How to add jQuery script to an individual page?

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Although @s_ha_dum is correct you WILL need to use jQuery no conflict within WordPress the original question is left unanswered.

I have this code which I want to add into a specific page of mine.

There are a couple of ways to do this

Based on Page name/slug WordPress in theme’s functions.php

This method uses the WordPress hook wp_enqueue_scripts

  1. Create a new js file for your script my-nifty-custom.js

  2. In your functions.php add the following

    /* Enqueue scripts (and related stylesheets) */
    add_action( 'wp_enqueue_scripts', 'my_nifty_scripts' );
/**
 * Registers scripts for the theme and enqueue those used site wide.
 *
 * @since 0.1.0.
 */

function my_nifty_scripts() {
    wp_register_script('my-nifty-custom', get_stylesheet_directory_uri() . '/js/my-nifty-custom.js', false, null, true);
if(is_page('page-slug-here')){
    wp_enqueue_script('my-nifty-custom'); 
}}

Note if you are using a child-theme or want to do it morebetter wrap the whole thing in after_setup_theme ie:

add_action( 'after_setup_theme', 'nifty_theme_setup' );
function nifty_theme_setup() {
// script function and other functions that should happen after the initial theme setup
}

Based on Body Class (DOM-based Routing)

This is a little bit more complicated. Luckily Paul Irish wrote a fantastic blog about it here: http://www.paulirish.com/2009/markup-based-unobtrusive-comprehensive-dom-ready-execution/

If you use this method it will get your custom JS on a per page basis based on the Body Class. For Example <body class="nifty">

Then you would use:

//clip 
 nifty : {
    init     : function(){ //custom script goes here }
  }
//clip

The only problem with this is the page must have the body class you are calling. For this WordPress has the function body_class

add_filter('body_class','nifty_class_names');
function nifty_class_names($classes) {
    if(is_page('page-slug-here')){
        $classes[] = 'nifty';
    }

    return $classes;
}

So which method should you use?

I recommend a combination of both. Create one JavaScript file that uses Paul’s method. Then use wp_enqueue_scripts to call that method.

Lazy header.php method

Lastly there IS always the lazy way (which I don’t recommend but am noting just for reference.

In your header.php you can do:

 <?php if(is_page('page-slug-here')){
           echo ('<script type="text/javascript" src="'. get_stylesheet_directory_uri() . '/js/my-nifty-custom.js"> </script>'); 
        } ?>

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