checkbox validation in javascript

check box validation for form

<script language=”javascript”>

function validationCheckBox(){

var checkBoxVal = ‘false’;

var checkBox = document.forms[‘formName’].elements[‘checkBoxName’];

for(var i =0 ; i < checkBox.length ; i++){


checkBoxVal = ‘true’;




if(checkBoxVal == ‘false’){

alert(“Please select at least one check box…..”);

return false;


return true;




<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “”&gt;
<html xmlns=””&gt;
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
<title>Validation of checkbox demo</title>

<form name=”formName” id=”formName” onsubmit=”return validationCheckBox()”>
<input type=”checkbox” name=”checkBoxName” value=”check1″ />Check1
<input type=”checkbox” name=”checkBoxName” value=”check2″ />Check2
<input type=”checkbox” name=”checkBoxName” value=”check3″ />Check3
<input type=”checkbox” name=”checkBoxName” value=”check4″ />Check4


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