Radio.defaultChecked : Radio Button : Form JAVASCRIPT TUTORIALS

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Radio.defaultChecked

The defaultChecked property is a Boolean value that reports which radio buttons contain the HTML CHECKED attribute.

If the CHECKED attribute is contained in the Radio object, true is returned. Otherwise, false is returned.



<html>
    <head>
    <title> Example of the radio defaultChecked property</title>
    </head>
    <body>
    <script language="JavaScript">
    <!--
    function checkBox(){
        if(document.form1.button1.defaultChecked == true){
            alert("Box1 is checked by default");
        } else if(document.form1.button2.defaultChecked == true){
            alert("Box 2 is checked by default");
        }
    }
    -->
    </script>
    <form name="form1">
    <input type="radio" name=button1>Box 1
    <br>
    <input type="radio" name=button2 CHECKED>Box 2
    <br><br>
    <input type="button" value="Get Default" onClick='checkBox()'>
    </form>
    </body>
    </html>