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VUE-PDF實現(xiàn)pdf在線預(yù)覽問題

更新時間：2023年10月24日 10:08:40 作者：逩跑鍀小學(xué)生

這篇文章主要介紹了VUE-PDF實現(xiàn)pdf在線預(yù)覽問題,具有很好的參考價值,希望對大家有所幫助,如有錯誤或未考慮完全的地方,望不吝賜教

1、首先安裝vue-pdf

在命令行中輸入如下代碼：

npm install --save vue-pdf

2、頁面引用

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="文檔加載失敗" 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,    //默認(rèn)值，選中值
            default : ''
        }
    },
    data(){
        return {
            loading : true,    //加載中
            loadingError : false,    //加載失敗
        }
    },
    watch : {
        src : {
            deep : true,
            immediate: true,
            handler(val){
                if(val){
                    this.getPDFnums(val)
                }
            }
        }
    },
    components: {
        pdf
    },
    methods:{
        //計算pdf頁碼總數(shù)
        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、當(dāng)PDF有很多頁的時候

直接v-for 循環(huán)，直接顯示完

<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="文檔加載失敗" 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,    //默認(rèn)值，選中值
            default : ''
        }
    },
    data(){
        return {
            loading : true,    //加載中
            loadingError : false,    //加載失敗
            numPages : 0,        
        }
    },
    watch : {
        src : {
            deep : true,
            immediate: true,
            handler(val){
                if(val){
                    this.getPDFnums(val)
                }
            }
        }
    },
    components: {
        pdf
    },
    methods:{
        //計算pdf頁碼總數(shù)
        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、當(dāng)PDF很大的時候

你會發(fā)現(xiàn)PDF加載回很慢，并且偶爾會跳出加載；

這時就用到了下邊的代碼；PDF分頁展示；

并且解決PDF預(yù)覽的時候偶爾中文會亂碼，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="文檔加載失敗" 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">上一頁</span>
                <span>{{currentPage}}/{{numPages}}</span>
                <span @click.stop="nextPage">下一頁</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,    //默認(rèn)值，選中值
            default : ''
        }
    },
    data(){
        return {
            loading : true,    //加載中
            loadingError : false,    //加載失敗
            numPages : 0,        //分頁
            currentPage : 1, //當(dāng)前顯示頁數(shù)
        }
    },
    watch : {
        src : {
            deep : true,
            immediate: true,
            handler(val){
                if(val){
                    this.getPDFnums(val)
                }
            }
        }
    },
    components: {
        pdf
    },
    methods:{
        //計算pdf頁碼總數(shù)
        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;
            })
        },
 
        // 上一頁
        prePage() {
            var page = this.currentPage
            page = page > 1 ? page - 1 : this.numPages
            this.currentPage = page
        },
 
        // 下一頁
        nextPage() {
            var page = this.currentPage
            page = page < this.numPages ? page + 1 : 1
            this.currentPage = page
        },
 
        // 回調(diào)
        loadPdfHandler(e) {
            this.currentPage = e
        }
    }
}
</script>