How do I add Javascript to every non-admin page in Wordpress?

Question

I have a plugin that I previously was only needing to load Javascript on content pages. In other words, the code add_filter('the_content', 'insert_js'); was sufficient. Now I'd like the Javascript to be inserted to every page that isn't an admin page or a search result page and I was wondering if there was a shortcut filter name for that or if I have to list all the filters. I also only want the Javascript to be added to the page once. If I have to add a few add_filter() lines, that's fine, but I am still unsure of what they need to be. I consulted the Plugin API/Filter Reference documentation ( http://codex.wordpress.org/Plugin_API/Filter_Reference ) and that seemed ambiguous. I also tried using the_category amongst others to no avail. I am also trying to figure out how to get the Javascript to load on the homepage. The Javascript I am including is not static and needs to be generated based on some WP specific attributes known at runtime (like URL). Any help would be appreciated. Thanks.

Answer 1

Use add_action to add script to specific hook. Generally wp_head used to add script to head section and wp_footer is used to add script at footer section. Check following code:

<?php

function add_this_script_footer(){ ?>
    <script type="text/javascript">
        [YOUR JS CODE HERE]
    </script>
<?php } 

add_action('wp_footer', 'add_this_script_footer'); ?>

Or you can use wp_enqueue_script() to add external script like following:

<?php
function my_scripts_method() {
  wp_enqueue_script(
    'custom-script', // handle
    get_template_directory_uri() . '/js/custom_script.js', // src
    array( 'jquery' ) // dependencies
  );
}

add_action( 'wp_enqueue_scripts', 'my_scripts_method' );
?>

You can find more details about wp_enqueue_scripts on http://codex.wordpress.org/Function_Reference/wp_enqueue_script

Answer 2

Further to @itskawsar's answer; you can wrap the wp_enqueue_script() functions in a conditional to make sure they only load on non-admin pages:

<?php
function my_scripts_method() {
    if (!is_admin()) {
        wp_enqueue_script(
        'custom-script', // handle
        get_template_directory_uri() . '/js/custom_script.js', // src
        array( 'jquery' ) // dependencies   
        );
    }
}

add_action( 'wp_enqueue_scripts', 'my_scripts_method' );
?>