Set the form to not allow duplicate values.

In the process of building YIDA applications, you may encounter the following problems.

• In the CRM system, customer information can only be entered once, and duplicate customer information is not allowed.
• In the lottery system, the sign-in person is only allowed once, and repeated sign-in is not allowed.
• In the daily newspaper (weekly) system, the author is only allowed to submit once a day (weekly) and not allowed to submit repeatedly.

Prerequisites

This tutorial uses the form formula of YIDA. You can first understand the followingForm formula.

• Verification function

• EXIST

Effect

Implementation steps

Create a common form page

Create a common form page. For more information, seeCommon form.

Drag the following components into the canvas area.

• Single line text: name the product name

Add Form verification

Add to form settings in the top ribbonForm verification.

You can search for the formula.

Select the verification function, select the fields we need to verify, and click:

Set block submission and set prompt information:

Save page

Video tutorial

Try it online