Adding image column based on user control property

[Massimiliano]

Hallo I saw the example at
http://demos.telerik.com/aspnet-ajax/fileexplorer/examples/applicationscenarios/customgridcolumns/defaultvb.aspx?#qsf-demo-source
And I also read some other topics and stuff in the control reference but still I didn't come up with an idea on how to solve this.
I use the explorer to upload images (for news, profiles, whatever) and I need to make one of all the uploaded images as the "main one".
I handled all the logic for this but now I would like to display a little image in the file explorer grid near the "main image" so that users can see at a glance which one is the "main image".
So I need to add a column to the grid which will show that image only if the filename is equal to the "main image file name, which I keep in my page/usercontrol property (hidden input field or whatever).
So mangling with the file provider is not useful in my situation since I have to match the file name with a variable which is not accessible inside the file provider (I guess).

Any hint?

Thanks in advance

[Massimiliano]

Instead of adding a column, another option would be to add that icon in the filename column (both before or after the filename).
Anyway in both scenario I would have to hook in the grid databound/itemcreated event I guess, since in the file provider I cannot access the data I need to decide if the icon has to be shown or not (the data is in a hidden field or property in the page/control containing FileExplorer)

[Vessy]

Hello Massimiliano,

You could achieve both of the described scenarios, but still both of the approaches require a custom content provider implementation:

• Custom column - you can access the value from a hidden field on the page containing the FileExplorer control in the way described in this KB article: Get reference to the Page object inside a custom FileBrowserContentProvider
• Change the file name - you can try the approach from this code library, implementing your own logic for adding image icons - Apply changes to the files on the current page

I hope this information will be helpful for you.

Regards,
Vessy
Telerik

 

 

[Massimiliano]

Thank you Vessy much appreciated! I will check them both and report back!

[Massimiliano]

I went for the first solution which is quite straightforward. I got a reference to the host page inside the FileSystemContentProvider but the problem is that the field is inside the User Control where the actual File Explorer is.
Here is the chain: Master Page > Page > User Control > FileExplorer + Hidden Field
I tryed to use FindControl in the Page that I get with the handler, to get a reference to my User Control but it seems that at that stage the User Control is not yet instantiated. Debugging the whole thing, the Page retrieved in the provider has 5 controls in it but only the first is instantiated (which is the master page) the other 4 controls (including my User Control which hosts the FileExplorer + HiddenField) are still Nothing at that stage.

Any hint?

[Massimiliano]

Since FileExplorer uses radgrid to display files wouldn't it be easier to attach to the grid events of the FileExplorer like RadGrid.ItemDataBound or RadGrid.ItemCreated or such?

[Dobromir]

Hi Massimiliano,

In such scenario, you need to go through the whole chain, i.e.:
(HttpContext.Current.Handler as Page).Master.FindControl("ContentPlaceHolder1").FindControl("uc1").FindControl("hidden1").

Regarding RadGrid events, the grid used in the RadFileExplorer is databound on the client and the server-side events are not fired.

Regards,
Dobromir
Telerik

 

 

[Massimiliano]

I've been able to test your solution only today. Sorry for the delay.
It works flawlessly! Thank you so much Dobromir!