react-modular-form

A simple yet powerful react form library that is easily extendable and promotes reusability

yarn add react-modular-form

npm install react-modular-form

Why use React Modular Form?

RMF has first class typescript integration via "typed pathing". Other form libs on the internet assign field values with a magic string making refactoring a nightmare. RMF uses TypedPath<T> in the Field's path prop, to generate a type safe compiler aware string that can be refactored seamlessly.

RMF also exposes the underlying storage provider as IFormStateProvider meaning you can integrate the form state with any provider, such as Redux or localStorage.

What if im not using Typescript?

You can still use the form.paths object in JS however you will not get type safety or mass rename functionality. The path prop can also take a magic string value, in lieu of a TypedPath.

Example

Login.tsx

<Form<LoginDto> classes={styles}>
   {form =>
      <React.Fragment>
         <div styleName="login-content">
            <div styleName="login-title">Login</div>
            <Field
               path={form.paths.email}
               validation={[FormValidators.required, FormValidators.isEmail]}
               component={RenderInput}
               styleName="text-input"
               componentProps={{
                  placeholder: "Email"
               }} />
         </div>
         <div styleName="login-footer">
            <Button theme="outline" onClick={() => form.handleSubmit(data => this.doLogin(data))}>
               Login
            </Button>
         </div>
      </React.Fragment>
   }
</Form>

RenderInput.tsx

export class RenderInput extends React.PureComponent<InjectedField<string | number, RenderInputProps>> {
   static defaultProps: Partial<RenderInputProps> = {
      inputClass: "",
      align: "center"
   };
   inputRef: React.RefObject<HTMLInputElement>;

   constructor(props: InjectedField<string | number, RenderInputProps>) {
      super(props);
      this.inputRef = React.createRef<HTMLInputElement>();
   }

   componentDidMount() {
      if (this.props.autoFocus && this.inputRef.current) {
         this.inputRef.current.focus();
      }
   }

   render() {
      //is single field
      const props = this.props;
      const { inputClass, secure, align, autoFocus, required, classes, label, defaultValue, ...compProps } = props.componentProps();

      return (
         <FormFieldCommonBase
            className={compProps.className}
            label={label}
            error={this.props.form.field.error}
            touched={this.props.form.field.touched}
            required={required}
            type="forminput"
         >
            <input
               size={1}
               styleName={`input-class ${inputClass}`}
               {...compProps}
               {...props.fieldProps}
               value={props.fieldProps.value === null || props.fieldProps.value === undefined ? "" : props.fieldProps.value}
               disabled={compProps.disabled}
               ref={this.inputRef}
               align={props.align}
               onChange={e => {
                  if (compProps.type === "number") {
                     const num = parseFloat(e.target.value);
                     props.fieldProps.onChange(!isNaN(num) ? num : null);
                  } else {
                     props.fieldProps.onChange(e.target.value);
                  }
               }}
               type={secure ? "password" : compProps.type || "text"}
            />
         </FormFieldCommonBase>
      );
   }
}

export interface RenderInputProps extends CommonComponentProps, React.InputHTMLAttributes<HTMLInputElement> {
   //single fields
   secure?: boolean;
   label?: string;
   inputClass?: string;
   disabled?: boolean;
   required?: boolean;
   autoFocus?: boolean;
   align?: "left" | "center" | "right";
}

Alternatively, you may decorate your class component with @FormFactory(FormPropsConfig<TFormValue>) to inject the InjectedForm values as props accessible to the entire class.

react-css-modules

RMF has built in support for react-css-modules. Simply pass your classes object to the classes prop on Form

<Form<LoginDto> classes={styles}>

Exports

Component	Description
Field	Represents an input component via prop component={...} and stores the value at path.
FieldArray	Denotes an array field. Takes a single function as child that must return a React.ReactNode.
Form	The root form component. These can be nested but cannot interact with each other.
FormFactory	A decorator to wrap a class component with Form.
IFieldFormatter	Interface to define a field formatter. Field formatters mutate the data passed between Field <--> state.
IFormStateProvider	Interface to define a custom state provider. Custom state providers are passed to Form or FormFactory.
InjectedField	Props injected into field components.
InjectedFieldArray	Props injected into field array components.
InjectedForm	Props injected by FormFactory.
FormValidators	Built in field validators. Custom validators can be defined and passed to the validation props as a single argument or an array of validators.
createTypedPath	Create a TypedPath object.