mobx-schema-form Overview

mobx-schema-form renders form widgets (by default Material Design) based on schema and form definition in json-schema-form format. Includes intelligent real-time validation and display of validation error message in each widget.

mobx-schema-form is a syntax-compatible wrapper around the low-level utils of react-schema-form. By default, mobx-schema-form uses React-Toolbox widgets instead of material-ui and wires up the widgets to work with MobX FormStore. It also adds some improvements primarily in the area of validation.

Features

  • React-Toolbox is faster and lighter than Material-UI and uses easily themable/customizable CSS Modules instead of inline styles - see Styling.
  • Declarative form rendering and validation with added support for conditionally-rendered alternate widgets for the same model property.
  • Virtually zero code for a complete implementation
  • Mobx-reactive conditional rendering of fields or groups of fields in fieldsets
  • Easy styling/customization of each widget on a per-field basis
  • Provides facilities for form-wide validation (i.e. of required fields when you hit the Save button) in addition to intelligent real-time field-level validation.
  • Fields that are currently not rendered (based on their conditions) are omitted from form-wide validation.
  • In addition to the built-in schema/tv4-based validation, supports custom validations and server-returned validation errors.
  • Values from text, etc input fields have their white space trimmed on blur and non-numeric characters cannot be entered into form fields with schema type of numeric/integer (but negative integers and decimals such as 1.01 can still be keyed-in correctly).
  • Radios or Dropdowns can be used for nullable Boolean values with automatic datatype conversion from strings such as 'off, no, false' to false and empty strings to null.

Requirements

mobx-schema-form requires React, MobX 2.2+, 3.x, 4.x or 5.x, mobx-react 3.5+, 4.x or 5.x and expects models to be instances of MobX FormStore or objects in the modelShape (with at minimum data and dataErrors object properties). Unlike FormStore, which is published as a UMD module to NPM, mobx-schema-form is published in CommonJS ES5 format. In addition, default use of MobxSchemaForm requires React-Toolbox, which in turn requires your environment to be able to load SASS (React-Toolbox 1.x) or PostCSS/cssnext (React-Toolbox 2.x) files via require/import - i.e. properly configured webpack.

Installation

npm install --save mobx-schema-form

Note that npm will issue a warning about an unmet peer dependency of material-ui for react-schema-form. You can safely ignore it. The portion of react-schema-form we use does not require material-ui.

Minimal Usage Example

import React from 'react';
import { observer } from 'mobx-react';
import { MobxSchemaForm } from 'mobx-schema-form';
import SaveButton from 'mobx-schema-form/lib/SaveButton';
import model from './myStore.js'; // a singleton instance of MobX FormStore

/* eslint-disable quotes, quote-props, comma-dangle */
// typically this would be in an external static json file
const schemaJson = {
  "schema": {
    "type": "object",
    "title": "MySchema",
    "properties": {
      "email": {
        "title": "Email",
        "type": "string",
        "pattern": "^[A-Za-z0-9!#-'\\*\\+\\-/=\\?\\^_`\\{-~]+(\\.[A-Za-z0-9!#-'\\*\\+\\-/=\\?\\^_`\\{-~]+)*@[A-Za-z0-9!#-'\\*\\+\\-/=\\?\\^_`\\{-~]+(\\.[A-Za-z0-9!#-'\\*\\+\\-/=\\?\\^_`\\{-~]+)*$",
        "validationMessage": {
          "default":"Email must be of proper format: abc@xyz.com",
          "302": "Email is required"
        }
      }
    },
    "required": ["email"]
  },
  "form": [
    {
      "key": "email",
      "type": "email"
    }
  ]
};
/* eslint-enable */

@observer class MyForm extends React.Component {
  render() {
    return (
      <form>
        <MobxSchemaForm
          schema={schemaJson.schema}
          form={schemaJson.form}
          model={model}
        />
        <SaveButton
          model={model}
          options={
          { allowCreate: true, saveAll: true }
          }
          label="Save"
          disabled={!model.status.canSave}
          type="submit"
        />
      </form>
    );
  }
}

Note that MobxSchemaForm uses the same props as react-schema-form's SchemaForm, except what react-schema-form calls model is actually model.data in mobx-schema-form. It also supports 'option' for compatibility with SchemaForm, though the correct form in MobxSchemaForm is 'options' plural.

React Hot Loader 3 compatibility

If you use react-hot-loader, you may find that Radio widgets are non-functional. In the current beta of React-Toolbox 2.x, you can work-around this issue by placing this code somewhere in your app (like an index.js):

import { overrideComponentTypeChecker } from 'react-toolbox/lib/utils/is-component-of-type';

// Work-around for react-hot-loader issue in React-Toolbox - see https://github.com/react-toolbox/react-toolbox/pull/1164
overrideComponentTypeChecker((classType, reactElement) => {
  return reactElement && (
    reactElement.type === classType ||
    reactElement.type.name === classType.displayName
  );
});

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