[RESOLVED] Limit input

JonathanS

Hm... can anyone help med how I can limit a form input to not be more than a specific value? For instance you should not be allowed to type in a number more than 1826. Is this possible to do in some way? Please help!

Thank you for your support

dougal85

Well, you can check it clientside with JavaScript (this isn't secure) then you can check serverside in PHP (you will want to do this).

Doing it JavaScript will make it easier and avoid so many page refreshes.

You will want to make an input box (<input type="text" />) and then use the onkeypress (or onchange depending on what you want exactly) event to call a javascript validation method. This will then check the value of the input box.

With the onkeypress you can restrict the user to only entering in numbers for example. Then if they enter a number over 1826 you could warn them or change it to 1826, ie. the highest.

Many choices for you here 😉

rsmith

Well do you not want to allow a number larger than 1826 or largerer than 4 digits. If you want to limit digits it would be

<form action="checkForm.php" method="post">
     <input type="text" maxlength="4" name="number">
</form>

If you don't want someone to put in a number larger than a certain value, you would have to use a check on your form processing script like this:

<?
     //get the number
          $number = $POST['number'];

 //see if it's larger than 1826.
      if($number > 1826){
           echo "Error: Number entered is larger than 1826.";
           exit();
      }else{
           //finish script processing
      }
?>

Hope this helps.

JonathanS

Really great!!

rsmith

If our answers helped you, please mark the thread resolved! Thanks.