<!DOCTYPE html>
<html>
<script>
function change_value(){
alert("checking point");
if (document.getElementById('11307').value != null) {
var eMulti = document.getElementById("11307");
for (var i=0; i< eMulti.options.length; i++) {
if (eMulti.options[i].selected ==true) {
document.getElementById('def').value = eMulti.options[i].value +'@@' ;
}}
} else {
document.getElementById('def').value = "abc is blank." ;
}
}
</script>
<body>
<input id="def" type='text' value="Intiated!" />
<select id="11307" name="cars" multiple>
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select>
<button onclick="change_value()">Try it</button>
<p>Hold down the Ctrl (windows) / Command (Mac) button to select multiple options.</p>
</body>
</html>
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