How do I open DropDown of RadComboBox on asp Button click?

Question

How do I open DropDown of RadComboBox on asp:Button click? Both RadComboBox and Button are inside EditItemTemplate of RadGrid.

My requirement is: I had to open DropDown of RadComboBox ("ddlAccountCode" in below HTML code) on a click of button ("btnSearch" in below HTML code).

Below is the HTML code of RadComboBox and Button

    <telerik:GridTemplateColumn UniqueName="AccountCode" HeaderText="Account Code">
        <ItemTemplate>
             <asp:Label ID="lblAcCode" runat="server" Text='<%# Eval("AccountCode")%>'></asp:Label>
        </ItemTemplate>
        <EditItemTemplate>
             <asp:Label ID="lblAcCode2" runat="server" Text='<%# Eval("AccountCode") + " - " + Eval("AccountDescription")%>' Visible="false"></asp:Label>
             <telerik:RadComboBox ID="ddlAccountCode" runat="server" Height="200" Width="240" DropDownWidth="310" HighlightTemplatedItems="true" CausesValidation="true" 
OnItemsRequested="ddlAccountCode_ItemsRequested" EnableItemCaching="true" ShowDropDownOnTextboxClick="false" EnableLoadOnDemand="True" ShowMoreResultsBox="true" EnableVirtualScrolling="true" MarkFirstMatch="True" AllowCustomText="true"
Filter="Contains" AppendDataBoundItems="true" DataTextField="AccountDescription" DataValueField="AccountCodeID" AutoPostBack="true" OnSelectedIndexChanged="ddlAccountCode_SelectedIndexChanged">
             </telerik:RadComboBox>                            
             <telerik:RadButton id="btnSearch" runat="server" text="Search" OnClick="btnSearch_Click">
             </telerik:RadButton>
          </EditItemTemplate>
    </telerik:GridTemplateColumn>

I am doing searching/filtering in RadComboBox on a button click. All is working fine except when I type/search anything in textbox of RadComboBox and click on button to search, the dropdown of RadCombo does not open up. Due to this, every time, I have to manually open the dropdown to see the result of searched text in RadComboBox.

I am stuck in it since 3 days. I am in urgent need of the solution regarding the same. Please reply to my posted question. — timz_123, Sep 04 '15 at 02:14
Feel free to [start a bounty](http://stackoverflow.com/help/bounty) to draw attention to your question. — Michael Liu, Sep 04 '15 at 02:54

score 1 · Accepted Answer · answered Sep 07 '15 at 02:09

1

Below line of code is working fine for my requirement:

protected void btnSearch_Click(object sender, EventArgs e)
    {
        GridEditableItem editedItem = (sender as Button).NamingContainer as GridEditableItem;
        RadComboBox combo = (RadComboBox)editedItem.FindControl("ddlAccountCode");
        combo.OpenDropDownOnLoad = true; // opens dropdown of RadComboBox
    }

answered Sep 07 '15 at 02:09

timz_123

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You could also do that on the client-side, without a postback, only with a bit of JavaScript. – rdmptn Sep 08 '15 at 12:30
@rdmptn: Thank you for the reply. But since I have to do searching on `OnClick` event of button, so only I am implementing it on button click. – timz_123 Sep 09 '15 at 04:01
I thought so, but I just wanted to leave the note here if you are interested :) – rdmptn Sep 09 '15 at 05:45
@rdmptn: Thank you for that. Could be useful in future :) – timz_123 Sep 09 '15 at 05:53

How do I open DropDown of RadComboBox on asp Button click?

1 Answers1