Vue series article directory
需求：后端返回文件流前端将文件流转为成blob地址预览pdf文件
提示：以下是本篇文章正文内容，下面案例可供参考
1. Install PDF plug-in dependencies
npm install vue-pdf --save
2. Encapsulate the vuePdf component as a preview page, and jump to the preview page through the Management.vue routing parameter transfer form
1.Management.view
The code is as follows (example):
- Encapsulated request pdfDocument
一定要加上
{
responseType: "blob",
}
The pdf file stream returned in the background is result.data
with code:
// 预览
async scanSubmit(row) {
// 这个代码我不多做解释，接口请求而已
const result = await pdfDocument(this.fileId);
// 直接使用createObjectURL可能会出现问题
// 所以我建议使用下面这种方式将文件流转化为本地blod地址
var binaryData = [];
binaryData.push(result.data);
console.log(binaryData);
// 记得一定要设置application的类型
let url = window.URL.createObjectURL(
new Blob(binaryData, {
type: "application/pdf;charset=utf-8",
})
);
if (url != null && url != undefined && url) {
// vue路由跳转并以问号形式携带vue-pdf预览时所需要的pdf地址
const {
href } = this.$router.resolve({
path: "/vuePdf",
query: {
//要传的参数
url: url,
},
});
// 新页面打开
window.open(href, "_blank");
this.openTheScanningdialog = false;
}
},
2.vuedf.vue
HTML part, no need to modify, copy can be used directly
<template>
<div id="container">
<!-- 上一页、下一页 -->
<div class="right-btn">
<!-- 输入页码 -->
<div class="pageNum">
<input
v-model.number="currentPage"
type="number"
class="inputNumber"
@input="inputEvent()"
/>
/ {
{
pageCount }}
</div>
<div @click="changePdfPage('first')" class="turn">首页</div>
<!-- 在按钮不符合条件时禁用 -->
<div
@click="changePdfPage('pre')"
class="turn-btn"
:style="currentPage === 1 ? 'cursor: not-allowed;' : ''"
>
上一页
</div>
<div
@click="changePdfPage('next')"
class="turn-btn"
:style="currentPage === pageCount ? 'cursor: not-allowed;' : ''"
>
下一页
</div>
<div @click="changePdfPage('last')" class="turn">尾页</div>
</div>
<div class="pdfArea">
<!-- // 不要改动这里的方法和属性,下次用到复制就直接可以用 -->
<pdf
:src="src"
ref="pdf"
v-show="loadedRatio === 1"
:page="currentPage"
@num-pages="pageCount = $event"
@progress="loadedRatio = $event"
@page-loaded="currentPage = $event"
@loaded="loadPdfHandler"
@link-clicked="currentPage = $event"
style="display: inline-block; width: 100%"
id="pdfID"
></pdf>
</div>
<!-- 加载未完成时，展示进度条组件并计算进度 -->
<div class="progress" v-if="loadedRatio != 1">
<el-progress
type="circle"
:width="70"
color="#53a7ff"
:percentage="
Math.floor(loadedRatio * 100) ? Math.floor(loadedRatio * 100) : 0
"
></el-progress>
<br />
<!-- 加载提示语 -->
<span>{
{
remindShow }}</span>
</div>
</div>
</template>
JS part, no need to modify, copy can be used directly
<script>
import pdf from "vue-pdf";
export default {
components: {
pdf,
},
data() {
return {
// ----- loading -----
remindText: {
loading: "加载文件中，文件较大请耐心等待...",
refresh: "若卡住不动，可刷新页面重新加载...",
},
remindShow: "加载文件中，文件较大请耐心等待...",
intervalID: "",
// ----- vuepdf -----
// src静态路径: /static/xxx.pdf
// src服务器路径: 'http://.../xxx.pdf'
src: "",
// 当前页数
currentPage: 0,
// 总页数
pageCount: 0,
// 加载进度
loadedRatio: 0,
};
},
created() {
// 页面加载，拿到路由中的url复制给data中的src
this.src = this.$route.query.url;
console.log(this.src);
},
mounted() {
// // 更改 loading 文字
this.intervalID = setInterval(() => {
this.remindShow === this.remindText.refresh
? (this.remindShow = this.remindText.loading)
: (this.remindShow = this.remindText.refresh);
}, 4000);
},
methods: {
// 页面回到顶部
toTop() {
document.getElementById("container").scrollTop = 0;
},
// 输入页码时校验
inputEvent() {
if (this.currentPage > this.pageCount) {
// 1. 大于max
this.currentPage = this.pageCount;
} else if (this.currentPage < 1) {
// 2. 小于min
this.currentPage = 1;
}
},
// 切换页数
changePdfPage(val) {
if (val === "pre" && this.currentPage > 1) {
// 切换后页面回到顶部
this.currentPage--;
this.toTop();
} else if (val === "next" && this.currentPage < this.pageCount) {
this.currentPage++;
this.toTop();
} else if (val === "first") {
this.currentPage = 1;
this.toTop();
} else if (val === "last" && this.currentPage < this.pageCount) {
this.currentPage = this.pageCount;
this.toTop();
}
},
// pdf加载时
loadPdfHandler(e) {
// 加载的时候先加载第一页
this.currentPage = 1;
},
},
destroyed() {
// 在页面销毁时记得清空 setInterval
clearInterval(this.intervalID);
},
};
</script>
The CSS part can be modified according to your own needs
<style scoped>
#container {
position: absolute !important;
left: 0;
right: 0;
bottom: 0;
top: 0;
background: #f4f7fd;
overflow: auto;
font-family: PingFang SC;
width: 100%;
display: flex;
/* justify-content: center; */
position: relative;
}
/* 右侧功能按钮区 */
.right-btn {
position: fixed;
right: 5%;
bottom: 15%;
width: 120px;
display: flex;
flex-wrap: wrap;
justify-content: center;
z-index: 99;
}
.pdfArea {
width: 900px;
margin: 0 auto;
}
/* ------------------- 输入页码 ------------------- */
.pageNum {
margin: 10px 0;
font-size: 18px;
}
/*在谷歌下移除input[number]的上下箭头*/
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
-webkit-appearance: none !important;
margin: 0;
}
/*在firefox下移除input[number]的上下箭头*/
input[type="number"] {
-moz-appearance: textfield;
}
.inputNumber {
border-radius: 8px;
border: 1px solid #999999;
height: 35px;
font-size: 18px;
width: 60px;
text-align: center;
}
.inputNumber:focus {
border: 1px solid #00aeff;
background-color: rgba(18, 163, 230, 0.096);
outline: none;
transition: 0.2s;
}
/* ------------------- 切换页码 ------------------- */
.turn {
background-color: #164fcc;
opacity: 0.9;
color: #ffffff;
height: 70px;
width: 70px;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
margin: 5px 0;
}
.turn-btn {
background-color: #164fcc;
opacity: 0.9;
color: #ffffff;
height: 70px;
width: 70px;
border-radius: 50%;
margin: 5px 0;
display: flex;
align-items: center;
justify-content: center;
}
.turn-btn:hover,
.turn:hover {
transition: 0.3s;
opacity: 0.5;
cursor: pointer;
}
/* ------------------- 进度条 ------------------- */
.progress {
position: absolute;
right: 50%;
top: 50%;
text-align: center;
}
.progress > span {
color: #199edb;
font-size: 14px;
}
</style>
renderings
**
Realize download/open online
**
①Install downloadjs
npm install downloadjs
②Introduce where needed
import download from 'downloadjs'
③Download can be realized by calling download in the download method
The name of the file stream data save file type to download