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RadWindow closes after DropDownListBox postback

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Window

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answered on 27 May 2016, 08:33 AM

Hi Rodney,

The most likely reason for such behavior is that the RadWindow itself is included in the partial page rendering and gets disposed: http://docs.telerik.com/devtools/aspnet-ajax/controls/window/how-to/how-to-use-radwindow-with-ajax. As the article explains, make sure the RadWindow itself does not get disposed, only the UpdatePanel inside its ContentTemplate should be part of the server response (and/or any other parts of the page that do not include the RadWIndow).

Another option is to register a script call that will show the RadWindow after the postback from the SelectedIndexChanged event: http://docs.telerik.com/devtools/aspnet-ajax/controls/window/troubleshooting/opening-from-the-server.

Regards,

Marin Bratanov
Telerik

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answered on 27 May 2016, 12:04 PM

Great,

I was unable to get the first solution to work but was able to get it to work by reposting the RadWindow in the SelectedIndexChange event. But that has introduced a second problem.

One of the objects on the radWindow is a RadAsyncUpload control. If I select the filename first, when I redisplay the window it has lost the file that was selected. Interestingly none of the other text or date fields on the page have this problem, they all retain their values.

Any help would be appreciated. I'm going to post the whole RadWindow below which is rather lengthy, but maybe you will see something I'm missing.

<telerik:RadWindow RenderMode="Classic" runat="server" ID="rwDetailHeaderAttachment" Modal="true" Behaviors="Close, Move"

Title="Add Attachment" Skin="Telerik" EnableShadow="true" Width="650px" Height="465px">

<ContentTemplate>

<asp:UpdatePanel ID="updAttachment" runat="server" UpdateMode="Conditional">

<ContentTemplate>

<asp:HiddenField ID="hdnPopupMode" runat="server" Value="ADD" />

<div class="contentPadding">

<div class="formRow" id="divAttachFile" runat="server" style="height: 60px; margin: 20px 0 20px 0;">

<div class="floatLeft">

<label for="asyncFlUpldAttachment"><span id="spnUploadFileMark" runat="server" class="validator">*</span> Upload File: </label>

<telerik:RadAsyncUpload ID="RadAsyncUpload1" runat="server" MaxFileSize='<%$ AppSettings:MAXATTCHFILESIZE %>'

MultipleFileSelection="Disabled" MaxFileInputsCount="1" AllowedFileExtensions='<%$ AppSettings:ATTCHFILEEXTNS %>'

EnableInlineProgress="true" TemporaryFileExpiration="36000"

OnClientValidationFailed="validationFailed"

OnClientFileUploading="fileUploading"

OnClientFileUploadFailed="fileUploadFailed">

</telerik:RadAsyncUpload>

<span id="ErrorHolder" style="display: none" class="validator"></span>

<asp:CustomValidator ID="asyncFlUpldAttachmentValidator" runat="server" CssClass="validator" Text="Required" ErrorMessage="File is a Required Field"

OnServerValidate="asyncFlUpldAttachmentValidator_Validate" ValidationGroup="attachmentValidations">

</asp:CustomValidator>

</div>

<div class="formRow" style="margin-bottom: 8px;">

<div class="floatLeft">

<label for="lblAttachFileName"><span id="spnFileNameMark" runat="server" class="validator">*</span> File Name:</label>

<asp:TextBox ID="txtBxAttachFileName" runat="server" />

<asp:Label ID="lblAttachFileName" runat="server" Width="300" />

<asp:RequiredFieldValidator ID="txtBxAttachFileName_ReqFieldValidator" runat="server" CssClass="validator"

Text="Required" ErrorMessage="File Name is a Required Field" ControlToValidate="txtBxAttachFileName" EnableClientScript="true"

ValidationGroup="attachmentValidations">

</asp:RequiredFieldValidator>

</div>

<div class="formRow" style="margin-bottom: 8px;">

<div class="floatLeft">

<label for="lblAttachDocType"><span id="spnDocumentTypeMark" runat="server" class="validator">*</span> Document Type:</label>

<asp:DropDownList ID="ddlAttachDocType" runat="server" CausesValidation="false" DataTextField="LookUpTypeDescription"

DataValueField="LookUpTypeValue" Width="300" OnSelectedIndexChanged="ddlAttachDocType_SelectedIndexChanged" AutoPostBack="true" />

<asp:RequiredFieldValidator ID="ddlAttachDocType_RequiredFieldValidator" runat="server" CssClass="validator"

Text="Required" ErrorMessage="Document Type is a Required Field" ControlToValidate="ddlAttachDocType" EnableClientScript="true"

Display="Dynamic"

ValidationGroup="attachmentValidations">

</asp:RequiredFieldValidator>

<asp:Label ID="lblAttachDocType" runat="server" Width="300" />

</div>

<div class="formRow" id="spnPubCode" runat="server" style="display: none; margin-bottom: 8px;">

<div class="floatLeft">

<label for="lblAttachPublicationCode"><span class="validator">*</span> Publication Code:</label>

