how do I validate dropdown list and radiobutton in javascript to be a mandatory selection by user and throw an alert if user doesn't select

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I have a dropdown list and some radio buttons to be selected on a form by the user.
The form on submission must throw an alert saying,"please select a value from dropdown/radiobutton".
Can anyone please tell me how I can achieve this using javascript validation?
I tried using required attribute for dropdown but I am not aware how I can make it show an alert if not selected..

Posted 5-Mar-13 19:15pm

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gavkk · Answer 1 · 2013-03-19T01:45:00

try to get from this simle code :

XML

<html>
    <head>
        <title>Untitled</title>
        <script type="text/javascript">
            function checkit(){
                if(!document.getElementById("cid").checked){
                    alert("Check the checkbox")
                }
                else{
                    a.submit();
                }
            }
        </script>
    </head>
    <body><form id="form1">
        <input type="checkbox" id="cid"/>
        <input type="button" value="Submit" onclick="javascript:checkit();"/>
        </form>
    </body>
</html>