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import html2canvas from 'html2canvas'
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/*import jsPDF from 'jspdf'*/
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export default{
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install (Vue, options) {
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Vue.prototype.getPdf = function (htmlTitle,currentTime) {
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var element = document.getElementById("file");
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html2canvas(element, {
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logging:false
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}).then(function(canvas) {
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var pdf = new jsPDF('p', 'mm', 'a4'); //A4纸，纵向
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var ctx = canvas.getContext('2d'),
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a4w = 190, a4h = 277, //A4大小，210mm x 297mm，四边各保留10mm的边距，显示区域190x277
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imgHeight = Math.floor(a4h * canvas.width / a4w), //按A4显示比例换算一页图像的像素高度
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renderedHeight = 0;
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while(renderedHeight < canvas.height) {
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var page = document.createElement("canvas");
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page.width = canvas.width;
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page.height = Math.min(imgHeight, canvas.height - renderedHeight);//可能内容不足一页
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//用getImageData剪裁指定区域，并画到前面创建的canvas对象中
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page.getContext('2d').putImageData(ctx.getImageData(0, renderedHeight, canvas.width, Math.min(imgHeight, canvas.height - renderedHeight)), 0, 0);
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pdf.addImage(page.toDataURL('image/jpeg', 1.0), 'JPEG', 10, 10, a4w, Math.min(a4h, a4w * page.height / page.width)); //添加图像到页面，保留10mm边距
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renderedHeight += imgHeight;
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if(renderedHeight < canvas.height)
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pdf.addPage();//如果后面还有内容，添加一个空页
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//不使用JQuery版的
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import html2canvas from 'html2canvas';
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import JsPDF from 'jspdf';
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/**
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* @param ele 要生成 pdf 的DOM元素（容器）
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* @param padfName PDF文件生成后的文件名字
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* */
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function downloadPDF(ele, pdfName){
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let eleW = ele.offsetWidth;// 获得该容器的宽
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let eleH = ele.offsetHeight;// 获得该容器的高
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let eleOffsetTop = ele.offsetTop; // 获得该容器到文档顶部的距离
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let eleOffsetLeft = ele.offsetLeft; // 获得该容器到文档最左的距离
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var canvas = document.createElement("canvas");
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var abs = 0;
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let win_in = document.documentElement.clientWidth || document.body.clientWidth; // 获得当前可视窗口的宽度（不包含滚动条）
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let win_out = window.innerWidth; // 获得当前窗口的宽度（包含滚动条）
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if(win_out>win_in){
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// abs = (win_o - win_i)/2; // 获得滚动条长度的一半
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abs = (win_out - win_in)/2; // 获得滚动条宽度的一半
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// console.log(a, '新abs');
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}
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pdf.save(htmlTitle);
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});
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canvas.width = eleW * 2; // 将画布宽&&高放大两倍
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canvas.height = eleH * 2;
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var context = canvas.getContext("2d");
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context.scale(2, 2);
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context.translate(-eleOffsetLeft -abs, -eleOffsetTop);
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// 这里默认横向没有滚动条的情况，因为offset.left(),有无滚动条的时候存在差值，因此
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// translate的时候，要把这个差值去掉
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// html2canvas(element).then( (canvas)=>{ //报错
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// html2canvas(element[0]).then( (canvas)=>{
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html2canvas( ele, {
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dpi: 300,
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// allowTaint: true, //允许 canvas 污染， allowTaint参数要去掉，否则是无法通过toDataURL导出canvas数据的
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useCORS:true //允许canvas画布内 可以跨域请求外部链接图片, 允许跨域请求。
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} ).then( (canvas)=>{
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var contentWidth = canvas.width;
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var contentHeight = canvas.height;
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//一页pdf显示html页面生成的canvas高度;
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var pageHeight = contentWidth / 592.28 * 841.89;
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//未生成pdf的html页面高度
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var leftHeight = contentHeight;
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//页面偏移
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var position = 0;
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//a4纸的尺寸[595.28,841.89]，html页面生成的canvas在pdf中图片的宽高
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var imgWidth = 595.28;
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var imgHeight = 595.28/contentWidth * contentHeight;
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var pageData = canvas.toDataURL('image/jpeg', 1.0);
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var pdf = new JsPDF('', 'pt', 'a4');
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//有两个高度需要区分，一个是html页面的实际高度，和生成pdf的页面高度(841.89)
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//当内容未超过pdf一页显示的范围，无需分页
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if (leftHeight < pageHeight) {
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//在pdf.addImage(pageData, 'JPEG', 左，上，宽度，高度)设置在pdf中显示；
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pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
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// pdf.addImage(pageData, 'JPEG', 20, 40, imgWidth, imgHeight);
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} else { // 分页
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while(leftHeight > 0) {
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pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
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leftHeight -= pageHeight;
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position -= 841.89;
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//避免添加空白页
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if(leftHeight > 0) {
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pdf.addPage();
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}
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}
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}
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//可动态生成
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pdf.save(pdfName);
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})
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}
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export default {
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downloadPDF
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} |
...
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...
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