add: AntD图片上传组件的customRequest方法
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								12-React基础/10-AntD框架的upload组件上传图片时使用customRequest方法自定义上传行为.md
									
									
									
									
									
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								12-React基础/10-AntD框架的upload组件上传图片时使用customRequest方法自定义上传行为.md
									
									
									
									
									
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本次做后台管理系统,采用的是 AntD 框架。涉及到图片的上传,用的是AntD的 [upload](https://ant.design/components/upload-cn/) 组件。
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我在上一篇文章《[AntD框架的upload组件上传图片时使用customRequest方法自定义上传行为](https://www.cnblogs.com/qianguyihao/p/13093592.html)》中讲到:AntD 的 upload 组件有很多坑,引起了很多人的关注。折腾过的人,自然明白其中的苦楚。
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今天这篇文章,我们继续来研究 AntD 的 upload 组件的另一个坑。
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备注:本文写于2020-06-11,使用的 antd 版本是 3.13.6。
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## 使用 AntD 的 upload 组件做图片的上传,效果演示
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因为需要上传多张图片,所以采用的是照片墙的形式。上传成功后的界面如下:
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(1)上传中:
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(2)上传成功:
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(3)图片预览:
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## 代码实现
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首先,你需要让后台同学提供好图片上传的接口。上一篇文章中,我们是把接口调用直接写在了 `<Upload>` 标签的 action 属性当中。但如果你在调接口的时候,动作很复杂(比如根据业务要求,需要连续调两个接口才能上传图片,或者在调接口时还要做其他的事情),这个 action 方法就无法满足需求了。那该怎么做呢?
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好在 AntD 的 upload 组件给我们提供了 `customRequest`这个方法:
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关于customRequest 这个方法, AntD 官方并没有给出示例,他们只是在 GitHub 上给出了这样一个简短的介绍:
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但这个方法怎么用呢?用的时候,会遇到什么问题呢?AntD 官方没有说。我在网上搜了半天,也没看到比较完整的、切实可行的 Demo。我天朝地大物博,网络资料浩如烟海,AntD 可是口口声声被人们号称是天朝最好用的管理后台的样式框架。可如今,却面临这样的局面。我看着你们,满怀羡慕。
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既然如此,那我就自己研究吧。折腾了一天,总算是把 customRequest 的坑踩得差不多了。
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啥也不说了,直接上代码。
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采用 AntD框架的 [upload](https://ant.design/components/upload-cn/) 组件的 customRequest 方法,自定义上传行为。核心代码如下:
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```js
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import React, { PureComponent } from 'react';
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import { Button, Card, Form, message, Upload, Icon, Modal, Row, Col } from 'antd';
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import { connect } from 'dva';
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import { queryMyData, submitData } from '../api';
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import { uploadImage } from '../../utils/wq.img.upload';
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import styles from '../../utils/form.less';
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const FormItem = Form.Item;
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@Form.create()
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export default class PicturesWall extends PureComponent {
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  constructor(props) {
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    super(props);
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    const { id } = this.props.match.params;
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    this.state = {
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      id,
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      img: undefined, // 从接口拿到的图片字段
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      imgList: [], // 展示在 antd图片组件上的数据
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      previewVisible: false,
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      previewImage: '',
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    };
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  }
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  componentDidMount() {
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    const { id } = this.state;
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    id && this.queryData();
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  }
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  // 调接口,查询已有的数据
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  queryData() {
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    const { id } = this.state;
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    queryMyData({
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      id,
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    })
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      .then(({ ret, data }) => {
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        if (ret == 0 && data && data.list && data.list.length) {
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          const item = data.list[0];
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          const img = data.img;
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          const imgList = item.img
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            ? [
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              {
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                uid: '1', // 注意,这个uid一定不能少,否则展示失败
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                name: 'hehe.png',
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                status: 'done',
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                url: img,
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              },
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            ]
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            : [];
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          this.setState({
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            img,
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            imgList,
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          });
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        } else {
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          return Promise.reject();
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        }
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      })
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      .catch(() => {
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        message.error('查询出错,请重试');
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      });
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  }
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  handleCancel = () => this.setState({ previewVisible: false });
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  // 方法:图片预览
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  handlePreview = (file) => {
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    console.log('smyhvae handlePreview:' + JSON.stringify(file));
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    this.setState({
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      previewImage: file.url || file.thumbUrl,
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      previewVisible: true,
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    });
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  };
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  // 参考链接:https://www.jianshu.com/p/f356f050b3c9
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  handleBeforeUpload = (file) => {
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    console.log('smyhvae handleBeforeUpload file:' + JSON.stringify(file));
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    console.log('smyhvae handleBeforeUpload file.file:' + JSON.stringify(file.file));
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    console.log('smyhvae handleBeforeUpload file type:' + JSON.stringify(file.type));
