There is a problem in category and sub category selection using php

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i have three drop-down lists connected with each other and as shown in example
drop down lists
these lists are working properly but i want to disable remaining lists until i select any item from parent list.

Posted 30-May-14 20:35pm

Vivek_Maruxxxx

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Peter Leow · Accepted Answer · 2014-05-30T22:13:00

Try jQuery:

XML

<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $('#cars').change(function(){
        $('#colors').prop('disabled', $(this).val() === '');
    }).change();
});
</script>
</head>
<body>

<form action="">

<select name="cars" id="cars">
<option value="">Select one...</option>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="fiat">Fiat</option>
<option value="audi">Audi</option>
</select>

<select name="colors" id="colors">
<option value="">Select one...</option>
<option value="white">White</option>
<option value="yellow">Yellow</option>
<option value="silver">Silver</option>
<option value="blue">Blue</option>
</select>
</form>

</body>
</html>