Onchange event is not working well

Question

I created a following html page.

<html>
    <head></head>
    <body>
        <input type="text" value="" id="Textbox" onchange="alert('text change');" />
        <input type="button" value="" onclick="document.getElementById('Textbox').value = 'Hello';" />
    </body>
</html>

When the entered text is inputted into the textbox, the onchange event is working well. I wrote a code that when the button is clicked, the 'Hello' text is inputted into the the textbox. But the onchange event of the textbox is not working well. How can I catch change event? Thanks.

score 5 · Answer 1 · edited May 23 '17 at 12:33

Programmatically changing the value doesn't fire a change event, that only occurs if the user focuses the element, changes the value and then puts focus elsewhere.

Options are to manually call the onchange listener, dispatch a change event on the element, or manually bubble the change event by going up the DOM looking for parents with an onchange listener and calling them.

Here is an answer that seems to fit the bill: trigger onchange event manually

Some links:

MDN dispatchEvent (standards compliant): https://developer.mozilla.org/en/DOM/element.dispatchEvent
MSDN fireEvent (IE proprietary): http://msdn.microsoft.com/en-us/library/ie/ms536423(v=vs.85).aspx

score 0 · Answer 2 · answered Jun 27 '12 at 02:32

0

If you want to capture every change use the keydown event. onChange only fire after an input is blurred if I remember correctly.

answered Jun 27 '12 at 02:32

hobberwickey

6,118
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score 0 · Answer 3 · answered Jun 27 '12 at 02:35

0

function codeThatAltersTextFieldProgrammatically() {
    /* ... code ...  */

    textFieldChangeEventHandler();
};

function textFieldChangeEventHandler(){
    /* .... */
}

answered Jun 27 '12 at 02:35

Alex

34,899
5
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score -1 · Answer 4 · answered Jun 27 '12 at 02:31

-1

well currently according to your code, when you get out of the text box the event works,

you need to try OnKeyPress check it here http://jsfiddle.net/EBMyy/

see this code

$(document).ready(function(){
    $("#Textbox").keypress(function(){
        alert("Text Changed");
    });
});

answered Jun 27 '12 at 02:31

mfadel

887
12
32

2

Your answer misses the point and there is no jQuery tag on the question so providing a jQuery specific answer isn't helpful. The OP says that the onchange listener works fine for user input, it's programmatic changes of the value that are the issue. – RobG Jun 27 '12 at 23:20
1

jquery is not the default js framework for web development – gonephishing Jan 29 '17 at 14:20

Onchange event is not working well

4 Answers4

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