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asp.net中的“按需打印”(打印你需要打印的部分) 實(shí)現(xiàn)代碼

 更新時間:2013年06月07日 12:02:55   作者:  
有時我們需要對asp.net網(wǎng)頁中某些特定部分進(jìn)行打印,很多人采用CSS樣式或特定的打印控件來解決網(wǎng)頁定制打印功能。這里采用Javascript樣式替換方式進(jìn)行打印,使網(wǎng)頁顯示與打印效果相分離。

過程很簡單:

首先在asp.net頁面中設(shè)定開始打印和結(jié)束打印的標(biāo)記,為了確保該標(biāo)記不在網(wǎng)頁瀏覽時顯示,我們采用"<!-- HTML注釋 -->"的方式。比如:<!--startprint-->和<!--endprint-->。

接著寫相關(guān)的JavaScript代碼,具體代碼見后。

如果不想打印按鈕也被打印出來,注意將打印按鈕包含在<!--startprint-->和<!--endprint-->之外。

相關(guān)代碼:

復(fù)制代碼 代碼如下:

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

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

<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>訴 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">訴求主題:</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">訴求類型:</td>
                        <td  colspan="3">
                              <asp:Label ID="lblAppealCategory" runat="server" Text=""/>
                        </td>
                    </tr>
                    <tr class="tdbg">
                        <td align="right" width="30%" nowrap="nowrap">訴求當(dāng)前狀態(tài):</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">訴求性質(zhì):</td>
                        <td style="width: 15%"><asp:Label ID="lblAppealNature" runat="server" Text="Label"/></td>
                        <td align="right" style="width: 25%" nowrap="nowrap">被投訴人姓名:</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">被投訴人地址:</td>
                        <td style="width: 15%"><asp:Label ID="lblBeAppealAddress" runat="server" Text="Label"/></td>
                        <td align="right" style="width: 25%" nowrap="nowrap">投訴人:</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">訴求信息是否保密:</td>
                        <td style="width: 15%"><asp:Label ID="lblIsSecret" runat="server" Text="Label"/></td>
                        <td align="right" style="width: 25%" nowrap="nowrap">管理員是否同意公開:</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">瀏覽數(shù):</td>
                        <td style="width: 15%"><asp:Label ID="lblHits" runat="server" Text="Label"/></td>
                        <td align="right" style="width: 25%" nowrap="nowrap">回復(fù)數(shù):</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">歸檔:</td>
                        <td style="width: 15%"><asp:Label ID="lblCategory" runat="server" Text=""/></td>
                        <td align="right" style="width: 25%" nowrap="nowrap">訴求提交時間:</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">訴求所在地域:</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">訴求內(nèi)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,宋體,"Times New Roman",Georgia,serif';
                artibodyChild.style.fontWeight = 900;
                if(artibodyChild.childNodes.length>0) {
                    setChildNodesByCurrentNode(artibodyChild,size);
                }
            }
         }
      }

-->

 </script>
</asp:Content>


觀察上面代碼可以看出,打印時,window.document.body.innerHTML 被重新賦值成設(shè)定需要打印的網(wǎng)頁部分的代碼(這里是 prnhtml),然后通過遞歸方式調(diào)用setChildNodesByCurrentNode(artibody,size)更改相關(guān)子節(jié)點(diǎn)的樣式,以達(dá)到全部更換相關(guān)字體大小及樣式設(shè)置的目的。

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