ch02-09-ng-repeat-track-id.html
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<!DOCTYPE html>
<html ng-app="notesApp">
<head>
<title>Notes App</title>
<script src="../../tp/angular.js"></script>
<style>
span {
background-color: #cce;
}
</style>
</head>
<body ng-controller="MainCtrl as ctrl">
<button ng-click="ctrl.changeNotes()">Change Notes</button>
<br/>
DOM Elements change at every click
<div ng-repeat="note in ctrl.notes1">
{{note.$$hashKey}}
<span class="label"> {{note.label}} </span>
<span class="author"> {{note.done}} </span>
</div>
<br/>
DOM Elements are reused at every click
<div ng-repeat="note in ctrl.notes2 track by note.id">
{{note.$$hashKey}}
<span class="label"> {{note.label}} </span>
<span class="author"> {{note.done}} </span>
</div>
<script type="text/javascript">
angular.module('notesApp', []).controller('MainCtrl', [
function () {
var self = this;
var notes = [
{id: 1, label: 'First note', done: false, someRandom: 31431},
{id: 2, label: 'Second note', done: false},
{id: 3, label: 'Finished third note', done: true}
];
self.notes1 = angular.copy(notes);
self.notes2 = angular.copy(notes);
self.changeNotes = function () {
notes = [
{id: 1, label: 'Changed note', done: false, someRandom: 4242},
{id: 2, label: 'Second note', done: false},
{id: 3, label: 'Finished third note', done: true}
];
self.notes1 = angular.copy(notes);
self.notes2 = angular.copy(notes);
}
}
]);
</script>
</body>
</html>