Text field validation

Hello, I have this code and I am trying to add a regular expression to my component but did not works:

textfield = event.source.parent.getComponent('Text Field').text
search = event.source.parent.getComponent ('dropdown list').selectedStringValue


if search=='Number':
       if search != search.validationPattern("[a-zA-Z]{2,256}"):
             system.gui.messageBox('Incorrect , only numbers')
      else:
            do something


thanks

Paste your code, then select it again so the code (and only the code) is completely highlighted. Then click the pre-formatted text button. “thanks” would be outside the code block…

I think , the code has the format, so you can read now better

You’ll need to use python’s re module. Strings don’t have a validationPattern method.

I imported, but now I just let :

textfield = event.source.parent.getComponent('Text Field').text
search = event.source.parent.getComponent ('dropdown list').selectedStringValue


if search=='Number':
       if search.validationPattern != "[a-zA-Z]{2,256}":
             system.gui.messageBox('Incorrect , only numbers')
      else:
            do something

Also, (but I am not a Python expert), are you searching the correct variable?

You are testing search. I think maybe you should be testing textfield.

Yes, but textfield is also a string. It doesn’t have a validationPattern property or method.
Something like this:

import re

......

if re.match(r'[A-Za-z]{2,256}', textfield):
    do something

https://docs.python.org/2.7/library/re.html

1 Like

Why not use the formatted text field?
image

3 Likes

Because in this version 8.1 I don’t have these options

Huh? I’m using v8.1.14 right now, and I’ve been using this since v7.9.

EDIT:
There is a whole different component called the formatted text field
Vision - Formatted Text Field - Ignition User Manual 8.1 - Ignition Documentation (inductiveautomation.com)

1 Like

O but I see why, I was using the normal text field component, thanks

But I also have differents strings in the dropdown list, that is why I was trying to do it by script

I suspect that you are creating a strange or bad user interface. Sit back, have a look at professionally designed applications, how the work flows, how the data is stored and start again.

It works, but I want to sent a message that only letters or numbers, but I write the regular expression from the properties of the component.

I don’t understand what you are saying/asking.

He wants the dropdown list to determine the regex pattern I think

Yes, that

That should be easy. Set your dropdown labels, like “Numbers only”, then set the string value for that label as the regex. In a property change event, set the formatted text field’s validation pattern according to the selected drop down item.

if event.propertyName ==  'selectedLabel':
    regex = event.source.selectedStringValue
    event.source.parent.getComponent('Formatted Text Field').validationPattern = regex

And If I want validate by script a Formatted Text Field like :


If textfield == 'regular expresion' 
    Send message

The equals operator doesn’t do regular expressions. You must use the re module and its .match() method. Like the example I gave.