Dynamically Add Images React Webpack

问题

I've been trying to figure out how to dynamically add images via React and Webpack. I have an image folder under src/images and a component under src/components/index. I'm using url-loader with the following config for webpack

    {
      test: /\.(png|jpg|)$/,
      loader: 'url-loader?limit=200000'
    }

Within the component I know I can add require(image_path) for a specific image at the top of the file before I create the component but I want make the component generic and have it take a property with the path for the image that is passed from the parent component.

What I have tried is:

<img src={require(this.props.img)} />

For the actual property I have tried pretty much every path I can think of to the image from the project root, from the react app root, and from the component itself.

Filesystem

|-- src
|   ` app.js
|   `--images
|      ` image.jpg
|      ` image.jpg
|   `-- components
|      `parent_component.js
|      `child_component.js

The parent component is basically just a container to hold multiples of the child so...

<ChildComponent img=data.img1 />
<ChildComponent img=data.img2 />
etc....

Is there any way in which to do this using react and webpack with url-loader or am I just going down a wrong path to approach this?

回答1:

Using url-loader, described here (SurviveJS - Loading Images), you can then use in your code :

import LogoImg from 'YOUR_PATH/logo.png';

and

<img src={LogoImg}/>

Edit: a precision, images are inlined in the js archive with this technique. It can be worthy for small images, but use the technique wisely.

回答2:

If you are bundling your code at the server-side, then there is nothing stopping you from requiring assets directly from jsx:

<div>
  <h1>Image</h1>
  <img src={require('./assets/image.png')} />
</div>

回答3:

UPDATE: this only tested with server side rendering ( universal Javascript ) here is my boilerplate.

With only file-loader you can load images dynamically - the trick is to use ES6 template strings so that Webpack can pick it up:

This will NOT work. :

const myImg = './cute.jpg'
<img src={require(myImg)} />

To fix this, just use template strings instead :

const myImg = './cute.jpg'
<img src={require(`${myImg}`)} />

webpack.config.js :

var HtmlWebpackPlugin =  require('html-webpack-plugin')
var ExtractTextWebpackPlugin = require('extract-text-webpack-plugin')

module.exports = {
  entry : './src/app.js',
  output : {
    path : './dist',
    filename : 'app.bundle.js'
  },
  plugins : [
  new ExtractTextWebpackPlugin('app.bundle.css')],
  module : {
    rules : [{
      test : /\.css$/,
      use : ExtractTextWebpackPlugin.extract({
        fallback : 'style-loader',
        use: 'css-loader'
      })
    },{
      test: /\.js$/,
      exclude: /(node_modules)/,
      loader: 'babel-loader',
      query: {
        presets: ['react','es2015']
      }
    },{
      test : /\.jpg$/,
      exclude: /(node_modules)/,
      loader : 'file-loader'
    }]
  }
}

回答4:

So you have to add an import statement on your parent component:

class ParentClass extends Component {
  render() {
    const img = require('../images/img.png');
    return (
      <div>
        <ChildClass
          img={img}
        />
      </div>
    );
  }
}

and in the child class:

class ChildClass extends Component {
  render() {
    return (
      <div>
          <img
            src={this.props.img}
          />
      </div>
    );
  }
}

回答5:

You do not embed the images in the bundle. They are called through the browser. So its;

var imgSrc = './image/image1.jpg';

return <img src={imgSrc} />

回答6:

If you are looking for a way to import all your images from the image

// Import all images in image folder
function importAll(r) {
    let images = {};
    r.keys().map((item, index) => { images[item.replace('./', '')] = r(item); });
    return images;
}

const images = importAll(require.context('../images', false, /\.(gif|jpe?g|svg)$/));

Then:

<img src={images['image-01.jpg']}/>

You can find the original thread here: Dynamically import images from a directory using webpack

回答7:

here is the code

    import React, { Component } from 'react';
    import logo from './logo.svg';
    import './image.css';
    import Dropdown from 'react-dropdown';
    import axios from 'axios';

    let obj = {};

    class App extends Component {
      constructor(){
        super();
        this.state = {
          selectedFiles: []
        }
        this.fileUploadHandler = this.fileUploadHandler.bind(this);
      }

      fileUploadHandler(file){
        let selectedFiles_ = this.state.selectedFiles;
        selectedFiles_.push(file);
        this.setState({selectedFiles: selectedFiles_});
      }

      render() {
        let Images = this.state.selectedFiles.map(image => {
          <div className = "image_parent">

              <img src={require(image.src)}
              />
          </div>
        });

        return (
            <div className="image-upload images_main">

            <input type="file" onClick={this.fileUploadHandler}/>
            {Images}

            </div>
        );
      }
    }

    export default App;

来源：https://stackoverflow.com/questions/32612912/dynamically-add-images-react-webpack