JavaScript Reference/Javascript Properties/defaultChecked

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"defaultChecked" Example

<!-- 
Example revised from 
The Web Programmer"s Desk Reference
by Lazaro Issi Cohen and Joseph Issi Cohen 
ISBN: 1593270119
Publisher: No Starch Press 2004
-->    
<html>
<body>
<script language="JavaScript">
function function1() {
    if (myRadioButton1.defaultChecked) {
        alert("Radio 1 is checked");
    }
    if (myRadioButton2.defaultChecked) {
        alert("Radio 2 is checked");
    }
    if (myCheckBox.defaultChecked) {
        alert("Checkbox is checked");
    } 
} 
</script>
<input id="myRadioButton1" type="radio" checked value="radiobutton">Radio 1<br>
<input id="myRadioButton2" type="radio" value="radiobutton">Radio 2<br>
<input id="myCheckBox" type="checkbox" value="checkbox" checked>Checkbox</p>
<input type="button" value="Click here" onclick="function1();">
</body>
</html>



"defaultChecked" is applied to

+----------------+--------------------------------------------------------------+
| Applied_To     |<input type="checkbox">         <input type="radio">          |
+----------------+--------------------------------------------------------------+



"defaultChecked" Syntax and Note

Note:
    
Syntax:
    
document.getElementById("inputID").defaultChecked = value
document.all.inputID.defaultChecked = value // IE only
Источник — «http://wbex.ru/index.php?title=JavaScript_Reference/Javascript_Properties/defaultChecked&oldid=6857»