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vue3+vant4實(shí)現(xiàn)pdf文件上傳與預(yù)覽組件

更新時(shí)間：2025年04月08日 09:30:49 作者：肖肖肖麗珠

這篇文章主要介紹了vue3如何結(jié)合vant4實(shí)現(xiàn)簡(jiǎn)單的pdf文件上傳與預(yù)覽組件,文中的示例代碼講解詳細(xì),感興趣的小伙伴可以跟隨小編一起學(xué)習(xí)一下

注意下載的插件的版本"pdfjs-dist": "^2.2.228",

npm i  pdfjs-dist@2.2.228

然后封裝一個(gè)pdf的遮罩。因?yàn)閜df文件有多頁(yè)，所以我用了swiper輪播的形式展示。因?yàn)橛玫揭苿?dòng)端，手動(dòng)滑動(dòng)頁(yè)面這樣比點(diǎn)下一頁(yè)下一頁(yè)的方便多了。

直接貼代碼了

PdfPreview/index.vue

<!--預(yù)覽pdf文件的組件-->
<template>
  <van-overlay :show="show" @click="close()">
    <div class="pdf-viewer" >
      <van-swipe class="my-swipe" indicator-color="red" @click.stop>
        <van-swipe-item v-for="item in pageNum" :key="item">
          <canvas :id="`pdf-canvas-${item}`" class="pdf-page"/>
        </van-swipe-item>
        <template #indicator="{ active, total }">
          <div class="custom-indicator">{{ active + 1 }}/{{ total }}</div>
        </template>
      </van-swipe>
      <van-empty
          v-if="loadError"
          image="error"
          description="PDF加載出錯(cuò)了..."
      />
    </div>
    <van-icon name="close" color="#fff" size="0.3rem"/>
  </van-overlay>

</template>

<script setup lang="tsx">
import {ref, nextTick, watch} from 'vue';
import {closeToast, showLoadingToast, showSuccessToast} from "vant";

// 引入pdf預(yù)覽插件相關(guān)的參數(shù)，注意這塊開(kāi)始試了很多網(wǎng)上方法都不好用
import * as pdfjs from 'pdfjs-dist';
import pdfjsWorker from 'pdfjs-dist/build/pdf.worker?url';
// 設(shè)置 worker 路徑
pdfjs.GlobalWorkerOptions.workerSrc = pdfjsWorker;


const show = ref(true);
// html部分涉及的參數(shù)
const loadError = ref(false);
const detail = ref({});
let pdfDoc = null; // 一定不能使用響應(yīng)式的數(shù)據(jù)，會(huì)報(bào)錯(cuò)Cannot read from private field---pdf.js
const pageNum = ref(0);


const props = defineProps({
  pdfUrl: {
    type: String,
    default: ""
  },
})
const emit= defineEmits(['close'])

watch(() => props.pdfUrl, (newVal) => {
  // console.log("監(jiān)聽(tīng)", newVal, props.pdfUrl)
  showLoadingToast('加載中');
  nextTick(() => {
    loadingPdf(props.pdfUrl);
  })

}, {immediate: true,deep:true})
// 防抖 debounce 函數(shù)的實(shí)現(xiàn)正確。
const debounce(func, wait, options = {}) {
    let timeout;
    const { leading = false, trailing = true } = options;

    return function(...args) {
        const later = () => {
            timeout = null;
            if (!leading) func.apply(this, args);
        };

        const callNow = leading && !timeout;
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);

        if (callNow) func.apply(this, args);
    };
}
// 使用防抖函數(shù)，300ms內(nèi)只執(zhí)行一次，避免多次點(diǎn)擊立刻打開(kāi)又關(guān)閉的情況
const close = debounce(() => {
  show.value = false;
  emit('close')
}, 300, { leading: true, trailing: false });

//加載pdf
const loadingPdf = (url) => {
  const afterUrl = {
    url,
    httpHeaders: {
      token: `Bearer-${localStorage.getItem('token')}`,//微信小程序里面打開(kāi)這個(gè)模塊，發(fā)現(xiàn)請(qǐng)求401，報(bào)錯(cuò)信息是登陸訪問(wèn)超時(shí)，發(fā)現(xiàn)pdfjs加載pdf時(shí)沒(méi)有攜帶token,于是在加載url時(shí)添加token即可
    },
  };
  const loadingTask = pdfjs.getDocument(afterUrl);
  loadingTask.promise
      .then((pdf) => {
        pdfDoc = pdf;
        pageNum.value = pdf.numPages;
        nextTick(() => {
          renderPage();
        });
      })
      .catch(() => {
        loadError.value = true;
      });
}

