React Page Maker

React-page-maker, A drag-drop featured lib which will help you to build the page layout and generate the markup or JSON out of it. You can store this JSON at server side or anywhere based on your requirement and use it later for Preview.

Library is designed in such a way that you will get enough flexibility in terms of defining any type of elements/layout which you are going to use throughout the application.

If you are building custom layout builder/dashboard then probably you are in the right place! :)

Install

npm install --save react-page-maker

How to use

Define the type of elements
Create and Register elements/layouts
Render Palette and Canvas
Working example - Git repo

Define the type of elements

Every element/layout has mandatory type property. Based on type we decide what component to load for that element/layout.
```
// Const.js
export const elements = {
  TEXTBOX: 'TEXTBOX',
  LAYOUT_GRID_1_2: 'LAYOUT_GRID_1_2'
};
```

Create and Register elements/Layouts

Create element

Every Elements should have three versions defined.

palette version
canvas version
preview version

In palette and canvas version element should have drag feature which can be achieved through Draggable component.

// DraggableTextbox.js
import React from 'react';
import PropTypes from 'prop-types';
import { FormGroup, Input, Label } from 'reactstrap';
import { Draggable } from 'react-page-maker'; // to give drag behaviour

const DraggableTextbox = (props) => {
  // `showBasicContent` is default prop passed by `Palette` component
  const { showBasicContent, showPreview, name } = props;

  if (showBasicContent) { // palette version - content to be shown in palette list
    return (
      <Draggable {...props}>
        <span>{name}</span>
      </Draggable>
    );
  }

  if (showPreview) { // preview version - content to be shown in preview mode - end result, no need of `Draggable`
    return (
      <FormGroup>
        <Label>{name}</Label>
        <Input type="text" />
      </FormGroup>
    );
  }

  return ( // canvas version - content to be shown in canvas
    <Draggable {...props}>
      <FormGroup>
        <Label>{name}</Label>
        <Input type="text" placeholder="Type here" />
      </FormGroup>
    </Draggable>
  );
};

DraggableTextbox.propTypes = {
  name: PropTypes.string,
  showBasicContent: PropTypes.bool
};

export default DraggableTextbox;

Based on showBasicContent prop you can manage what content to be shown in Canvas and Palette. This is default prop which will be available for all palette elements.

Note- For drag behaviour, wrap the element with Draggable component and make sure all props gets passed to it.

Create Layout (If you want more complex/nested structure)

Here the steps are very similar to element, after all layouts are also one type of element but the only difference is that they have some dropzone wherein you can drop a elements to form the page structure. To create such dropezon we have Dropzone component. Layout can have one or many dropzones but make sure each dropzone has unique identifier.

  // DraggableGrid_1_2.js
  import { Draggable, Dropzone } from 'react-page-maker';

  const DragItemGridLayout = (props) => {
    // make sure you are passing `dropzoneProps` prop to dropzone
    const { showBasicContent, showPreview, dropzoneProps, childNode, ...rest } = props;

    if (showBasicContent) { // content to be shown in palette
      return (
        <Draggable {...props} >
          <span>{ rest.name }</span>
        </Draggable>
      );
    }

    if (showPreview) { // content to be shown in preview mode - end result
      return (
        <Row className="row">
          <Col sm="6">
            {childNode['canvas-1-1'] && childNode['canvas-1-1'].map(e => e)}
          </Col>
          <Col sm="6">
            {childNode['canvas-1-2'] && childNode['canvas-1-2'].map(e => e)}
          </Col>
        </Row>
      )
    }

    return ( // content to be shown in canvas
      <Draggable {...props} >
        <span>{ rest.name }</span>
        <div className="grid-layout">
          <div className="row">
            <div className="col-sm-6">
              <Dropzone {...dropzoneProps} id="canvas-1-1" />
            </div>
            <div className="col-sm-6">
              <Dropzone {...dropzoneProps} id="canvas-1-2" />
            </div>
          </div>
        </div>
      </Draggable>
    );
  };

Note -

Provide id and dropzoneProps to every dropzone
dropzoneProps is by default available under props

Register Elements

import { registerPaletteElements } from 'react-page-maker';

// pass array of elements which we want to use across
registerPaletteElements([{
  type: elements.TEXTBOX, // import from const.js
  component: DraggableTextbox // import from DraggableTextbox.js
}, {
  type: elements.LAYOUT_GRID_1_2,
  component: DragItemGridLayoutR1C2 // import from DraggableGrid_1_2.js
}]);

After this step, the application will be aware what type of elements we have and based on this types we can create as many fields required. e.g. from elements.TEXTBOX we can create any text field (First Name, Last Name, etc.)

Note - Call registerPaletteElements function before you render palette. e.g. Inside constructor or componentWillMount

Render Palette and Canvas

Pass list of elements which we need to show inside palette (since not every time we will be using all elements).

import { Palette, Canvas } from 'react-page-maker';

class PageConfigurator extends Component {
  constructor(props) {
    super(props);
    this.registerPaletteElements();
  }

  registerPaletteElements = () => {
    registerPaletteElements([{ // <-- registered palette elements
      type: elements.TEXTBOX,
      component: DraggableTextbox
    }, {
      type: elements.LAYOUT_GRID_1_2,
      component: DragItemGridLayoutR1C2
    }]);
  }

  paletteElements = [{ // <-- palette elements to be shown
    id: 'f1', // make sure ID is unique
    name: 'Input Field',
    type: elements.TEXTBOX
  }, {
    id: 'g1',
    name: 'Two Dropzones',
    type: elements.LAYOUT_GRID_1_2
  }]

  render() {
    return (
      <div className="container-fluid">
        <div className="row">
          <div className="col-sm-8 canvas-wrapper">
            <Canvas />
          </div>
          <div className="col-sm-4 palette-wrapper">
            <Palette paletteElements={this.paletteElements} />
          </div>
        </div>
      </div>
    );
  }
}

export default PageConfigurator;

Note - Make sure every palette elements has unique ID.

