Add JavaScript to wp-admin thought functions.php
function admin_inline_js(){ echo "<script type='text/javascript'>"; echo 'alert("Hello")'; echo "</script>"; } add_action( 'admin_print_scripts', 'admin_inline_js' );
function admin_inline_js(){ echo "<script type='text/javascript'>"; echo 'alert("Hello")'; echo "</script>"; } add_action( 'admin_print_scripts', 'admin_inline_js' );