Possible Duplicate:
How to allow only numeric (0-9) in HTML inputbox using jQuery?
how can I limit user input as user type in a text box?
For example, I want to accept only a number and I want to ignore user input as long as it's putting non-numeric character. So,
Thanks!!! Robert
You can validate a form in javascript using the form's onsubmit event:
<form enctype="application/x-www-form-urlencoded" method="post" onsubmit="validate(this);">
<input type="text" name="number" />
<input type="submit" name="submit" value="send" />
</form>
Then all that remains is validation:
function validate(form) {
if(isNaN(form.number.value)) {
alert('not a number!');
return false;
}
}
Problem is, javascript is run client-side. That means people can bypass this easily so you have to check server-side either way.
If you are sure your audience have modern browsers you can also use the HTML5 element <input type="number" />. But then again, this is client-side and you would have to check server-side.
Using onKeyPress() event on the textbox fetch the user input and handle it accordingly however you want.
To handle copy + paste scenario, you can handle via onChange() event handling.
