Samuel,
The user might have copied from another app and pasted into the field.
The solution is to strip control characters from the user input. As you may
know, there are a lot of ways to do that and dependent on the use case. For
example, if it’s a multiline text input control (textarea), you may want to
keep certain characters like carriage returns, line feeds and tabs.
One example of stripping all control characters using pure Java:
String.replaceAll("\\p{Cntrl}", "”);
… and one example of stripping every control character, except for CR, LF and
TAB:
String.replaceAll("[\\p{Cntrl}^\r\n\t]+", "");
I am sure NSString has methods for that...
Cheers,
Flavio
> On 13/09/2016, at 09:40, Samuel Pelletier <[email protected]> wrote:
>
> Hi,
>
> I just encountered a strange error where a user managed to put a DEL char
> inside a text field. This char raise an SQL Exception in the server.
>
> First, I really would like to know how they manage to do this ! I do not even
> know how to put a DEL (code 127) inside text with the keyboard. I had some
> case with other control char in the past too.
>
> Second, is there a wonder way to filter these or a Javascript method to
> prevent them from the source, or any suggestion to handle this ?
>
> Real users are alway a source of unpredicted challenges.
>
> Thank,
>
> Samuel
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