Javascript GetElementByID() To Form Value
Dec 17, 2007
I am trying to implement a color picker for my users to choose their own custom background colors. I have an ajax color picker that works great but I am having issues passing the picked HEX value to my form. I am also using PHP.
Here is my javascript.
HTML Code:
<div id="plugHEX" onmousedown="stop=0; setTimeout('stop=1',100);">FFFFFF</div>
This displays the correct value on screen.
However I need to pass that value through a form so that I can update my DB for the user who picked.
My form field should look something like this:
<input type="hidden" name="color" id="plugHEX" value="VALUE FROM PICKER">
I tried putting javascript: getElementbyID(plugHEX); in that spot but it didn't work. Any ideas on how i can grab that value for the hidden field by using HTML, PHP or javascript?
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May 27, 2010
I have a form element that accepts a name. If the user leaves the name field, it should give an error in the div under the element:
[code]....
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Jul 20, 2005
Assume a form with a button
<form id="myform"
<input id="mybutton" type="button">
</form>
how can i use getElementById to access the button?
I tried this: var a
a=document.getElementById("mybutton")
but i get an error "a is not an object"
Any idea?
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Sep 16, 2010
I'm trying to get the value of a selected option value. I've tried using getElementById("fieldname").selectedIndex.value and formname.elements["fieldname"].options[selectedIndex].value with no joy.
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Oct 20, 2011
I wanted to know if document.getElementById works while accessing form elements. I tried doing this just for testing purposes
This code doesnt work
function validateForm()
{
var val = document.getElementById("id_login").getAttribute("value");
alert(val);
return false;
[Code]...
Why doesnt document.getElementByid work with form objects.it works with all non form HTML objects..
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Apr 14, 2009
I have a draggable marker on my page that sets the value of a javascript variable when the marker is released.I want to submit this value to store it in a database however I cannot figure out how to pass this javascript variable as a hidden form field.Here is my code. I suspect this is completelyhow to make this "lat" value available to me after the form has been submitted.
Code:
<form name="myform" method="post" action="" >
<input type="hidden" name="lat" id="lat"
[code].....
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May 13, 2004
I want to restrict getElementById to search children of a specific element instead of searching the entire document, in the same way that I can do getElementsByTagName using a specific element as the parent.
In this particular instance the parent is a table and the elements I'm interested in are all TDs, so I did the basic getElementsByTagName('TD') off the table and looped through this array checking the IDs. However, I'm suspecting that the browser can do getElementById faster than I can do a loop in javascript. Is there a neater way to do this? For now, I'll settle for IE-only solutions, though it would be nice to have things work in generic browsers.
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May 31, 2011
I keep getting an error stating "getElementById("ballElement") is null, but I have a div with that exact id. I have looked at the JS script before that line, but found no errors there either. Please take a minute to see if you find something.
[Code]...
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Jun 25, 2009
I have a issue with a javascript code that I wrote. This script is a simply for calculating the summation of 2 text input boxes and printing it in another text input box within the form. The entire form is then sent using Form post.The total is written back to the form's total text input box using the code below:
document.getElementById ('total').value = total
This code works perfectly for displaying the values on screen. However, when I send the form (PHP Post), the " total " field is empty. I have searched all over for possible solutions. But no solution yet.
1. document.getElementById ('total').INNERHTML = total .This does not even work on screen and total field is not updated on screen. Needless to say, the PHP Post variable was also empty.
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Jul 23, 2005
I have a web form with several fields. If I copy & paste from a RTF document into a field, the javascript validation and field length are bypassed and cause the form to fail.
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Oct 19, 2006
I am trying to make a form for my friends to fill in which will calculate their average score. Currently my script body is something like this Code:
<HTML>
<HEAD>
<TITLE>Lab 1</TITLE>
</HEAD>
<BODY bgcolor="C0C0C0">
<SCRIPT language="JavaScript">
<!--
alert("Please enter your scores. Thank You.")
var english = ??
var maths = ??
var geography = ??
var chinese = ??
var lit = ??
var psci = ??
var lsci = ??
var art = ??
var hist = ??
var mep = ??
var total = english + maths + geography + chinese + lit + psci + lsci + art + hist + mep
var subjects = 10
document.write("Your average is " + total / + subjects)
//-->
</SCRIPT>
</BODY>
</HTML>
So what I was thinking was is it possible to make a form that will fill in the variables after they have typed it in and click ok, the variables will the be added and calculated to give the average.
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Sep 25, 2001
I have a form with two fields, Item_Price and Item_Name
Item_Price looks like this:
<select name="Item_Price">
<option value="19.95">24" x 36" - Photo Glossy Paper</option>
<option value="24.95">24" x 36" - Satin Finish Paper</option>
</select>
Item_Name needs some javascript to do this:
<input type=hidden name="Item_Name" value="get the value of Item_Price option (not option value)">
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Mar 1, 2006
this is javascript code for resetting the form. this is working on IE but not firefox. what is the problem?
