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<iframe name="down1" runat="server" width="240" height="700" style="background-color:White" src="level_dz.aspx" border=0 frameborder=0 framespacing=0 marginheight=0 marginwidth=0 noResize scrolling=yes vspace="0"></iframe>
function GetValue()
{
var hf=document.getElementById("lbl_tree_id").innerText;
var temp1 = window.parent.document.getElementById("TextBox1");
temp1.value = hf;
}
<form id="frm_tv" runat="server">
<div style="text-align:left">
<asp:TreeView runat="server" ID="TreeView1" ExpandDepth="0" ShowLines="True" ExpandImageToolTip="" OnSelectedNodeChanged="TreeView1_SelectedNodeChanged"></asp:TreeView></div>
<asp:Label ID="lbl_tree_id" Visible=false runat="server"></asp:Label>
</form>
protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{
this.lbl_tree_id.Text = TreeView1.SelectedValue.ToString();
fz();
}
private void fz()
{
Page.RegisterStartupScript("g", "<script>GetValue();</script>");
}
<table border="0" align="center" bordercolor="e9e9e9" bgcolor=#FFFFFF width="100%" cellPadding="0" cellSpacing="0">
<tr><td valign=top align=center><font color=red><b>请先选择</b></font><br>
<iframe name="down1" runat="server" width="240" height="700" style="background-color:White" src="level_dz.aspx" border=0 frameborder=0 framespacing=0 marginheight=0 marginwidth=0 noResize scrolling=yes vspace="0"></iframe></td>
<td><asp:Button id="Button2" runat="server" Text="Test" OnClick="test_Click" BorderStyle="None"></asp:Button></td>
protected void test_Click(object sender, System.EventArgs e)
{
.....//这里怎么写?
}