JavaScript Validate Multiple check box

How to validate Multiple check box in JavaScript

Usage :This validation can use to least one or more of the checkboxes is required to be checked

Compatibility :

JavaScript Code :

Insert this JavaScript in the head section of the html code.

<script language="javascript1.1">

function validate_form(the_form){

var counter=0;

for (i=0; i< document.form1.checkbox_item.length; i++) {

if ((document.form1.checkbox_item[i].checked)) {

counter+=1;

}

}

if(counter==0){

alert("Please select one or more checkbox");

return false;

}

return true;

}

</script>

Html Code :

<form name="form1" id="form1" action="#" method="post" onsubmit="JavaScript:return validate_form(this);">

checkbox 1<input type="checkbox" name="checkbox_item[]" id="checkbox_item" value="checkbox 1">

checkbox 2<input type="checkbox" name="checkbox_item[]" id="checkbox_item" value="checkbox 2">

checkbox 3<input type="checkbox" name="checkbox_item[]" id="checkbox_item" value="checkbox 3">

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

</form>

Demo :

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