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[Solved] Set initial filter on a custom filter template

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Grid

This is a migrated thread and some comments may be shown as answers.

Anthony asked on 13 Oct 2009, 02:18 PM

I am using the Telerik Grid with a filter template, which I used the following example to create.
http://demos.telerik.com/aspnet-ajax/grid/examples/programming/filtertemplate/defaultcs.aspx

Everything is working great with the filter except for one condition. There are times in my application where I would like a filter to be applied when the page loads. I tried to accomplish this with the following code.

    
                    protected override void SetCurrentFilterValueToControl(TableCell cell)  
        
                    {  
        
                        if (!(this.CurrentFilterValue == ""))  
        
                        {  
        
                            RadComboBox rcBox = ((RadComboBox)cell.Controls[0]);  
        
                            rcBox.Items.FindItemByText(this.CurrentFilterValue).Selected = true;  
        
                            if (HttpContext.Current.Session["SelectedClassName"] != null)  
        
                            {  
        
                                HttpContext.Current.Session.Remove("SelectedClassName");  
        
                                ((GridFilteringItem)(((RadComboBox)rcBox).Parent.Parent)).FireCommandEvent("Filter", new Pair("EqualTo", this.CurrentFilterValue));  
        
                            }  
        
                        }  
        
                    }

The CurrentFilterValue is set and the filter event is fired, but when the page loads I get an error right after the grid tries to databind which says "There was a problem extracting DataKeyValues from the DataSource. Please ensure that DataKeyNames are specified correctly and all fields specified exist in the DataSource." Is there a way to implement this functionality with filtering?

3 Answers, 1 is accepted

answered on 16 Oct 2009, 01:13 PM

Hi Pavlina,

I took a look at the example you posted and it doesn't seem to have much in the way of setting the initial filter value. My problem is that sometimes when a user hits the page that my grid is on I need a column in the grid to already be filtered. I am calling the SetCurrentFilterValueToControl and GetCurrentFilterValueFromControl functions which is setting the correct filter values, however when I try to fire the filter event the column it isn't being filtered by those values, and I am getting the error that I posted in my previous post. I am using a dropdownlist to filter like in this example http://demos.telerik.com/aspnet-ajax/grid/examples/programming/filtertemplate/defaultcs.aspx