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    //限制图片 格式、size、分辨率
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    const isJPG = file.type === 'image/jpeg';
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    const isJPEG = file.type === 'image/jpeg';
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    const isGIF = file.type === 'image/gif';
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    const isPNG = file.type === 'image/png';
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    const isLt2M = file.size / 1024 / 1024 < 1;
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    if (!(isJPG || isJPEG || isPNG)) {
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      Modal.error({
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        title: '只能上传JPG、JPEG、PNG格式的图片~',
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      });
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    } else if (!isLt2M) {
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      Modal.error({
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        title: '图片超过1M限制,不允许上传~',
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      });
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    }
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    return (isJPG || isJPEG || isPNG) && isLt2M;
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  };
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  // checkImageWH  返回一个promise  检测通过返回resolve  失败返回reject阻止图片上传
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  checkImageWH(file) {
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    return new Promise(function (resolve, reject) {
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      let filereader = new FileReader();
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      filereader.onload = (e) => {
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        let src = e.target.result;
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        const image = new Image();
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        image.onload = function () {
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          // 获取图片的宽高
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          file.width = this.width;
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          file.height = this.height;
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          resolve();
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        };
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        image.onerror = reject;
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        image.src = src;
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      };
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      filereader.readAsDataURL(file);
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    });
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  }
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  // 图片上传
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  doImgUpload = (options) => {
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    const { onSuccess, onError, file, onProgress } = options;
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    // start:进度条相关
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    // 伪装成 handleChange里面的图片上传状态
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    const imgItem = {
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      uid: '1', // 注意,这个uid一定不能少,否则上传失败
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      name: 'hehe.png',
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      status: 'uploading',
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      url: '',
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      percent: 99, // 注意不要写100。100表示上传完成
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    };
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    this.setState({
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      imgList: [imgItem],
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    }); // 更新 imgList
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    // end:进度条相关
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    const reader = new FileReader();
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    reader.readAsDataURL(file); // 读取图片文件
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    reader.onload = (file) => {
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      const params = {
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        myBase64: file.target.result, // 把 本地图片的base64编码传给后台,调接口,生成图片的url
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      };
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      // 上传图片的base64编码,调接口后,返回 imageId
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      uploadImage(params)
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        .then((res) => {
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          console.log('smyhvae doImgUpload:' + JSON.stringify(res));
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          console.log('smyhvae 图片上传成功:' + res.imageUrl);
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          const imgItem = {
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            uid: '1', // 注意,这个uid一定不能少,否则上传失败
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            name: 'hehe.png',
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            status: 'done',
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            url: res.imageUrl, // url 是展示在页面上的绝对链接
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            imgUrl: res.imageUrl, // imgUrl 是存到 db 里的相对链接
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            // response: '{"status": "success"}',
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          };
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          this.setState({
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            imgList: [imgItem],
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          }); // 更新 imgList
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        })
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        .catch((e) => {
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          console.log('smyhvae 图片上传失败:' + JSON.stringify(e || ''));
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          message.error('图片上传失败,请重试');
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        });
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    };
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  };
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  handleChange = ({ file, fileList }) => {
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    console.log('smyhvae handleChange file:' + JSON.stringify(file));
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    console.log('smyhvae handleChange fileList:' + JSON.stringify(fileList));
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    if (file.status == 'removed') {
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      this.setState({
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        imgList: [],
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      });
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    }
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  };
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  submit = (e) => {
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    e.preventDefault();
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    this.props.form.validateFields((err, fieldsValue) => {
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      if (err) {
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        return;
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      }
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      const { id, imgList } = this.state;
