Objective:
To enforce keyboard entry so that users can only input numerical values for a text field
Code:
There are several online resources that describe this (e.g. http://stackoverflow.com/questions/995183/how-to-allow-only-numeric-0-9-in-html-inputbox-using-jquery, http://snipt.net/GerryEng/jquery-making-textfield-only-accept-numeric-values, etc.).
For example, if your text field ID is "numeric", you can use this sample script:
<script>
$(document).ready(function() {
$("#numeric").keydown(function(event) {
// Allow only backspace and delete
if ( event.keyCode == 46 || event.keyCode == 8 ) {
// let it happen, don't do anything
}
else {
// Ensure that it is a number and stop the keypress
if (event.keyCode < 48 || event.keyCode > 57 ) {
event.preventDefault();
}
}
});
});
</script>