How do I get data from a json file into an angularjs directive function?

Question

I am trying to use an Angularjs directive to draw canvas elements. I want to pull from a json file to get both the number of canvas elements to draw and properties for the element.

// Define the `myApp` module var myApp = angular.module('myApp', []); // Define the `ListController` controller on the `myApp` module myApp.controller('ListController', function ListController($http, $scope) { $http.get('list.data.json').then(function (response) { $scope.lists = response.data; }); }).directive("appListDraw", function appListDraw() { return { restrict: 'A', link: function (scope, element){ var ctx = element[0].getContext('2d'); ctx.fillStyle = "rgb(200,0,0)"; //I want to insert json data here (list.fill1) ctx.fillRect(10, 10, 50, 50); ctx.fillStyle = "rgba(0, 0, 200, 0.5)"; //I want to insert json data here (list.fill2) ctx.fillRect(30, 30, 50, 50); ctx.stroke(); } } }); 

With the goal being I'll have list.id 1's properties will be in the first canvas list element and list.id 2's properties on the second

list.data.json looks like this:

[ { "id": 1, "fill1": "rgb(200,0,0)", "fill2": "rgba(0,0,200,0.5)", }, { "id": 2, "fill1": "rgb(40,0,0)", "fill2": "rgba(0,0,200,0.5)", }, ] 

And I want to put it into a canvas element like this:

<ul> <li ng-repeat="list in lists"> <canvas name='canvas' width="800" height="100" app-list-draw></canvas> </li> </ul> 

Is there a way I can do this?

I've added a Plunker:http://plnkr.co/edit/gbg6CWVNn1HziSYSTtPP?p=preview

Answer 1

You can apply the list data as a value to the directive name attribute in the canvas element and access the data from the directive scope:

https://jsfiddle.net/kucaexp4/

HTML

<ul> <li ng-repeat="list in lists"> <canvas name='canvas' width="800" height="100" app-list-draw="list"></canvas> </li> </ul> 

Angular

directive("appListDraw", function appListDraw() { return { restrict: 'A', scope: { list: '=appListDraw' }, link: function (scope, element){ var ctx = element[0].getContext('2d'); ctx.fillStyle = scope.list.fill1; //I want to insert json data here (list.fill1)// ctx.fillRect(10, 10, 50, 50); ctx.fillStyle = scope.list.fill2; //I want to insert json data here (list.fill2) ctx.fillRect(30, 30, 50, 50); ctx.stroke(); } }