By Jorge Ferrando

Implement a winning JavaScript-rich program with KnockoutJS, jQuery, and Bootstrap

About This Book

  • Create wealthy web purposes utilizing JavaScript
  • In a step by step demeanour, discover how one can customise and expand KnockoutJS to take your app to the following level
  • Great examples express how KnockoutJS can simplify your code and make it extra robust

Who This e-book Is For

If you're a JavaScript developer who has been utilizing DOM manipulation libraries resembling Mootools or Scriptaculous, and also you wish pass additional in sleek JavaScript improvement with an easy and well-documented library, then this booklet is for you. studying how one can use Knockout might be excellent as the next move in the direction of development JavaScript functions that reply to person interaction.

In Detail

KnockoutJS is a version View ViewModel (MVVM) framework to be able to simplify the layout of advanced person. Knockout makes info manipulation uncomplicated and results in maintainable net applications.

KnockoutJS necessities grants an perception into the easiest practices while designing and construction MVVM internet functions utilizing the KnockoutJS framework. jam-packed with real-world projects, this publication begins with an advent to the Knockout library, supporting you are making organizational and layout judgements. You get a walk-through of the most important ideas and phrases which are universal to improvement of Knockout purposes. ultimately, you are going to find out about the full-stack Knockout framework DurandalJS, in order to offer you all of the instruments you must write whole single-page applications.

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Extra resources for Knockout.JS Essentials

Sample text

Imagine that you have a list of categories where each category contains a list of products. These products are a list of IDs and the category has a method to get the name of their products. ID)">

Look how helpful the as attribute is inside the foreach binding. It makes code more readable. But if you are inside a foreach loop, you can also access each item using the $data magic variable, and you can access the position index that each element has in the collection using the $index magic variable.

We also have two more

tags at the bottom that will contain the modal dialogs to show the form to add products to our catalog (the one we built in Chapter 1, Refreshing the UI Automatically with KnockoutJS) and the other one will contain a modal message to tell the user that our order is finished. Along with this code you can see a template binding inside the data-bind attribute. This is the binding that Knockout uses to bind templates to the element. It contains a name parameter that represents the ID of a template.

Knockout just tells us about inserting or deleting elements in the array, but not about editing elements. If you want to know what is happening in an element, the object should have observable properties. [ 21 ] Refreshing the UI Automatically with KnockoutJS An observableArray observable just tracks which objects it holds, and notifies listeners when objects are added or removed. Behind the scenes, the observableArray is actually an observable whose value is an array. So you can get the underlying JavaScript array by invoking the observableArray observable as a function with no parameters, just like any other observable.

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