js实现markdown转html转pdf
2018-08-15 本文已影响0人
洋洋洒洒_6a20
话不多说直接上代码
将下面的代码复制，保存为html文件在游览器中打开即可使用
按 ctrl+p 也可转pdf js实现的pdf实际为截图后保存为pdf
使用github-markdown-css样式
个人blog+bbs www.youngboy.vip
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>md文本测试</title>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/marked/0.3.4/marked.min.js"></script>
<script src="https://linwalker.github.io/render-html-to-pdf/js/html2canvas.js"></script>
<script src="https://linwalker.github.io/render-html-to-pdf/js/jsPdf.debug.js"></script>
<script src="http://cdn.bootcss.com/highlight.js/8.0/highlight.min.js"></script>
<link rel="stylesheet" href="https://sindresorhus.com/github-markdown-css/github-markdown.css">
<style>
#edit {display: flex; justify-content: space-between;}
#content {width: 49%;float: left;height: auto;}
.button {
color: #fff;
background-color: #009a61;
border-color: #008151;
padding: 0 13px;
font-size: 14px;
border-radius: 4px;
margin: 10px;
}
#show{width: 50%; border: 1px solid #ddd; padding: 50px; box-sizing: border-box;float: left;height: auto;}
.hljs-comment,.hljs-quote {
color:#989498
}
.hljs-variable,.hljs-template-variable,.hljs-attribute,.hljs-tag,.hljs-name,.hljs-selector-id,.hljs-selector-class,.hljs-regexp,.hljs-link,.hljs-deletion {
color:#dd464c
}
.hljs-number,.hljs-built_in,.hljs-builtin-name,.hljs-literal,.hljs-type,.hljs-params {
color:#fd8b19
}
.hljs-class .hljs-title {
color:#fdcc59
}
.hljs-string,.hljs-symbol,.hljs-bullet,.hljs-addition {
color:#8fc13e
}
.hljs-meta {
color:#149b93
}
.hljs-function,.hljs-section,.hljs-title {
color:#1290bf
}
.hljs-keyword,.hljs-selector-tag {
color:#c85e7c
}
.hljs {
display:block;
background:#322931;
color:#b9b5b8;
padding:0.5em
}
.hljs-emphasis {
font-style:italic
}
.hljs-strong {
font-weight:bold
}
</style>
</head>
<body id="edit">
<div><button id="download" class="button">下载html</button><button class="button" id="downloadPdf">下载PDF</button></div>
<textarea id="content"></textarea>
<div id="show" class="typo markdown-body">content</div>
<script>
marked.setOptions({
renderer: new marked.Renderer(),
gfm: true,
tables: true,
escaped : true,
breaks: false,
pedantic: false,
sanitize: false,
smartLists: true,
smartypants: false,
highlight: function (code, lang) {
return hljs.highlightAuto(code).value;
}
});
$("#content").on("input propertychange", function() {
var val = $(this).val();
$("#show").html(marked(val));
});
function downloadFile(fileName, content){
var aLink = document.createElement('a');
var blob = new Blob([content]);
var evt = document.createEvent("HTMLEvents");
aLink.download = fileName;
aLink.href = URL.createObjectURL(blob);
aLink.click();
}
$("#download").click(e=>{
var tpl = new Template($('#tpl').html());
var s = tpl.render({
title: "markdown",
style:$("style").html(),
content:$("#show").html()
});
downloadFile("markdown.html",s);
});
function Template(tpl) {
var
fn,
match,
code = ['var r=[];\nvar _html = function (str) { return str; };'],
re = /\{\s*([a-zA-Z\.\_0-9()]+)(\s*\|\s*safe)?\s*\}/m,
addLine = function (text) {
code.push('r.push(\'' + text.replace(/\'/g, '\\\'').replace(/\n/g, '\\n').replace(/\r/g, '\\r') + '\');');
};
while (match = re.exec(tpl)) {
if (match.index > 0) {
addLine(tpl.slice(0, match.index));
}
if (match[2]) {
code.push('r.push(String(this.' + match[1] + '));');
}
else {
code.push('r.push(_html(String(this.' + match[1] + ')));');
}
tpl = tpl.substring(match.index + match[0].length);
}
addLine(tpl);
code.push('return r.join(\'\');');
fn = new Function(code.join('\n'));
this.render = function (model) {
return fn.apply(model);
};
}
$("#downloadPdf").click(e=>{
html2canvas(document.body, {
onrendered:function(canvas) {
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 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 {
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('content.pdf');
}
})
});
</script>
<script id="tpl" type="text/plain">
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, minimal-ui">
<title>GitHub Markdown CSS demo</title>
<link rel="stylesheet" href="https://sindresorhus.com/github-markdown-css/github-markdown.css">
<style>
@media (min-width: 768px) {
.markdown-body {
box-sizing: border-box;
min-width: 200px;
max-width: 980px;
margin: 0 auto;
padding: 45px;
}
}
</style>
</head>
<body>
<article class="markdown-body">
{content}
</article>
</body>
</html>
</script>
</body>
</html>
