<html>
<body>
<p id="p1">Select a value from the list below, to change this element's opacity!</p>
<select onchange="myFunction(this);" size="5">
<option>0
<option>0.2
<option>0.5
<option>0.8
<option selected="selected">1
</select>
<script>
function myFunction(x) {
// Return the text of the selected option
var opacity = x.options[x.selectedIndex].text;
var el = document.getElementById("p1");
if (el.style.opacity !== undefined) {
el.style.opacity = opacity;
} else {
alert("Your browser doesn't support this example!");
}
}
</script>
</body>
</html>
OutPut
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