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how to validate a number field in range of 1 to 3 or just 3 digits

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Oct 28.2006

hi, i m using this codes in my asp form to validate a field must be in range 1 to 3 or just 3 digits in data field, but its not working.

if(document.form.rollno.value > 3){
alert(‘you must fill only 3 digit roll number please!’);
document.form.rollno.focus();
return false;
}

please check it and tell me where i m wrong

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JavaScript

2 Comments(s) ↴

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@ythamwongJul 31.2007 — You should use regular express
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@ipingaJul 31.2007 — yeah i guess a regular would do the job.. you could do this:

[CODE]function validate() {
if (/^d{3}$/.test(document.form.rollno.value)) {
// do what you want to do
else {
alert('you must fill only 3 digit roll number please!');
document.form.rollno.focus();
}
}[/CODE]
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