After experimenting with the code on JSBin, I noticed that the first snippet successfully retrieved the canvas object, while the second one did not.
JSBin: http://jsbin.com/natavejasa/1/edit?html,js,output
var canvas = $window.document.getElementById('myCanvas');
JSBin: http://jsbin.com/yareb/1/edit?html,js,output
var canvas = $document.getElementById('myCanvas');
This leads me to ponder over the distinction between $window.document and $document.
$doc represents angular.element(document), which is a simplified version of document.
$window.doc and window.document both refer to the same DOM element, document.
The statement below is correct:
$window.doc === $doc[0]
$document is a unique Angular service that provides access to the browser's window.document object.
<script>
var app = angular.module('documentPreview', []);
app.controller('PreviewController', ['$scope', '$document', function ($scope,$document) {
$scope.title = $document[0].title;
$scope.windowTitle = angular.element(window.document)[0].title;
}]);
</script>
<div ng-app="documentPreview" ng-controller="PreviewController">
<p>$document title: <b ng-bind="title"></b></p>
<p>window.document title: <b ng-bind="windowTitle"></b></p>
</div>
This scenario is familiar, as if viewed from a different perspective. It's not AngularJS but basic JavaScript; just remove the initial dollar sign. It may seem challenging from an AngularJS standpoint. Whenever feasible, opt for plain JavaScript. These elements have a universal scope.
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