Check for whole number in textbox

[Roy766]

How could I make it so that the browser checks for a whole number from a textbox? So that if the user types in 13.99 into a textbox, it echoes 'Please enter a whole number!', or something along those lines?

[pocobueno1388]

Use the is_int() function.

[.josh]

also if you're wanting a popup that's a clientside script's department, like javascript.

[serverman]

like this!

<?php
$n = 12.2;
if (is_int($n)){
//somescript

}else{
echo '<script>
alert("Please use a whole number");
</script>';}?>

[.josh]

like this!

<?php
$n = 12.2;
if (is_int($n)){
//somescript

}else{
echo '<script>
alert("Please use a whole number");
</script>';}?>

 

/fail