jquery - I set field value w javascript, onchange not triggered. Alternative solution? - Stack Overflow

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I have read some solutions to this, none of which are hassle free, so I thought maybe some modern solution now exist to remedy this. It should anyways, since the problem has been around for a while. Something in the more recent jQuery updates perhaaps?

I set my form field like this:

parent.window.document.getElementById(parent.window.imageInputField).value = '{{ path }}'+image;

and I have an onchange event like this that I would like to fire upon my field update as of above.

$('#data_1').change(function(){
img = "url(" + $('#data_1').val() + ")"
$('#slide_bg').css("backgroundImage", img );
});

---

UPDATE

so this code works fine:

alert( $('#'+parent.window.imageInputField, window.parent.document).val() );

while this doesn't do anything, no error or nothing

$('#'+parent.window.imageInputField, window.parent.document).change();

The change event is defined here

$('#data_1').change(function(){
alert('change event called');
img = "url(" + $('#data_1').val() + ")"
$('#slide_bg').css("backgroundImage", img );
});

and this works perfect:

<input type='button' value='Uppdatera förhandsgr.' onclick="$('#data_1').change()" />

All I want is to trigger what this button does, but by code... anyone see where I went wrong?

I have read some solutions to this, none of which are hassle free, so I thought maybe some modern solution now exist to remedy this. It should anyways, since the problem has been around for a while. Something in the more recent jQuery updates perhaaps?

I set my form field like this:

parent.window.document.getElementById(parent.window.imageInputField).value = '{{ path }}'+image;

and I have an onchange event like this that I would like to fire upon my field update as of above.

$('#data_1').change(function(){
img = "url(" + $('#data_1').val() + ")"
$('#slide_bg').css("backgroundImage", img );
});

---

UPDATE

so this code works fine:

alert( $('#'+parent.window.imageInputField, window.parent.document).val() );

while this doesn't do anything, no error or nothing

$('#'+parent.window.imageInputField, window.parent.document).change();

The change event is defined here

$('#data_1').change(function(){
alert('change event called');
img = "url(" + $('#data_1').val() + ")"
$('#slide_bg').css("backgroundImage", img );
});

and this works perfect:

<input type='button' value='Uppdatera förhandsgr.' onclick="$('#data_1').change()" />

All I want is to trigger what this button does, but by code... anyone see where I went wrong?

• javascript
• jquery
• forms
• onupdate

Share Improve this question Follow edited Dec 31, 2012 at 18:31 Matt Welander asked Dec 29, 2012 at 19:39 Matt WelanderMatt Welander 8,5582525 gold badges9696 silver badges146146 bronze badges 2

• I don't understand, you are looking for an onChangeProperty event? – HMarioD Commented Dec 29, 2012 at 19:43
• Yes, that fires when I javascript-programattically change the contents of an input field (the onchange event only fires when the user puts the cursor in the field, updates the contents and blurs from the field. – Matt Welander Commented Dec 29, 2012 at 20:36

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1 Answer 1

Sorted by: Reset to default 6

you need to trigger the change handler with your code. Updating a value with script will not trigger change event

parent.window.document.getElementById(parent.window.imageInputField).value = '{{ path }}'+image;
$('#data_1').change()

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