Hello dear readers! Welcome back to another edition of our tutorial on jQuery. In this tutorial guide, we are going to be introducing the jQuery plugins to you guys.
A plug-in is a piece of code that is written in standard JavaScript file. These files provides useful jQuery methods which can be used along with jQuery library methods.
There are many jQuery plugin that are made available which can be downloaded from the jQuery plug-in web site Registry.
A plug-in is a piece of code that is written in standard JavaScript file. These files provides useful jQuery methods which can be used along with jQuery library methods.
There are many jQuery plugin that are made available which can be downloaded from the jQuery plug-in web site Registry.
How to use Plugins
In order to make a jQuery plug-in method available to us, we include plug-in file similar to jQuery library file in the <head> of the document.
We must always ensure it appears after the main jQuery source file, and before our custom JavaScript code.
We must always ensure it appears after the main jQuery source file, and before our custom JavaScript code.
Example
The following example shows how to include jquery.plug-in.js plugin -
<html lang = "en">
<head>
<title>JQuery Example</title>
<script type = "text/javascript"
src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js">
</script>
<script type = "text/javascript" src = "jquery.plug-in.js">
</script>
<script type = "text/javascript" src = "custom.js">
</script>
<script type = "text/javascript">
$( document ).ready( function( ) {
........Your custom code.....
} );
</script>
</head>
<body>
................................................
</body>
</html>
<head>
<title>JQuery Example</title>
<script type = "text/javascript"
src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js">
</script>
<script type = "text/javascript" src = "jquery.plug-in.js">
</script>
<script type = "text/javascript" src = "custom.js">
</script>
<script type = "text/javascript">
$( document ).ready( function( ) {
........Your custom code.....
} );
</script>
</head>
<body>
................................................
</body>
</html>
RECOMMENDED POST: JQuery Utility Methods
How to Develop a Plug-in
It is very simple to write your own plug-in.
Syntax
Below is the syntax for creating a jQuery plug-in method -
jQuery.fn.methodName = methodDefinition;
Here methodName in the above syntax is the name of the new method and methodDefinition is the actual method definition.
The guide line recommended by jQuery team is as follows -
The guide line recommended by jQuery team is as follows -
- Any method or function you add must have a semicolon ( ; ) at the end.
- Your method must return a jQuery object unless if noted otherwise.
- You should use this.each to iterate over current matched set of elements. It results to a clean and compatible code that way.
- You have to always prefix the filename with jquery, follow that with the name of the plugin and round up with .js.
- Always attach the plugin to the jQuery directly, instead of $, so users can make use of the custom alias through the noConflict( ) method.
RECOMMENDED POST: Learn JQuery Widgets - Complete List
For example, if we write a plugin that we want to name debug, then our JavaScript filename for this plugin would be -
jquery.debug.js
The use of the jquery. prefix gets rid of any possible name collisions with files intended for use with other libraries.
Example
Following is a small plug-in to have the warning method for debugging purpose. Make sure to keep this code in the jquery.debug.js file -
jquery.fn.warning = function( ) {
return this.each( function( ) {
alert( 'Tag Name:" ' + $( this ).prop( "tagName" ) + ' ". ' );
} );
} );
return this.each( function( ) {
alert( 'Tag Name:" ' + $( this ).prop( "tagName" ) + ' ". ' );
} );
} );
Below is an example showing the usage of the warning() method. If we put jquery.debug.js file in the same directory with the html page -
<html lang = "en">
<head>
<title>JQuery Example</title>
<script type = "text/javascript"
src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js">
</script>
<script type = "text/javascript" src = "jquery.debug.js">
</script>
<script type = "text/javascript">
$( document ).ready( function( ) {
$( "div" ).warning( );
$( "p" ).warning( );
} );
</script>
</head>
<body>
<p>This is a paragraph</p>
<div>This is a division</div>
</body>
</html>
<head>
<title>JQuery Example</title>
<script type = "text/javascript"
src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js">
</script>
<script type = "text/javascript" src = "jquery.debug.js">
</script>
<script type = "text/javascript">
$( document ).ready( function( ) {
$( "div" ).warning( );
$( "p" ).warning( );
} );
</script>
</head>
<body>
<p>This is a paragraph</p>
<div>This is a division</div>
</body>
</html>
Output
Below is the output of the above example -
This is a paragraph
This is a division
This is a division
RECOMMENDED: JQuery UI Widgets Tutorial
Alright guys! this is where we are rounding up with this tutorial on jQuery plugins. In our next tutorial, we will be discussing about the jquery PagePiling.js plug-in. If this tutorial was in any way helpful to you, then you can make use of the share button to share this tutorial.
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Thanks for reading and bye for now.
Do feel free to ask your questions where necessary and i will attend to them as soon as possible.
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Thanks for reading and bye for now.