<asp:DropDownList ID="ddlAttachPublicationCode" runat="server" DataTextField="LookUpTypeDescription"

DataValueField="LookUpTypeValue" />

<asp:Label ID="lblAttachPublicationCode" runat="server" />

</div>

<div class="formRow" id="spnPubName" runat="server" style="display: none; margin-bottom: 8px;">

<div class="floatLeft">

<label for="lblAttachPublicationName"><span class="validator">*</span> Publication Name:</label>

<asp:TextBox ID="txtPublicationName" runat="server" MaxLength="200" />

<asp:CustomValidator ID="txtPublicationName_CustomValidator" runat="server" CssClass="validator" Text="Required" ErrorMessage="Publication Name is a Required Field"

OnServerValidate="txtPublicationName_CustomValidator_Validate" Display="Dynamic"

ClientValidationFunction="validatePublicationName" ValidationGroup="attachmentValidations">

</asp:CustomValidator>

<asp:Label ID="lblAttachPublicationName" runat="server" />

</div>

<div class="formRow" id="spnPubDispo" runat="server" style="display: none; margin-bottom: 8px;">

<div class="floatLeft">

<label for="lblAttachDisposition"><span class="validator">*</span> Disposition:</label>

<asp:DropDownList ID="ddlAttachDisposition" runat="server" DataTextField="LookUpTypeDescription"

DataValueField="LookUpTypeValue" />

<asp:Label ID="lblAttachDisposition" runat="server" />

</div>

<div class="formRow" style="margin-bottom: 8px;">

<div class="floatLeft">

<label for="lblAttachDocumentDate">Document Date:</label>

<telerik:RadDatePicker runat="server" ID="rdpAttachDocumentDate" ZIndex="100000">

<DateInput runat="server" DateFormat="dd MMM yyyy" DisplayDateFormat="dd MMM yyyy" EmptyMessage="DD MMM YYYY" />

<Calendar ID="Calendar1" runat="server" ShowRowHeaders="false">

<SpecialDays>

<telerik:RadCalendarDay Repeatable="Today" Date="" IsToday="true">

<ItemStyle CssClass="rcToday" />

</telerik:RadCalendarDay>

</SpecialDays>

</Calendar>

</telerik:RadDatePicker>

<asp:Label ID="lblAttachDocumentDate" runat="server" />

</div>

<div class="formRow" style="margin-bottom: 15px;">

<label for="txtAttachmentComments">Comments:</label>

<div style="width:100%">

<telerik:RadEditor ID="txtBxAttachmentComments" runat="server" EditModes="Design"

MaxTextLength="4000" SkinID="DefaultSetOfTools" ContentAreaMode="Div" OnClientInit="CharCountInit"

Height="140px" Width="65%" Style="background-color: White; display: inline-block;"

Skin="Default" Visible="true" TabIndex="170">

<Tools>

<telerik:EditorToolGroup>

<telerik:EditorTool Name="AjaxSpellCheck" />

<telerik:EditorSeparator />

<telerik:EditorTool Name="Cut" />

<telerik:EditorTool Name="Copy" />

<telerik:EditorTool Name="Paste" />

</telerik:EditorToolGroup>

</Tools>

<Modules>

<telerik:EditorModule Name="RadEditorStatistics" Visible="true" Enabled="true"></telerik:EditorModule>

</Modules>

</telerik:RadEditor>

</div>

<div class="formRow">

<div class="floatRight">

<asp:LinkButton ID="lnkBtnSaveAttachment" runat="server" OnClick="lnkBtnSaveAttachment_Click" CssClass="silverButton" CausesValidation="true"> <span>Submit</span></asp:LinkButton>

<asp:LinkButton ID="lnkBtnAttachmentCancel" runat="server" CausesValidation="false" Text="Cancel" CssClass="floatRightLink" OnClick="lnkBtnAttachmentCancel_Click" />

</div>

<div class="formRowNoBorder" style="margin-top: 8px;">

<div class="floatLeft">

<asp:Label ID="errorMessage" runat="server" Visible="false" CssClass="validator" />

</div>

</ContentTemplate>

</asp:UpdatePanel>

</ContentTemplate>

</telerik:RadWindow>

answered on 27 May 2016, 12:52 PM

Hello Rodney,

The AJAX setup issue is likely to be outside of the RadWindow, it may even be as high as the master page level.

What I would first suggest is that you reconsider whether you need to use the ContentTemplate. If you load an entire ASPX page in the RadWindow it will be loaded in an iframe and will be able to operate independently from the main page. If you need it to talk to the main page, call a JS function as shown here.

As for the AsyncUpload, I suggest you try using the PostbackTriggers property so it retains the files, as explained in the documentation: http://docs.telerik.com/devtools/aspnet-ajax/controls/asyncupload/how-to/how-to-persist-uploaded-files.

Regards,

Marin Bratanov
Telerik

Do you need help with upgrading your ASP.NET AJAX, WPF or WinForms projects? Check the Telerik API Analyzer and share your thoughts.