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I am trying to create a 'like' function for my app. I want to be able to set the value of a dynamically generated number as the 'like count'. The problem comes in using 'ng-init', as the documentation says this is a bad way to do it!
How do you set the value in the 'controller' rather than the 'view'?
Here is what I have so far:
<!doctype html>
<html ng-app="plunker" >
<head>
<meta charset="utf-8">
<title>AngularJS Plunker</title>
<script>document.write('<base href="' + document.location + '" />');</script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.5/angular.js"></script>
<script src="app.js"></script>
</head>
<body ng-controller="MainCtrl">
<article ng-repeat="feed in feeds">
<h3>{{feed.createdby}}</h3>
<p>{{feed.content}}</p>
<button ng-click="likeClicked($index)">{{isLiked[$index]|liked}}</button>
<span ng-init="likeCount=feed.likes.length">{{likeCount}}</span>
</article>
</body>
</html>
Thanks,
JP
968
The *ngFor directive in Angular is similar to the ng-repeat directive in AngularJS. It repeats the associated DOM element for each item in the specified collection.
The ng-init Directive is used to initialize AngularJS Application data. It defines the initial value for an AngularJS application and assigns values to the variables. The ng-init directive defines initial values and variables for an AngularJS application.
In Angular 1. x, ngInit is called when template is re-rendered. In other words “ng-init” is called, when I take turns back to a page. In Angular2, there is no “ng-init” but we can create a ways like this using the directive and ngOnInit class.
Definition and Usage The ng-repeat directive repeats a set of HTML, a given number of times. The set of HTML will be repeated once per item in a collection. The collection must be an array or an object. Note: Each instance of the repetition is given its own scope, which consist of the current item.
Just change
`<span ng-init="likeCount=feed.likes.length">{{likeCount}}</span>`
per
`<span>{{feed.likes.length}}</span>`.
If you still need the count in the controller for some other reason (which I can't see), create a controller, let's assume FeedCtrl, and add it to your article:
<article ng-repeat="feed in feeds" ng-controller="FeedCtrl">
...
<span>{{likeCount}}</span>
</article>
And your FeedCtrl would be:
function FeedCtrl($scope) {
$scope.$watch('feed.likes.length', function(newValue) {
$scope.likeCount = newValue;
});
}
Yet another approach would be create a function to resolve you the value:
<article ng-repeat="feed in feeds" ng-controller="FeedCtrl">
...
<span>{{likeCount()}}</span>
</article>
function FeedCtrl($scope) {
$scope.likeCount = function() {
return $feed && $feed.likes ? $feed.likes.length : undefined;
};
}
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