Tag: updatepanel

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Asp.net ItemCommand asynchronous postback in an UpdatePanel

In Asp.net Simply adding an UpdatePanel to a ListView with an ItemCommand won’t do the trick of asynchronous postback. The Command should be registered to the script manager Dynamically.

To achieve an asynchronous postback you have to do the following trick

Asp.net front end Code Example

<asp:UpdatePanel runat=”server” ID=”upContent”>
<ContentTemplate>
<asp:ListView runat=”server” ID=”lvContent”
OnItemCommand=”lvContent_ItemCommand”
onitemdatabound=”lvContent_ItemDataBound” >
<ItemTemplate>
<div class=”trd-block”>
<asp:LinkButton Text=”Delete” runat=”server” ID=”lnkDelete” CommandArgument='<%#Eval(“ID”) %>’  />
</div>
</ItemTemplate>
</asp:ListView>
</ContentTemplate>
</asp:UpdatePanel>

The solution comes in the Code Behind C# on the ItemDataBound

protected void lvContent_ItemDataBound(object sender, ListViewItemEventArgs e)
{
LinkButton delete = (LinkButton)e.Item.FindControl(“lnkDelete”);
ScriptManager.GetCurrent(this.Page).RegisterAsyncPostBackControl(delete);
}

 

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RegisterStartupScript with asp:updatepanel

Using Asp.net if you want to add a script to the page from the code behind. The normal Page.RegisterStartupScript will not work if it is called from a button (or any other event) inside an updatePanel.

This is the normal code you would use ( this will work normally if you don’t have an updatePanel)

Page.RegisterStartupScript(“popup”, “<script type=’text/javascript’>alert(‘hello world’);</script>”);

It should be replaced with the following line of code

ScriptManager.RegisterStartupScript(PanelID, PanelID.GetType(), “script key”, “alert(‘hello world’);”, true);

or use it like this same result

ScriptManager.RegisterStartupScript(PanelID, PanelID.GetType(), “script key”, “<script type=’text/javascript’>alert(‘hello world’);</script>”, false);

Hope this was helpful and solved your problem