Onchange event will be fired when control value has been changed.
Code Sample:
<html>
<head>
<title>Onchange event example in JavaScript</title>
<script language="Javascript">
function selctcntry(evt, t) {
if (t.selectedIndex > 0)
document.getElementById("Text1").value = t.value;
else
document.getElementById("Text1").value = "";
}
</script>
</head>
<body>
<table align="center">
<tr>
<td>
<input type="text" id="Text1" />
</td>
</tr>
<tr>
<td>
Select the country name from the dropdown
</td>
</tr>
<tr>
<td>
<select onchange="selctcntry(event,this);">
<option value="India">Select</option>
<option value="India">India</option>
<option value="USA">USA</option>
<option value="China">China</option>
<option value="Japan">Japan</option>
<option value="Canada">Canada</option>
</select>
</td>
</tr>
</table>
</body>
</html>
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