473,786 Members | 2,405 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

OnChange & Hidden form element

Is there any way you can trigger a function when the
value of a hidden form element is changed?

thnx,
Christoph
Jul 23 '05 #1
2 15628
Christoph wrote:
Is there any way you can trigger a function when the
value of a hidden form element is changed?


Events are only triggered by users. There is no way for a user to change the
content of a hidden field. Only a script can do this. Have that script fire
off whatever other functions you want.

--
David Dorward <http://blog.dorward.me .uk/> <http://dorward.me.uk/>
Home is where the ~/.bashrc is
Jul 23 '05 #2
Christoph wrote:
Is there any way you can trigger a function when the
value of a hidden form element is changed?

thnx,
Christoph


The only way that seems to work is via the onpropertychang e event
handler:

<input type="hidden".. ...onpropertych ange="alert('ch anged')" />

....which is IE-only afaik. The entire concept of a 'change' event for a
hidden field is a bit shaky, as a change equals a value change followed
by a blur - and blur/focus for hidden fields is a seemingly invalid
concept. Since you can only change hidden fields programmaticall y
(script), presumably as the programmer you'd already know when you (as
opposed to a user) had changed the value...

Jul 23 '05 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

1
20701
by: Covad | last post by:
Hi all, For some reason my change() function is only called when the page loads. I'd much rather it gets called when the select changes. Here's the code: window.onload = init; function init() {
3
5760
by: Lee Mundie | last post by:
Hi there, Simple problem here but can't seem to fix it! Okay, I have a select list from which people choose avatars... the list is option values ie. <option>Worm</option> <option>Frog</option> etc etc and is in an include file... where the word i.e. worm sources the image ..images/worm.gif - simple so far...
5
14552
by: Good Man | last post by:
Hi there I'm adding form fields on the fly with some javascript DOM programming. I basically just clone a hidden <div>, then adjust node properties to make this new <div> have unique values (style, size, etc.) the original code of the input tag is: <input type="file" onchange="alert('original')" size="30" id="filea" name="filea">
2
22284
by: a10392 | last post by:
Hi, I'am triyng to create a form where i have 2 comboBox and 2 textbox, when the selection changes on the first combo , the content of second also changes. i have to use onchange=form.submit() the problem is, i want to have a button to finish the selection and save all the data to a database, but if i have diferent forms, i will not get the last change on the text boxs, only th last change when i changed the combobox. Using the same...
1
5021
by: Jan Doggen | last post by:
Hello all, I have a SELECT like this (the 'alert()s are temporary): <FORM method="POST" action="/scripts/runisa.dll?OVB2.132964:PGSPLITVACAFMELDEN:1095144287.9159" id="hulpform" name="hulpform"> <select name="varVervuld" id="varVervuld" onChange="alert('Onchange');Vervuld(this.options);"> <option value="0" selected="selected">&nbsp;</option> <option value=JA>Ja</option>
6
4355
by: Daz | last post by:
Hi everyone. Firstly, I apologise if this i not what you would call a PHP problem. I get quite confused as to what lives in which realm, so if this shouldn't be posted here, please suggest where I should post it. I have created a form, which consists of a list of items, each with a checkbox. When a checkbox is checked or unchecked, the page should be refreshed. During the refresh, the data is validated and the MySQL database is...
14
9265
by: The Natural Philosopher | last post by:
This is a nasty one and I can't see my way out of it. I have a bunch of select statements in a form, and each select statement has an onchange="do_something(this)" in it, and this works nicely..except when there is only ONE OPTION in a given select. It seems you cannot 'onchange' a single option! Well, that is reasonable. The trouble is I have no way of selecting it since the form itself is a
1
4223
by: littlealex | last post by:
IE6 not displaying text correctly - IE 7 & Firefox 3 are fine! Need some help with this as fairly new to CSS! In IE6 the text for the following page doesn't display properly - rather than being aligned to the top, along with the slideshow and link buttons, you have to scroll down to see the text - how can I make IE6 display correctly? http://geekarama.co.uk/new_home.html here is the code for new_home.html and following that the CSS...
15
3078
by: colyn7 | last post by:
I really can't see what's wrong in my code... the submit() onChange doesn't work.. I've tried.. <select name="ddlTestCenter" id="ddlTestCenter" style="width:180px" onChange="this.form.submit();"> it doesn't work... <input type="hidden" name="hiddenopt" value="secret"> <select name="list" onChange="document.forms.submit();">
0
10360
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
0
10163
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
10108
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
8988
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
0
5397
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
0
5532
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
4064
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
3668
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
2894
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.