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problem displaying bool value in formtemplate type edit form insert mode

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Grid

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

26 Answers, 1 is accepted

answered on 29 Jun 2009, 10:42 AM

Hi,

The reason for this error is that your grid instance can not bind a value for the newly inserted item through the Eval()/Bind() syntax. A solution would be to preset the default value of the control(s) when binding to a grid item on the RadGrid.InitInsertCommandName command.

CS:

    
            protected void RadGrid1_ItemCommand(object source, Telerik.Web.UI.GridCommandEventArgs e) 
        
            { 
        
                if ((e.CommandName == RadGrid.InitInsertCommandName)) 
        
                      { 
        
                    e.Canceled = true; 
        
                    //Prepare an IDictionary with the predefined values 
        
                    System.Collections.Specialized.ListDictionary newValues = new System.Collections.Specialized.ListDictionary(); 
        
                    //set initial checked state for the checkbox on init insert 
        
                    newValues("Bool") = false; 
        
                    //Insert the item and rebind 
        
                    e.Item.OwnerTableView.InsertItem(newValues); 
        
                } 
        
            }

Thanks,
Princy

answered on 30 Jun 2009, 06:45 AM

Thanks Princy, it didnt solve my problem but..

I tried your code (see below), but still got the same error "specificed cast is not valid":

protected void RadGrid1_ItemCommand(object source, Telerik.Web.UI.GridCommandEventArgs e)

{

if ((e.CommandName == RadGrid.InitInsertCommandName))

{

e.Canceled = true;

//Prepare an IDictionary with the predefined values

System.Collections.Specialized.ListDictionary newValues = new System.Collections.Specialized.ListDictionary();

//set initial checked state for the checkbox on init insert

newValues["CheckBox1"] = false;

//Insert the item and rebind

e.Item.OwnerTableView.InsertItem(newValues);

}

Then i tried the idea from this thread (http://www.telerik.com/community/forums/aspnet-ajax/grid/checkbox-in-editform.aspx), still no luck, instead I got different error "The name 'Bind' does not exist in the current context"

<asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# (Container is GridEditFormInsertItem) ? "false" : Bind( "IsActive") %>'>

</asp:CheckBox>

is there a demo or tutorial for successful implementation of CheckBox with boolean values in a formtemplate editform?

Accepted

answered on 01 Jul 2009, 12:45 PM

Hello,

Try replacing newValues["CheckBox1"] = false; with the following line of code and see if it helps:

    
            protected void RadGrid1_ItemCommand(object source, Telerik.Web.UI.GridCommandEventArgs e)  
        
            {  
        
                if ((e.CommandName == RadGrid.InitInsertCommandName))  
        
                      {  
        
                    e.Canceled = true;  
        
                    //Prepare an IDictionary with the predefined values  
        
                    System.Collections.Specialized.ListDictionary newValues = new System.Collections.Specialized.ListDictionary();  
        
                    //set initial checked state for the checkbox on init insert  
        
                    newValues["IsActive"] = false;  
        
                    //Insert the item and rebind  
        
                    e.Item.OwnerTableView.InsertItem(newValues);  
        
                }  
        
            }

You can refer to the following document as well to learn more:
Known reasons for error messages

Thanks
Princy.

answered on 11 Aug 2009, 05:50 AM

Hi,
i'm still having the error "Specified cast is not valid." even after the code you posted on jul 1.... it happens if i click "add new" and then (without actually inserting a new item, just leaving the insert form "expanded") try to "edit" an item

error msg shown below:

Specified cast is not valid.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidCastException: Specified cast is not valid.
Source Error:


            Line 92:         <EditItemTemplate>
Line 93: <asp:CheckBox ID="chkbox1" Checked='<%# Bind("hasValue") %>' 
Line 94:                 runat="server" AutoPostBack="True" 
Line 95:                 oncheckedchanged="chkbox1_CheckedChanged" />

thnx in advance,

answered on 28 Aug 2009, 03:52 PM

Hi Truong,

Our scenario was boolean specific, but perhaps you can use this solution.

