Recently, a friend asked how to print preview in js. Today I will explain it. First, let’s understand the printing principle. In fact, partial printing of the page is very simple. Just make a starting mark for the part you want to print. As for how to write the mark, you can write whatever you want. I will write here the content that needs to be printed
. Because the markup does not need to be seen by users, I added a comment! The specific implementation code is as follows:
<!DOCTYPE html>
<html>
<head>
<title>打印预览简单实现</title>
</head>
<body>
<div>
这是body 里的内容不需要打印，具体的页面设计根据自己的要求自行设计。如果需要一个页面多个tag,可以动态生成tag
</div>
<!--startprint-->
<div>
这是我需要打印的内容
</div>
<!--endprint-->
<script type="text/javascript">
function preview()
{
var bdhtml=window.document.body.innerHTML;//获取当前页的html代码
var startStr="<!--startprint-->";//设置打印开始区域
var endStr="<!--endprint-->";//设置打印结束区域
var printHtml=bdhtml.substring(bdhtml.indexOf(startStr)+startStr.length,bdhtml.indexOf(endStr));//从标记里获取需要打印的页面
window.document.body.innerHTML=printHtml;//需要打印的页面
window.print();
window.document.body.innerHTML=bdhtml;//还原界面
}
preview();
</script>
</body>
</html>
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