javascript 使用 jsPDF 生成保留 HTML 页面样式的 pdf
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Generating a pdf that preserves styling of the HTML page with jsPDF
提问by Virge Assault
I'm trying to create a button that will start the automatic download of a PDF of the page as it looks with the sass styling. However, everything I try ends up with the styling messed up.
我正在尝试创建一个按钮，该按钮将开始自动下载页面的 PDF，因为它看起来像 sass 样式。然而，我尝试的一切最终都以样式搞砸了。
Here is the page (this is a testing site with several different content types)
这是页面（这是一个具有多种不同内容类型的测试站点）
But the PDF comes out looking like this:
但是 PDF 看起来像这样：
I'm pulling jspdf.debug.jsand have the following HTML button+script in my page:
我正在拉动jspdf.debug.js并在我的页面中包含以下 HTML 按钮 + 脚本：
<div id="bypass"> <!-- keeps button from showing in PDF -->
<button id="pdf-new" style="margin: 50px;"><a href="javascript:demoFromHTML()" class="button" style="color: black;">Generate PDF</a></button>
</div>
<script>
function demoFromHTML() {
var pdf = new jsPDF('p', 'pt', 'letter');
// source can be HTML-formatted string, or a reference
// to an actual DOM element from which the text will be scraped.
source = $('#content')[0];
// we support special element handlers. Register them with jQuery-style
// ID selector for either ID or node name. ("#iAmID", "div", "span" etc.)
// There is no support for any other type of selectors
// (class, of compound) at this time.
specialElementHandlers = {
// element with id of "bypass" - jQuery style selector
'#bypass': function (element, renderer) {
// true = "handled elsewhere, bypass text extraction"
return true
}
};
margins = {
top: 80,
bottom: 60,
left: 40,
width: 522
};
// all coords and widths are in jsPDF instance's declared units
// 'inches' in this case
pdf.fromHTML(
source, // HTML string or DOM elem ref.
margins.left, // x coord
margins.top, { // y coord
'width': margins.width, // max width of content on PDF
'elementHandlers': specialElementHandlers
},
function (dispose) {
// dispose: object with X, Y of the last line add to the PDF
// this allow the insertion of new lines after html
pdf.save('Test.pdf');
}, margins);
}
</script>
How can I make the styling stay consistent from the html to the pdf?
如何使样式从 html 到 pdf 保持一致？
回答by Virge Assault
I ended up getting this to work by using html2canvasalong with jsPDF.
我最终通过使用html2canvas和jsPDF来实现这一点。
My button that hides itself from pdf with an html2canvas option:
我的按钮使用 html2canvas 选项从 pdf 中隐藏自己：
<div data-html2canvas-ignore="true">
<button id="pdf-new"><a href="javascript:demoFromHTML()" class="button" style="color: black;">Generate PDF</a></button>
</div>
And the script for the bottom of the html page
以及 html 页面底部的脚本
<script>
function demoFromHTML() {
var pdf = new jsPDF('p', 'pt', 'letter');
var options = {
background: '#fff' //background is transparent if you don't set it, which turns it black for some reason.
};
pdf.addHTML($('#content')[0], options, function () {
pdf.save('Test.pdf');
});
}
</script>
Also in html2canvas.js I changed:
同样在 html2canvas.js 我改变了：
_html2canvas.Util.isTransparent = function(backgroundColor) {
return (backgroundColor === "transparent" || backgroundColor === "rgba(0, 0, 0, 0)");
};
to this, in order to avoid that transparent-to-black background
对此，为了避免透明到黑色的背景
_html2canvas.Util.isTransparent = function(backgroundColor) {
return (backgroundColor === "transparent" || backgroundColor === "rgba(0, 0, 0, 0)" || backgroundColor === undefined);
};
Hope that helps someone!
希望对某人有所帮助！