We used method binding instead so in the HTML you would see the following:

    
            <asp:CheckBox ID="IsEnabled" runat="server" Text="(check to enable item)" Checked='<%# GetDefaultBool(Eval("IsEnabled")) %>' />

For this to work you would also require the supporting method which looks like this:

    
            protected bool GetDefaultBool(object input) 
        
            { 
        
                if (input == null || input.ToString() == "" || input.ToString().ToLower() == "false") 
        
                { 
        
                    return false; 
        
                } 
        
                else 
        
                { 
        
                    return true; 
        
                } 
        
            }

In your case I suspect you could replace the boolean types with Date types.

Regards,
Jacques

answered on 22 Oct 2009, 02:40 PM

I too got a similar problem, that only on insert I would get an error (on edit its ok).
I have nothing in my asp.cs so Princy's solution doesn't apply and I tried J.Hov solution but get an error on edit, instead of insert.
Any other solutions?

    
                <telerik:RadGrid ID="RadGrid1" runat="server" Skin="Sunset" GridLines="None" AllowPaging="True" 
        
                    PageSize="20" AllowSorting="True" AutoGenerateColumns="False" ShowStatusBar="true" 
        
                    AllowAutomaticDeletes="True" AllowAutomaticInserts="True" AllowAutomaticUpdates="True" 
        
                    DataSourceID="sdsPolls" HorizontalAlign="NotSet" AllowMultiRowEdit="true">  
        
                    <MasterTableView CommandItemDisplay="TopAndBottom" DataSourceID="sdsPolls" DataKeyNames="id" 
        
                        EditMode="PopUp">  
        
            <asp:CheckBox ID="cbActive" runat="server" Checked='<%# Bind("active") %>' />

answered on 15 Jan 2014, 07:51 AM

Hello Steve,

Indeed I verified that the described issue exists into current version of the controls. However I will forward it to our developers for further investigation. Also I logged it into our public bug tracking system and I will increase its priority. On the following link you can find the public item and you can vote for it:
http://feedback.telerik.com/Project/108/Feedback/Details/98747-fix-specified-cast-is-not-valid-error-is-thrown-when-radgrid-contains-checkbox
Meantime in order to avoid the problem you can use the approach provided from Princy.

Regards,
Radoslav
Telerik

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answered on 07 Aug 2015, 05:29 PM

Problem displaying checkbox value in template EditFormType insert mode in RadGrid.

I have a webpage displaying a list of departments on left side of page and details about the selected department on rightside. Each department has some general information and department contacts shown on two seperate tabs.

We can add a new contact by clicking the 'Add New' button of RadGrid and filling enough information to insert. If we leave the insert form expanded and select a different department and click on second tab to see the contacts, I'm getting the error "Specified cast is not valid." I am using the ObjectDataSource to fill the RadGrid.

Is there any solution to fix this? Any plan to fix this "http://feedback.telerik.com/Project/108/Feedback/Details/98747-fix-specified-cast-is-not-valid-error-is-thrown-when-radgrid-contains-checkbox"

Thanks,

Rama.

answered on 12 Aug 2015, 08:28 AM

Hi Rama,

As a solution you can try to conditionally bind a value to the check property as demonstrated below.

ASPX:

<asp:CheckBox runat="server" ID="CheckBox1" Checked='<%#(Container is GridEditFormInsertItem) ? false : DataBinder.Eval(Container.DataItem,"IsTrue")%> '/>

Additionally we have planned to research whether we can improve the functionality. If possible we will alter the binding so that an exception is not raised for the insert item. You can monitor our progress from here.

Regards,
Angel Petrov
Telerik

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal and vote to affect the priority of the items

answered on 18 Aug 2015, 06:26 PM

I have checkbox as below:

<asp:CheckBox ID="chkActive" CssClass="checkbox" runat="server" Text="Active"
Checked='<%# Bind( "Active" ) %>' />

As per your suggestion, i have changed it to

<asp:CheckBox ID="chkActive" CssClass="checkbox" runat="server" Text="Active"
Checked='<%#(Container is GridEditFormInsertItem) ? true : DataBinder.Eval(Container.DataItem,"Active")%> ' />

With this change, i am not getting the error "specificed cast is not valid" in insert mode. But this makes to send incorrect values to Update method while editing the item. Please help, thanks in advance.

note: i am using ObjectDataSource to bind the grid, Insert,Update,Delete commands.

Thanks,Rama.