How to limit the number of characters in a texbox

kullboys · **Joined:** Mon Jun 18, 2018 2:15 am **Posts:** 1

Hello everyone
Trying to limit the number of characters a textbox can accept. There is no MaxLength property available. I have tried using the TextBox that comes through "Add Control" but it has no option to attach a tag. To summarize I am looking for a textbox control that can be attached to a tag and that has a MaxLength kind of property.
Thanks.

stasKanRich · **Joined:** Tue Jun 05, 2018 12:10 pm **Posts:** 5

hi,

not sure if this fixes your problem but you can do this by the validation section in the Analog numeric. it has lower limit and upper limit.

stasKanRich · **Joined:** Tue Jun 05, 2018 12:10 pm **Posts:** 5

another idea.

create a new tag to have the "corected version"
so you will have two tags in your tags view:
yourOriginalTag ( data from where ever)
yourOriginalTag_corrected ( HMI tag will be changed by c#)

Code:

int minNum = 12 ;
int maxNum = 123 ;
var origTag = Globals.Tags.yourOriginalTag ;
var cappedTag = Globals.Tags.yourOriginalTag_corrected;

if   (Globals.Tags.yourOriginalTag.Value < minNum )
{
Globals.Tags.yourOriginalTag.Value = minNum ;
}

if   (Globals.Tags.yourOriginalTag.Value > maxNum )
{
Globals.Tags.yourOriginalTag.Value = maxNum ;
}

use the corrected in the textbox
and call that from some periodic/timed function from the screen ?

wlederer · **Joined:** Fri Jan 27, 2012 4:20 am **Posts:** 175

Hi, use script.
Globals.Tags.MyTag_rounded.Value =Math.Round((double)Globals.Tags.MyTag.Value,1);//rounds value to 1 decimal