KNIME WebPortal User Input Validation via Text Disclaimer and Port Deactivation

When creating a multi-page data app you can in each widget node check whether the value inserted in the user meets some requirement. Despite this you need a more complex logic when you need to validate combination of values of different widgets. To solve this you need to place validation nested components in the following component page to check the input inserted in the previous component. Then you can trigger text output widgets and deactivate ports to make the data app stop on a custom error so that the user is informed and can go back to change those settings.

External resources

• Validation in Component Output - KNIME Froum