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validation-microflows skillA

validation-microflows is agent-read markdown (skill) from mendixlabs/mxcli: Validation microflows for new/edit pages — attribute checks, feedback messages, and conditional validation chains. Use when a form needs input validation with messages shown against the fields..

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# Validation Microflows Skill

This skill provides guidance for creating validation microflows in MDL that validate user input on NewEdit pages and provide feedback to users.

## When to Use This Skill

Use this skill when:
- Creating validation logic for NewEdit pages
- Implementing attribute validation with feedback messages
- Building conditional validation chains
- Creating action microflows that call validation microflows

> **Nanoflow validation:** The same patterns apply to nanoflows (`create nanoflow` instead of `create microflow`). Use nanoflows for client-side validation when server roundtrips are unnecessary — validation feedback renders instantly without a network call.

## The Validation Pattern

Mendix validation follows a two-microflow pattern:

1. **VAL_Entity_Action** - The validation microflow that:
   - Takes an entity object as parameter
   - Validates each required field
   - Shows validation feedback on invalid fields
   - Returns a Boolean indicating overall validity

2. **ACT_Entity_Action** - The action microflow that:
   - Calls the validation microflow
   - Only proceeds with save/commit if validation passes
   - Closes the page on success

## MDL Syntax
…

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Source

GitHub

mendixlabs/mxcli · 124 stars · license Apache-2.0 · pushed 2026-09-24 · branch main

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