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I have some code like the following:

<html>
    <body>
        <div id="product_descriptioncontent">
            <input type="text" id="a" />
            <textarea id="b" />
        </div>
    </body>
<html>

That means, my div contains either inputs, text areas or images. But my question is how to detect the changes when any children value changed in a div?

I have some code like the following:

<html>
    <body>
        <div id="product_descriptioncontent">
            <input type="text" id="a" />
            <textarea id="b" />
        </div>
    </body>
<html>

That means, my div contains either inputs, text areas or images. But my question is how to detect the changes when any children value changed in a div?

  • javascript
  • jquery
  • html
Share Improve this question edited Oct 28, 2012 at 22:28 Bart 20k8 gold badges71 silver badges79 bronze badges asked Jun 6, 2012 at 7:52 ArunaAruna 1031 gold badge2 silver badges9 bronze badges 2
  • Do you mean detecting changes for images also? – VisioN Commented Jun 6, 2012 at 8:20
  • This strategy of using a Mutation Observer worked for me. stackoverflow./a/20156615/3416155 – Gibado Commented Nov 9, 2023 at 16:48
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4 Answers 4

Reset to default 3

The onchange event only fires when the element loses focus, that is, when it blurs with a different value than when it gained focus.

I'm not aware of any native listener that would provide such functionality in real time, but you could try maneuvering jQuery's .data() method to store the current value and check against it in a standard keyboard event, such as keyup:

$('#product_descriptioncontent').children().each(function() {
    $(this).on('keyup', function() {
        if ($(this).data('c_val') != $(this).val()) {
            alert('value changed!');
            //do other stuff
        }
        $(this).data('c_val', $(this).val());
    }).data('c_val', $(this).val());
});​​

JSFiddle

Note that you may also remap the keyup to multiple events for extra checks: 

$(this).on('keyup mouseup blur', function(){

As well as simply calling $('#element').keyup() will trigger the on function for that element, if you ever need to call it without the user inputting anything. =]

Note that the .on() jQuery method is only supported in jQuery 1.7+, for older versions you should use .live().

You can do something like this:

$('#a, #b').on('change', function() {
   $('#product_descriptioncontent').css('border', '1px solid green')
});

You can also do it by binding the HTML5 input event for the children elements. That doesn't work for IE versions less than 9, but, in these cases, you can use the propertychange event. The below code does both and because IE9 can handle both, we unbind the propertychange event in the case of IE9 since better to use the standard input event.

$(document).ready(function() {
    var propertyChangeUnbound = false;
    $("#product_descriptioncontent").children().bind("propertychange", function(e) {
        if (e.originalEvent.propertyName == "value") {
            alert("Value changed!");
            //do other stuff
        }
    });

    $("#product_descriptioncontent").children().bind("input", function() {
        if (!propertyChangeUnbound) {
            $("#product_descriptioncontent").unbind("propertychange");
            propertyChangeUnbound = true;
        }
        alert("Value changed!");
        //do other stuff
    });
});

Here is a jsfiddle link: http://jsfiddle/yNxaW/

This is, in part, based on the answer to another stackoverflow question: Catch only keypresses that change input?

You can add an onchange event listener.

<html>
    <body>
        <div id="product_descriptioncontent">
            <input onchange="somefunction(this)" type="text" id="a" />
            <textarea onchange="somefunction(this)" id="b" />
        </div>
    </body>
<html>

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