javascript - 使用 jsPDF 生成保留 HTML 页面样式的 pdf

Question

我正在尝试创建一个按钮，该按钮将开始自动下载具有 sass 样式的页面的 PDF。然而，我尝试的一切都以样式困惑告终。

这是页面(这是一个具有多种不同内容类型的测试站点)

但是 PDF 看起来像这样:

我正在拉取 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>

如何使样式从 html 到 pdf 保持一致？

Answer 1

我最终通过使用 html2canvas 让它工作连同 jsPDF .

我的按钮使用 html2canvas 选项隐藏了自己:

<div data-html2canvas-ignore="true">
    <button id="pdf-new"><a href="javascript:demoFromHTML()" class="button" style="color: black;">Generate PDF</a></button>
</div>

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>

同样在 html2canvas.js 中我改变了:

_html2canvas.Util.isTransparent = function(backgroundColor) {
  return (backgroundColor === "transparent" || backgroundColor === "rgba(0, 0, 0, 0)");
};

为了避免透明变黑的背景

_html2canvas.Util.isTransparent = function(backgroundColor) {
  return (backgroundColor === "transparent" || backgroundColor === "rgba(0, 0, 0, 0)" || backgroundColor === undefined);
};

希望对某人有所帮助!