December 2014
Intermediate to advanced
102 pages
1h 45m
English
Content preview from Knockout.js
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Chapter 6. Multiple ViewModels, Custom Data Bindings, and Templates
Binding Multiple ViewModels
Whether you are simply looking to keep your ViewModels nice and clean, or you have a shared ViewModel that appears on each page, there will come a time when you wish to bind multiple ViewModels on a single page.
Knockout makes this quite easy. There is an optional second parameter that can be passed into the ko.applyBindings function that tells Knockout to limit its binding within this block of HTML.
Example 6-1 almost looks the same as some of the previous examples where a simple name was being bound. There are a few subtle differences that get this to work.
Example 6-1. Binding two ViewModels on a single page
<!DOCTYPE html><html><head><title>Data Binding with KnockoutJS</title></head><body><divid="viewModel1"><h1data-bind="text: name"></h1></div><divid="viewModel2"><h1data-bind="text: name"></h1></div><scripttype='text/javascript'src='js/knockout-3.2.0.js'></script><script>functionViewModel(name){varself=this;self.name=name;};varviewModel1=newViewModel('Steve Kennedy');ko.applyBindings(viewModel1,document.getElementById('viewModel1'));varviewModel2=newViewModel('Mike Wilson');ko.applyBindings(viewModel2,document.getElementById('viewModel2'));</script></body></html>
First, there are two h1 tags placed inside their own div tag. This div tag contains an id attribute that is important for this example to function properly.
In the JavaScript, ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.