By now, you would be able to see Canvas and Palette (with those provided elements).

Components

Draggable

Prop	Type	Description
id	String	ID of an element
name	String	Name of an element
draggable	Boolean	Manage element drag behaviour, default is true
type	String	Defines type of an element
payload	Object	Any custom data that you want to pass

Palette

Prop Type Description

paletteElements Array Array of element(Object) to be shown inside palette

Prop	Type	Description
paletteElements	Array	Array of element(Object) to be shown inside palette

Dropzone

Prop	Type	Description
id	String	ID of a dropzone
capacity	Number	Maximum number of elements dropzone can maintain
allowHorizontal	Bool	Allow horizontal drop, default is vertical
initialElements	Array	Array of element(Object) to be prepopulate inside dropzone, here format will be similar to palette elements
placeholder	String	Text to be shown when dropzone is emepty. Default value is `Drop Here.`
onDrop	Function	function gets triggered once element got dropped
onElementMove	Function	Function get called when we try to move the element from one dropzone to another

/*
 * function gets triggered once element got dropped
 * @param {Object} data - It holds element information
 * @param {Function} cb - A callback function, which helps to decide whether to add element or not.
 * if data is valid then call cb function to proceed else return false.
 * @param {Number} dropIndex - Position where element getting dropped
 * @param {Array} currentElements - Current elements which canvas holds
 * @returns {cb/Boolean}
 */
_onDrop = (data, cb, { dropIndex, currentElements }) => {
  //In order to mock user input I'm using `window.prompt`
  // in actual scenario we can add some async call to fetch data
  const name = window.prompt('Enter name of field');
  const id = window.prompt('Enter id of field');

  const result = cb({
    ...data,
    name: name || data.name,
    id: id || data.id
  });
}

/**
* Function get called when we try to move the element from one dropzone to another
* @param {Object} elementMoved - Data of element which has been moved
* @returns {Boolean}
*/
_onElementMove = (elementMoved) => (true);

<Dropzone
  id="d1"
  capacity={4}
  initialElements={[]}
  placeholder="Drop Here"
  onDrop={this._onDrop}
  onElementMove={this._onElementMove}
  {...dropzoneProps}
/>

Note - If is there any situation where you need to update the dropzone state manually then you can use dangerouslySetElements function, this gives you direct access to dropzone state. May be you can refer state.updateElement|state.removeElement API if that fulfills your requirement.

  onSomeAction = () => {
    // Note - make sure you are passing valid data else state service may break

    // 1 - pass an array if you are just going to reset the dropzone
    const current = this.currentDropzone.current;
    current && current.dangerouslySetElements([element1, element2]);
    // element type should be similar to what you are passing in palette

    // or

    // 2 - pass a function which will give you the current elements that dropzone holds, and then you can make necessary tweaks
    const current = this.currentDropzone.current;
    current && current.dangerouslySetElements((currentElements) => currentElements
      .map(doSomeTweaks));
  }

  <Dropzone
    ref={this.currentDropzone}
    {...requiredProps}
  />

Canvas

This is a top level dropzone element from where we actually starts drag-drop. Canvas is extended version of Dropzone with some default properties (e.g. ID) defined.

Trash

You can use this component to have feature of trash/delete box. Once element dropped inside Trash then it gets removed from canvas and state.

Prop	Type	Description
onBeforeTrash	function	cb which invoke just before element being trashed
onAfterTrash	function	cb which invoke after element is trashed

Syntax

/**
  * Function get trigger just before element getting trashed
  * @param {Object} elementToBeTrashed - Data of element which is going to be trashed
  * @returns {Boolean}
  */
  _onBeforeTrash = (elementToBeTrashed) => {
    return true;
  }

  /**
  * Success function which gets triggered once element has been trashed
  */
  _onAfterTrash = () => {
    console.log('Updated state', state.getState());
  }

  <Trash onBeforeTrash={this._onBeforeTrash} onAfterTrash={this._onAfterTrash} />

Preview

Use this component to show the preview version of current state (End Output or markup). Make sure every draggable elements is returning something on showPreview

Syntax
```
/* how to use */
<Preview />

/* OR - for more layout flexibility */
<Preview>
  {
    ({ children }) => (
      <div>
        Custom Layout
        {children}
      </div>
    )
  }
</Preview>
```
Note - Refer Create and Register elements/layouts section to know how we define preview version inside draggable element/layout.

API

State

It provide access to the state object which holds all the meta data.

Prop	Type	Description
getState	function	returns current state of canvas
getStorableState	function	returns current state which can be stored at servers side for future use
clearState	function	flush current state
getElementParent	function	returns parent layout element
getElement	function	returns details of element
removeElement	function	remove element from tree
updateElement	function	update specific element
addEventListener	function	to add event, supported events `change, flush, removeElement, updateElement`
removeEventListener	function	to remove event, pass proper event cb