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A simple images uploader applied Render Props pattern with react

A simple images uploader applied Render Props pattern with react

react-images-uploading

The simple images uploader applied Render Props pattern that allows you to fully control UI component and behaviors.

The simple images uploader applied Render Props pattern. (You can read more about this pattern here).

This approach allows you to fully control UI component and behaviours.

Installation

npm

npm install --save react-images-uploading

yarn

yarn add react-images-uploading

Usage

You can check out the basic demo here:

Basic

import React from 'react';
import ImageUploading from 'react-images-uploading';

export function App() {
  const [images, setImages] = React.useState([]);
  const maxNumber = 69;

  const onChange = (imageList, addUpdateIndex) => {
    // data for submit
    console.log(imageList, addUpdateIndex);
    setImages(imageList);
  };

  return (
    <div className="App">
      <ImageUploading
        multiple
        value={images}
        onChange={onChange}
        maxNumber={maxNumber}
        dataURLKey="data_url"
      >
        {({
          imageList,
          onImageUpload,
          onImageRemoveAll,
          onImageUpdate,
          onImageRemove,
          isDragging,
          dragProps,
        }) => (
          // write your building UI
          <div className="upload__image-wrapper">
            <button
              style={isDragging ? { color: 'red' } : undefined}
              onClick={onImageUpload}
              {...dragProps}
            >
              Click or Drop here
            </button>
            &nbsp;
            <button onClick={onImageRemoveAll}>Remove all images</button>
            {imageList.map((image, index) => (
              <div key={index} className="image-item">
                <img src={image['data_url']} alt="" width="100" />
                <div className="image-item__btn-wrapper">
                  <button onClick={() => onImageUpdate(index)}>Update</button>
                  <button onClick={() => onImageRemove(index)}>Remove</button>
                </div>
              </div>
            ))}
          </div>
        )}
      </ImageUploading>
    </div>
  );
}

Validation

...
  {({ imageList, onImageUpload, onImageRemoveAll, errors }) => (
    errors && <div>
      {errors.maxNumber && <span>Number of selected images exceed maxNumber</span>}
      {errors.acceptType && <span>Your selected file type is not allow</span>}
      {errors.maxFileSize && <span>Selected file size exceed maxFileSize</span>}
      {errors.resolution && <span>Selected file is not match your desired resolution</span>}
    </div>
  )}
...

Drag and Drop

...
  {({ imageList, dragProps, isDragging }) => (
    <div {...dragProps}>
      {isDragging ? "Drop here please" : "Upload space"}
      {imageList.map((image, index) => (
        <img key={index} src={image.data_url} />
      ))}
    </div>
  )}
...

Props

parameter type options default description
value array [] List of images
onChange function (imageList, addUpdateIndex) => void Called when add, update or delete action is called
dataURLKey string dataURL Customized field name that base64 of selected image is assigned to
multiple boolean false Set true for multiple chooses
maxNumber number 1000 Number of images user can select if mode = multiple
onError function (errors, files) => void Called when it has errors
acceptType array ['jpg', 'gif', 'png'] [] The file extension(s) to upload
maxFileSize number Max image size (Byte) and it is used in validation
resolutionType string 'absolute' | 'less' | 'more' | 'ratio' Using for image validation with provided width & height
resolutionWidth number > 0
resolutionHeight number > 0

Note

resolutionType

value description
absolute image's width === resolutionWidth && image's height === resolutionHeight
ratio (resolutionWidth / resolutionHeight) === (image width / image height)
less image's width < resolutionWidth && image's height < resolutionHeight
more image's width > resolutionWidth && image's height > resolutionHeight

Exported options

parameter type description
imageList array List of images to render.
onImageUpload function Called when an element is clicks and triggers to open a file dialog
onImageRemoveAll function Called when removing all images
onImageUpdate (updateIndex: number) => void Called when updating an image at updateIndex.
onImageRemove (deleteIndex: number | number[]) => void Called when removing one or list image.
errors object Exported object of validation
dragProps object Native element props for drag and drop feature
isDragging boolean "true" if an image is being dragged

GitHub

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