Question 1

How do I add custom validation in ngx schema form?

Accepted Answer

Define a validators map in your component and bind it to the form's validators input. Each validator is a function that takes the field value, property, and form object, returning null if valid or an error object, as shown in the password check example.

Question 2

Ngx schema form or angular reactive forms: which is better?

Accepted Answer

Use ngx schema form for dynamic, schema-based forms where structure changes frequently, like admin panels. For static, manually controlled forms, Angular reactive forms are simpler and avoid JSON overhead.

Question 3

How to conditionally show or hide fields in ngx schema form?

Accepted Answer

Use the visibleIf property in the JSON schema to define conditions based on other field values. For instance, set visibleIf to make a field appear only when another field has a specific value, as demonstrated in the newsletter registration example.

Question 4

Is ngx schema form compatible with the latest Angular versions?

Accepted Answer

Version 2.x supports Angular >=6, but always check the GitHub repository for updates on newer Angular releases and peer dependencies, as compatibility might require version-specific adjustments.

Question 5

How to create a custom widget for a date picker in ngx schema form?

Accepted Answer

Extend a base widget class like StringWidget, create an Angular component with your template, register it in a custom WidgetRegistry, and reference the widget id in your schema, similar to the TinyMCE widget setup.

Question 6

What are the performance implications of using ngx schema form?

Accepted Answer

For complex schemas with many conditional fields or custom bindings, performance can degrade due to dynamic rendering and validation. Optimize by simplifying schemas and using efficient widget implementations.

Form Generator based on JSON

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