JavaScript - Check All Checkboxes

My form generates 1 to n records which contains check boxes. Based on some condition if I click a check box it has to check & disable some other check boxes automatically. I did it. But, at the same time if I un-check I have to un-check all the check boxes which were checked. Please let me know. Thanks a lot.

All,
I have the following code which validates a form has at least one checkbox checked before it submits it. However I want to make sure that there aren't more then 25 checked on the page. How can I do this?
Code:

function validate(field)
{
for (var i = 0; i < field.length; i++){
    if(field[i].checked){ // if a field is checked form is submitted
        return true;
        }
    }
alert("You need to have a check box selected to submit the form!");
return false; // if no fields are checked form not submitted
}

Thanks in advance!

Good evening all,

I have a bit of an issue with checkboxes - basically I need to allow only 1 selection and then have a comments box show when a checkbox is checked. I've gotten the comments box to show when the checkbox is checked but I can't seem to workout how to allow only one. I'd really like the user to be able to change their mind and make a different selection but only have 1 be selected at a time (sort of like radio buttons work). I know it would be much easier and probably better to use radio buttons but that isn't an option with this. (The actual HTML is produced using a style sheet in an application that I am interfacing with so all I can do is use the checkbox.)

Here is the code I am using to show or hide the comments box.

Code:

  

function HideComments() 
{
  var a1 = document.getElementById("crmForm_answer1").checked; 
  var a8 = document.getElementById("crmForm_answer8").checked;
  var a2 = document.getElementById("crmForm_answer2").checked; 
  var a3 = document.getElementById("crmForm_answer3").checked; 
  var a4 = document.getElementById("crmForm_answer4").checked; 
  var a5 = document.getElementById("crmForm_answer5").checked; 
  var a6 = document.getElementById("crmForm_answer6").checked; 
  var a7 = document.getElementById("crmForm_answer7").checked;
  var a9 = document.getElementById("crmForm_answer9").checked;
  var a10 = document.getElementById("crmForm_answer10").checked;
 
  if(a1==true)
  {
    document.getElementById("crmForm_answer1_value").parentNode.parentNode.style.display = 'block';
   }
  else
    document.getElementById("crmForm_answer1_value").parentNode.parentNode.style.display = 'none';

  if(a8==true)
  {
    document.getElementById("crmForm_answer8_value").parentNode.parentNode.style.display = 'block';
  }
  else
    document.getElementById("crmForm_answer8_value").parentNode.parentNode.style.display = 'none';

  if(a2==true)
  {
    document.getElementById("crmForm_answer2_value").parentNode.parentNode.style.display = 'block';
  }

  else
    document.getElementById("crmForm_answer2_value").parentNode.parentNode.style.display = 'none';

  if(a3==true)
  {
    document.getElementById("crmForm_answer3_value").parentNode.parentNode.style.display = 'block';
  }

  else
    document.getElementById("crmForm_answer3_value").parentNode.parentNode.style.display = 'none';

  if(a4==true)
  {
    document.getElementById("crmForm_answer4_value").parentNode.parentNode.style.display = 'block';
  }

  else
    document.getElementById("crmForm_answer4_value").parentNode.parentNode.style.display = 'none';

  if(a5==true)
  {
    document.getElementById("crmForm_answer5_value").parentNode.parentNode.style.display = 'block';
  }

  else
    document.getElementById("crmForm_answer5_value").parentNode.parentNode.style.display = 'none';

  if(a6==true)
  {
    document.getElementById("crmForm_answer6_value").parentNode.parentNode.style.display = 'block';
  }

  else
    document.getElementById("crmForm_answer6_value").parentNode.parentNode.style.display = 'none';

  if(a7==true)
  {
    document.getElementById("crmForm_answer7_value").parentNode.parentNode.style.display = 'block';
  }

  else
    document.getElementById("crmForm_answer7_value").parentNode.parentNode.style.display = 'none';

if(a9==true)
  {
    document.getElementById("crmForm_answer9_value").parentNode.parentNode.style.display = 'block';
  }

  else
    document.getElementById("crmForm_answer9_value").parentNode.parentNode.style.display = 'none';

if(a10==true)
  {
    document.getElementById("crmForm_answer10_value").parentNode.parentNode.style.display = 'block';
  }

  else
    document.getElementById("crmForm_answer10_value").parentNode.parentNode.style.display = 'none';
}

Thanks in Advance
Sam

have a simple calculator i made with checkboxes and some Js.

the problem is that it does not work in FF.

any idea how this can work for
IE
Safari
AND FF


Code:

function getPrice(amount, boxName){
		total = eval() ;
	
		checked = document.getElementById(boxName).checked
			if (checked){
				total =  parseFloat(form1.Total2.value) + parseFloat(amount);

			}else{
				total =  parseFloat(form1.Total2.value) - parseFloat(amount);

			}
			total.toFixed(2);
		form1.Total2.value = total
		document.getElementById("total").innerHTML = "Total $"+total;
	}

Hi all.
I have the following problem that I require a pointer with.

