6

I am trying to have some functionality on change of a textbox which is readonly. But when I am trying to update the textbox using javascript, the change event is not firing for the textbox.

<script type="text/javascript">
        $(document).ready(function () {
            $('input[id$=_txtTest]').bind("change", function () {
                alert("test");
            });
                        });
        function ChangeText() {
            $('input[id$=_txtTest]').val('hello');
         }
    </script>

I am calling ChangeText method on click of a button. But it is not firing the textchange event for the textbox.

Can anybody tell me what is wrong here?

Ashwani K
  • 7,880
  • 19
  • 63
  • 102

5 Answers5

9

Well you have to do this way: http://jsfiddle.net/kmvSV/1/

 $(document).ready(function () {
   $('input[id$=_txtTest]').bind("change", function () {
     alert($(this).val());
   });
   $('button').bind("click", function () {
     $('input[id$=_txtTest]').val('hello').trigger('change');
   });
 });
Jai
  • 74,255
  • 12
  • 74
  • 103
4

The change event is triggered by real user events only, not javascript actions.

You may trigger the change event, like so:

$('input[id$=_txtTest]').val('hello').change();
Christiaan Westerbeek
  • 10,619
  • 13
  • 64
  • 89
2

you can do like this

function setValueOfTextBox()
{
    var myElement = document.getElementById("textboxid");
    myElement.value = "hello";
    //following code fire change event for you text box
    if (myElement.onchange) 
         myElement.onchange();
}
Pranay Rana
  • 175,020
  • 35
  • 237
  • 263
0

I believe that for some security reason, the events are not fired. But you can achieve this by triggering the specific event on that element. E.g. $('input[id$=_txtTest]').trigger('change');

I hope this helps someone.

jking
  • 194
  • 2
  • 9
0

onkeypress event or one of the several other events:

Since the read-only field doesn't really change; the onChange event doesn't trigger on it. However; there are several other events that you can listen to.

Here's a short demo:

input {
  font-size: 16px;
  line-height: 30px;
  padding: 3px;
  border: 2px darkblue solid;
}
<script>
function sayHi(evt) {

  alert('Are you tyring to edit a read-only? Click OK for details.')
  alert(JSON.stringify({
    keyCode: evt.keyCode, 
    charCode: evt.charCode, 
    altKey:evt.altKey, 
    ctrlKey: evt.ctrlKey, 
    shiftKey: 
    evt.shiftKey
  }), null, 2);
}
</script>



<input onkeypress="sayHi(event);" readonly placeholder="A readonly field..." />
Aakash
  • 21,375
  • 7
  • 100
  • 81