How to define WordPress ajaxurl which is only defined in the admin section.
add_action('wp_head', 'my_custom_plugin_ajaxurl_fix');

/**
* The ajaxurl is only defined in the admin section
*/
function my_custom_plugin_ajaxurl_fix() {
$url = admin_url('admin-ajax.php');

echo <<<EOF_BUFF
<script type="text/javascript">var ajaxurl = '$url';</script>
EOF_BUFF;
}

 

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