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How to assign a variable to the DataNavigateUrlFormatString property of a hyperlinkcolumn in a datagrid.

Posted on 2004-10-05
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Last Modified: 2007-12-19
I have a vb.net aspx page which allows the user to make certain selections.  The value of the selections is stored in a variable called strPath.

I need to somehow get this variable into DataNavigateUrlFormatString.

I have the following code so far

[code]<%@ Page Language="VB" Debug=true explicit="true" aspcompat=true  %>
<%@ Import Namespace="System.IO" %>

<script language="VB" runat="server">

      Dim strPath As String = "mainfolder"
      Dim strOldPath As String

      Sub Page_Load(sender as Object, e as EventArgs)
            if not Page.IsPostBack then
                  '## GETTING A MAP OF THE DIRECTORY AND SAVING IT IN A ARRAY
                  dim oDir as DirectoryInfo = new DirectoryInfo(Server.Mappath(strPath))
                  dim aList as Array = oDir.GetDirectories()

                  '## BINDING THE DIRECTORY TO THE DROPDOWNLIST AND ADDING AND MAIN
                  '## DIRECTORY TO THE TOP OF THE LIST
                  ddlSubFolders.Datasource = aList
                  ddlSubFolders.DataBind()
                  ddlSubFolders.Items.Insert(0, strPath)

                  '## BINDING THE MAIN DIRECTORY TO THE DATAGRID
                  dgFileList.DataSource = oDir.GetFiles()
                  dgFileList.DataBind()
                  
                  lblDocCount.text = "<font color=#4B92D9>" & dgFileList.items.count & "</font> document(s) found"
            end if
      End Sub
      
      '## CHANGES THE DIRECTORY BASED ON THE SELECTED DROPDOWNLIST ITEM
      Sub FolderChange(sender as Object, e as EventArgs)
            '## CHECKS TO SEE IF THE FIRST LISTITEM IS SELECTED OR NOT
            if ddlSubFolders.SelectedIndex = 0 then
                  strOldPath = strPath
            Else
                  strOldPath = strPath & "/"
                  strOldPath = strOldPath & ddlSubFolders.SelectedItem.Text
            End If
            
            '## REBINDS THE PAGES WITH THE NEW DIRECTORY INFORMATION
            dim oDir as DirectoryInfo = new DirectoryInfo(Server.Mappath(strOldPath))
            dgFileList.DataSource = oDir.GetFiles()
            dgFileList.DataBind()
            
            lblDocCount.text = "<font color=#4B92D9>" & dgFileList.items.count & "</font> document(s) found"
      End Sub
</script>

<html>
      <head>
            <title>Page Title</title>
      </head>
      <body>
            <form id="form1" method="Post" runat="server">
                  <asp:Label
                                    id="page_title"
                                    Font-Size="11"
                                    Font-Name="Arial"
                                    Font-Bold="true"
                                    ForeColor="#00436c"
                                    text=""
                                    runat="server" /><br />
                                    
                  <asp:dropdownlist
                                    id="ddlSubFolders"
                                    Font-Name="Arial"
                                    font-size="8"
                                    runat="server"
                                    OnSelectedIndexChanged="FolderChange"
                                    autopostback="true" /><p />
                                    
                  <asp:DataGrid
                                    id="dgFileList"
                                    runat="server"
                                    gridlines="none"
                                    AutoGenerateColumns="false"
                                    Font-Name="arial"
                                    showheader="false">
                        <Columns>
                              <asp:HyperLinkColumn
                                    DataNavigateUrlField="Name"
                                    DataNavigateUrlFormatString="staticfolder/{0}"
                                    DataTextField="Name"
                                    Target="_Blank" />
                        </Columns>
                  </asp:DataGrid><br />
                  
                  <asp:label id="lblDocCount" runat="server" />
            </form>
      </body>
</html>[/code]
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Question by:narmi2
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8 Comments
 
LVL 18

Expert Comment

by:DotNetLover_Baan
ID: 12225346
Which part is giving you trouble ?
-Baan
0
 
LVL 1

Author Comment

by:narmi2
ID: 12225362
the following needs to be dynamic, i dont know if thats possible without changing the whole solution:

DataNavigateUrlFormatString="staticfolder/{0}"

i need to get the variable "strOldPath into DataNavigateUrlFormatString somehow!
0
 
LVL 5

Expert Comment

by:stumpy1
ID: 12225369
Can you not just assign strPath to DataNavigateUrlFormatString through the VB server code?
0
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LVL 1

Author Comment

by:narmi2
ID: 12225375
True, whats the best way to get around this?
0
 
LVL 1

Author Comment

by:narmi2
ID: 12225385
sorry i miss read your post stumpy.

I dunno how to do that?
0
 
LVL 1

Author Comment

by:narmi2
ID: 12225478
to give you a better understanding of the problem, the hyperlinks produce the following url

http://192.168.100.16/mainfolder/staticfolder/test.doc

I need the staticfolder bit to be dynamic.

I thought I would simply be able to do something like

DataNavigateUrlFormatString="<%strOldPath%>/{0}"

But this gives the following url

http://192.168.100.16/mainfolder/<%strOldPath%>/test.doc
0
 
LVL 28

Expert Comment

by:mmarinov
ID: 12225486
Hi,

replace this
<Columns>
                         <asp:HyperLinkColumn
                              DataNavigateUrlField="Name"
                              DataNavigateUrlFormatString="staticfolder/{0}"
                              DataTextField="Name"
                              Target="_Blank" />
                    </Columns>

with this

<Columns>
     <asp:TemplateColumn>
        <ItemTemplate>
            <asp:HyperLink id="hl" runat="server" NavigateUrl="<%# DataBinder.Eval(Container.DataItem, "strOldPath") %>/<%# DataBinder.Eval(Container.DataItem, "Name") %>" Text="<%# DataBinder.Eval(Container.DataItem, "Name") %>
" />

        </ItemTemplate>
     </asp:TemplateColumn>
</Columns>


Regards,
B..M
0
 
LVL 18

Accepted Solution

by:
DotNetLover_Baan earned 2000 total points
ID: 12225502
This can be done in datagrid's ItemBound event.

Sub dgFileList_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
        Dim HLCol As HyperLinkColumn
        HLCol = MyDataGrid.Columns(0)
        HLCol.DataNavigateUrlFormatString = "staticfolder/{0}"
End Sub
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