I'm trying to write a dynamic template using TypeScript and Angular, however for some reason the 'this' keyword is always null, thus I cannot access my private member $compile. Any ideas? Many Thanks! :-)
Directive:
namespace ROD.Features.Player {
"use strict";
export class VideoDirective implements ng.IDirective {
public restrict: string = "E";
public replace: boolean = true;
public scope = {
content: "="
};
constructor(private $compile: ng.ICompileService) {
}
public link(element: JQuery, scope: ng.IScope): any {
const youtubeTemplate = "<p>Youtube</p>";
const vimeoTemplate = "<p>Vimeo</p>";
var linkFn = this.$compile(youtubeTemplate);
const content: any = linkFn(scope);
element.append(content);
}
}
}
App.ts:
namespace ROD {
"use strict";
angular.module("rodApp", [])
.service("Settings", [() => new Settings.DevelopmentSettings()])
.service("RedditService", [
"$http", "Settings",
($http: ng.IHttpService, settings: Settings.ISettings) => new Services.Reddit.RedditService($http, settings.sourceUrl),
])
.directive("videoItem", ["$compile",
($compile: ng.ICompileService) => new Features.Player.VideoDirective($compile)])
.controller("PlayerController", [
"$scope", "RedditService",
($scope: any, redditService: Services.Reddit.IRedditService) => new Features.Player.PlayerController($scope, redditService),
]);
}
You need to have:
instead of
in your
app.js
. An explanation of the problem is here: http://www.michaelbromley.co.uk/blog/350/exploring-es6-classes-in-angularjs-1-x#_section-directives The gist of the problem is that when angular callslink
function, the context of this is not preserved.If you want to understand the issue more in-depth, just use
angular.js
instead ofangular.min.js
and have a look what the call stack looks like.It appears that I was using the wrong syntax for the link function. This is the correct implementation:
Can anyone explain why this is? :-)