How to use jquery and wp_enqueue_script

Question

I´ve spent a good while trying to figure this out. Im trying to add a script that need an external jquerylibrary. I can make it work by inserting my script between scripttags, however i understand thats not the correct way to do it, and it breaks another script on the site.

I spent a fair amount of time tonight trying to figure out how to add the script correct, and i just cant get it.

I understand something like this is the correct way to enqueue the script:

function my_scripts_method() { wp_register_script( 'jquery', 'http://code.jquery.com/jquery-1.9.1.js'); wp_enqueue_script( 'jquery' ); }
add_action('wp_enqueue_scripts', 'my_scripts_method');

My main question is, how do i write my functions so it calls the library, and at the same time failsafe it so it only loads once, and doesnt crash with other scripts? This is the script:

$(document).ready(function () {


$("#menu-item-16").hover(




          function () {
                  $('body').css("background", "#ff9900");
              }, 
              function () {
                $('body').css("background", "#ccc");
             }
            );

            $("#menu-item-17”).hover(
              function () {
                  $('body').css("background", "red");
              }, 
              function () {
                  $('body').css("background", "#ccc");
              }
            );

            $("#menu-item-18”).hover(
              function () {
                  $('body').css("background", "yellow");
              }, 
              function () {
                  $('body').css("background", "#ccc");
              }
            );
        });

Edit:

Second question, several librarys and a stylesheet.

As said above i have a little more complex script that you guys might be able to help me out.

I have this code in the header right now, and it works.

   `<link rel="stylesheet" type="text/css" href="/wp-content/themes/neighborhood/js/jquery.fullPage.css" />

    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>

<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.9.1/jquery-ui.min.js">     </script> 
 <script type="text/javascript" src="/wp-content/themes/neighborhood/js/vendors/jquery.slimscroll.min.js"></script>

<script type="text/javascript" src="/wp-content/themes/neighborhood/js/jquery.fullPage.js"></script>



<script>
 $(document).ready(function() {
$.fn.fullpage({
    verticalCentered: true,
     resize : true,
    slidesColor : ['#AF1700', '#359973', '#F46321', '#A6C7DB'],
    scrollingSpeed: 700,
    easing: 'easeInQuart',
    menu: false,
    navigation: false,
    navigationPosition: 'right',
    navigationTooltips: ['firstSlide', 'secondSlide'],
    slidesNavigation: true,
    slidesNavPosition: 'bottom',
    loopBottom: false,
    loopTop: false,
    loopHorizontal: true,
    autoScrolling: true,
    scrollOverflow: true,
    css3: false,
    paddingTop: '3em',
    paddingBottom: '10px',
    fixedElements: '#element1, .element2',
    normalScrollElements: '#element1, .element2',
    keyboardScrolling: true,
    touchSensitivity: 15,
    continuousVertical: false,
    animateAnchor: false, 
    setScrollingSpeed: 1000,



});
});    

 </script>

`

From my newfound insights, i tried this, and it didnt work:

`

function fullpage() {     wp_enqueue_script('jquery');  

wp_register_style( ’fullpage-css', get_template_directory_uri() . '/js/jquery.fullPage.css','','', 'screen' );   
wp_register_script( 'jquery.1.8.3', get_template_directory_uri() . 'http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js', array('jquery'),'',true  ); 
 wp_register_script( 'jquery.1.9.1', get_template_directory_uri() . 'http://ajax.googleapis.com/ajax/libs/jqueryui/1.9.1/jquery-ui.min.js', array('jquery'),'',true  ); 

 wp_register_script( 'fullpage', get_template_directory_uri() . '/js/jquery.fullPage.js', array('jquery'),'',true  ); 
 wp_register_script( 'fullpagecode', get_template_directory_uri() . '/js/fullpagecode.js', array('jquery'),'',true  ); 
 wp_register_script( 'slimscroll', get_template_directory_uri() . '/js/vendors/jquery.slimscroll.min.js', '', null,''  ); 

wp_enqueue_style( 'fullpage-css' ); // Enqueue our stylesheet

wp_enqueue_script( 'jquery.1.8.3' );  // Enqueue our first script

 wp_enqueue_script( 'jquery.1.9.1' ); // Enqueue our second script

 wp_enqueue_script( 'fullpage' );  // Enqueue our third  script

wp_enqueue_script( 'fullpagecode' ); // Enqueue fourth script

 wp_enqueue_script( ’slimscroll’ ); // Enqueue fifth script

  }add_action( 'wp_enqueue_scripts', ’fullpage’ ); `

Answer 1

Don't run your jquery in a script. This will break other scripts in wordpress.

Make a .js file (eg. example.js and put this in your theme folder under a /js directory) and 'enqueue' it in your functions.php file like this.

function theme_styles() {
    wp_register_style( 'fullpage-css', get_template_directory_uri() . '/css/jquery.fullPage.css' );   
    wp_enqueue_style( 'fullpage-css' ); 
}
add_action('wp_enqueue_scripts', 'theme_styles');

function theme_scripts() {
    wp_register_script( 'fullpage', get_template_directory_uri() . '/js/jquery.fullPage.js', array('jquery'),'1.0.0',true  ); 
    wp_enqueue_script( 'fullpage' );
    wp_register_script( 'fullpagecode', get_template_directory_uri() . '/js/fullpagecode.js', array('jquery'),'1.0.0',true  ); 
    wp_enqueue_script( 'fullpagecode' );
    wp_register_script( 'slimscroll', get_template_directory_uri() . '/js/vendors/jquery.slimscroll.min.js', array('jquery'), null, true  );
    wp_enqueue_script( 'slimscroll' );
}
add_action('wp_enqueue_scripts', 'theme_scripts');

wp_enqueue_script( $handle, $src, $deps, $ver, $in_footer );

$src is the path to the js file. $deps is where you define this script requires jquery, like this. array('jquery')

You don't need to include jquery as wordpress has this built in.

Then in your .js file in your theme folder wrap your code in a No Conflict wrapper. Using $() will return undefined otherwise.

jQuery(document).ready(function($) {

    $("#menu-item-16").hover(
          function () {
                  $('body').css("background", "#ff9900");
          }, 
          function () {
            $('body').css("background", "#ccc");
         }
    );

    $("#menu-item-17").hover(
        function () {
          $('body').css("background", "red");
        }, 
        function () {
          $('body').css("background", "#ccc");
        }
    );

    $("#menu-item-18").hover(
        function () {
          $('body').css("background", "yellow");
        }, 
        function () {
          $('body').css("background", "#ccc");
        }
    );

});