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      const tempImgList = imgList.filter((item) => item.status == 'done'); // 筛选出 status = done 的图片
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      const imgArr = [];
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      tempImgList.forEach((item) => {
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        imgArr.push(item.imgUrl);
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        // imgArr.push(item.url);
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      });
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      submitData({
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        id,
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        img: imgArr[0] || '', // 1、暂时只传一张图片给后台。如果传多张图片,那么,upload组件需要进一步完善,比较麻烦,以后有需求再优化。2、如果图片字段是选填,那就用空字符串兜底
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      })
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        .then((res) => {
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          if (res.ret == 0) {
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            message.success(`${id ? '修改' : '新增'}成功,自动跳转中...`);
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          } else if (res.ret == 201 || res.ret == 202 || res.ret == 203 || res.ret == 6) {
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            return Promise.reject(res.msg);
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          } else {
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            return Promise.reject();
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          }
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        })
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        .catch((e) => {
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          message.error(e || '提交失败,请重试');
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        });
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    });
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  };
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  render() {
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    const { id, imgList } = this.state;
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    console.log('smyhvae render imgList:' + JSON.stringify(imgList));
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    const { getFieldDecorator } = this.props.form;
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    const formItemLayout = {
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      labelCol: { span: 3 },
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      wrapperCol: { span: 10 },
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    };
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    const buttonItemLayout = {
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      wrapperCol: { span: 10, offset: 3 },
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    };
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    const uploadButton = (
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      <div>
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        <Icon type="plus" />
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        <div className="ant-upload-text">Upload</div>
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      </div>
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    );
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    return (
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      <Card title={id ? '修改信息' : '新增信息'}>
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        <Form onSubmit={this.submit} layout="horizontal">
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          {/* 新建图片、编辑图片 */}
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          <FormItem label="图片" {...formItemLayout}>
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            {getFieldDecorator('img', {
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              rules: [{ required: false, message: '请上传图片' }],
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            })(
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              <Upload
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                action="2"
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                customRequest={this.doImgUpload}
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                listType="picture-card"
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                fileList={imgList}
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                onPreview={this.handlePreview}
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                beforeUpload={this.handleBeforeUpload}
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                onChange={this.handleChange}
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              >
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                {imgList.length >= 1 ? null : uploadButton}
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              </Upload>
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            )}
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          </FormItem>
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          <Row>
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            <Col span={3} />
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            <Col span={18} className={styles.graytext}>
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              注:图片支持JPG、JPEG、PNG格式,小于1M,最多上传1张
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            </Col>
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          </Row>
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          <FormItem {...buttonItemLayout}>
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            <Button type="primary" htmlType="submit">
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              提交
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            </Button>
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          </FormItem>
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        </Form>
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        {/* 图片点开预览 */}
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        <Modal visible={this.state.previewVisible} footer={null} onCancel={this.handleCancel}>
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          <img alt="example" style={{ width: '100%' }} src={this.state.previewImage} />
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        </Modal>
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      </Card>
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    );
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  }
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}
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```
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## 参考链接
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注意file的格式:https://www.lmonkey.com/t/oREQA5XE1
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Demo在线演示:
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- <https://stackoverflow.com/questions/58128062/using-customrequest-in-ant-design-file-upload>
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- <https://stackblitz.com/edit/so-58128062-upload-progress>
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fileList 格式在线演示:
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- <https://stackoverflow.com/questions/51514757/action-function-is-required-with-antd-upload-control-but-i-dont-need-it>
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- <https://codesandbox.io/s/rl7ooo544q>
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ant design Upload组件的使用总结:https://www.jianshu.com/p/0aa4612af987
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antd上传功能的CustomRequest:<https://mlog.club/article/3832743>
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