I have a php variable named "$seatid"
This could contain 1 or many entries.

I have a page full of checkboxes named A1-8, B1-8, C1-8 etc to P1-8

I want a way of greying out the checkboxes on the page that relate to the values that are contained in the php variable. So they cannot be clicked.

It would also like to change the colour of the cell that the check box is contained in.

It is important that the checkboxes or at least the table that contain the checkboxes remain, as it represents the layout of a theatre.


Cheers for your help

This script works via "elem.checked" which is great for checkboxes (see http://javascript.internet.com/forms...heckboxes.html), but I need it to work with image buttons instead where there is no "checking" going on. Is this possible?

I tried elem.onclick and elem.clicked but neither works. I don't know enough about onclick conditionals. Please help.

Code:

function UpdateCost() {
  var sum = 0;
  var gn, elem;
  for (i=0; i<4; i++) {
    gn = 'game'+i;
    elem = document.getElementById(gn);
    if (elem.checked == true) { sum += Number(elem.value); }
  }
  document.getElementById('totalcost').value = sum.toFixed(2);
}

tl;dr: Want to make the above work with <a onclick="UpdateCost()"><img></a>, not <input type="checkbox" onclick="UpdateCost()">

Hi Guys,

I'm currently working on a page working with separate categories and a whole lotta check boxes. My objective is to have one checkbox deselect the other checkboxes in its category without interfering with the rest. How would I go about doing this assuming the id tag is already in use and differs per tag? I was thinking about cycling through all checkbox tags and sorting them out via class but I'm looking for something possibly more efficient.

Hi, I have a few checkboxes in a form. Some of them work independently, but some make the others go on and off. Specifically the lower ones are controlling the upper ones. Can anyone explain why please?

Code:

<td>	
		<input type="checkbox" name="weddingitem1"  value="Toppers" id="Toppers"/><label for="Toppers" >Toppers<br />
		<input type="checkbox" name="weddingitem2"  value="Champers" id="Champers"/><label for="Champers" >Champers<br />
		</td>

Hello. How can you modify this code so that if you click a checkbox that is ALREADY CHECKED, it will remain checked?

By the way, I have searched the web on how to do this and the general consensus seems to be "use radio buttons instead", but I would not like to use radio buttons. I would like to use checkboxes, I think they look better for what I am trying to do. Thanks for any help

Code:

<input type="checkbox" id="ckbox1" onclick="if(this.checked){ document.myform.ckbox1.checked=true; document.myform.ckbox2.checked=false; document.myform.ckbox3.checked=false;}" checked="checked" />Best Match
<input type="checkbox" id="ckbox2" onclick="if(this.checked){ document.myform.ckbox1.checked=false; document.myform.ckbox2.checked=true; document.myform.ckbox3.checked=false;}" />All Words
<input type="checkbox" id="ckbox3" onclick="if(this.checked){ document.myform.ckbox1.checked=false; document.myform.ckbox2.checked=false; document.myform.ckbox3.checked=true;}" />Exact Phrase

irst post here, i'll try to be simple: I need to create a form where participants of a medical convention register to classes, each class lasts 3 hours, so a person who wants to attend to class starting at 10 am cannot register to 11 am, 12pm and 1pm classes, but he can register to 2pm and so on.

There are 3 different classes per hour.

i thought doing this using javascript, but i'm absolutely lost.

Can you please give me a hint on how to do this?

Thanks!!

this is the part of the form that has the checkboxes.