<P align=left> <a href="#" onclick="document.getElementById('form1').reset()">
<img src="images/reset.gif" width="86" height="26" class="bob24"></a>
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Oct 17, 2001
I am trying to make a trivia game for a project that i'm doing, and i'm having some troubles. I have 5 questions stored in arrays, the 5 answers stored in a different array and those 5 answers wrote out in another array. I have 5 text boxes, one displaying the questions and the other 4 displaying the multiple choices. I also have 4 submit buttons, one for a, b, c and d. Now i just need to make sure that the answer the user picks is the right one. I was thinking, if there was a way to tell which submit box is clicked, that i would do something along that line, but if any one has a better way to do it then cool. Here's my code:
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Jul 23, 2005
Is there anyway to create a javascript function to submit a form in the same html file?
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Oct 12, 2005
I wish to carry out standard form validation (i.e. is it a date?, is
there a value in the field, is it a number) using the onBlur event
rather than the onSubmit event. This (of course) leads to problems when
cancelling an edit as leaving a field to press the cancel button will
trigger the onBlur event and therefore the field validation. Is there
any way to know the destination field / button that caused the onBlur
event? In Ingres ABF/W4GL (mid eighties language of similar
functionality to javascript) there was an available attribute called
the targetfield so the code could run...
onBlur myfield =
{
if (targetfield != CancelButton) {
carry out validation
}
}
Is there something similar in javascript or will I have to program
round the houses i.e. onBlur records which validation to run and
onFocus runs the validation (unless it's a cancel button)?
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Jul 20, 2005
I have a page which contains a form.
I want a customized button with an image for the submit button, and when the
submit button has been clicked send the form to the perl script.
Now the form is no problem but the button is, so the question is how do I
create a custom button and how do I submit the form with javascript when the
button is clicked?
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Jul 20, 2005
I'm making a nice little login box in Javascript but having problems Posting
the value inside a textfield.
In a nutshell:
I have a function:
function getPostData (value)
Which correctly gets the value, but how do I then create a form and submits
inside Javascript?
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Jul 20, 2005
Is it possible to use JavaScript to apply different actions to a form
depending on a value within the form (eg sending form data to
different cgi scripts depending which radio button is checked)?
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Jan 24, 2008
I've got a PHP form, but I want to minimise DB requests and therefore only UPDATE the mysql server if the form has actually been changed.
Is there a way the client side can do a check like this or should I just do it on the server side?
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Oct 4, 2006
I have a form that I would like to display a javascript calculation into the value field.
The code i Have is
<form name="form1" method="post" action="nextpage.asp">
<input type="text" name="textfield" value=" document.write(document.applets[0].getLHost());">
</form>
Basically I want the document.write(document.applets[0].getLHost()); to display as the value in the form field. But when I try this it literally displays the code.
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Dec 9, 2005
I want the form to hide the bottom two fields and display one or the other depending on what the nature of the enquiry is. Is there some HTML/ Javascript code that does this and can anyone point me in the right direction.
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Jun 5, 2007
Why wont this work? checkFields() iF statment is failing. The select must be set to multiple.
<form method="POST" action="" name="this_form" onSubmit="return checkFields();">
<select name="this_select[]" multiple>
<option value="ts1">ts1</option>
<option value="ts2">ts2</option>
<option value="ts3">ts3</option>
<option value="ts4">ts4</option>
</select>
</form>
<script language="Javascript">
<!--
function checkFields(){
var errormsg = "";
if (document.this_form.this_select.value == "") { var errormsg = errormsg + "Please Select an Value.
"; }
if (errormsg != "") { alert(errormsg); return false; }
}
//-->
</script>
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Mar 9, 2002
I am making a registration form that users enter information on one page that I want to be able to take the entry information and put it into another page.
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Jul 23, 2005
I've been using some code to verify form data quite happily, but i've
recently changed the way my form is structured, and I can't get it to work
now.
Originally :
The form is called "form1", and I have selects called "PORTA", "PORTB" ...
etc...
I then had javascript that accessed these selects as below, and it worked
fine.
ind = document.form1.PORTD.selectedIndex;
val = document.form1.PORTD.options[ind].value;
dev = document.form1.PORTD.options[ind].text;
My form is now autogenerated, and form data is stored to file, so I now use
an associative array for thte form elements (so that I can loop through them
easily), The form elements names are now :
McuCfg[PORTA], McuCfg{PORTB} and so on
Now, I modified the javascript so that it now uses the McuCfg[] associative
array :
ind = document.form1.McuCfg[PORTD].selectedIndex;
val = document.form1.McuCfg[PORTD].options[ind].value;
dev = document.form1.McuCfg[PORTD].options[ind].text;
When the script runs, I get the error
"document.form1.McuCfg.PORTD is null or not an object"
I have used the same notation that i know works for the "options" array
although that's not an associative array.
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Jan 9, 2006
Is there some way by which I get to know if the state of my form
elements have changed or not ? I mean If I have to save data which has
been entered by user in the screen, Is there some way in the JS level
that I am able to check (before i pass information to java) if the
value of the form element is same or different from the time the page
had loaded ?
So ill be able to selelct and save only those elements whose values
have been changed
I am dealing with text boxes and drop downs . .
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