How to add JavaScript to admin page

Hi,

I would like to add a JavaScript code to admin page only. I didn’t find any option for it. I am able to add JS code to frontend only.

For example:

var oldVal = "";
$("#textarea").on("change keyup paste", function() {
var currentVal = $(this).val();
if(currentVal == oldVal) {
return; //check to prevent multiple simultaneous triggers
}

oldVal = currentVal;
//action to be performed on textarea changed
alert("changed!");

});

Could you help me how to add this code to admin page? What and how can I do this?

• This topic was modified 1 day, 8 hours ago by whanklee.