Restricting the user from filling the data in a textfield using html

I got a requirement like this,

If the user is trying to fill a text field, i have to restrict him

View Answers

May 19, 2011 at 1:28 PM

<html>
<script>
function getValue(){
var v=window.prompt("Enter your name: ");
document.getElementById("cal").value=v;
}
function valid(){
alert('Click the button');
document.getElementById("cal").value="";
}
</script>
<input type="text" id="cal" onkeydown="valid();"><input type="button" value="popup" onclick="getValue();">
</html>

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