How to insert / upload image (update entity and blocks) in Draft.js?

问题

I am trying to insert image to Draft.js editor.

Based on my understanding, I need update entity by mergeData and blocks by mergeBlockData. (I am not sure)

Now I am trying to use mergeBlockData to insert a block.

mergeBlockData(
  contentState: ContentState,
  selectionState: SelectionState,
  blockData: Map<any, any>
): ContentState

Please read comment in the code.

import { Map } from 'immutable';

const selection = this.state.editorState.getSelection();
const contentState = this.state.editorState.getCurrentContent();

console.log(convertToRaw(contentState));  // for example, I have 3 blocks

const blockData = Map({ ov72: {  // here how to generate a random valid key?
  "key": "ov72",
  "text": " ",
  "type": "atomic",
  "depth": 0,
  "inlineStyleRanges": [],
  "entityRanges": [{
    "offset": 0,
    "length": 1,
    "key": 1
  }],
  "data": {}
}});
const newContentState = Modifier.mergeBlockData(contentState, selection, blockData);

console.log(convertToRaw(newContentState));  // here is wrong, still 3 blocks. Also original blocks have no change

const newEditorState = EditorState.push(this.state.editorState, newContentState);

回答1:

Took a while to figure out how to insert image.

  insertImage = (editorState, base64) => {
    const contentState = editorState.getCurrentContent();
    const contentStateWithEntity = contentState.createEntity(
      'image',
      'IMMUTABLE',
      { src: base64 },
    );
    const entityKey = contentStateWithEntity.getLastCreatedEntityKey();
    const newEditorState = EditorState.set(
      editorState,
      { currentContent: contentStateWithEntity },
    );
    return AtomicBlockUtils.insertAtomicBlock(newEditorState, entityKey, ' ');
  };

Then you can use

const base64 = 'aValidBase64String';
const newEditorState = this.insertImage(this.state.editorState, base64);
this.setState({ editorState: newEditorState });

For render image, you can use Draft.js image plugin.

Live demo: codesandbox

The demo inserts a Twitter logo image.

If you want to insert a image from local file, you can try to use FileReader API to get that base64.

For how to get base64, it is simple, check

Live demo: jsbin

Now go ahead to put them together, you can upload image from local file!

回答2:

If you want to insert a new Block then you probably would want to use ContentBlock and not mergeBlockData.

ContentBlock: https://draftjs.org/docs/api-reference-content-block.html#content

Please give this snippet a try.

import { genKey } from 'draft-js'

addNewBlock(editorState) {
  const text = 'Alpha';
  const block = new ContentBlock({
    key: genKey(),
    type: 'unstyled',
    text,
  });

  const contentState = editorState.getCurrentContent();
  const blockMap = contentState.getBlockMap().set(block.key, block);                   

  return EditorState.push(editorState, contentState.set('blockMap', blockMap));
}

回答3:

If you are using draft-js image plugin, you can achieve this as follows.

Get the base64 of your image as @Hongbo Miao explained.

const imagePlugin = createImagePlugin();//initialize image plugin
const base64 = 'aValidBase64String';
const newEditorState = imagePlugin.addImage(this.state.editorState, base64);
this.setState({ editorState: newEditorState });

来源：https://stackoverflow.com/questions/47604432/how-to-insert-upload-image-update-entity-and-blocks-in-draft-js

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