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Rebind Command Item

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Josh
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Josh asked on 19 Aug 2010, 07:38 PM
Hello,

I have a grid inside a user control with ajax. On the command item template, there is a linkbutton which initially has its visible property set to false. After a viewstate property is set, the grid's rebind method is called, which in turn causes the ItemCreated event to fire, at which time I find the linkbutton and set its visible property to true. The problem is, the button disappears again after a postback. I thought the problem was with the viewstate, but I changed the ItemCreated to always set it to visible. I found that when the postback occurs, the ItemCreated event fires but the button still disappears after being set to visible on the server. I also tried calling the rebind() method on every page_load but that causes problems with other postback commands (edit, delete). Is there a way to tell the command item to rebind?

Thank you
(Using Q2 2010 and IE7)

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Mira
Telerik team
answered on 20 Aug 2010, 02:39 PM
Hello Josh,

I tried to replicate the issue which you described, but to no avail.
Attached to this message, you will find the code which I used for testing.

Please, take a look at it and let me know if there are any differences at your end, which I may be leaving out.

Sincerely yours,
Mira
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Josh
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answered on 26 Aug 2010, 10:11 PM
Hi Mira,

Thanks for looking into this. The difference between my project and the test code is that the grid is inside a user control which is dynamically loaded into a RadPageView (which is itself dynamically created) on page_load.

I have created a workaround: I first changed the 'Visible="false"' property to 'style="display:none;"', and then did the following on the ItemCreated event:

protected void grid_ItemCreated(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridCommandItem)
        {
            LinkButton addButton = (LinkButton)e.Item.FindControl("btnAdd");
            if (addButton != null && Edit)
            {
                RadAjaxManager.GetCurrent(Page).ResponseScripts.Add("setVisible('" + addButton.ClientID + "');");
            }
        }
    }

The javascript function then finds the button by its client ID and sets the display to 'block'. This method seems to be working and if there isn't a simple way to rebind the command item server-side then I'll stick with this.

Thank you,
Josh
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Mira
Telerik team
answered on 31 Aug 2010, 04:06 PM
Hello Josh,

I am glad the issue is resolved.
Another way to implement the same functionality can found in the sample project attached to my previous message.

Sincerely yours,
Mira
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