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I have a custom jquery-based slider on homepage of a WordPress site. I'm loading jQuery (jquery.js) and the slider js (jquery.advanced-slider.js) using below code in my functions.php file of my theme.
function my_load_scripts() {
if (!is_admin()) {
wp_enqueue_script("jquery");
if (is_home()) {
wp_enqueue_script('theme-advanced-slider', get_template_directory_uri().'/js/jquery.advanced-slider.js', array('jquery'));
wp_enqueue_script('theme-innerfade', get_template_directory_uri().'/js/innerfade.js', array('jquery'));
}
}
}
add_action('wp_enqueue_scripts', 'my_load_scripts');
Now I put the below code in my header.php file BEFORE wp_head();
<script type="text/javascript">
var $j = jQuery.noConflict();
$j(document).ready(function () {
//Slider init JS
$j(".advanced-slider").advancedSlider({
width: 614,
height: 297,
delay: 1000,
pauseRollOver: true
});
});
</script>
It's obvious here that my jquery.js and jquery.advanced-slider.js load after the JavaScript code above and thus my slider doesn't work. If I put it after wp_head() call in <head> the slider works.
But if I put it after wp_head() wouldn't that be a hack? I want my code to be clean. As twentyeleven theme clearly says
/* Always have wp_head() just before the closing </head>
* tag of your theme, or you will break many plugins, which
* generally use this hook to add elements to <head> such
* as styles, scripts, and meta tags.
*/
I'm very confused here. I might be missing something very simple clue here. But help me out guys. What would be the best way to put the JavaScript before wp_head() and yet have it load after jquery.js and slider.js have loaded?
An easier - but maybe not so nice - hack is to simply add a 1-millisecond timeout
The code that you are adding to the bottom of the page should be externalized to it's own file and added with the
wp_enqueue_script();function like shown below.Note the use of the 'true' directive at the end of each call to wp_enqueue_script. That tells WordPress that you want them included at the
wp_footer();hook (instead of thewp_head();hook) which should appear directly before the closing</body>tag - as per the performance best practices that others have mentioned.I've removed the jQuery enqueue line you had included because you shouldn't need to register the jQuery script as it's already registered by the WP core and since you have defined it as one of the dependencies it will be included for you.
Since you have wrapped it all in an
is_home()conditional statement the all 3 of these files - plus jQuery - will be included in just the homepage.Wait for loading jQuery with
window.onloadfunction, oncejQueryfile and other js / content loaded thenwindow.onloadfunction will be fire.Add your script block to the bottom of the HTML page, just before the
</body>.Your slider init JS code won't get executed until the full DOM has been parsed in the browser anyway so there is no disadvantage to this.
In fact web performance experts like Steve Souders suggest that script blocks should be added at the end of your HTML page as script blocks block rendering and the page appears to load faster this way.
As per wordpress function reference:
If you want to keep your "code clean" you might rethink how your js is organised. My approach with wordpress is to (usually) keep a scripts.js for all initialisation and small scripts and separate file(s) for plugins. But everything depends how big and how many files you have - you want to avoid too many http requests and files that are hard to manage.
As well, wp_enqueue_script lets you place the scripts in the footer. http://codex.wordpress.org/Function_Reference/wp_enqueue_script