8. Creating and Using jQuery Plugins | ASP.NET jQuery Cookbook (Second Edition)

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ASP.NET jQuery Cookbook (Second Edition) - Second Edition

By : Sonal Merchant, Aneel Allana

3.5 (2)

ASP.NET jQuery Cookbook (Second Edition)

3.5 (2)

By: Sonal Merchant, Aneel Allana

Overview of this book

jQuery is a lightweight JavaScript library that has changed the landscape of client scripting in web applications. Developed by John Resig in 2006, it has taken the web by storm because of its cross-browser compatibility and the ability to get more done with less code. It has gained popularity with ASP.NET developers and is now distributed with Visual Studio and the NuGet package manager. ASP.NET jQuery Cookbook explores the wide range of utilities that the jQuery library provides. It teaches you the nitty-gritty of plugging in these features in ASP.NET web applications. It covers every aspect of interfacing the library, right from downloading and including jQuery on web pages to selecting controls, handling events, and creating animations. This book also walks you through DOM traversal and manipulation in ASP.NET and then through visual effects and graphics in ASP.NET sites. It explores advanced features such as posting AJAX requests and writing plugins. It will provide you with all the information you need to use this library confidently with ASP.NET.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Sections

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Started with jQuery in ASP.NET

1. Getting Started with jQuery in ASP.NET

Introduction

Downloading jQuery from jQuery.com

Understanding CDN for jQuery

Using NuGet Package Manager to download jQuery

Adding jQuery to an empty ASP.NET web project using a script block

Adding jQuery to an empty ASP.NET web project using ScriptManager control

Adding jQuery to an ASP.NET Master Page

Adding jQuery programmatically to a web form

Understanding jQuery reference in the default web application template

Hello World in a web project using jQuery

Bundling jQuery in ASP.NET MVC

Using CDN to load jQuery in MVC

Hello World in ASP.NET MVC using jQuery

Debugging jQuery code in Visual Studio

2. Using jQuery Selectors with ASP.NET Controls

2. Using jQuery Selectors with ASP.NET Controls

Introduction

Selecting a control using ID and displaying its value

Selecting a control using the CSS class

Selecting a control using HTML tag

Selecting a control by its attribute

Selecting an element by its position in the DOM

Enabling/disabling controls on a web form

Using selectors in MVC applications

3. Event Handling Using jQuery

3. Event Handling Using jQuery

Introduction

Responding to mouse events

Responding to keyboard events

Responding to form events

Using event delegation to attach events to future controls

Running an event only once

Triggering an event programmatically

Passing data with events and using event namespacing

Detaching events

4. DOM Traversal and Manipulation in ASP.NET

4. DOM Traversal and Manipulation in ASP.NET

Introduction

Adding/removing DOM elements

Accessing parent and child controls

Accessing sibling controls

Refining selection using a filter

Adding items to controls at runtime

5. Visual Effects in ASP.NET Sites

5. Visual Effects in ASP.NET Sites

Introduction

Animating the Menu control

Animating a Label control to create a digital clock

Animating the alt text of the AdRotator control

Animating images in the TreeView control

Creating scrolling text in a Panel control

Creating a vertical accordion menu using Panel controls

Showing/hiding the GridView control with the explode effect

6. Working with Graphics in ASP.NET Sites

6. Working with Graphics in ASP.NET Sites

Introduction

Creating a spotlight effect on images

Zooming images on mouseover

Creating an image scroller

Building a photo gallery using z-index property

Building a photo gallery using ImageMap control

Using images to create effects in the Menu control

Creating a 5 star rating control

Previewing image uploads in MVC

7. Ajax Using jQuery

7. Ajax Using jQuery

Introduction

Setting up Ajax with ASP.NET using jQuery

Consuming page methods

Consuming Web services

Consuming WCF services

Retrieving data from a Web API

Making Ajax calls to a controller action

Making Ajax calls to a HTTP handler

8. Creating and Using jQuery Plugins

8. Creating and Using jQuery Plugins

Introduction

Creating and using a simple plugin

Using the $ alias in the plugin

Calling methods on DOM elements

Providing default values

Providing method chaining

Adding actions to plugins

Using the form validation plugin

Downloading plugins using the NPM

Index

Index

Providing method chaining

Chaining more than one method is a very useful feature when programming in jQuery. Chaining is possible since most jQuery methods return an object allowing the calling of other methods on the returned object. Since the child methods are executed in the returned object instead of the entire DOM, the code runs faster. This allows you to write code, which is not only shorter but also faster.

The plugin that we have worked with so far does not support chaining. In this example, let's modify the plugin to include this feature.

The programming constructs used in this example are summarized as follows:

Construct	Type	Description
`$`	jQuery function	This refers to the jQuery function. `$` is an alias for jQuery.
`$("#identifier")`	jQuery selector	This selects an element based on its `ID`.
`$(this)`	jQuery object	This refers to the current jQuery object.
`$.extend()`	jQuery function	This merges the contents of two or more objects into the first object.
`.addClass...`

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