How to use WebNavBar | Infragistics Forums

1705

How to use WebNavBar

Ulises posted over 16 years ago

Hey guys,

I have a grid in a web user control that implements:

UltraWebGrid1.InitializeDataSource += new Infragistics.WebUI.UltraWebGrid.InitializeDataSourceEventHandler(UltraWebGrid1_InitializeDataSource);

UltraWebGrid1_InitializeDataSource queries the database, gets a datatable object and assigns it to the grid's datasource.

everything works fine.

However if I add the WebNavBar:

<ignavbar:webnavbar id="WebNavBar1" runat="server"              >
<Extension Visible="false" >
</Extension>
<Navigation Next-AutoPostBack="false" Prev-AutoPostBack= "false" End-AutoPostBack="false" Start-AutoPostBack="false" Rewind-AutoPostBack="false" FastForward-AutoPostBack="false" ></Navigation>
</ignavbar:webnavbar>

protected override void OnInit(EventArgs e)
{
    UltraWebGrid1.InitializeDataSource += new Infragistics.WebUI.UltraWebGrid.InitializeDataSourceEventHandler(UltraWebGrid1_InitializeDataSource);
    WebNavBar1.GridID = UltraWebGrid1.UniqueID;
}

and click Reverse or Forward I would get the following exception (all other buttons work just fine):

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the 
current web request. Information regarding the origin and location of the 
exception can be identified using the exception stack trace below.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
   Infragistics.WebUI.UltraWebGrid.RowsCollection.Infragistics.WebUI.UltraWebGrid.IXPathDataNavigable.GetFirstChild() +183
   Infragistics.WebUI.UltraWebGrid.RowsCollection.Infragistics.WebUI.UltraWebGrid.IXPathDataNavigable.get_HasChildren() +32
   Infragistics.WebUI.UltraWebGrid.XPathDataNavigator.OutputToStream(XPathDataNavigator xpdn, XmlTextWriter stream, HtmlTextWriter htmlWriter) +142
   Infragistics.WebUI.UltraWebGrid.RenderXmlGrid.WriteBody(HtmlTextWriter writer, RowsCollection rows, Boolean topLevel) +112
   Infragistics.WebUI.UltraWebGrid.RenderXmlGrid.WriteUltraWebGrid(HtmlTextWriter writer, UltraWebGrid grid, Boolean shouldWriteAll) +418
   Infragistics.WebUI.UltraWebGrid.RenderXmlGrid.VisitObjects(HtmlTextWriter output) +603
   Infragistics.WebUI.Shared.RendererBase.Render(HtmlTextWriter output) +36
   Infragistics.WebUI.UltraWebGrid.GridRendererBase.Render(HtmlTextWriter output) +482
   Infragistics.WebUI.UltraWebGrid.UltraWebGrid.Render(HtmlTextWriter output) +336
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +199
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20
   System.Web.UI.Control.Render(HtmlTextWriter writer) +7
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +199
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20
   System.Web.UI.Control.Render(HtmlTextWriter writer) +7
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +199
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20
   System.Web.UI.UpdatePanel.RenderChildren(HtmlTextWriter writer) +236
   System.Web.UI.Control.Render(HtmlTextWriter writer) +7
   System.Web.UI.UpdatePanel.Render(HtmlTextWriter writer) +32
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +199
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20
   System.Web.UI.Control.Render(HtmlTextWriter writer) +7
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +199
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +59
   System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +68
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +37
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +199
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20
   System.Web.UI.Control.Render(HtmlTextWriter writer) +7
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +199
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +20
   System.Web.UI.Page.Render(HtmlTextWriter writer) +26
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2558

Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433

I had a similar problem with another grid and I solved it reassigning the datasource to the grid on these events:

onaftermovenext="WebNavBar1_Move"
onaftermoveprev="WebNavBar1_Move"
onaftermovetoend="WebNavBar1_Move"
onaftermovetostart="WebNavBar1_Move"

I haven't had the same luck with this grid.

