December 2014
Intermediate to advanced
346 pages
6h 14m
English
Content preview from AngularJS Web application development CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Combining watchers with $watchGroup
You might find that multiple model components need to be tied to the same $watch type callback. As of the 1.3 release, AngularJS provides the $watchGroup method that accepts a collection of watch targets in which all the watch targets need to bind to the same callback.
How to do it…
The change event callback parameters can be an ordered array of the current values, followed by an ordered array of the previous values. This is shown here:
(app.js) angular.module('myApp',[]) .controller('Ctrl', function($scope, $log) { $scope.ping = 'pong'; $scope.ding = { dong: 'ditch' }; // watch ping and the ding.dong property by reference $scope.$watchGroup(['ping', 'ding.dong'], function(newVals, oldVals, scope) { // callback ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.