DISABLING TEXTBOX ON CHANGE EVENTS IN JAVASCRIPT
<!DOCTYPE html>
<html>
<body>
<p>Select a new car from the list.</p>
<input type="text" id="myText">
<select id="mySelect" onchange="myFunction()">
<option value="Audi">Audi
<option value="BMW">BMW
<option value="Mercedes">Mercedes
<option value="Volvo">Volvo
</select>
<p>When you select a new car, a function is triggered which outputs the value of the selected car.</p>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("mySelect").value;
document.getElementById("demo").innerHTML = "You selected: " + x;
if(x=="Volvo")
{
document.getElementById("myText").disabled = true;
}
}
</script>
</body>
</html>
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