Need help to check several checkboxes

Hi,

I am newbie to all this and I really appreciate all the help out there

I have a form with 4 checkboxes.

I need atleast one of them to be checked before being able to post the form

How can I do this?

This is my simple form
---------------------------
<form name="form1" method="post" action="nextpage.htm" target="_blank">
<p>
<input name="checkbox2" type="checkbox" id="checkbox2" value="1">
Number 1</p>
<p>
<input name="checkbox2" type="checkbox" id="checkbox2" value="2">
Number 2</p>
<p>
<input name="checkbox3" type="checkbox" id="checkbox3" value="3">
Number 3</p>
<p>
<input name="checkbox4" type="checkbox" id="checkbox4" value="4">
Number 4</p>

<input name="Submit" type="submit" >

_--------------------------------------------

Thanks for your help
Fred

 

You shouldn't let javascript be your only form of validation. I could turn javascript off and I wouldn't have to check any of them then.

That being said, this should work for you:

<script>

function validate_check_boxes()
{
	var success;

	if(document.form1.checkbox1.checked)
		success = 1;
	else if(document.form1.checkbox2.checked)
		success = 1;
	else if(document.form1.checkbox3.checked)
		success = 1;
	else if(document.form1.checkbox4.checked)
		success = 1;
	else
		success = 0;

	if(success == 1)
		return true;

	else
	{
		document.getElementById('error').innerHTML = "Error! At least one checkbox must be checked!";
		return false;
	}

}


</script>

<span id='error'></span>
<form name="form1" method="post" action="nextpage.htm" onsubmit="return validate_check_boxes()">
<p>
<input name="checkbox1" type="checkbox" id="checkbox1">
Number 1 </p>
<p>
<input name="checkbox2" type="checkbox" id="checkbox2" >
Number 2 </p>
<p>
<input name="checkbox3" type="checkbox" id="checkbox3">
Number 3 </p>
<p>
<input name="checkbox4" type="checkbox" id="checkbox4">
Number 4 </p>

<input name="Submit" type="submit">
</form>

Code (markup):

-the mole

 

Many Thanks

In the nextpage.htm, I actually use php to make sure that one checkbox has been selected, with an error message if this is not the case. I just needed something on the initial page for ease of use for the person browsing

Fred