Javascript Focus Does Not Work On Dynamically Loaded Input Box

I have a HTML markup in a template which has input element. I load it via Ajax call and put in existing html using jQuery's $(selector).html(response). Basically it is a pop up box

Solution 1:

if you are using jquery then you can use .on() on dynamically generated elements

$("#prescribe-input").on( "focus", function() {
  //do what ever you want
});

Solution 2:

You should do this in the callback function:

$(selector).html(response, function(){
   $("#prescribe-input").focus();
})