// 渲染pdf
const renderPage = (num = 1) => {
  pdfDoc.getPage(num).then((page) => {
    const canvas = document.getElementById(`pdf-canvas-${num}`);
    if(!canvas){return}
    const ctx = canvas.getContext('2d');
    const scale = 1.5;
    const viewport = page.getViewport({scale});
    // 畫(huà)布大小,默認(rèn)值是width:300px,height:150px
    canvas.height = viewport.height;
    canvas.width = viewport.width;
    // 畫(huà)布的dom大小, 設(shè)置移動(dòng)端,寬度設(shè)置鋪滿整個(gè)屏幕
    const {clientWidth} = document.body;
    // 減去2rem使用因?yàn)槲业捻?yè)面左右加了padding
    canvas.style.width = `calc(${clientWidth}px - 2rem)`;
    // 根據(jù)pdf每頁(yè)的寬高比例設(shè)置canvas的高度
    canvas.style.height = `${
        clientWidth * (viewport.height / viewport.width)
    }px`;
    canvas.height = viewport.height;
    canvas.width = viewport.width;
    page.render({
      canvasContext: ctx,
      viewport,
    });
    //隱藏渲染所有的頁(yè)面
    if (num < pageNum.value) {
      renderPage(num + 1);
    } else {
      closeToast();
    }
  });
}

</script>

<style scoped>
.pdf-viewer{
  display: flex;
  justify-content: center;
  align-items: center;
  height:100vh;
  width:100vw;
  text-align: center;
}
.custom-indicator {
  position: absolute;
  left: 50%;
  bottom: 15px;
  transform: translateX(-50%);
  padding: 2px 5px;
  font-size: 18px;
  color: #fff;
  background: rgba(0, 0, 0, 0.1);
}
</style>

上傳的頁(yè)面可以參考文末補(bǔ)充內(nèi)容，稍微改動(dòng)一下就可以了。

然后給組件添加一個(gè)點(diǎn)擊預(yù)覽的事件。并把上面寫(xiě)好的預(yù)覽組件引入

import PdfPreview from "@/components/PdfPreview/index.vue";
// 點(diǎn)擊預(yù)覽文件
const showPreview=(file)=>{
  if(file.absoluteUrl.endsWith('.pdf')){
    pdfUrl.value=file.absoluteUrl;
    preview.value=true;
  }
}

遇到的問(wèn)題：

如果報(bào)錯(cuò)

Uncaught (in promise) TypeError: Cannot read properties of null (reading 'getContext')

可能是canvas要找的那個(gè)id在頁(yè)面還沒(méi)有渲染出來(lái)。所以我用的nextTick，還在獲取canvas后面判斷了一下找到了再繼續(xù) ，注意上面棕色加粗的地方。

如果報(bào)錯(cuò)

vue-router.mjs:3518SyntaxError: The requested module '/node_modules/.vite/deps/pdfjs-dist_build_pdf__worker__entry.js?v=8ae4d11f' does not provide an export named 'default'

檢查一下你引入插件的地方。如果是

import pdfjsWorker from 'pdfjs-dist/build/pdf.worker.entry';

這樣寫(xiě)的就是錯(cuò)的，改成

import pdfjsWorker from 'pdfjs-dist/build/pdf.worker?url';

問(wèn)題：如果你點(diǎn)擊第一次彈窗展示了，但是再點(diǎn)擊就沒(méi)有彈出。

原因是預(yù)覽的組件渲染是監(jiān)聽(tīng)的pdf的url的地址。如果你第一個(gè)打開(kāi)沒(méi)有把組件銷毀。那么再次顯示的時(shí)候沒(méi)有走監(jiān)聽(tīng)。就不會(huì)顯示。所以要在每次關(guān)閉彈窗是組件也銷毀。這就是上面我要在子組件中用@close給組件通知讓他不顯示也就是銷毀子組件的原因。

問(wèn)題：無(wú)意間雙擊了文件導(dǎo)致遮罩馬上顯示又隱藏。頁(yè)面效果就是黑色遮罩閃了一下。

可以使用防抖的方式。延遲關(guān)閉。參考上面紫色的關(guān)閉函數(shù)

