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出现 “__doPostBack”未定义”

2024-08-07 15:50:16   219人阅读

最近我们运营的网站有用户反馈在 IE 11 下<asp:LinkButton> 点击出现 “__doPostBack”未定义”，经过一番google,终于知道了原因：ASP.NET 可能无法辨识出一些浏览器的最新版本，还会经常把它们看做是低级的浏览器。（也就是： 不支持JavaScript。）
详见： http://blogs.msdn.com/b/scott_hanselman/archive/2011/10/28/asp-net-ie10-dopostback-javascript-ff5.aspx
本人按照该文所提供的解决办法始终未能得到解决，于是按提示尝试用单个站点的方式修复。
在项目根目录 App_Browsers 下新建 浏览器文件(.browser)，让其与IE11的 UserAgent 匹配，使 .net framework 认识这是一个已知的浏览器，可以正常地向客户端输出脚本。
在文件里输入以下内容，保存即可。

 

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<browsers>
  <browser id="IE11" parentID="Mozilla">
    <identification>
      <userAgent match="Trident\/7.0; rv:(?‘version‘(?‘major‘\d+)(\.(?‘minor‘\d+)?)(?‘letters‘\w*))(?‘extra‘[^)]*)" />
      <userAgent nonMatch="IEMobile" />
    </identification>
    <capture>
      <userAgent match="Trident/(?‘layoutVersion‘\d+)" />
    </capture>
    <capabilities>
      <capability name="browser"              value=http://www.mamicode.com/"IE" />
      <capability name="layoutEngine"         value=http://www.mamicode.com/"Trident" />
      <capability name="layoutEngineVersion"  value=http://www.mamicode.com/"${layoutVersion}" />
      <capability name="extra"                value=http://www.mamicode.com/"${extra}" />
      <capability name="isColor"              value=http://www.mamicode.com/"true" />
      <capability name="letters"              value=http://www.mamicode.com/"${letters}" />
      <capability name="majorversion"         value=http://www.mamicode.com/"${major}" />
      <capability name="minorversion"         value=http://www.mamicode.com/"${minor}" />
      <capability name="screenBitDepth"       value=http://www.mamicode.com/"8" />
      <capability name="type"                 value=http://www.mamicode.com/"IE${major}" />
      <capability name="version"              value=http://www.mamicode.com/"${version}" />
    </capabilities>
  </browser>
 
  <!-- Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11,0) like Gecko -->
  <browser id="IE110" parentID="IE11">
    <identification>
      <capability name="majorversion" match="11" />
    </identification>
 
    <capabilities>
      <capability name="ecmascriptversion"    value=http://www.mamicode.com/"3.0" />
      <capability name="jscriptversion"       value=http://www.mamicode.com/"5.6" />
      <capability name="javascript"           value=http://www.mamicode.com/"true" />
      <capability name="javascriptversion"    value=http://www.mamicode.com/"1.5" />
      <capability name="msdomversion"         value=http://www.mamicode.com/"${majorversion}.${minorversion}" />
      <capability name="w3cdomversion"        value=http://www.mamicode.com/"1.0" />
      <capability name="ExchangeOmaSupported" value=http://www.mamicode.com/"true" />
      <capability name="activexcontrols"      value=http://www.mamicode.com/"true" />
      <capability name="backgroundsounds"     value=http://www.mamicode.com/"true" />
      <capability name="cookies"              value=http://www.mamicode.com/"true" />
      <capability name="frames"               value=http://www.mamicode.com/"true" />
      <capability name="javaapplets"          value=http://www.mamicode.com/"true" />
      <capability name="supportsCallback"     value=http://www.mamicode.com/"true" />
      <capability name="supportsFileUpload"   value=http://www.mamicode.com/"true" />
      <capability name="supportsMultilineTextBoxDisplay" value=http://www.mamicode.com/"true" />
      <capability name="supportsMaintainScrollPositionOnPostback" value=http://www.mamicode.com/"true" />
      <capability name="supportsVCard"        value=http://www.mamicode.com/"true" />
      <capability name="supportsXmlHttp"      value=http://www.mamicode.com/"true" />
      <capability name="tables"               value=http://www.mamicode.com/"true" />
      <capability name="supportsAccessKeyAttribute"    value=http://www.mamicode.com/"true" />
      <capability name="tagwriter"            value=http://www.mamicode.com/"System.Web.UI.HtmlTextWriter" />
      <capability name="vbscript"             value=http://www.mamicode.com/"true" />
    </capabilities>
  </browser>
</browsers>

出现 “__doPostBack”未定义”


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