在React中使用Color Thief库不起作用

时间:2019-05-17 07:28:20

标签: javascript reactjs color-thief

我正在努力在React应用程序中添加Color Thief。我已经按照github上的说明进行了操作,但是没有任何变化。 我已经应用了建议报告者here,然后将脚本插入到setTimeout函数中,但是总是收到相同的错误:

error

您能帮助我在响应中运行该库(如果有替代方案,请运行类似的库)?

到目前为止,这是我的代码:

import React from 'react';
import './App.css';
var ColorThief = require('color-thief');

function App() {
 setTimeout(function(){
    var colorThief = new ColorThief();
    var img = 'img.jpg';
    var palette = colorThief.getPalette(img, 8);
    var dominant =  colorThief.getColor(img);
    console.log(palette);
    console.log(dominant);
    document.getElementById("app").style.backgroundColor = "rgb(" + dominant + ")";
 }, 3000);

return (
    <div id="app"></div>
 );
}

export default App;

2 个答案:

答案 0 :(得分:0)

使用npm安装库:

$ npm i --save colorthief

将库导入文件中为:

import ColorThief from "colorthief";

为图像创建反应引用,如下所示:

  constructor(props) {
    super(props);

    // Image element reference
    this.imgRef = React.createRef();
  }

图像组件应如下所示:

          <img
            crossOrigin={"anonymous"}
            ref={this.imgRef}
            src={
              "https://images.unsplash.com/photo-1516876437184-593fda40c7ce"
            }
            alt={"example"}
            className={"example__img"}
            onLoad={() => {
              const colorThief = new ColorThief();
              const img = this.imgRef.current;
              const result = colorThief.getColor(img, 25);
            }}
          />

请注意,图片道具应与此完全相同)

答案 1 :(得分:0)

import ColorThief from "colorthief";
import _ from 'lodash';

export const getPalette = (url) => {
    return new Promise((resolve, reject) => {
        if (!url) {
            reject();
        }
        const image = new Image();
        image.src = url;
        image.crossOrigin = 'Anonymous';

        image.onload = function () {
            const colorThief = new ColorThief();
            const palette = colorThief.getPalette(this, 10);
            const result = _.uniq(palette, item => JSON.stringify(item));
            resolve(result);
        }
    });
}