知識(shí)補(bǔ)充

vant4+vue3封裝一個(gè)上傳公共組件.有上傳和刪除訪問(wèn)接口的過(guò)程。限制上傳的格式和上傳文件大小

效果圖

我的上傳接口需要參數(shù)和返回的參數(shù)

<template>
  <div class="upload-box1">
   
    <van-uploader
        v-model="_fileList"
        list-type="picture-card"
        :class="['upload', self_disabled ? 'disabled' : '']"
        :multiple="false"
        :disabled="self_disabled"
        :max-count="props.limit"
        :after-read="handleHttpUpload"
        :before-read="beforeUpload"
        :before-delete="handleRemove"
        :accept="props.fileType"
        :deletable="props.deletable"
        upload-icon="plus"
        :max-size="500 * 1024* 1000"
        :preview-image="true"
        :preview-size="props.width"
        :reupload="props.reupload"
        @oversize="onOversize"
    >
    </van-uploader>
//我的展示效果里面有個(gè)文字。所以在下面加了這個(gè).
    <div v-for="item in _fileList" :key="item.url" v-if="_fileList.length>0" >
      <div name="tips" class="tips" style="width:70px">{{props.tips}}</div>
    </div>

    <div class="tips" :style="{'width':props.width}" v-else>
      <div name="tips">{{props.tips}}</div>
    </div>

  </div>
</template>

<script setup lang="tsx" name="UploadImgs">
import { ref, computed, inject, watch } from "vue";
import { removeImg, uploadFile } from "@/api/modules/upload";//封裝的接口

import {showFailToast,showSuccessToast } from 'vant';
import type { UploaderFileListItem, ImagePreviewOptions } from 'vant';

//上傳的內(nèi)容參數(shù)
interface UploaderFileList {
  url:string,
  name:string,
  absoluteUrl:string,
  businessCode:string,
  businessSubCode:string,
  businessId:string,
  resourceId:string,
}
interface UploadFileProps {
  fileList: UploaderFileList[];
  disabled?: boolean; // 是否禁用上傳組件 ==> 非必傳（默認(rèn)為 false）
  limit?: number; // 最大圖片上傳數(shù) ==> 非必傳（默認(rèn)為 5張）
  nowLimit?:number;//當(dāng)前頁(yè)面只有一個(gè)圖片的地方。圖片上傳的數(shù)量限制
  fileSize?: number; // 圖片大小限制 ==> 非必傳（默認(rèn)為 5M）
  fileType?:string; // 類型限制 ==> 非必傳（默認(rèn)為 "image/jpeg", "image/png", "image/gif","application/pdf"）
  height?: string; // 組件高度 ==> 非必傳（默認(rèn)為 60px）
  width?: string; // 組件寬度 ==> 非必傳（默認(rèn)為 60px）
  borderRadius?: string; // 組件邊框圓角 ==> 非必傳（默認(rèn)為 8px）
  uploadParams?: any; //上傳帶的參數(shù)==>必填
  tips?:string;
  deletable?:boolean;
  reupload?:boolean;//是否可重復(fù)上傳==>非必填默認(rèn)false。不可重復(fù)上傳。點(diǎn)擊圖片是預(yù)覽效果
}

const props = withDefaults(defineProps<UploadFileProps>(), {
  fileList:()=> [],
  disabled: false,
  limit: 5,
  nowLimit:1,
  fileSize: 5,
  fileType: "image/jpeg, image/png, image/gif, application/pdf",
  height: "60px",
  width: "60px",
  borderRadius: "8px",
  uploadParams: {},
  tips:"上傳",
  deletable:true,
  reupload:false
});
const emit = defineEmits(["update:fileList", "update"]);


// 判斷是否禁用上傳和刪除
const self_disabled = computed(() => {
  return props.disabled
});

const _fileList =  ref<UploaderFileList[]>(props.fileList)
const uploadFileData = ref(); //上傳的文件

// 監(jiān)聽(tīng) props.fileList 列表默認(rèn)值改變
watch(
    () => props.fileList,
    (n) => {
      _fileList.value = n.map(res=>{
        return {
          url:res.absoluteUrl||'',//展示的時(shí)候需要url但是接口給我回傳的里面沒(méi)有。所以這里自己拼接一下
          name:res.name||'',
          absoluteUrl:res.absoluteUrl||'',
          businessCode:res.businessCode||'',
          businessSubCode:res.businessSubCode||'',
          businessId:res.businessId||'',
          resourceId:res.resourceId||'',
        }
      });
    }
);

