2016/4/29 問卷

<form action="#" method="post" class="demoForm" id="demoForm">
    <fieldset>
        <legend>Demo: Get Value of Selected</legend>
 
    <p>Select a shipping method:</p>
    <p>
        <label><input type="radio" name="ship" value="a" checked /> a:Standard Ground</label>
        <label><input type="radio" name="ship" value="b" /> b:Second Day</label>
        <label><input type="radio" name="ship" value="c" /> c:Overnight</label>
        <label><input type="radio" name="ship" value="d" /> d:Pick up</label>
    </p>
 
    <p><button type="button" name="getVal">Get Value of Selected</button></p>
 
    </fieldset>
</form>
<script type="text/javascript">
// to remove from global namespace
(function() {
 
    function getRadioVal(form, name) {
        var val;
        var radios = form.elements[name];
     
        for (var i=0, len=radios.length; i<len; i++) {
            if ( radios[i].checked ) {
                val = radios[i].value;
                break;
            }
        }
        return val;
    }


    document.forms['demoForm'].elements['getVal'].onclick = function() {
        alert( 'The selected radio button\'s value is: ' + getRadioVal(this.form, 'ship') );
    };
 
 
    // disable submission of all forms on this page
    for (var i=0, len=document.forms.length; i<len; i++) {
        document.forms[i].onsubmit = function() { return false; };
    }
 
}());

</script>