react-linked-state-adapter

This package provides two mixins, AdaptedLinkedStateMixin and ReactLinkAdapterMixin, that will help React applications to continue the use of ReactLink after it is deprecated/removed.

As of React v15, ReactLink is being deprecated; the LinkedStateMixin mixin, and the valueLink and checkedLink props on <input> components will be removed in future releases of React. The recommended way to achieve two-way binding now is by explicitly setting the value and change handler of the input component (see the Two-Way Binding Helpers doc).

The two mixins here provides a few easy ways for you to convert all the ReactLink in your application into the value/checked and onChange props:

• AdaptedLinkedStateMixin - this mixin provides a linkState() and a adaptReactLink() functions. This allows you to enable two-way binding in a way that is very similar to the LinkedStateMixin

• ReactLinkAdapterMixin - this mixin allows a component (usually a higher-order component around an <input> element) to accept two-way binding props through both the valueLink/checkedLink fashion and the value/checked and onChange way

There are a few reasons you may want to use this package:

• you are upgrading an existing React application to React 15 or above but do not want to write additional change handlers for all your linked states
• you like the simplicity of the ReactLink and LinkedStateMixin
• you want your input component to support two-way binding in the ReactLink way and the value/onChange handler way at the same time

Getting Started

Installation

Install the react-linked-state-adapter npm package:

npm install --save react-linked-state-adapter

Basic Usage

Using AdaptedLinkedStateMixin

const { AdaptedLinkedStateMixin } = require('react-linked-state-adapter');
const InputForm = React.createClass({
    mixins : [AdaptedLinkedStateMixin],
    getInitialState : function() {
      return { input_txt : 'some text' };
    },
    render : function() {
      // NOTE: how the 'valueLink' prop is now split into the 'value' and 'onChange' props
      return <input type="text" value={ this.linkState('input_txt').value } onChange={ this.linkState('input_txt').onValueChange }/>
    }
});

Using ReactLinkAdapterMixin

const { ReactLinkAdapterMixin } = require('react-linked-state-adapter');
const TextInput = React.createClass({
  mixins : [ReactLinkAdapterMixin],
  render : function() {
    return <input type="text" value={ this.value() } onChange={ this.onChange() }/>;
  }
});

// now you can use valueLink to create the TextInput
<TextInput valueLink={ this.linkState('value') }/>
// or you may use the 'value' and 'onChange' props instead
<TextInput value={ this.state.value } onChange={ this.someChangeHandler }/>

AdaptedLinkedStateMixin

AdaptedLinkedStateMixin adds two functions to the component - linkState() and adaptReactLink().

• linkState(key)

  This behaves exactly like the linkState() in LinkedStateMixin. It creates an object containing the value of the state (as indicated by the key parameter) and change handlers for updating that state.

  Example:

  <input type="text" value={ this.linkState('input_txt').value } onChange={ this.linkState('input_txt').onValueChange }/>

• adaptReactLink(link)

  This converts a ReactLink from the LinkedStateMixin into a link that can be used with the value/checked and onChange props.

  Example:

  const SomeInput = React.createClass({
    mixins : [AdaptedLinkedStateMixin],
    render : function() {
      var adaptedLink = this.adaptReactLink(this.props.someValueLink);
      return <input type="text" value={ adaptedLink.value } onChange={ adaptedLink.onValueChange }/>;
    }
  });

Using Checkbox and Radio Button

When using the linked state with checkbox and radio input element, be sure to:

• set the checked prop instead of the value prop
• use the linked state's onCheckedChange handler instead of the onValueChange handler

Example:

<input type="checkbox" checked={ this.linkState("checked").value } onChange={ this.linkState("checked").onCheckedChange }/>

ReactLinkAdapterMixin

Component using this mixin can accept either a valueLink/checkedLink prop OR a combination of value/checked and onChange props. The mixin adds three functions to the component:

• value()

  Returns the value provided through either the value prop or the valueLink prop. Use this function to pass the linked value to the <input> element (except for checkbox and radio)

  <input type="text" value={ this.value() }/>

• checked()

  Returns the checked value provided through either the checked prop or the checkedLink prop. Only use this function to pass the checked flag to <input> element of type checkbox and radio

  <input type="checkbox" checked={ this.checked() }/>;

• onChange()

  Returns the onChange change handler. Use this function to pass the change handler to the <input> element. This function automatically determined whether to return a handler for value change or checked change based on the props provided

  <input type="text" onChange={ this.onChange() }/>;

Migrating from ReactLink and LinkedStateMixin

Example 1

Below shows how you can migrate from using the LinkedStateMixin to AdaptedLinkedStateMixin in a component that directly consumes the linked state.

Before:

const LinkedStateMixin = require('react-addons-linked-state-mixin');
const TextInput = React.createClass({
  mixins : [LinkedStateMixin],
  render : function() {
    return <input type="text" valueLink={ this.linkState('txt_input') }/>;
  }
});

After:

const { AdaptedLinkedStateMixin } = require('react-linked-state-adapter');
const TextInput = React.createClass({
  mixins : [AdaptedLinkedStateMixin],
  render : function() {
    return <input type="text" value={ this.linkState('txt_input').value } onChange={ this.linkState('txt_input').onValueChange }/>;
  }
});

Example 2

Below shows how you only need to migrate the lower level input component while leaving your higher level component unchanged.

Before:

const LinkedStateMixin = require('react-addons-linked-state-mixin');
const StyledTextInput = React.createClass({
  render : function() {
    return (
      <div>
        <input type="text" valueLink={ this.props.valueLink }/>
      </div>
    );
  }
});

const InputForm = React.createClass({
  mixins : [LinkedStateMixin],
  render : function() {
    return <StyledTextInput valueLink={ this.linkState('txt_input') }/>
  }
});

After:

const { ReactLinkAdapterMixin } = require('react-addons-linked-state-mixin');
// NOTE: keeping the name LinkedStateMixin here so that the InputForm component can remain the same
const LinkedStateMixin = require('react-addons-linked-state-mixin').AdaptedLinkedStateMixin;
const StyledTextInput = React.createClass({
  mixins : [ReactLinkAdapterMixin],
  render : function() {
    return (
      <div>
        <input type="text" value={ this.value() } onChange={ this.onChange() }/>
      </div>
    );
  }
});

const InputForm = React.createClass({
  mixins : [LinkedStateMixin],
  render : function() {
    return <StyledTextInput valueLink={ this.linkState('txt_input') }/>
  }
});

Issues

Use Github issues for bugs and requests.

Changelog

Changes are tracked as Github releases.

License

MIT