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88 lines
4.5 KiB
88 lines
4.5 KiB
$(function () {
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$("#downloadPdf").click(function () {
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var targetDom = $("#pdfContainer");
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//把需要导出的pdf内容clone一份，这样对它进行转换、微调等操作时才不会影响原来界面
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var copyDom = targetDom.clone();
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//新的div宽高跟原来一样，高度设置成自适应，这样才能完整显示节点中的所有内容（比如说表格滚动条中的内容）
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copyDom.width(targetDom.width() + "px");
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copyDom.height(targetDom.height() + "px");
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$('body').append(copyDom);//ps:这里一定要先把copyDom append到body下，然后再进行后续的glyphicons2canvas处理，不然会导致图标为空
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svg2canvas(copyDom);
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html2canvas(copyDom, {
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onrendered: function (canvas) {
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var imgData = canvas.toDataURL('image/jpeg');
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var img = new Image();
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img.src = imgData;
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//根据图片的尺寸设置pdf的规格，要在图片加载成功时执行，之所以要*0.225是因为比例问题
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img.onload = function () {
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//此处需要注意，pdf横置和竖置两个属性，需要根据宽高的比例来调整，不然会出现显示不完全的问题
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if (this.width > this.height) {
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var doc = new jsPDF('l', 'mm', [this.width * 0.225, this.height * 0.225]);
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} else {
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var doc = new jsPDF('p', 'mm', [this.width * 0.225, this.height * 0.225]);
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}
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doc.addImage(imgData, 'jpeg', 0, 0, this.width * 0.225, this.height * 0.225);
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//根据下载保存成不同的文件名
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doc.save('pdf_' + new Date().getTime() + '.pdf');
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};
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//删除复制出来的div
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copyDom.remove();
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},
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background: "#fff",
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//这里给生成的图片默认背景，不然的话，如果你的html根节点没设置背景的话，会用黑色填充。
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allowTaint: true //避免一些不识别的图片干扰，默认为false，遇到不识别的图片干扰则会停止处理html2canvas
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});
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});
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});
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function svg2canvas(targetElem) {
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var svgElem = targetElem.find('svg');
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svgElem.each(function (index, node) {
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var parentNode = node.parentNode;
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//由于现在的IE不支持直接对svg标签node取内容，所以需要在当前标签外面套一层div，通过外层div的innerHTML属性来获取
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var tempNode = document.createElement('div');
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tempNode.appendChild(node);
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var svg = tempNode.innerHTML;
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var canvas = document.createElement('canvas');
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//转换
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canvg(canvas, svg);
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parentNode.appendChild(canvas);
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});
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}
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function glyphicons2canvas(targetElem, fontClassName, fontFamilyName) {
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var iconElems = targetElem.find('.' + fontClassName);
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iconElems.each(function (index, inconNode) {
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var fontSize = $(inconNode).css("font-size");
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var iconColor = $(inconNode).css("color");
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var styleContent = $(inconNode).attr('style');
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//去掉"px"
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fontSize = fontSize.replace("px", "");
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var charCode = getCharCodeByGlyphiconsName(iconName);
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var myCanvas = document.createElement('canvas');
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//把canva宽高各增加2是为了显示图标完整
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myCanvas.width = parseInt(fontSize) + 2;
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myCanvas.height = parseInt(fontSize) + 2;
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myCanvas.style = styleContent;
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var ctx = myCanvas.getContext('2d');
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//设置绘图内容的颜色
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ctx.fillStyle = iconColor;
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//设置绘图的字体大小以及font-family的名字
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ctx.font = fontSize + 'px ' + fontFamilyName;
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ctx.fillText(String.fromCharCode(charCode), 1, parseInt(fontSize) + 1);
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$(inconNode).replaceWith(myCanvas);
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});
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}
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//根据glyphicons/glyphicon图标的类名获取到对应的char code
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function getCharCodeByGlyphiconsName(iconName) {
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switch (iconName) {
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case("glyphicons-resize-full"):
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return "0xE216";
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case ("glyphicons-chevron-left"):
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return "0xE225";
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default:
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return "";
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}
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}
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