<form method="post" action="process.php"></form>
<input type="checkbox" value="101" name="convention1"> 10 am: Cariovascular desease<br>
<input type="checkbox" value="102" name="convention2"> 10 am: Changes on toracic surgeon<br>
<input type="checkbox" value="103" name="convention3"> 10 am: New drugs on heart<br>
<input type="checkbox" value="111" name="convention4"> 11 am: New drugs on heart (II)<br>
<input type="checkbox" value="112" name="convention5"> 11 am: Dynamic process on blood pressure<br>
<input type="checkbox" value="113" name="convention6"> 11 am: Aortic disease<br>
<input type="checkbox" value="121" name="convention7"> 12 am: Pulmonar Pressure<br>
<input type="checkbox" value="122" name="convention8"> 12 am: Open table<br>
<input type="checkbox" value="131" name="convention9"> 1 pm: Neurological aspects on heart rate<br>
<input type="checkbox" value="132" name="convention10"> 1 pm: Cardiovascular disease (II)<br>
<input type="checkbox" value="133" name="convention11"> 1 pm: Mioresponse on heart failure<br>
<input type="checkbox" value="141" name="convention12"> 2 pm<br>
<input type="checkbox" value="142" name="convention13"> 2 pm<br>
<input type="checkbox" value="143" name="convention14"> 2 pm<br>
<input type="checkbox" value="151" name="convention15"> 3 pm<br>
<input type="checkbox" value="152" name="convention16"> 3 pm<br>
<input type="checkbox" value="153" name="convention17"> 3 pm<br>
<input type="submit"></input>
</form>

i'm using
http://www.javascript-coder.com/html...lidation.phtml

now I want to know how to validate a checkbox

if i have

<input type=checkbox id="c2" name=33>dd&nbsp;<input type=checkbox id="c2" name=33>ff.aa&nbsp;<input type=checkbox id="c2" name=33>ddd&nbsp;

is it correct to have them all with the same id and how do I validate it using this validation routine?
(or if this one doesn't work is there a specific validation functions -your can recommend that are easy to use for all different types of input)

I have a group of checkboxes named "list[]". I want to validate that at least one is checked. How can I do this?

Hello,

I have a form generated by mySQL and PHP, and inside the form (named 'UpdateDB') each line has checkboxes, like so:

Code:

<input type="checkbox" name="checkbox[]" value="96" onclick="highlight(this,'check_96')">

The onclick is to highlight the row, that works fine. However, I wrote a javascript function that toggles the select all the checkboxes or none. This is done by an image:

Code:

<img src="img/select.png" align="top">
<a href="#" onClick="togBox('updateDB');"><img src="img/all.png" name="listToggle" align="top"></a>

Easy, right? So heres the Javascript function that the above image (the 'none' part) links to:

Code:

function togBox(form) 
	{	var myForm = document.forms[form];
		document.listToggle.src=='http://gospeltruth.tv/admin/img/all.png' ? toggle = true : toggle = false;
		(toggle) ? document.listToggle.src='img/none.png' : document.listToggle.src='img/all.png';
		for( var i=0; i < myForm.length; i++ ) 
		{ 
			(toggle) ? myForm.elements[i].checked = 'checked' : myForm.elements[i].checked = '';
		}
	}

Its a brilliant function if I do say so myself, and this is what I dont get: two days ago, it was working fine, today, its not working at all. The image changes, but IE flags up the 'myForm.length' as an error.

How was it working 2 days ago and not today, when I havent touched it? Can anybody advise why its not currently working?

Thanks for your help,

~Chud37

Hi all,

I have a form with a number of checkboxes. The 1st one is "Select All".
When this checkbox is ticked I would like to disable all others. When the "Select All" checkbox is unticked, all checkboxes should be enabled.

Can anyone tell me how to do this? is JQuery the preferred method these days?

Thanks in advance

Hi,

I'm using the following code to toggle checkbox checked and disabled attributes.

Code:

var f = false;
function tick(group) {
if (!f) {
   for (var i=0, len = group.length; i < len; i++) {
      group[i].disabled = true;
	  group[i].checked = true;
	  }
   }
else {
   for (var i=0, len = group.length; i < len; i++) {
      group[i].disabled = false;
	  group[i].checked = false;
	  }
   }
f == true? f=false:f=true;
}

The checkbox doing the js call uses onclick="tick(country)"

and the checkboxes that I want to toggle all have the same id e.g.

Code:

<label><input type='checkbox' name='uk[]' id='country' value='England' />England</label><br />
<label><input type='checkbox' name='uk[]' id='country' value='Scotland' />Scotland</label><br />

This all works correctly but does not validate.
I need to use unique id's for each name.
The easiest way (as each checkbox html is generated by php) is to append the value to the id i.e.

Code:

<label><input type='checkbox' name='uk[]' id='countryEngland' value='England' />England</label><br />
<label><input type='checkbox' name='uk[]' id='countryScotland' value='Scotland' />Scotland</label><br />

How can I modify the javascript function factor this in i.e. toggle where id contains country?