asp.net中的“按需打印”(打印你需要打印的部分) 实现代码

  过程很简单:

  首先在asp.net页面中设定开始打印和结束打印的标记,为了确保该标记不在网页浏览时显示,我们采用"<!-- HTML注释 -->"的方式。比如:<!--startprint-->和<!--endprint-->。

  接着写相关的JavaScript代码,具体代码见后。

  如果不想打印按钮也被打印出来,注意将打印按钮包含在<!--startprint-->和<!--endprint-->之外。

  相关代码:

  

复制代码 代码如下:

  <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AppealPrint.aspx.cs" Inherits="Appeal.AppealPrint"

  MasterPageFile="MasterPage.master" Title="诉求打印" %>

  <asp:Content ID="Content1" ContentPlaceHolderID="CphNavigation" runat="server">

  </asp:Content>

  <asp:Content ID="Content2" ContentPlaceHolderID="CphContent" runat="server">

  <!--startprint-->

  <style type="text/css">

  body,table{

  font-size:12px;

  }

  table{

  table-layout:fixed;

  empty-cells:show;

  border-collapse: collapse;

  margin:0 auto;

  }

  td{

  height:20px;

  }

  h1,h2,h3{

  font-size:12px;

  margin:0;

  padding:0;

  }

  table{

  border:1px solid #cad9ea;

  color:#666;

  }

  table th{

  height:30px;

  }

  table td,table th{

  border:1px solid #cad9ea;

  padding:0 1em 0;

  }

  table tr{

  background-color:#f5fafe;

  }

  </style>

  <table class="border" cellspacing="0" cellpadding="2" style="margin: 0px auto; width: 98%;border:1px solid;border-collapse:collapse;" id="TabBtnPrint">

  <tbody>

  <tr align="center">

  <td class="title"><strong>诉 求 信 息</strong></td>

  </tr>

  <tr>

  <td style="height: 25px">

  <table cellspacing="1" cellpadding="2" style="margin: 0px auto; width: 100%;border-collapse:collapse;">

  <tbody>

  <tr class="tdbg">

  <td width="30%" align="right" nowrap="nowrap">诉求主题:</td>

  <td colspan="3">

  <asp:Label ID="lblEditTitle" runat="server" Text="Label"></asp:Label>

  </td>

  </tr>

  <tr class="tdbg">

  <td align="right" width="30%" nowrap="nowrap">诉求类型:</td>

  <td  colspan="3">

  <asp:Label ID="lblAppealCategory" runat="server" Text=""/>

  </td>

  </tr>

  <tr class="tdbg">

  <td align="right" width="30%" nowrap="nowrap">诉求当前状态:</td>

  <td colspan="3">

  <asp:Label ID="LblStatus" runat="server" Text="Label"/>

  </td>

  </tr>

  <tr class="tdbg">

  <td align="right" style="width: 30%" nowrap="nowrap">诉求性质:</td>

  <td style="width: 15%"><asp:Label ID="lblAppealNature" runat="server" Text="Label"/></td>

  <td align="right" style="width: 25%" nowrap="nowrap">被投诉人姓名:</td>

  <td style="width: 30%"><asp:Label ID="lblBeAppealName" runat="server" Text="Label"/></td>

  </tr>

  <tr class="tdbg">

  <td align="right" style="width: 30%" nowrap="nowrap">被投诉人地址:</td>

  <td style="width: 15%"><asp:Label ID="lblBeAppealAddress" runat="server" Text="Label"/></td>

  <td align="right" style="width: 25%" nowrap="nowrap">投诉人:</td>

  <td style="width: 30%"><asp:Label ID="lblUserName" runat="server" Text="Label"/></td>

  </tr>

  <tr class="tdbg">

  <td align="right" style="width: 30%" nowrap="nowrap">诉求信息是否保密:</td>

  <td style="width: 15%"><asp:Label ID="lblIsSecret" runat="server" Text="Label"/></td>

  <td align="right" style="width: 25%" nowrap="nowrap">管理员是否同意公开:</td>

  <td style="width: 30%" align="right"><asp:Label ID="lblAdminIsPublic" runat="server" Text="Label"/></td>

  </tr>

  <tr class="tdbg">

  <td align="right" style="width: 30%" nowrap="nowrap">浏览数:</td>

  <td style="width: 15%"><asp:Label ID="lblHits" runat="server" Text="Label"/></td>

  <td align="right" style="width: 25%" nowrap="nowrap">回复数:</td>

  <td style="width: 30%"><asp:Label ID="lblReply" runat="server" Text="Label"/></td>

  </tr>

  <tr class="tdbg">

  <td align="right" style="width: 30%" nowrap="nowrap">归档:</td>

  <td style="width: 15%"><asp:Label ID="lblCategory" runat="server" Text=""/></td>

  <td align="right" style="width: 25%" nowrap="nowrap">诉求提交时间:</td>

  <td style="width: 30%"><asp:Label ID="lblCreateTime" runat="server" Text="Label"/></td>

  </tr>

  <tr class="tdbg">

  <td align="right" style="width: 30%" nowrap="nowrap">诉求所在地域:</td>

  <td colspan="3"><asp:Label ID="lblRegion" runat="server" Text=""></asp:Label></td>

  </tr>

  <tr class="tdbg">

  <td colspan="4"><asp:Label ID="Label2" runat="server" Text=""/></td>

  </tr>

  <tr class="tdbg">

  <td colspan="4" align="left" valign="top" nowrap="nowrap">诉求内容:</td>

  </tr>

  <tr class="tdbg">

  <td colspan="4" align="left" valign="top">

  <pe:ExtendedLiteral ID="LtrEditContent" runat="server" HtmlEncode="false"/>

  </td>

  </tr>

  </tbody>

  </table>

  </td>

  </tr>

  </tbody>

  </table>

  <!--endprint-->

  <br />

  <div id="divBtnPrint" style="text-align:center">

  <input id="BtnPrint" type="button" value="打 印…" onclick="doPrint();" />

  </div>

  <br />

  <script type="text/javascript">

  <!--

  function doPrint(){

  bdhtml = window.document.body.innerHTML;

  sprnstr = "<!--startprint-->";

  eprnstr = "<!--endprint-->";

  prnhtml = bdhtml.substr(bdhtml.indexOf(sprnstr) + 17);

  prnhtml = prnhtml.substring(0, prnhtml.indexOf(eprnstr));

  window.document.body.innerHTML =  prnhtml;

  var obj = window.document.body;

  doZoom(obj, 18); //放大打印

  window.print();

  }

  function doZoom(artibody, size) {

  if (!artibody)

  {

  return;

  }

  setChildNodesByCurrentNode(artibody,size);

  }

  function setChildNodesByCurrentNode(node,size) {

  for(var i=0; i < node.childNodes.length; i++) {

  var artibodyChild = node.childNodes[i];

  if (artibodyChild.nodeType == 1) {

  artibodyChild.className="";

  artibodyChild.style.fontSize = size + 'px';

  artibodyChild.style.fontFamily = '仿宋_GB2312,宋体,"Times New Roman",Georgia,serif';

  artibodyChild.style.fontWeight = 900;

  if(artibodyChild.childNodes.length>0) {

  setChildNodesByCurrentNode(artibodyChild,size);

  }

  }

  }

  }

  -->

  </script>

  </asp:Content>

  观察上面代码可以看出,打印时,window.document.body.innerHTML 被重新赋值成设定需要打印的网页部分的代码(这里是 prnhtml),然后通过递归方式调用setChildNodesByCurrentNode(artibody,size)更改相关子节点的样式,以达到全部更换相关字体大小及样式设置的目的。