I have a requirement where before submitting the form (without clicking submit ), it should call the integration and validate the entered text , if incorrect data is present then throw validation on UI . Is it possible to call the integration with in interface?
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Yes. See here: docs.appian.com/.../Call_an_Integration.html
Will it validate the data without clicking on any button?
If you want to call it without the button click, then you will have to call it in the textField's saveInto parameter.
For the validations you can use the validations in the textfield().