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问题描述
In my application i have two drop downs the problem is on changing the drop down selection i am loads multiple grids in a tree structure, but loading these grids takes little longer time it nearly takes 5 min to load all the grids to avoid this i am showing the loading progress and below is the code that i have used
aspx code
<form>
<img style="visibility:hidden;" src="~/Image/loader.gif" runat="server" id="loading_image" />
<asp:DropDownList ID="ddl1" runat="server" Height="22px" Width="121px" OnSelectedIndexChanged="ddlYear_SelectedIndexChanged" AutoPostBack="True">
</asp:DropDownList>
<asp:DropDownList ID="ddl2" runat="server" Height="22px" Width="121px" OnSelectedIndexChanged="ddlYear_SelectedIndexChanged" AutoPostBack="True">
</asp:DropDownList>
</form>
.cs code
protected void Page_Load(object sender, EventArgs e)
{
ddlYear.Attributes.Add("onchange", "document.getElementById(\"loading_image\").style.visibility = \"visible\";");
}
protected void ddl1_SelectedIndexChanged(object sender, EventArgs e)
{
i = 0;
imgid.Visible = true;
imgid1.Visible = true;
imgid2.Visible = true;
imgid3.Visible = true;
imgid4.Visible = true;
imgid5.Visible = true;
imgid6.Visible = true;
lbl1.Visible = true;
lbl2.Visible = true;
lbl3.Visible = true;
lbl4.Visible = true;
lbl5.Visible = true;
lbl6 = true;
if (ddl1.SelectedItem.Text != "Select")
{
lbl2.Text = ddlYear.SelectedItem.Text;
DataBind(Session["abc"].ToString(), ddl1.SelectedItem.Text, Session["name"].ToString());
Bind(Session["dept"].ToString(), ddl1.SelectedItem.Text, Session["name"].ToString());
}
else
{
}
}
protected void ddl2_SelectedIndexChanged(object sender, EventArgs e)
{
i = 0;
imgid.Visible = true;
imgid1.Visible = true;
imgid2.Visible = true;
imgid3.Visible = true;
imgid4.Visible = true;
imgid5.Visible = true;
imgid6.Visible = true;
lbl1.Visible = true;
lbl2.Visible = true;
lbl3.Visible = true;
lbl4.Visible = true;
lbl5.Visible = true;
lbl6 = true;
if (ddl1.SelectedItem.Text != "Select")
{
lbl2.Text = ddlYear.SelectedItem.Text;
DataBind(Session["abc"].ToString(), ddl1.SelectedItem.Text, Session["name"].ToString());
Bind(Session["dept"].ToString(), ddl1.SelectedItem.Text, Session["name"].ToString());
}
else
{
}
}
the problem with above code is the loading progress is always getting displayed even after the grids are loaded but i need to display the loading progress only for the time when grids are getting loaded and once if grids loaded this loading progress should not appear how can i do this
我尝试过：
i尝试了上面的代码，但它没有工作
What I have tried:
i tried above code but its not working
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