需要做一个导出PDF的功能,网上找有很多,但是一般导出来的都是比较模糊的那种,下面这个是高清版的,导出的PDF都是几M,跟正常手动导出的差不多,很清晰。
首先用到的JS有:
代码语言:javascript复制<script type="text/javascript" charset="utf-8" src="js/html2canvas.js"></script>
<script type="text/javascript" charset="utf-8" src="js/jsPdf.debug.js"></script>
<script type="text/javascript" charset="utf-8" src="js/canvas2image.js"></script>
代码:
代码语言:javascript复制 <script>
function exportReportTemplet() {
var element = $("#print"); // 这个dom元素是要导出pdf的div容器
var w = element.width(); // 获得该容器的宽
var h = element.height(); // 获得该容器的高
var offsetTop = element.offset().top; // 获得该容器到文档顶部的距离
var offsetLeft = element.offset().left; // 获得该容器到文档最左的距离
var canvas = document.createElement("canvas");
canvas.width = w * 2; // 将画布宽&&高放大两倍
canvas.height = h * 2;
var context = canvas.getContext("2d");
var scale = 2;
context.scale(2, 2);
// context.translate(-offsetLeft - abs, -offsetTop);
var opts = {
scale: scale,
canvas: canvas,
width: w,
height: h,
useCORS: true,
background: '#FFF'
}
html2canvas(element, opts).then(function (canvas) {
allowTaint: false;
taintTest: false;
var contentWidth = canvas.width;
var contentHeight = canvas.height;
//一页pdf显示html页面生成的canvas高度;
var pageHeight = contentWidth / 592.28 * 841.89;
//未生成pdf的html页面高度
var leftHeight = contentHeight;
//页面偏移
var position = 0;
//a4纸的尺寸[595.28,841.89],html页面生成的canvas在pdf中图片的宽高
var imgWidth = 595.28;
var imgHeight = 592.28 / contentWidth * contentHeight;
var pageData = canvas.toDataURL('image/jpeg', 1.0);
// var oCanvas = document.getElementById("print");
// Canvas2Image.saveAsJPEG(oCanvas);
var pdf = new jsPDF('', 'pt', 'a4');
//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)
//当内容未超过pdf一页显示的范围,无需分页
if (leftHeight < pageHeight) {
pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
} else { // 分页
while (leftHeight > 0) {
pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
leftHeight -= pageHeight;
position -= 841.89;
//避免添加空白页
if (leftHeight > 0) {
pdf.addPage();
}
}
}
pdf.save('销售合同.pdf');
})
}
</script>