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MASTERING KNOCKOUTJS

You're reading from   MASTERING KNOCKOUTJS Use and extend Knockout to deliver feature-rich, modern web applications

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Product type Paperback
Published in Nov 2014
Publisher
ISBN-13 9781783981007
Length 270 pages
Edition 1st Edition
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Author (1):
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Timothy Moran Timothy Moran
Author Profile Icon Timothy Moran
Timothy Moran
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Toc

Table of Contents (11) Chapters Close

Preface 1. Knockout Essentials FREE CHAPTER 2. Extending Knockout with Custom Binding Handlers 3. Extending Knockout with Preprocessors and Providers 4. Application Development with Components and Modules 5. Durandal – the Knockout Framework 6. Advanced Durandal 7. Best Practices 8. Plugins and Other Knockout Libraries 9. Under the Hood Index

Simple binding handlers

Binding handlers can range from very simple to whole applications by themselves. As the purpose of binding handlers is to translate between the presentation layer (HTML) and the viewmodel (JavaScript), the binding handler's complexity is directly related to the complexity of the UI interaction and the bound data. Simple tasks such as hiding or showing an element with animation will have very thin handlers, while data binding on an interactive map element will require much more logic.

Animated binding handlers

As DOM interaction in the primary use case for jQuery, and given its popularity, it is not uncommon to use jQuery inside Knockout binding handlers. The canonical custom binding handler example from the Knockout documentation is a binding to hide and show elements, with the jQuery's slideUp and slideDown methods, instead of using the standard visible binding to switch them on and off:

ko.bindingHandlers.slideVisible = {
    init: function(element, valueAccessor...
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