Q909 Is it possible to access the default values of form elements and stop the submission of a form if none of its elements have been changed?

<script language="JavaScript"><!--
function testDefaultValues(what) {
    var result = true;
    var output = '';
    for (var i=0, j=what.elements.length; i<j; i++) {
        myName = what.elements[i].name;
        if (myName.indexOf('checkbox') > -1 || myName.indexOf('radio') > -1) {
            if (what.elements[i].checked && what.elements[i].defaultChecked) {
                output += what.elements[i].name + ' is still checked' + '\n';
                result = false
            }
        }
        if (myName.indexOf('hidden') > -1 || myName.indexOf('password') > -1 || myName.indexOf('text') > -1) {
            if (what.elements[i].value == what.elements[i].defaultValue) {
                output += what.elements[i].name + ' still equals "' + what.elements[i].defaultValue + '"' + '\n';
                result = false
            }
        }
        if (myName.indexOf('select') > -1) {
            for (var k=0, l=what.elements[i].options.length; k<l; k++) {
                if (what.elements[i].options[k].selected && what.elements[i].options[k].defaultSelected) {
                    output += what.elements[i].name + ' option ' + k + ' is still selected' + '\n';
                    result = false
                }
            }
        }
    }
    
    if (output != '')
        alert(output);
    return result;
}
//--></script>

<script language="JavaScript1.1"><!--
function testDefaultValues(what) {
    var result = true;
    var output = '';
    for (var i=0, j=what.elements.length; i<j; i++) {
        myType = what.elements[i].type;
        if (myType == 'checkbox' || myType == 'radio') {
            if (what.elements[i].checked && what.elements[i].defaultChecked) {
                output += what.elements[i].name + ' is still checked' + '\n';
                result = false
            }
        }
        if (myType == 'hidden' || myType == 'password' || myType == 'text' || myType == 'textarea') {
            if (what.elements[i].value == what.elements[i].defaultValue) {
                output += what.elements[i].name + ' still equals "' + what.elements[i].defaultValue + '"' + '\n';
                result = false
            }
        }
        if (myType == 'select-one' || myType == 'select-multiple') {
            for (var k=0, l=what.elements[i].options.length; k<l; k++) {
                if (what.elements[i].options[k].selected && what.elements[i].options[k].defaultSelected) {
                    output += what.elements[i].name + ' option ' + k + ' is still selected' + '\n';
                    result = false
                }
            }
        }
    }
    
    if (output != '')
        alert(output);
    return result;
}
//--></script>

<form name="myForm" onSubmit="return testDefaultValues(document.myForm)">
<br><input name="checkbox1" type="checkbox"><input name="checkbox2" type="checkbox" checked>
<br><input name="hidden" type="hidden" value="hidden value">
<br><input name="password" type="password" value="password value">
<br><input name="radio" type="radio" checked><input name="radio" type="radio">
<br><input name="text" type="text" value="text value">
<br><textarea name="textarea">textarea value</textarea>
<br><select name="select1">
<option>0
<option>1
<option selected>2
<option>3
</select>
<br><select name="select2" multipe size="2">
<option>0
<option>1
<option selected>2
<option>3
</select>
<p><input type="submit" value="Test Default Values">
</form>