如何用vue-pdf包实现pdf文件预览,支持分页_Vue.js

vue项目实现pdf文件预览功能

下载vue-pdf包

npm install --save vue-pdf

template模板内容：

//pdf组件
<pdf :src="pdffile" 
	:page="currentpage" 
	@num-pages="pagecount=$event" 
	@page-loaded="currentpage=$event" 
	@loaded="loadpdf">
</pdf>

//分页
<div class="pagebutton">
      <el-button size="mini" @click="changepage(0)" round>上一页</el-button>
      <span> {{currentpage}} / {{pagecount}} </span>
      <el-button size="mini" @click="changepage(1)" round>下一页</el-button>
</div>

引入组件，定义变量

//vue文件内导入并引用
import pdf from "vue-pdf";
export default {
	components: {
	    pdf,
	 },
	
	//定义变量
	data(){
		return {
			pdffile: "", //pdf文件地址
	      	currentpage: 0, // 页码
	      	pagecount: 0, // 总页数
		}
	},
	methods:{
		// 翻页
	    changepage (val) {
	      	if (val === 0 && this.currentpage > 1) {
	        	this.currentpage --;
	      	}
	      	if (val === 1 && this.currentpage < this.pagecount) {
	        	this.currentpage ++;
	      	}
	    },
      	// pdf加载时
	    loadpdf () {
	      	this.currentpage = 1 // 加载的时候先加载第一页
	    },
	}
}

vue-pdf实现pdf在线预览

1、首先安装vue-pdf ，在命令行中输入如下代码：

npm install --save vue-pdf

2、页面引用，新建index.vue

<template>
    <div class="ins-submit-docs-content ins-submit-docs-pdf">
        <div v-if="loading" style="position: absolute; top: 40%; width: 100%;text-align: center;">
            <van-loading type="spinner" color="#fc8955" />
        </div>
        <van-empty description="文档加载失败" v-if="loadingerror" />
            <pdf ref="morepdf" :src="src"></pdf>
    </div>
</template>

<script>
import vue from 'vue';
import pdf from 'vue-pdf'
import { loading } from 'vant';
vue.use(loading);
 
export default {
    name : 'ins-docs-pdf',
    props : {
        src : {
            type : string,    //默认值，选中值
            default : ''
        }
    },
    data(){
        return {
            loading : true,    //加载中
            loadingerror : false,    //加载失败
        }
    },
    watch : {
        src : {
            deep : true,
            immediate: true,
            handler(val){
                if(val){
                    this.getpdfnums(val)
                }
            }
        }
    },
    components: {
        pdf
    },
    methods:{
        //计算pdf页码总数
        getpdfnums(url) {
            this.loading = true
            //let loadurl = pdf.createloadingtask(url)
            let loadurl = pdf.createloadingtask({
                  url: url,//你的pdf地址
            })
 
            loadurl.promise.then(pdf => {
                this.$set(this, 'docspdf.numpages', pdf.numpages)
                this.loading = false
            }).catch(err => {
                this.loading = false;
                this.loadingerror = true;
            })
        }
    }
}
</script>

3、当pdf 有很多页的时候，直接v-for 循环，直接显示完

<template>
    <div class="ins-submit-docs-content ins-submit-docs-pdf">
        <div v-if="loading" style="position: absolute; top: 40%; width: 100%;text-align: center;">
            <van-loading type="spinner" color="#fc8955" />
        </div>
        <van-empty description="文档加载失败" v-if="loadingerror" />
        <pdf ref="morepdf" :src="src" :page="i" v-for="i in numpages" :key="i"></pdf>
    </div>
</template>

<script>
import vue from 'vue';
import pdf from 'vue-pdf'
import { loading } from 'vant';
vue.use(loading);
 
export default {
    name : 'ins-docs-pdf',
    props : {
        src : {
            type : string,    //默认值，选中值
            default : ''
        }
    },
    data(){
        return {
            loading : true,    //加载中
            loadingerror : false,    //加载失败
            numpages : 0,        
        }
    },
    watch : {
        src : {
            deep : true,
            immediate: true,
            handler(val){
                if(val){
                    this.getpdfnums(val)
                }
            }
        }
    },
    components: {
        pdf
    },
    methods:{
        //计算pdf页码总数
        getpdfnums(url) {
            this.loading = true
            //let loadurl = pdf.createloadingtask(url)
            let loadurl = pdf.createloadingtask({
                  url: url,//你的pdf地址
            })
 
            loadurl.promise.then(pdf => {
                this.numpages = pdf.numpages
                this.$set(this, 'docspdf.numpages', pdf.numpages)
                this.loading = false
            }).catch(err => {
                this.loading = false;
                this.loadingerror = true;
            })
        }
    }
}
</script>

4、当pdf很大的时候，你会发现pdf加载回很慢，并且偶尔会跳出加载；

这时就用到了下边的代码；pdf分页展示；

并且解决pdf预览的时候偶尔中文会乱码，借用vue-pdf中cmapreaderfactory

<template>
    <div class="ins-submit-docs-content ins-submit-docs-pdf">
        <div v-if="loading" style="position: absolute; top: 40%; width: 100%;text-align: center;">
            <van-loading type="spinner" color="#fc8955" />
        </div>
        <van-empty description="文档加载失败" v-if="loadingerror" />
        <div v-show="numpages <= 50">
            <pdf ref="morepdf" :src="src" :page="i" v-for="i in numpages" :key="i"></pdf>
        </div>
        <div v-show="numpages > 50">
            <pdf ref="pdf" :src="src" :page="currentpage" @num-pages="numpages=$event" @loaded="loadpdfhandler"></pdf>
            <div class="ins-pdf-button-box">
                <span @click.stop="prepage">上一页</span>
                <span>{{currentpage}}/{{numpages}}</span>
                <span @click.stop="nextpage">下一页</span>
            </div>
        </div>
    </div>
</template>

<script>
import vue from 'vue';
import pdf from 'vue-pdf'
import cmapreaderfactory from 'vue-pdf/src/cmapreaderfactory.js';
import { loading } from 'vant';
vue.use(loading);
 
export default {
    name : 'ins-docs-pdf',
    props : {
        src : {
            type : string,    //默认值，选中值
            default : ''
        }
    },
    data(){
        return {
            loading : true,    //加载中
            loadingerror : false,    //加载失败
            numpages : 0,        //分页
            currentpage : 1, //当前显示页数
        }
    },
    watch : {
        src : {
            deep : true,
            immediate: true,
            handler(val){
                if(val){
                    this.getpdfnums(val)
                }
            }
        }
    },
    components: {
        pdf
    },
    methods:{
        //计算pdf页码总数
        getpdfnums(url) {
            this.loading = true
            //let loadurl = pdf.createloadingtask(url)
            let loadurl = pdf.createloadingtask({
                  url: url,//你的pdf地址
                  cmapreaderfactory
            })
 
            loadurl.promise.then(pdf => {
                this.numpages = pdf.numpages
                this.currentpage = 1
                this.$set(this, 'docspdf.numpages', pdf.numpages)
                this.loading = false
            }).catch(err => {
                this.loading = false;
                this.loadingerror = true;
            })
        },
 
        // 上一页
        prepage() {
            var page = this.currentpage
            page = page > 1 ? page - 1 : this.numpages
            this.currentpage = page
        },
 
        // 下一页
        nextpage() {
            var page = this.currentpage
            page = page < this.numpages ? page + 1 : 1
            this.currentpage = page
        },
 
        // 回调
        loadpdfhandler(e) {
            this.currentpage = e
        }
    }
}
</script>