This is a migrated thread and some comments may be shown as answers.

Need help to re-load data after postback

1 Answer 182 Views

ComboBox

This is a migrated thread and some comments may be shown as answers.

Helen asked on 09 Oct 2014, 06:13 PM

combobox_postback.png

Hi,I have created a button to simulate clicking the arrow on a combobox.
Basically I hide the combobox and call the javascript to triggers the dropdown behavior of the combobox when a user clicks on the button.
The user will be able to select an item from the dropdown and then the code-behind will populate the selected address into the textboxes accordingly.Everything works ok up to this point. The problem starts after the postback, data in the dropdown list is gone.
I found a few posts on the forum which says we need to load the data on each post back or in the ItemsRequested event but that didn't work for me.
I must be missing something obvious, but just can't spot it. Please help~

javascript :
Since the combobox is in a user control, I load the javascript using ScriptManager.

code-behind:

protected void Page_Load(object sender, EventArgs e)

{

// Load script dynamically for user control

//  Refer to : http://www.telerik.com/forums/javascript-not-loaded-when-loading-user-control-dynamically-in-an-ajax-request

StringBuilder script = new StringBuilder();

script.Append("function ShowDropDownFunction() {");

script.Append("var combo = $find('" + RadLogixBuildingComboBox.ClientID + "');");

script.Append("combo.showDropDown(); }");

ScriptManager.RegisterStartupScript(Page, typeof(Page), "script1", script.ToString(), true);

SALTLeadDetailsBLL _detailBLL = new SALTLeadDetailsBLL();

SALTLeadDetailsDAL.sbms_bldgDataTable dt = _detailBLL.GetLogixBuildings(SalesID);

RadLogixBuildingComboBox.DataSource = dt;

RadLogixBuildingComboBox.DataBind();

}

protected void RadLogixBuildingComboBox_ItemDataBound(object sender, RadComboBoxItemEventArgs e)

{

DataRowView dataItem = (DataRowView)e.Item.DataItem;

e.Item.Text = dataItem["bldgstreet1"].ToString().Trim() + "; " + dataItem["bldgcity"].ToString().Trim() + "; " + dataItem["bldgstate"].ToString().Trim() + "; " + dataItem["bldgzip"].ToString().Trim() + "; " + dataItem["market"].ToString().Trim();

e.Item.Value = dataItem["bldgstreet1"].ToString().Trim() + "; " + dataItem["bldgcity"].ToString().Trim() + "; " + dataItem["bldgstate"].ToString().Trim() + "; " + dataItem["bldgzip"].ToString().Trim() + "; " + dataItem["market"].ToString().Trim();

}

protected void RadLogixBuildingComboBox_SelectedIndexChanged(object sender, RadComboBoxSelectedIndexChangedEventArgs e)

{

//  When loadondemand is turned on, SelectedItem is not available : http://www.telerik.com/forums/combobox-selecteditem-getting-null-even-when-it-is-selected-from-the-list

// Use e.item.text and e.item.value in ItemDataBound event

String selectedItemValues = RadLogixBuildingComboBox.SelectedValue;

List<string> itemValues = selectedItemValues.Split(';').ToList();

string[] zipCode = itemValues[3].Trim().Split('-');

string zip = zipCode[0].ToString().Trim();

string zipExt = zipCode[1].ToString().Trim();

Address1TextBox.Text = itemValues[0].ToString().Trim();

CityTextBox.Text = itemValues[1].ToString().Trim();

StateTextBox.Text = itemValues[2].ToString().Trim();

ZipTextBox.Text = zip;

ZipExtTextBox.Text = zipExt;

RadMarketComboBox.SelectedValue = itemValues[4].ToString().Trim();

}

protected void RadLogixBuildingComboBox_ItemsRequested(object sender, RadComboBoxItemsRequestedEventArgs e)

{

SALTLeadDetailsBLL _detailBLL = new SALTLeadDetailsBLL();

SALTLeadDetailsDAL.sbms_bldgDataTable dt = _detailBLL.GetLogixBuildings(SalesID);

RadLogixBuildingComboBox.DataSource = dt;

RadLogixBuildingComboBox.DataBind();

}

ascx :

<telerik:RadButton ID="LogixBuildingImageButton" AutoPostBack="false" runat="server" Image-ImageUrl="~/images/building16.png" ToolTip="Logix Buildings" Width="16px" Height="16px" OnClientClicked="ShowDropDownFunction" />

<telerik:RadComboBox ID="RadLogixBuildingComboBox" runat="server" AutoPostBack="true" MarkFirstMatch="false" ItemsPerRequest="5" ShowMoreResultsBox="true"

EnableAutomaticLoadOnDemand="true" EnableVirtualScrolling="true"

DropDownAutoWidth="Disabled" DropDownWidth="700px" Width="0" Height="150px" HighlightTemplatedItems="true" EnableScreenBoundaryDetection="true"

OnItemDataBound="RadLogixBuildingComboBox_ItemDataBound" OnSelectedIndexChanged="RadLogixBuildingComboBox_SelectedIndexChanged" OnItemsRequested="RadLogixBuildingComboBox_ItemsRequested" >

<HeaderTemplate>

<table>

<tr>

<td class="logixbuildingcol1">Building Street</td>

<td class="logixbuildingcol2">City</td>

<td class="logixbuildingcol3">State</td>

<td class="logixbuildingcol4">Zip</td>

<td class="logixbuildingcol5">Status</td>

<td class="logixbuildingcol6">Address Type</td>

</tr>

</table>

</HeaderTemplate>

<ItemTemplate>

<table>

<tr>

<td class="logixbuildingcol1"><%# DataBinder.Eval(Container.DataItem, "bldgstreet1") %> </td>

<td class="logixbuildingcol2"><%# DataBinder.Eval(Container.DataItem, "bldgcity") %></td>

<td class="logixbuildingcol3"><%# DataBinder.Eval(Container.DataItem, "bldgstate") %></td>

<td class="logixbuildingcol4"><%# DataBinder.Eval(Container.DataItem, "bldgzip") %></td>

<td class="logixbuildingcol5"><%# DataBinder.Eval(Container.DataItem, "buildingStatus") %></td>

<td class="logixbuildingcol6"><%# DataBinder.Eval(Container.DataItem, "addressTypeDesc") %></td>

</tr>

</table>

</ItemTemplate>

<FooterTemplate>

<table>

<tr>

<td class="logixbuildingcol1"><telerik:RadButton ID="RadCloseButton" runat="server" AutoPostBack="false" Text="Close" Icon-PrimaryIconUrl="~/images/exit_16x16.png" OnClientClicking="HideDropDownFunction()" /></td>

</tr>

</table>

</FooterTemplate>

</telerik:RadComboBox>

Thank you,

Helen

Need help to re-load data after postback

1 Answer, 1 is accepted