length checking

[verN]

hi, i wanted to know how to check that the user hasn't inputted a vlaue more then for instance 15 charactrs.

 

I have a form which takes the name, and other contact details. But I would like to preverent the user from entering 30 characters rather then less then 20 is there a way to do this.

Thanks

 

<input type=text name=name size=20 />

 

i was thinking one could use javascript where the input tag can take onchange or can php do this

 

 

[Dragen]

if it's unputting into a database and you have a limit on the database of 30 characters, then I think it should display an error.

[Orio]

<?php

if(strlen($var) > 15)
die("Too long!");

?>

 

Orio.

[jitesh]

<input type=text name=name size=20  onChange="javascript:return check(this.value);"/>

<script language=javascript>
          function ckeck(value){
                 if(value.length > 16){
                       alert('You can not enter more then 15 characters')
                       return false;
                  }
           return true;
           }
</script>

[Gibbs]

In PHP you can use strlen to get the length of a string. If your input is part of a form you could use strlen to check the length of your string.

 

For example:

<?php

$myvar = 'this is some text to test';

if (strlen($myvar) >= 15)
{
// Do this if too long
echo "String too long!";
}
else
{
// Do this is fine
echo "String is fine!";
}
?>

 

Edit: Ah, got beaten to it!

[Guest prozente]

jitesh javascript shouldn't be relied on since it's clientside scripting.

 

verN what you're wanting is what Orio posted.

[clown[NOR]]

why not just limit the <input> to 15?

 

<input name="textfield" type="text" maxlength="15" />

[tauchai83]

For good practice, the one posted by Orio is the best way.

 

 

[Guest prozente]

link=topic=135671.msg572588#msg572588 date=1176373910]

why not just limit the <input> to 15?

 

<input name="textfield" type="text" maxlength="15" />

 

clown[NOT], this can be changed by the user so it can't be relied on.

[clown[NOR]]

oh ok... didnt know that... thanks for letting me know =)