Can somebody help please?

Thanks !

1705

Verified Answer
Ulises posted over 16 years ago in reply to Ulises

ureyes84 said:
changing the value of Browser from "Xml" to "Auto" will "fix" it. However, it makes the grid look weird the first time it loads

I noticed this keeps the app from crashing when clicking the WebNavBar, however, as stated above, the grid will render differently when the page is refreshed.

This is an email I got from Nick, which fixed my problem, so I hope this helps someone else.
--------------------------------------
Hm, this seems to be a bug in the Grid, here is an easy workaround:

     <igtbl:UltraWebGrid ID="UWGrdProjects" runat="server" Width="100%" Height="140px" Browser="Auto">

          <DisplayLayout LoadOnDemand="Xml" SelectTypeRowDefault="Single">



                <HeaderStyleDefault

                          CssClass=""

                          Font-Names="Verdana, Arial, Helvetica, sans-serif"

                          Font-Size="11px"

                          BackColor="#D4D7DB"

                          BackgroundImage="App_Themes/Default/Office2007Blue/WebGrid/igwgHeader.jpg">



                     <Padding Left="10px" Right="10px" />

                </HeaderStyleDefault>



                <Pager AllowPaging="true" PageSize="5" ></Pager>

          </DisplayLayout>

     </igtbl:UltraWebGrid>

The idea is to put a HeaderStyleDefault section below DisplayLayout and set its CssClass to Empty, then set Font, BackGround, Padding etc. however you like.

--------------------------------------

thanks Nick.
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1705

Ulises posted over 16 years ago in reply to Ulises

The page where my grid is contains multiple UpdatePanel controls. I noticed after removing them, the grid was keeping the active row selected. I'm still getting the exception when:
Browser="Xml"
LoadOnDemand="Xml"

So any help would be appreciated.
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1705

Ulises posted over 16 years ago in reply to Ulises

Ok now I'm getting the exception again.
Setting
Browser="Xml"
LoadOnDemand="Xml"
will make the app crash , even with the DataBind on the OnAfterMoveBackward

changing the value of Browser from "Xml" to "Auto" will "fix" it. However, it makes the grid look weird the first time it loads

So is this a bug? or is it just that these settings are incompatible with the navbar?

Thanks !
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1705

Ulises posted over 16 years ago in reply to [Infragistics] Nikola Genov

hey thanks !, now it seems to work better, I thought I did this before.... weird.
Anyway, there is still something.
After adding your code and running the application If you change the page using the Forward or the Reverse button and then click the Next or the Previous button, it won't change the active row, or at least it won't select it, even if I add:

protected void WebNavBar1_ChangeActiveRow(object sender, Infragistics.WebUI.WebNavBar.AfterNavigateEventArgs args)
{
    UWGrdProjects.DisplayLayout.ActiveRow.Selected = true;
}

   OnAfterMoveNext="WebNavBar1_ChangeActiveRow"
                OnAfterMovePrev="WebNavBar1_ChangeActiveRow"

UPDATE: Clicking the Forward and the Reverse buttons will change the page. but for some reason when I click the Next or Previous buttons it will highlight the row in the previous page, I found out this by going back to the previous page after clicking the Next or Previous buttons.

any ideas?

thanks again for your help !!
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3147

[Infragistics] Nikola Genov posted over 16 years ago in reply to Ulises

You need to DataBind the Grid on AfterMoveForward and AfterMoveBackward:
void WebNavBar1_AfterMoveBackward(object sender, Infragistics.WebUI.WebNavBar.AfterNavigateEventArgs args)
{
UWGrdProjects.DataBind();
}

void WebNavBar1_AfterMoveForward(object sender, Infragistics.WebUI.WebNavBar.AfterNavigateEventArgs args)
{
UWGrdProjects.DataBind();
}

Hope that helps.

Best,
Nick
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