/**
 * @description 文件上傳之前判斷
 * @param rawFile 選擇的文件
 * */
const beforeUpload= (rawFile) => {
  console.log(rawFile)
  const imgSize = rawFile.size / 1024 / 1024 < props.fileSize;
  const imgType = props.fileType.includes(rawFile.type);
  if (!imgType)
    showFailToast( "上傳文件不符合所需的格式！");
  if (!imgSize)
    setTimeout(() => {
      showFailToast( `上傳文件大小不能超過(guò) ${props.fileSize}M！`);
    }, 0);
  return imgType && imgSize;
};


const onOversize=()=>{
  showFailToast( `上傳文件大小不能超過(guò) ${props.fileSize}M！`);
}
/**
 * @description 圖片上傳,請(qǐng)求接口
 * @param options upload 所有配置項(xiàng)
 * */
const handleHttpUpload = async (options: any) => {
  // console.log("handleHttpUpload", options.file)
//二進(jìn)制內(nèi)容上傳參數(shù)
  let formData = new FormData();
  formData.append("uploadFile", options.file);
  for (let key in props.uploadParams) {
    formData.append(key, props.uploadParams[key]);
  }

  try {
    const api = uploadFile;//上傳接口全局一樣，可以直接寫(xiě)死
    const { data,code } = await api(formData);
    if(code==200){
     //把接口返回的值給到操作的這個(gè)file，相當(dāng)于更新了_fileList.value
      options.businessCode = data.businessCode;
      options.businessSubCode = data.businessSubCode;
      options.resourceId = data.resourceId;
      options.businessId = data.businessId;
      options.absoluteUrl = data.absoluteUrl;
      options.url = data.absoluteUrl;

      emit("update", { data: data });
      showSuccessToast( "上傳成功！");
      console.log("上傳成功fileList：",_fileList.value)
      emit("update:fileList",_fileList.value);
    }else{
      uploadError();
    }
  } catch (error) {
    console.log(error as any);
  }
};



/**
 * @description 刪除圖片
 * @param file 刪除的文件
 * */
// 提取過(guò)濾邏輯為獨(dú)立函數(shù)，增強(qiáng)可讀性和復(fù)用性
function shouldRemoveItem(item, file) {
  // 檢查每個(gè)屬性是否完全匹配，避免邏輯錯(cuò)誤
  return (
      item.url === file.url &&
      item.name === file.name &&
      item.absoluteUrl === file.absoluteUrl
  );
}
const handleRemove = async (file: UploaderFileListItem, detail: { index: number }) => {
  // console.log("刪除",file,detail)
  // 應(yīng)用過(guò)濾邏輯，過(guò)濾掉已經(jīng)刪除的內(nèi)容
  _fileList.value = _fileList.value.filter((item) => !shouldRemoveItem(item, file));
  console.log("刪除",_fileList.value)
  let deleteParam = {
    sysCode: "aged",
    businessCode: file.businessCode,
    businessSubCode: file.businessSubCode,
    businessId: file.businessId,
    resourceIds: [file.resourceId],
  };

 let [code]= await removeImg(deleteParam);
 if(code==200){
   showSuccessToast( "刪除成功！");
 }
  emit("update:fileList", _fileList.value);
};

/**
 * @description 圖片上傳錯(cuò)誤
 * */
const uploadError = () => {
  showFailToast( "上傳失敗，請(qǐng)您重新上傳！");
};

/**
 * @description 文件數(shù)超出
 * */
const handleExceed = () => {
  showFailToast("當(dāng)前最多只能上傳"+(props.nowLimit||8)+"份，請(qǐng)移除后上傳！");
};


</script>

<style scoped lang="scss">
</style>

使用方法

<template>
  <Upload :upload-params="serviceOtherParams" v-model:file-list="img3" :limit="6" tips="上傳內(nèi)容">
  </Upload>
</template>

???????<script lang="ts" setup>
import Upload from "@/components/Upload/index.vue";
const img3=ref([])
//定義要傳遞的參數(shù)
const serviceOtherParams = reactive({
  sysCode: "aged",
  businessCode: "serviceOrderRecord",
  businessSubCode: "serviceOther",
});
</script>

img3就是最后上傳的內(nèi)容。不需要再寫(xiě)函數(shù)接收上傳的返回值了。

到此這篇關(guān)于vue3+vant4實(shí)現(xiàn)pdf文件上傳與預(yù)覽組件的文章就介紹到這了,更多相關(guān)vue3 vant4 pdf文件上傳與預(yù)覽內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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