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从零开始Vue3+Element Plus后台管理系统(十四)——PDF预览和打印

其实我常常会纠结今天要写什么内容。

因为希望能够保持每日更新,所以要写的内容不能太难——最好是半天可以搞出demo并且输出文章,所以很多东西浅尝辄止,并没有深入研究,还写出了一些bug 🐛

今天又浅浅的研究了下在Vue3中如何预览PDF

image.png

vue-pdf-embed

刚开始尝试 vue3-pdfjs,可以很快做出预览界面,但它没有自带打印功能,所以继续在github中翻啊翻。

最终选择了vue-pdf-embed https://github.com/hrynko/vue-pdf-embed#examples,它的功能强大一些,可以满足预览和打印的功能。

npm install vue-pdf-embed

缩放

初始化时获取容器宽度,把组件的width设为容器宽度数值,然后通过调整width的值来控制缩放。

// 设置初始宽度
onMounted(() => {
  wpWidth = wpRef.value.clientWidth
  width.value = wpWidth
})

function zoom(type: number) {
  if ((scale.value < 0.3 && type === -1) || (scale.value > 5 && type === 1)) return

  scale.value = scale.value + type * 0.1
  width.value = scale.value * wpWidth
}

打印

调用print(),配置参数

print resolution (number) 分辨率,
filename (string),
all pages flag (boolean)


function print() {
  pdfRef.value.print(150, null, true)
}

image.png

完整代码

<!-- 样式使用了tailwind CSS -->
<template>
  <div class="m-4 shadow"> 
  <!-- v-adaptive是自定义的一个指令,详见:https://juejin.cn/post/7232106423244243002 -->
    <div v-adaptive>
      <vue-pdf-embed
        ref="pdfRef"
        :source="pdfSource"
        :page="page"
        :width="width"
        class="transition-all"
        @password-requested="handlePasswordRequest"
        @rendered="handleDocumentRender"
      />
    </div>

    <div class="flex items-center justify-center py-2" ref="wpRef">
      <el-button :disabled="page <= 1" @click="page--"></el-button>
      <span class="mx-4">{{ page }} / {{ pageCount }}</span>
      <el-button :disabled="page >= pageCount" @click="page++"></el-button>

      <i-ep:zoom-out
        @click="zoom(-1)"
        class="ml-8 text-lg cursor-pointer"
        :class="scale < 0.3 ? 'text-gray-300 cursor-not-allowed	' : ''"
      ></i-ep:zoom-out>
      <i-ep:zoom-in
        @click="zoom(1)"
        class="ml-4 text-lg cursor-pointer"
        :class="scale > 5 ? 'text-gray-300 cursor-not-allowed	' : ''"
      ></i-ep:zoom-in>

      <el-button @click="print" class="ml-8">打印</el-button>
    </div>
  </div>
</template>

<script setup lang="ts">
import { ref, onMounted } from 'vue'
import VuePdfEmbed from 'vue-pdf-embed'

const pdfRef = ref()
const wpRef = ref()

let pdfSource = ref('/L16 心动-编配谱.pdf')
let isLoading = ref(true)
let page = ref(1)
let scale = ref(1)
let pageCount = ref(0)
let wpWidth = 0
let width = ref(0)

onMounted(() => {
  wpWidth = wpRef.value.clientWidth
  width.value = wpWidth
})

function handleDocumentRender() {
  isLoading.value = false
  pageCount.value = pdfRef.value.pageCount
}

function zoom(type: number) {
  if ((scale.value < 0.3 && type === -1) || (scale.value > 5 && type === 1)) return

  scale.value = scale.value + type * 0.1
  width.value = scale.value * wpWidth
}

function print() {
  pdfRef.value.print(150, null, true)
}
function handlePasswordRequest(callback: any, retry) {
  callback(prompt(retry ? 'Enter password again' : 'Enter password'))
}
</script>

项目地址

本项目GIT地址:github.com/lucidity99/…

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