allow only numerical values to be entered in a textbox

[namax]

I have created a php form and addaded a text box(name="preidno") to enter id numbers and would like to let data entered to be only numbers.

Could anyone help me with this problem please since I am new to php programming?

Thankyou in advance.

 

[DonQuichote]

It is not possible to block all non-numeric input from the client, but you can use javascript to do validation before anything is submitted, if the client allows and supports it. You'd better ask in a javascript forum.

+++ Despite being wrong in every important aspect, that is a very good analogy +++
Hex (in Darwin's Watch)

 

[feherke]

Hi

In addition to DonQuichote's reply, the JavaScript check is just a guidance for the users. Validation must be done with server-side coding :

[teal]<?php[/teal]
[b]if[/b] [teal](![/teal][COLOR=darkgoldenrod]is_numeric[/color][teal]([/teal][navy]$_GET[/navy][teal][[/teal][green][i]'preidno'[/i][/green][teal]])[/teal] [b]die[/b][teal]([/teal][green][i]'go back and write numbers only in the id field'[/i][/green][teal]);[/teal]

Note that you wrote "only numbers", so I used [tt]is_numeric()[/tt] to check for numbers. See its documentation for details on what kind of numbers it accepts and what alternatives exist.


Feherke.

http://free.rootshell.be/~feherke/

 

[jasc2k]

Agreed javascript is the only way as its a client side language.
The link below shows a nice snippet with usage using keyboard mapping:

http://www.go4expert.com/forums/showthread.php?t=2359

http://www.myphaze.co.uk

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