value of the deletion input on click

Question

I have this code in javascript which I pass values to inputs. When I use this code it inserts the data into input usually but when I do one click after passing the values the input automatically delete the entered value. If I replace this.getAttribute('data-email') by a string for example: user_email = "abc" the value is passed to mine input but it’s not erased when I do click. how do I pass the value so that it is not deleted?

$('.userEdit').click(function() {
  var user_email = this.getAttribute('data-email');
  var user_type = this.getAttribute('data-type');
  var user_function = this.getAttribute('data-function');

  function myFunc(elem, val) {
    return document.getElementById(elem).value = val;
  }
  myFunc("edit_form_user_email", user_email);


});