not get called when removing an object from the list.

To demonstrate this issue, I have created a function that randomly adds and removes data from the list. You will notice that the removal operation does not trigger the ng-repeat directive call. Is there any way to address this problem?

var module = angular.module('testApp', [])
.directive('onFinishRender', function ($timeout) {
return {
    restrict: 'A',
    link: function (scope, element, attr) {
        if (scope.$last === true) {
            scope.$evalAsync(attr.onFinishRender);
        }
    }
}
});

Fiddle Link

javascript angularjs angularjs-ng-repeat

Answer 1

Answer №1

If you want to achieve this functionality:

<div ng-repeat="item in items" on-finish-render="runTest()"
    ng-init="initialize($last, item)">{{item}}</div>

$scope.initialize = function(isLast, element){
    if(isLast)
        console.log(element)
}

ng-init is a directive that triggers when the element is initialized.
$last is a boolean flag set to true if the current element is the last one in an ng-repeat loop.

Check out the updated Fiddle here

Answer 2

If you want to achieve this functionality:

<div ng-repeat="item in items" on-finish-render="runTest()"
    ng-init="initialize($last, item)">{{item}}</div>

$scope.initialize = function(isLast, element){
    if(isLast)
        console.log(element)
}

ng-init is a directive that triggers when the element is initialized.
$last is a boolean flag set to true if the current element is the last one in an ng-repeat loop.

Check out the updated Fiddle here

Answer 3

Answer №2

Is there a better alternative to using $watch in this situation?

$scope.$watch('ta', function (newVal, oldValue) {
    if(oldValue.length > 0)
    {
        var i = 0; // perform an action
    }
}, true);

This approach allows for more control over when items are added or removed from the array.

Check out this example on JSFiddle

Answer 4

Is there a better alternative to using $watch in this situation?

$scope.$watch('ta', function (newVal, oldValue) {
    if(oldValue.length > 0)
    {
        var i = 0; // perform an action
    }
}, true);

This approach allows for more control over when items are added or removed from the array.

Check out this example on JSFiddle

Answer 5

Answer №3

When you add a new item to the list, it automatically triggers its own update() function upon rendering. Remember, each item in the array has its individual onUpdateRender directive with unique properties.

If you need to perform specific actions after changing the length of the list, consider alternatives to using a directive.

Answer 6

When you add a new item to the list, it automatically triggers its own update() function upon rendering. Remember, each item in the array has its individual onUpdateRender directive with unique properties.

If you need to perform specific actions after changing the length of the list, consider alternatives to using a directive.

Answer 7

Answer №4

An easy and efficient method

<li ng-repeat="data in dataList" ng-init="$last && $parent.myOnFinishHandler();" ></li>

$parent refers to the scope where the datalist is located

angular.module("xyz", []).controller('mc', function($scope) {
  $scope.dataList = ["abc", "123", "xyz", "orange", "apple"];
  $scope.myHandler = function() {
    console.log("render finish ");
  }

});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="xyz">
  <ul ng-controller="mc">
    <li ng-repeat="data in dataList" ng-init="$last && $parent.myHandler();"> {{data}} </li>
  </ul>
</div>

Answer 8

An easy and efficient method

<li ng-repeat="data in dataList" ng-init="$last && $parent.myOnFinishHandler();" ></li>

$parent refers to the scope where the datalist is located

angular.module("xyz", []).controller('mc', function($scope) {
  $scope.dataList = ["abc", "123", "xyz", "orange", "apple"];
  $scope.myHandler = function() {
    console.log("render finish ");
  }

});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="xyz">
  <ul ng-controller="mc">
    <li ng-repeat="data in dataList" ng-init="$last && $parent.myHandler();"> {{data}} </li>
  </ul>
</div>

Answer 9

Answer №5

I stumbled upon the answer while browsing through another solution.

It turns out there isn't a straightforward way to achieve this functionality. I ended up creating a filter that essentially does what I need it to do. Here's the basic idea:

app.filter('ngRepeatFinish', function($timeout){
    return function(data, scope){
        //var scope = this;
        var flagProperty = '__finishedRendering__';
        if(!data[flagProperty]){
            Object.defineProperty(
                data, 
                flagProperty, 
                {enumerable:false, configurable:true, writable: false, value:{}});
            $timeout(function(){
                    delete data[flagProperty];                        
                    scope.$emit('ngRepeatFinished');
                },0,false);                
        }
        return data;
    };
})

This filter broadcasts for every element created, allowing me to run my watch function based on the listening event in the controller.

$scope.$on('ngRepeatFinished', function() {
    //Perform some magic here
})

In order to use this directive, I have to pass the scope from the HTML by adding "this" before ngRepeatFinish.

<div ng-repeat="item in (items | ngRepeatFinish:this)"></div>

Answer 10

I stumbled upon the answer while browsing through another solution.

It turns out there isn't a straightforward way to achieve this functionality. I ended up creating a filter that essentially does what I need it to do. Here's the basic idea:

app.filter('ngRepeatFinish', function($timeout){
    return function(data, scope){
        //var scope = this;
        var flagProperty = '__finishedRendering__';
        if(!data[flagProperty]){
            Object.defineProperty(
                data, 
                flagProperty, 
                {enumerable:false, configurable:true, writable: false, value:{}});
            $timeout(function(){
                    delete data[flagProperty];                        
                    scope.$emit('ngRepeatFinished');
                },0,false);                
        }
        return data;
    };
})

This filter broadcasts for every element created, allowing me to run my watch function based on the listening event in the controller.

$scope.$on('ngRepeatFinished', function() {
    //Perform some magic here
})

In order to use this directive, I have to pass the scope from the HTML by adding "this" before ngRepeatFinish.

<div ng-repeat="item in (items | ngRepeatFinish:this)"></div>

Triggering an event upon completion of ng-repeat's execution

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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