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Hosein Pouyanmehr
Hosein Pouyanmehr

Posted on • Edited on • Originally published at contenidojs.com

Add image to draft-js editor (no plugin)

#react #wysiwyg #draftjs #contenidojs

What is this post about?

If you are implementing an editor, you probably need to add different sorts of media to your content, like images, audio, or video. The process of adding a non-text block (atomic block) to the draft-js is similar for all sorts of media. We'll learn how to work with atomic blocks and how to add image support to the editor.

Table of contents

Requirements

To be able to create an editor, the only requirement is to know how to set up a ReactJS (or NextJs) project. We're going to use
draft-js and contenido packages in this tutorial.

Draft JS and Contenido

Draft-js is a rich text editor framework for React. (Read More)

Contenido is a library with a set of tools to help you create your rich text editor on top of draft-js. We use contenido to boost the development process and avoid repetitive processes. Read this post to get familiar with contenido.

Installation

First, we will install React and Typescript (There will be a JS alternative for everything, so stick with your favorite one).

# typescript
npx create-react-app draft-text-alignment --template typescript

# javascript
npx create-react-app draft-text-alignment
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After the installation is done, install draft-js and contenido with this command:

# typescript
npm i draft-js @types/draft-js contenido@latest

# javascript
npm i draft-js  contenido@latest
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Create Editor component

After setting up the project, create a components folder in the src directory and then create the Editor component:

Typescript:

// src > components > Editor.tsx
import { useState } from 'react';
import { EditorState } from 'draft-js';
import { Editor } from 'contenido';

// Types
import type { FC } from 'react';

// Custom Types
export interface MediaEditorProps {}

const MediaEditor: FC<MediaEditorProps> = (props) => {
  // States
  const [editorState, setEditorState] = useState(EditorState.createEmpty());

  return (
    <div>
      <div>// We'll add the toolbar here</div>
      <div>
        <Editor editorState={editorState} onChange={setEditorState} />
      </div>
    </div>
  );
};
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Javascript:

// src > components > Editor.jsx
import { useState } from 'react';
import { EditorState } from 'draft-js';
import { Editor } from 'contenido';

const MediaEditor = (props) => {
  // States
  const [editorState, setEditorState] = useState(EditorState.createEmpty());

  return (
    <div>
      <div>// We'll add the toolbar here</div>
      <div>
        <Editor editorState={editorState} onChange={setEditorState} />
      </div>
    </div>
  );
};
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To make the editor much more visible add the border styles to the div:

...
      <div style={{
         border: '1px solid #252525',
         borderRadius: '0.5rem',
         padding: '0.5rem 1rem',
        }}
      >
        <Editor editorState={editorState} onChange={setEditorState} />
      </div>
...
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To have the styles work properly import contenido styles into your App.tsx (or _app.tsx in next.js).

...
// Styles
import 'contenido/dist/styles.css';
...
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Add Placeholder

Also adding a placeholder can be useful, so:

...
        <Editor
          editorState={editorState}
          onChange={setEditorState}
         placeholder='Write here...'
        />
...
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Steps Overview

Before implementing the image support, I like to clarify each step of adding the media to the editor.

In draft-js, the non-text block will be an atomic block. By default, the editor core only knows about the text and has no idea about the non-text blocks. When we add an atomic block to the editor, it'll ignore it until we say how to render that. To show the editor to render an atomic block, we need to decorate that block. Decorating in draft js is the process of finding and clarifying the final shape of an atomic block.

For example, to add an image block to the editor:

  1. We add an atomic block with the 'image' type (or whatever keyword you like).
  2. Then we define a function to find entities with 'image' type.
  3. Finally we'll use our custom Image component to render that.

Add Toolbar

Now, it's time to add the button to the toolbar.

