vue導出含echarts的html | PDF

要導出的vue組件以下:css

<div id="id" ref="resume">
    <button @click="downloadHtml('報告')">html</button>
    <button @click="getPdf('id',報告')">pdf</button>
    <situation></situation>
</div>
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一、vue導出.html文件html

HTML頁面由.css、htmlDom標籤組成,將css設置成js經過export導出,htmlDom能夠經過$el.innerHTML得到,也可經過document.getElementById('id')得到 。而後構造html頁面,使用createObjectURL建立一個文件流下載。代碼以下:vue

import {resumecss} from '@/styles/download.css.js'
import writer from 'file-writer'

methods:{
    download(name){  
        let html = this.getHtml();
        let s = writer(`${name}.html`, html, 'utf-8');
    },
    getHtml(){
         const template = this.$refs.resume.innerHTML      
         let html = `<!DOCTYPE html>
                 <html>
                 <head>
                 <meta charset="utf-8">
                 <meta name="viewport" content="width=device-width,initial-scale=1.0">
                 <title>html</title>
                <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
                <style> ${resumecss} </style>
                </head>
                <body>
                <div style="margin:0 auto;width:1200px">
                ${template}
                </div>
                </body>
                </html>`
                return html
      },
}
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安裝 'file-writer' 包,也能夠寫原生代碼。以下:npm

1> 安裝 'file-writer' 包: npm install -D file-writer
2> 原生代碼:
function writer(fileName,content,option){
     var a = document.createElement('a');
     var url = window.URL.createObjectURL(new Blob([content],
        { type: (option.type || "text/plain") + ";charset=" + (option.encoding || 'utf-8') }));
     a.href = url;
     a.download = fileName || 'file';
     a.click();
     window.URL.revokeObjectURL(url);
 }
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download.css.jselement-ui

export const resumecss = `
  html,body{
    padding: 0;
    margin: 0;
  }
  ...
`
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若是導出的頁面含echarts, 須要在 series 中設置 animation: false, 做用是關閉動畫。canvas

導出echarts通常是將其轉成圖片,使用圖片展現。echarts

this.url = this.chart.getDataURL({
    pixelRatio: 2,
    backgroundColor: '#192636'
});
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我以前一直有一個思想誤區,就是點擊下載的時候給子組件傳值,讓其圖片顯示echarts隱藏,後來發現徹底不必,只需加一個class,在download.css.js控制顯隱,簡單粗暴。jsp

二、導出PDF動畫

建立htmlToPdf.js頁面ui

// 導出頁面爲PDF格式
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'
export default{
  install (Vue, options) {
    Vue.prototype.getPdf = function (id,title) {
      html2Canvas(document.querySelector(`#${id}`), {
        allowTaint: true
        // useCORS:true
      }).then(function (canvas) {
        let contentWidth = canvas.width
        let contentHeight = canvas.height
        let pageHeight = contentWidth / 592.28 * 841.89
        let leftHeight = contentHeight
        let position = 0
        let imgWidth = 595.28
        let imgHeight = 592.28 / contentWidth * contentHeight
        let pageData = canvas.toDataURL('image/jpeg', 1.0)
        let PDF = new JsPDF('', 'pt', 'a4')
        if (leftHeight < pageHeight) {
          PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
        } else {
          while (leftHeight > 0) {
            PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
            leftHeight -= pageHeight
            position -= 841.89
            if (leftHeight > 0) {
              PDF.addPage()
            }
          }
        }
        PDF.save(title + '.pdf')
      }
      )
    }
  }

}
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在main.js中引入

import htmlToPdf from '@/components/utils/htmlToPdf'
Vue.use(htmlToPdf)
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下載PDF只需使用 getPdf('id', '報告') 便可。

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