在我的网站我有两个页面内一个asp.net页面...一个是Assistance.aspx
,另一个是Help01.aspx
我想要做的就是打开里面的iFrame
第二页这是在此列属于表这是Assistance.aspx
页的内表列:
为此我使用下面的代码:
打开一个iframe
<iframe id="iFrame" runat="server" class="tablecolumndiv" >
在我后面的代码我使用:
Protected WithEvents iFrame As System.Web.UI.HtmlControls.HtmlGenericControl<br/>
Public frame1 As HtmlControl = CType(Me.FindControl("iFrame"), HtmlControl)
但是,当我来到了:
Private Sub button1_Click(sender As Object, e As System.EventArgs) Handles button1.Click
frame1.Attributes("src") = "/Pages/Support/Asp/Help01.aspx"
End Sub
这引发了我的错误:
Object reference not set to an instance of an object.
因为Me.FindControl("iFrame")
有什么
值 当我删除消除了错误runat
来自元素。 为什么?
*其它信息*
我也用下面的脚本出于同样的原因:
<script type="text/javascript">
function setPage(frame, pName) {
document.getElementById(frame).src = pName;
}
</script>
我称之为从我后面的代码:
Private Sub button1_Click(sender As Object, e As System.EventArgs) Handles button1.Click
Dim myNewAsp As New AspNetSqlProvider
myNewAsp.InitializeSite(sender, e)
Dim url As String = "/Pages/Support/Asp/Help01.aspx"
Dim urlURI As String = HttpContext.Current.Request.Url.AbsoluteUri
Dim urlPath As String = HttpContext.Current.Request.Url.AbsolutePath
Dim myServerName As String = Strings.Left(urlURI, urlURI.Length - urlPath.Length)
root_url = myServerName
Dim assist As New Assistance
Dim frameName As String = "iFrame" 'assistiFrame.ID
iPageLoad(frameName, sender, root_url + url)
End Sub
Public Sub iPageLoad(FrameId As String, sender As Object, msg As String)
Dim cstype As Type = Me.GetType()
Dim innerMess As String = msg
Dim url As String = HttpContext.Current.Request.Url.AbsoluteUri
Dim script As String = "setPage('" + FrameId + "', '" + innerMess + "')"
If Not Page.ClientScript.IsStartupScriptRegistered(Me.GetType(), "iPage") Then
Page.ClientScript.RegisterStartupScript(cstype, "iPage", script, True)
End If
End Sub
该脚本也引发了同样的错误。
当您删除runat = server标签时,我认为代码本身不起作用?你也关闭iframe标签吗? –
无代码运行顺利,我不关闭'iFrame' –
你有没有试过'iFrame.Attributes(“SRC”)=“/Pages/Support/Asp/Help01.aspx”'?直接,没有使用FindControl – Satpal