In this post, you will learn how to insert Javascript onto your WordPress pages or posts to achieve the dynamic functionalities on the website.
What is Javascript?
JS, an acronym for JavaScript, is one of the most popular client-side programming languages. Developers use it to implement interactive features on websites.
Given that it is a client-side language, Javascript enables you to implement interactive and dynamic features on your website even after your page finishes loading.
On the other hand, WordPress is coded in PHP, a server-side language. That means the server processes your website code before displaying it to users.
Therefore, using Javascript opens up new options for your website.
Can you use Javascript on WordPress sites?
In short, yes, you can! In fact, combining the powers of Javascript with WordPress gives you the best of both worlds.
Once you get familiar with how you can implement custom Javascript on your WordPress site, you can look into enhancing the efficiency of your code and achieving the customization that you want.
In fact, many WordPress plugins and WordPress themes use JavaScript to power their functionality.
What can JavaScript do for WordPress sites?
Typically, the WordPress editor both autoformats your text and restricts the types of tags you can insert into your content. While some users who are attempting to insert custom scripts find this frustrating, it’s not a design flaw. Blocking the ability to insert scripts is a security feature.
The purpose of a content management system (CMS) like WordPress is to separate content from design. Ensuring that the administrator sets formatting and layout options at the theme level prevents the WordPress site’s authors from modifying the design.
With JavaScript, you can apply styling, layout, and content changes outside the boundaries of the page or post you are authoring. In fact, there would be no restrictions on uploading malicious scripts by your authors.
While this is a good restriction for the average author, there are valid reasons to add JavaScript to specific pages or posts:
- Analytics: most analytics and tracking services would need you to add a Javascript code snippet onto your website. Some examples include Google Analytics, Facebook Pixels, and so on.
- Players: Some audio and video players require a script to display the player within the page.
- Interactive pages: Interactive pages and calculators require the embedding of third-party scripts within a site. You can also add live chat widgets.
- Third-party forms: Subscription and lead generation forms often have remotely loaded scripts that need to be included in the header, body or footer of the page. This allows you to include email marketing opt-in forms or contact forms on your website.
Method 1: Disable WordPress filtering of script tags
If you trust that your authors won’t get themselves into trouble, you can disable the blocking of script tags from within JavaScript. In wp-config.php within your root web directory, you’ll need to enable custom tags by adding the following line of code:
define( 'CUSTOM_TAGS', true );
Within your functions.php page, you can add the following code:
function add_scriptfilter( $string ) {
global $allowedtags;
$allowedtags['script'] = array( 'src' => array () );
return $string;
}
add_filter( 'pre_kses', 'add_scriptfilter' );
Note: Once again, we have to warn against using the above method. Enabling the script tag via this method disables the security feature sitewide for any user permission level.
Method 2: Use a WordPress plugin to enable script includes
There are plenty of plugins out there for managing JavaScript within your pages or posts. At times, you will need to load your JavaScript within the <head> tags of the page or after your content adjacent to your </body> tag.
Sometimes you may wish to load JavaScript sitewide; other times specific to a single page or post. After testing many of the plugins, the most comprehensive plugin we found was Scripts n Styles.
The plugin allows you to include scripts at a global level, sitewide.
Here are some of the best WordPress free plugins for JavaScript management:
- WPCode – previously known as Insert Headers and Footers
- Simple Custom CSS and JS
- Header Footer Code Management
Method 3: Use Advanced Custom Fields
Advanced Custom Fields is a widely used plugin that allows you to implement custom fields without having to develop a ton of custom code.
With more than 1 million installations, Advanced Custom Fields is a proven, well-developed,and well-supported plugin.
Install and activate the plugin and you will have a new menu option in your Administrative menu called “Custom Fields.”
The Advanced Custom Fields option offers quite a bit of functionality. You may want to define your rules specific to certain users, published pages, or page templates rather than Administrators and all posts and pages. We’d highly recommend narrowing down access to adding scripts to only the pages, posts and users that they are required for.
Once you add JavaScript to WordPress, it opens up a lot of flexibility for your site. From analytics and tracking scripts to interactive features, you can now add them with ease onto your WordPress website.
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