Added lines are the same for both Javascript and Typescript:

// src > components > Editor.tsx
import { useState } from 'react';
import { EditorState } from 'draft-js';
import { Editor } from 'contenido';

// Types
import type { FC } from 'react';

// Custom Types
export interface MediaEditorProps {}

const MediaEditor: FC<MediaEditorProps> = (props) => {
  // States
  const [editorState, setEditorState] = useState(EditorState.createEmpty());

  return (
    <div>
      <div>
        <button
          style={{
            minWidth: '2rem',
            padding: '0.5rem',
            borderRadius: '0.5rem',
            border: 'none',
            cursor: 'pointer',
            textTransform: 'capitalize',
          }}
        >
          Add Image
        </button>
      </div>
      <div
        style={{
          border: '1px solid #252525',
          borderRadius: '0.5rem',
          padding: '0.5rem 1rem',
        }}
      >
        <Editor
          editorState={editorState}
          onChange={setEditorState}
          placeholder='Write here...'
        />
      </div>
    </div>
  );
};
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Using contenido, we can easily have the necessary utilities for the process. addImage utility helps us to add an atomic block to the editor with the type of 'image' and then using createDecorator in combination to the image component and the findEntitiesOf('image') leads to rendering images properly and in the way we like.

// src > components > Editor.tsx
....
import {
  Editor,
  addImage, // Import this utility
  createDecorator, // Import this utility
  findEntitiesOf, // Import this utility
} from 'contenido';
...
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So the editor component will be like this:

// src > components > Editor.tsx
import { useState } from 'react';
import { EditorState } from 'draft-js';
import { Editor, addImage, createDecorator, findEntitiesOf } from 'contenido';

// Types
import type { FC } from 'react';

// Custom Types
export interface MediaEditorProps {}

const MediaEditor: FC<MediaEditorProps> = (props) => {
  // States
  const [editorState, setEditorState] = useState(EditorState.createEmpty());

  return (
    <div>
      <div>
        <button
          style={{
            minWidth: '2rem',
            padding: '0.5rem',
            borderRadius: '0.5rem',
            border: 'none',
            cursor: 'pointer',
            textTransform: 'capitalize',
          }}
        >
          Add Image
        </button>
      </div>
      <div
        style={{
          border: '1px solid #252525',
          borderRadius: '0.5rem',
          padding: '0.5rem 1rem',
        }}
      >
        <Editor
          editorState={editorState}
          onChange={setEditorState}
          placeholder='Write here...'
        />
      </div>
    </div>
  );
};
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Handle Adding Image

Let's update the button event handlers to add an image to the editor.

// src > components > Editor.tsx
import { useState } from 'react';
import { EditorState } from 'draft-js';
import { Editor, addImage, createDecorator, findEntitiesOf } from 'contenido';

// Types
import type { FC } from 'react';

// Custom Types
export interface MediaEditorProps {}

const MediaEditor: FC<MediaEditorProps> = (props) => {
  // States
  const [editorState, setEditorState] = useState(EditorState.createEmpty());

  // Utilities
  const handleAddImage = () => {
    const imageProps = {
      src: 'https://picsum.photos/200/200',
      alt: 'Random image',
      style: { width: 200, height: 200 },
    };

    addImage(editorState, setEditorState, imageProps);
  };

  return (
    <div>
      <div>
        <button
          style={{
            minWidth: '2rem',
            padding: '0.5rem',
            borderRadius: '0.5rem',
            border: 'none',
            cursor: 'pointer',
            textTransform: 'capitalize',
          }}
          onMouseDown={(e) => {
            e.preventDefault();

            handleAddImage();
          }}
        >
          Add Image
        </button>
      </div>
      <div
        style={{
          border: '1px solid #252525',
          borderRadius: '0.5rem',
          padding: '0.5rem 1rem',
        }}
      >
        <Editor
          editorState={editorState}
          onChange={setEditorState}
          placeholder='Write here...'
        />
      </div>
    </div>
  );
};
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Note: In this example, we'll use hardcoded details for our image. In a real-world scenario, You can show a pop-up where the user enter the data, and then you can pass those to the handler.

If there is an upload phase in your application, you need to upload the image to the server first and then pass the link to that to the editor.

