Simple Way To Check If Form Elements Have Changed
Oct 12, 2007
I have a form with many fields... the fields are getting values from a
database.
I've tried onunload to just submit the form regardless of changes or
not but onunload and submit isn't working for me. Now I need some
type of event that will fire when a user tries to navigate from a page
to check to see if anything has changed and if so prompt them
(confirmation) to take action or not.
I know that the reset button only takes away anything that was added
to fields after the load so there must be some way to use the logic of
reset to simply check to see if fields have changed, right?
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Apr 30, 2006
How do you detect that a form element has been changed? This thread:
http://groups.google.com/group/comp...25a82c9be127790
suggests that you attach onChange event handlers to every form element,
and when the handler fires you update a global 'isChanged' variable.
This technique seems to be a bit messy to me (I have many form
elements), I was thinking about storing the original form object in a
javascript variable when the body loads (in the bodie's onLoad event
handler), and upons submission, doing a javascript equality comparison
with the current form object. If nothing has changed, then the two
objects should be equal, right?
if(oldObject == document.getElementById('form'))
{
alert('has changed!');
}
Would this work?
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Sep 11, 2003
I would like to do a simple check if a radio box has been selected.
The form doesn't select any radio box by default, because I don't want to influence the users choice or let them submit the box at all without doing anything.
The form is a simple 5 star rating which means there are 5 radio boxes and a submi button.
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Apr 10, 2011
I have a form that is a regular form but in some cases it might be empty.
<form id="myform"></form>
or it might have some elements
<form id="myform"><input name="X" value="X" /><input name="Y" value="Y" /></form>
What is the proper way to count or check if the form has say inputs, select, textarea, etc..., or check if it's empty?
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May 12, 2011
I have an array of list boxes. I need them to become disabled if the first one is checked (with an id of disabler_0), and I need them to be enabled if that box is unchecked. Right now it doesn't work.
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.0/jquery.min.js"></script>
<script>
[Code]....
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May 24, 2010
I have a textbox, which has a default value and a button in my page.
In the button onclick event, i want to check if the value in the textbox has changed.
How to check if the textbox value has been changed in the button onclick event?
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Jan 17, 2006
'When my form is submitted, I have onsubmit pointed to the following
code snippet. But, the button is not actually set to disabled and the
style.visibility changes are not made for several seconds. It appears
that it goes into validateForm and doing the rest of this snippet
before the browser makes the changes.
How can I get the browser to immediately make the UI change?
function submitForm(servleturl) {
var submitbuttonelem = document.getElementById("submit");
submitbuttonelem.disabled = true;
document.getElementById("modgradeform").style.visibility="hidden";
var mydiv = document.getElementById("contentarea");
mydiv.innerHTML = "Validating the form.";
mydiv.style.visibility="visible";
var ret = validateForm();
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Aug 31, 2009
Heres my code:
<html>
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Oct 19, 2011
Tired to see what's wrong here!
<script>
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May 9, 2010
I have a large form. The submit button doesn't work if the data to be posted back is too long.
1. How to send only MODIFIED fields back?
2. What's the max len of the data I can sent back using post method? Does it depend on browser?
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May 10, 2011
I want to highlight the submit button (change css class) as soon as the form was changed. How would you do this?
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Sep 1, 2010
I am trying to validate a form with a couple of elements being required if a checkbox is NOT checked. Now if I submit the form the rules fire - and then I check the checkbox on - the validation rules have already fired - and even though the checkbox is now checked - the validation rules still apply and the form will not submit until I enter the fields.What I was hoping was that the checkbox could toggle the rules on or off.
var validator = $(".cmxform").validate({
rules: {
txtAddress1: {
[code]....
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Feb 24, 2011
sample code, whereby if I change a field value in a web form (from a drop-down list for example), the value shown in another field is automatically updated to show the needed value for that selected option?
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Oct 1, 2006
How do I change the background colour of an input box in a form as soon
as the value is changed? Also the background should revert back to it's
original colour if the user decides that they do not want to make any
changes and hence retype back the orginial value.
I do not want the background to change after the user has moved to the
next form field but as soon as the value has been changed.
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Jul 18, 2009
I have an .asp page for my customers which does just accepts e-mail information and passes this information to another .asp page. But before passing the info, a javascript checks whether the entered e-mail does match some certain rules. Rule1: If any input has been made at all, Rule2: If an "@" sign is there, if the"." is there and so on. upon pressing the submit button, the first rule works but the second rule does not. Could not figure it out why.
