Radio button validation

[rowantrimmer123]

Hello,

I have 2 radio buttons and I need to write a script that checks that 1 of the 2 radio buttons has been checked as they cannot both be unchecked.

My html for the form is as follows...

<tr>
<td colspan="2" class="formname"><b><span style="COLOR: red"></span>Are you a Parent?</b>&nbsp;&nbsp;&nbsp;<input name="person" type="radio" value="1" /></td>
</tr>
<tr>
<td colspan="2" class="formname"><b><span style="COLOR: red"></span>Are you a Teacher?</b>&nbsp;<input name="person" type="radio" value="2" /></td>
</tr>

I would really appreciate the code for the javascript.

Kind Regards

Rowan

[djjjozsi]

if you create a valid radio botton the visitor could only select one from teh above.

1<input type="radio" id="test" name="test" value="1"><br />
2<input type="radio" id="test" name="test" value="2"><br />

[Weedpacket]

1<input type="radio" id="test" name="test" value="1"><br />
2<input type="radio" id="test" name="test" value="2"><br />

Uh, that's not valid; you've got two elements with the same id 🙂
The issue that needs addressing is that there's nothing there to require selecting one of the options.

rowantrimmer wrote:

I would really appreciate the code for the javascript.

So why post in a PHP forum? Moving the thread.

[djjjozsi]

Thanks Weedpacket that you warned me about my mistake.

[bradgrafelman]

Here's the way I normally do it:

<script type="text/javascript">
function validateRadio(frm) {

for (i = 0; i < frm.test.length; i++)
	if(frm.test[i].checked)
		return true;

alert('Error: You must select an option!');
return false;

}
</script>
<form onsubmit="return validateRadio(this)">
1<input type="radio" name="test" value="1"><br />
2<input type="radio" name="test" value="2"><br />
<input type="submit">
</form>

or you could make the function more generalized to suit multiple radio groups:

<script type="text/javascript">
function validateRadio(frm, name) {

for (i = 0; i < frm[name].length; i++)
	if(frm[name][i].checked)
		return true;

alert('Error: You must select an option!');
return false;

}
</script>
<form onsubmit="return validateRadio(this, 'test')">
1<input type="radio" name="test" value="1"><br />
2<input type="radio" name="test" value="2"><br />
<input type="submit">
</form>