ajax call in wordpress front end

You have to localize script by using wp_localize_script function. In the admin side ajaxurl is already available. But in front end you have to localize script to define ajaxurl.

Example:

wp_enqueue_script( 'custom-ajax-request', '/path/to/settings.js', array( 'jquery' ) );
wp_localize_script( 'custom-ajax-request', 'MyAjax', array( 'ajaxurl' => admin_url( 'admin-ajax.php' ) ) );

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