accessing file input while in edit mode of datalist

[carlblanchard]

Hey All i am building an image gallery and i have used a datalist for repeating all the itmes in the gallery, when i want to update an image i have stuck a html:file input within the edit region of the datalist

How can i access the fileInput in the code behind

If Len(Me.FileUpload.Value) <> 0 Then
            objFile.Upload(Me.FileUpload.PostedFile)
            objFile.Resize()
            strFileName = objFile.NewFileName
        Else
            strFileName = "NA.gif"
        End If

When the fileInput control is in the datalist how do i access it ?

thanks in advance

Carl

[dj4uk]

Well first you need button of some kind to postback the page and hence upload the file.

Best thing to do is use a simple button and set its CommandName to "Update". You can then use the UpdateCommand event to fire a method that will process the upload. You'll need to set the OnUpdateCommand property for the datalist to point to the right method.

Inside the UpdateCommand method you first need to grab the HtmlInputFile into a local variable using the DataListCommandEventArgs passed into the method and the FindControl method that will find the file upload by its control's ID. You can then check if a file was uploaded and process it accordingly.

In C# this would be roughly:

void blah_UpdateCommand(Object sender, DataListCommandEventArgs e) {
	HtmlInputFile filupload = (HtmlInputFile) e.Item.FindControl("upload");

	if (filupload.PostedFile.ContentLength > 0) {
		// A file has been uploaded.
	}
}

<datalist id="blah" OnUpdateCommand="blah_UpdateCommand">
	<ItemTemplate>
		Stuff in here...
	</ItemTemplate>
	<EditItemTemplate>
		<input type="file" id="upload" />
		<asp:Button id="update" CommandName="Update" Text="UPDATE!" />
	</EditItemTemplate>
</datalist>

Hope that makes sense.

DJ

[carlblanchard]

nice one DJ

It works like a dream thank you very much

Carl

[carlblanchard]

DJ if i wanted to make a button visible / invisiable within the page load event
how would i set the DataListCommandEventArgs because the e is already decalred on the System.EventArgs

basically i only want administrators of the site to be able to edit content
so i was thinking when they log in i set a session variable with the users rights and when i load a page i check the session to see if its an administrator if so then i make the edit button visiable

some thing like

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'hide all the administration buttons 
        If Session.Item("URights") = 1 Then
            Dim btnEdit As Button '= now i have to find the control 
        End If
 
 
        If Not Page.IsPostBack Then
            loadarticle()
        End If
 
 
    End Sub

[dj4uk]

As the control is in an databound control you need to set the edit button visible/hidden during databinding not on page load.

Try:

	<ItemTemplate>
		<asp:Button id="btnEdit" runat="server" Text="EDIT!" CommandName="Edit" Visible=<%# Session.Item("URights") = 1 %> />
	</ItemTemplate>

This will set the visible property to true or false on DataBind. Be careful with the quotes notice there aren't any around the data bound expression.

HTH

DJ

[carlblanchard]

thanks DJ your a star