Create Image Component

Up to this point, The added image to the editor won't be visible as there is no decorator. To decorate the added media, we'll create the image component first.

JavaScript:

// src > components > Image.jsx
const Image = (props) => {
  if (blockType.blockType === 'image') {
    const { alt, src, style } = props;

    return <img alt={alt} src={src} />;
  }

  return <p>The atomic type is not supported in this demo!</p>;
};

export default Image;
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TypeScript:

// src > components > Image.tsx
// Types
import type { FC } from 'react';
import type { DecoratorComponentProps, ImageAttributes } from 'contenido';

const Image: FC<DecoratorComponentProps> = (props) => {
  if (props.blockType === 'image') {
    const { src, alt, style } = props as ImageAttributes;
    if (src && alt)
      return (
        <img alt={alt} src={src} width={style.width} height={style.height} />
      );
  }
  return <p>The atomic type is not supported in this demo!</p>;
};

export default Image;
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Create the Decorator

As we mentioned earlier, Decorating in draft js is the process of finding and clarifying the final shape of an atomic block.

This is how the decorator will look like (For both TS and JS):

// src > components > Editor.tsx
// Custom Components
import Image from './Image.tsx';

...
const decorators = createDecorator([
    {
      component: Image,
      strategy: findEntitiesOf('image');,
    },
  ]);
...
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It's an array an you can have multiple decorators for different types of atomic blocks.

Add Decorator to the State

We have all and it's time to put them together to see the result.

// src > components > Editor.tsx
import { useState } from 'react';
import { EditorState } from 'draft-js';
import { Editor, addImage, createDecorator, findEntitiesOf } from 'contenido';

// Types
import type { FC } from 'react';

// Custom Components
import Image from './Image.tsx'

// Custom Types
export interface MediaEditorProps {}

const MediaEditor: FC<MediaEditorProps> = (props) => {
  // Decorator
const decorators = createDecorator([
    {
      component: Image,
      strategy: findEntitiesOf('image');,
    },
  ]);

  // States
  const [editorState, setEditorState] = useState(EditorState.createEmpty(decorators));

  // Utilities
  const handleAddImage = () => {
    const imageProps = {
      src: 'https://picsum.photos/200/200',
      alt: 'Random image',
      style: { width: 200, height: 200 },
    };

    addImage(editorState, setEditorState, imageProps);
  };

  return (
    <div>
      <div>
        <button
          style={{
            minWidth: '2rem',
            padding: '0.5rem',
            borderRadius: '0.5rem',
            border: 'none',
            cursor: 'pointer',
            textTransform: 'capitalize',
          }}
          onMouseDown={(e) => {
            e.preventDefault();

            handleAddImage();
          }}
        >
          Add Image
        </button>
      </div>
      <div
        style={{
          border: '1px solid #252525',
          borderRadius: '0.5rem',
          padding: '0.5rem 1rem',
        }}
      >
        <Editor
          editorState={editorState}
          onChange={setEditorState}
          placeholder='Write here...'
        />
      </div>
    </div>
  );
};
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Result

This is the result:

A GIF of adding image to draft-js editor

You can also check the live demo!

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Hi! I'm Hosein Pouyanmehr. I enjoy sharing what I learn and what I find interesting. Let's connect on LinkedIn.

See my code interests on GitHub.

Top comments (2)

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olisa_isama_b3849eb38b010 profile image
Olisa Isama •

hi im having a problem with my draftjs editor. Anytime a mentionStrategy of the decorator instance takes and i immediately press space key with a letter, if i try to delete the letter by pressing backspace the cursor goes to the front of the the letter instead of deleting the it. It seems the letter after the space is not recognised when decorator stagey initially took place

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hpouyanmehr profile image
Hosein Pouyanmehr •

Hey Olisa,
Sorry for the delay (I didn't get any notification email about your comment).

If your issue still remains can you please create a repository for that or report the issue on GitHub, it is hard to reproduce that in this way.

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