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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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-
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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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-
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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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-
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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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+
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+import html2canvas from 'html2canvas';
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+import JsPDF from 'jspdf';
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+
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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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+
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+function downloadPDF(ele, pdfName){
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+
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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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+
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+
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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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+
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+ var canvas = document.createElement("canvas");
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+ var abs = 0;
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+
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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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+
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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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}
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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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+
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+
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+
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+
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+ var context = canvas.getContext("2d");
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+
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+ context.scale(2, 2);
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+
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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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+
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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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+
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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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64
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+ var imgHeight = 595.28/contentWidth * contentHeight;
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+
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+ var pageData = canvas.toDataURL('image/jpeg', 1.0);
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+
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+
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+
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+ var pdf = new JsPDF('', 'pt', 'a4');
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+
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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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79
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+ while(leftHeight > 0) {
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80
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+ pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
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81
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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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}
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+ }
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+
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90
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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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+
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+}
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+
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+
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98
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+export default {
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+ downloadPDF
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} |
100
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} |
