web printing function
这篇文章主要介绍了关于web 打印功能，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下
在项目开发中有时候会碰到要求打印页面中的数据的功能需求。需求原因主要有两点吧，一是需要打印的数据只是页面的一部分即页面的区域打印，比如只需要打印页面中表格里面选中的数据等，二是需要打印出来的样式和页面展示的样式有差别，比如需要将表格中的列竖着打印出来。
我在开发中主要用到的就是window.print()这个js函数，这个函数相当于在页面中右键打印那个功能，但如果直接使用这个函数会将整个页面打印出来。所以我们对页面数据的隐藏或者重写一个页面，得到我们想要打印的数据和样式。
1、隐藏不需要打印的数据
这种方式只能针对打印出来的样式和页面样式没什么差别的
贴代码
<style type="text/css" media="print">
/* 不需要打印的区域*/
.notPreview{
display: none;
}
</style>然后调用window.print()即可
2、得到需要打印的数据，按照打印的样式，重写一个页面进行打印
先贴代码
bdhtml = window.document.body.innerHTML; window.document.body.innerHTML = prnhtml; window.print(); window.document.body.innerHTML = bdhtml; window.document.location.reload();
在这个里面，bdhtml为原始的页面。prnhtml为真正调用右键打印的页面，需要根据实际情况进行拼接。在页面调用打印之后将页面恢复为原始页面，并reload,防止js函数不能正常使用。
在这之后还会遇到的问题 就是页眉、页脚、边距等这些了，这些实际上都是写在注册表里面的，所以需要修改注册表。
function PageSetup(name,value) {
try{
var HKEY_Path = "HKEY_CURRENT_USER\\Software\\Microsoft\\Internet Explorer\\PageSetup\\";
var Wsh = new ActiveXObject("WScript.Shell");
Wsh.RegWrite(HKEY_Path+name,value);
}catch(e){
alert("需要运行ActiveX才能进行打印");
}
}
PageSetup("header",""); // 页眉为空
PageSetup("footer","");//页脚为空
PageSetup("margin_left","0mm");//左边距为0
PageSetup("margin_top","0mm");//上边距为0name 大致有这些：header（页眉），footer（页脚），margin_bottom（下边距），margin_left（左边距），margin_right（右边距），margin_top（上边距）
value的一些常用的大致有这些： &w 窗口标题 、&u 网页地址 (URL) 、&d 短日期格式（由“控制面板”中的“区域设置”指定）、&D 长日期格式（由“控制面板”中的“区域设置”指定） 、&t 由“控制面板”中的“区域设置”指定的时间格式 、&T 24 小时时间格式 、&p 当前页号 、&P 网页总数 、&& 单个 & 号 (&) 、&b 紧跟在这些字符之后的文本居中打印。 、 &b&b 紧跟在第一个 "&b" 之后的文本居中打印，跟在第二个 "&b" 之后的文本按右对齐方式打印。
大概能满足大部分的基本要求吧，我也是个了解的很浅，还请大家多多指教！
以上就是本文的全部内容，希望对大家的学习有所帮助，更多相关内容请关注PHP中文网！
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