Ticket Q438657

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ASPxGridView - Hide / Show Custom Command Button / ASPxGridView.CustomButtonInitialize

B&R

created 12 years ago

Need help with a custom command button I would like to show/hide it according to grid data.
for each row whenever the data in the cell "status" == 'pending" show button else hide button.

C#
protected void grid_HtmlCommandCellPrepared(object sender, ASPxGridViewTableCommandCellEventArgs e)  
{  
    if (e.CommandCellType == GridViewTableCommandCellType.Data && e.CommandColumn.Name == "Goedkeuren")  
    {  
        var rowdata = ((ASPxGridView)sender).GetRowValues(  
            e.VisibleIndex, FacturatiebonControler.FacturatiebonStatusColumnName);  
        if (rowdata != null)  
        {  
            string status = rowdata.ToStringValue();  
            if (status == "Pending") e.CommandColumn.CustomButtons[0].Visibility = GridViewCustomButtonVisibility.AllDataRows;  
            else e.CommandColumn.CustomButtons[0].Visibility = GridViewCustomButtonVisibility.Invisible;  
        }  
    }  

}

My code now but that does not work don't know what I'm doing wrong?

Answers

Mike (DevExpress)

created 12 years ago (modified 12 years ago)

Hello Steve,
It is necessary to use the ASPxGridView.CustomButtonInitialize event for this purpose.
Take a look at the E3028 - ASPxGridView - How to specify the CommandButtons’ and Custom CommandButtons’ properties based on any custom criteria Code Central example to see this technique.

Show previous comments (11)

B&R 12 years ago

Hey Mike
Ok but this is only a part of the sollution I still need the data from the row but this gives me an error
In the example the edit and delete button do exactly what I want but the custom button is not implemented with the visiblecriteria why?

Anthony (DevExpress Support) 12 years ago

Hello,
Would you please describe the encountered issue in greater detail?

B&R 12 years ago

protected void ASPxGridView1_CustomButtonInitialize(object sender, ASPxGridViewCustomButtonEventArgs e) {
        if (e.ButtonID == "btnCustom" && e.VisibleIndex % 2 != 0)
            e.Visible = CustomButtonVisibleCriteria((ASPxGridView)sender, e.VisibleIndex);
    }
     private bool CustomButtonVisibleCriteria(ASPxGridView grid, int visibleIndex)
     {
        if (visibleIndex == -1) return false;
        object row = grid.GetRow(visibleIndex);
        return ((DataRowView)row)["ProductName"].ToString().Contains("a");
    }
In the example i'm missing this and I tried it with my code but get and nullpoint does this work with the example E3028 or how do you do this?

Mike (DevExpress) 12 years ago

Hello,
Make sure that the "row" object is not null:

C#
object row = grid.GetRow(visibleIndex);

If so, cast this object to the required data type.

B&R 12 years ago

Ok the error is not comming from the object row it comes from grid.GetRow(visibleIndex) function.
my code
        protected void grid_CustomButtonInitialize(object sender, ASPxGridViewCustomButtonEventArgs e)
        {
            if (e.ButtonID == "cmdGoedkeuren" && e.VisibleIndex % 2 != 0)
            {
                ASPxGridView grid = (ASPxGridView)sender;
                object row = grid.GetRow(e.VisibleIndex); << here i get the error grid is not null
                if (row != null)
                {
                        object objectValue = ((DataRowView)row)[FacturatiebonControler.FacturatiebonStatusColumnName];
                        string stringValue = objectValue.ToStringValue();
                        if (!string.IsNullOrEmpty(stringValue))
                        {
                            bool pending = stringValue.Contains("Pending").ToBool();
                            if (pending == true)
                                e.Visible = DefaultBoolean.True;
                            else
                            {
                                e.Visible = DefaultBoolean.False;
                            }
                        }
                }
            }
        }
I must be doing somthing wrong but what…
its a 2010 sharepoint webpart

at Hb.pdf

Mike (DevExpress) 12 years ago

Hello,
Add the following condition to avoid data retrieving logic for EmptyDataRow (VisibleIndex = -1):

C#
protected void grid_CustomButtonInitialize(object sender, ASPxGridViewCustomButtonEventArgs e) {  
    if (visibleIndex == -1) return;  

    //...  
}

I have corrected the E3028 example accordingly.

B&R 12 years ago

Hmmm after looking add my code the problem seems to be with order everything get fired if I press the custom button its seems to fire the custombuttoninitialize > datasource selecting > pageload > custombuttoncallback
but i want customcallback > datasource selecting > custombuttoninitialize

Mike (DevExpress) 12 years ago

Hello,
The ASPxGridView control may raise its events in the required manner according to the ASP.NET Page Life cycle. It is not recommended to expect some specific event sequence. Each event is intended for corresponding server-side operations.
Would you please clarify the task you are trying to accomplish and the issue you have encountered in greater detail? If possible, provide us with a sample project based on the E3028 example that illustrates your situation in action. We will do our best to provide you with an appropriate solution.

B&R 12 years ago

The following code works for me only I got a filterrow and now the button is showing in that row if the first row is in state pending
            if (e.VisibleIndex < 0) return;
            if (e.ButtonID == "cmdGoedkeuren")
            {
                ASPxGridView grid = (ASPxGridView)sender;
                if (grid.VisibleRowCount > 0)
                {
                    object row = grid.GetRow(e.VisibleIndex);
                    if (row != null)
                    {
                        try
                        {
                            object objectValue = ((DataRowView)row)[FacturatiebonControler.FacturatiebonStatusColumnName];
                            string stringValue = objectValue.ToStringValue();
                            if (!string.IsNullOrEmpty(stringValue))
                            {
                                bool pending = stringValue.Contains("Pending").ToBool();
                                if (pending == true)
                                    e.Visible = DefaultBoolean.True;
                                else
                                {
                                    e.Visible = DefaultBoolean.False;
                                }
                            }
                        }
                        catch (Exception)
                        {
                        }
                    }
                }
            }

Mike (DevExpress) 12 years ago

Hello,
Would you please clarify whether or not the problem has been resolved? If not, provide the information I requested in my previous comment. I will do my best to help you.

B&R 12 years ago

Hi Mike the problem is solved I do not get and errors anymore but got a new problem see screenshot.
In the filterrow the button is now showing what do I do wrong?

knop.PNG

Mike (DevExpress) 12 years ago

Hello,
This issue sounds strange. By default, the AutoFilterRow contains editors, which are automatically created according to the column type. Please make sure that you are not specifying custom AutoFilterRow cell content by handling the ASPxGridView.AutoFilterCellEditorCreate/ASPxGridView.AutoFilterCellEditorInitialize.
However, it seems that this is another issue. Would you please create a separate ticket in our Support Center and describe this situation in greater detail?
A standalone ASP.NET WebSite/WebApplication (i.e., not a VisualWebPart) that mimics this situation would be helpful.

B&R 12 years ago

Hi
I found the issue with the filterrow I added:
if (e.CellType == GridViewTableCommandCellType.Filter) return;
after debugging the code I found that
if (e.VisibleIndex < 0) return; was not enough because the filter row allso has a VisibleIndex of 0;

Mike (DevExpress) 12 years ago

Hello,
Thank you for informing us that the problem has been resolved.

Created: October 16, 2012 9:29 AM

Modified: November 13, 2012 11:53 AM

Platform: ASP.NET Web Forms

Product: ASPxGridView

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ASPxGridView - Hide / Show Custom Command Button / ASPxGridView.CustomButtonInitialize

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