[Code]...
It is the function control() which validates the e-mail field. But it just validates whether the e-mail has been entered or not. The second check (with the @ sign) is not being made.
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Jul 23, 2005
Problem I began with: Netscape/Opera supports hover for different elements,
IE only supports hover for <a> and I want to use hover for <td class="menu">
I then found a fix using some Javascript here:
http://webpages.charter.net/mmmbeer...rbitrary-hover/
It works ok for IE now.
Problem I now have: I don't want the script to run in a browser that does
support hover for <td>.
In other words I noticed that the script was still running for Netscape and
Opera - but I would prefer to let those browser's native hover support to
work since I notice that in some cases the script can introduce lag at
loading time.
I don't want to sniff for IE: I know how unreliable browser sniffing is. I
would rather sniff for the lack of hover support.
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Oct 30, 2009
I have a drag and drop box. Don't know how to solve one problem. How to check if a drag and drop box have child elements?
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Mar 10, 2010
I was wondering if anyone has figured out a near-perfect way to check if the client has all the elements fully loaded? Not talking about all the css and text loading and the event triggers while the client is viewing images load: I mean the event auto-triggers after all the images are fully loaded, along with the css, text content, etc.
(P.S. Not talking about AJAX. Literally when somebody visits a page itself, the elements all completely load first, then the event fires.)
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Mar 31, 2011
Let me start by saying javascript is a weak point for me. I have a form with hierarchical data (in this case users, who have galleries, which have albums, which have images) now the form will be out put from a database query and look something like this:
[Code]...
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Oct 15, 2005
I've been playing with this form validation method for a while and have
tried an array of things but haven't had any luck with a couple items.
1. The validateForm() function doesn't detect when the Min price is
greater than the maximum price.
2. The validateForm() function doesn't call isNumber() on the minBaths,
maxBaths, minBeds, or maxBeds.
3. Despite errors in input and the validateForm() function returning
false, the form is still submitted.
Here's the code:
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Jul 16, 2011
I want to create a simple form with 5 fields name, email-id,password,retype password and telephone number the conditions are name & password must be valid,password and retype password should match and phone no must be of 10 digits. i have written functions for all this in javascript.tell me how to integrate to create a simple form with above fields.
How to integrate the functions and give me so that when i click submit button it should accept.
Below is the function,when i click submit button if any errors found it should display or else it should accept.
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Apr 26, 2010
I currently have a form named "survey". I found here a JavaScript to validate my form.
I am having serious issues with this script, either it won't execute at all (the form doesn't work, as well as the validation) or the form submits without validating the form.
Here is the current JavaScript I am using.
In the head section
Code:
Code:
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Mar 29, 2010
Im building a simple form that should check for two fields (not empty), however it seems the form is not being activated as no errors are being produced.
Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Guestbook</title> <script type="text/javascript"> function checkform() { if
[Code].....
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Sep 9, 2005
I have a problem with a Javascript dropdown form that is supposed to redirect users to the site that is selected. It works fine in IE, but it supposedly doesn't work in Firefox.
If anyone here can point out what is wrong with this code, I would appreciate it. Also, if there is any way to compact the code down or make it cleaner, that would also be appreciated.
<script type="text/javascript">
<!--
function goto(form) { var index=form.select.selectedIndex
if (form.select.options[index].value != "0") {
location=form.select.options[index].value;}}
//-->
</script>
<form name="nav_form">
<select name="select" size="1">
<option value="">Select a Site
<option value="http://www.sitepoint.com/" />Sitepoint
</select>
</form>
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Jul 29, 2007
I'm quite novice at javaScript but I have a good background in other similar languages, so I find I pick up things quick. Basically I'm planning on reading through some more solid resources on this topic, but I'm kinda under the pump at the moment for something that I imagine wouldn't be too difficult with a lil nudge in the right direction.
I have a form (using PHP) to update a mySQL database AND XML for flash, for a simple news page. At the moment I have the BBcode style of tags ([b][eb]). I was wondering how I can make a rich editor myself with just three buttons (one for italic, one for bold, one for links) that displays the text on screen to the user as WYSIWYG, and outputs the [b] [eb] tags for my PHP code.
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Nov 22, 2010
I keep getting a NaN on this form-based calculator I am trying to make... I can't figure out what I am doing wrong. Any input, or in this case "output", Here is the code:
Code:
<script type="text/javascript">
function calculateBudget()
{
[Code]....
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