Load snippet on WP backend – admin

‘Run snippet everywhere’ doesn’t place any restrictions on where the snippet runs on your site.

If it looks like your code is not running on the back-end, it’s because your code doesn’t affect the back-end. A common mistake here is using wp_head instead of admin_head when adding CSS/JS.

I am using the following code in the snippet field:

function hide_checkbox_li() {
if ( is_page ( array( '140', '141' ) ) ) {
?>

<script type="text/javascript">

jQuery code here

</script>

<?php
}
}

add_action('wp_footer', 'hide_checkbox_li', 100);
add_action('admin_head', 'hide_checkbox_li', 10);

I want the code to run on frontend only for pages with ID’s 140 and 141 as well as WP backend. Adding an additional add_filter function will this be correct and secure?

Thank you

• This reply was modified 2 years, 11 months ago by pickme.

If you want to load the code in the footer, you can use admin_footer instead of admin_head.

The problem is that your is_page() check is restricting the code to the front-end. Adding in an is_admin() check separated by the OR || operator will allow it to run in both environments:

function hide_checkbox_li() {
	if ( is_admin() || is_page( array( '140', '141' ) ) ) {
		?>

		<script type="text/javascript">

			//jQuery code here

		</script>

		<?php
	}
}

add_action( 'wp_footer', 'hide_checkbox_li', 100 );
add_action( 'admin_head', 'hide_checkbox_li', 10 );

Perfect!

I will use admin_footer for the code to be placed at bottom of page to speedup loading of wp backend.

I tested and works! ??

I was checking WordPress Code Reference for this solution since I noticed that the code cannot run on both environments when using is_page.

Today I read this article about is_admin

https://dev.to/lucagrandicelli/why-isadmin-is-totally-unsafe-for-your-wordpress-development-1le1

Could you please let me know if using is_admin will make wordpress insecure?

Thank you very much for your help @bungeshea !

• This reply was modified 2 years, 11 months ago by pickme.

No, the advice in that article does not apply here, because you are just using is_admin() to determine whether to output some content in a particular part of your site.

The article you linked it specifically talking about using is_admin() for security checks, e.g. to check whether a user has administrator permissions, which is not what we are doing.

That’s what I thought but I was not completely sure!

Thanks a lot for your help and clarifying this @bungeshea ??

• This reply was modified 2 years, 11 months ago by pickme.