get value select javascript
<body>
<select id="list" style="padding: 10px;" onchange="getSelectValue();">
<option value="js">JavaScript</option>
<option value="php">PHP</option>
<option value="c#">Csharp</option>
<option value="java">Java</option>
<option value="node">Node.js</option>
</select>
<script>
function getSelectValue()
{
var selectedValue = document.getElementById("list").value;
alert(selectedValue);
}
getSelectValue();
</script>
</body>