Mutually Exclusive CHeckboxes in a GridView

[btreddy]

Hii experts,

I 've a gridview with one template coloumn with checkbox in that,which is used to to select the row..so once the user select one perticular checkbox..it has to clear the checkbox already in checked state ..i.e. at a time hes allowed to select only one checkbox.(check boxes should be mutually exclusive)

Requesting you all kindly tell me how to implement this .

Thanks in advance..

Rgds,
BTR.

[Dormilich]

better use a radio button, there is only one allowed for selection (given they have the same name attribute)

[btreddy]

Hii Thanks for your reply....but i would like to provide an option like user should be able to deselect the selected check box thts the reason why i choose checkboxes.

Kincly provide me the solution.

Rgds,
BTR.

[acoder]

How about a "None of the above" option?

[btreddy]

if the user wants to modify the details of any row in the gridview he will select the checkbox in the perticular row and cilck the "edit" button.

so i wanna to allow the user to select only one row for editing at a time .This is what my requirment is.

[Dormilich]

like acoder said, if you want to deselect all radio buttons, make a click button that will do that (call it maybe "unselect all"), that's far easier that trying to force the checkbuttons.

[acoder]

You could allow them to edit more than one row at any one time.

Anyway, to answer your question, one way is to set all their checked properties to false. Then set the clicked one to true. The alternative proposed by Dormi makes more sense though.

[btreddy]

Thank you very much for your replies.

I solved it by using javascript.

function uncheckOthers(id)
    {        
        var elm = document.getElementsByTagName('input');        
        for(var i = 0; i < elm.length; i++)
        {                            
            if(elm.item(i).id.substring(id.id.lastIndexOf('_')) == id.id.substring(id.id.lastIndexOf('_')))
            {
                if( elm.item(i).type == "checkbox" && elm.item(i)!=id)
                    elm.item(i).checked = false;
            }
        }
    }

and in the codebehind

protected void GridViewParticipants_OnRowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
 {
            string strScript = "uncheckOthers(" + ((CheckBox)e.Row.Cells[0].FindControl("chkselect")).ClientID + ");";
            ((CheckBox)e.Row.Cells[0].FindControl("chkselect")).Attributes.Add("onclick", strScript);                 
            
  }
}

Rgds,
BTR.

[acoder]

Yes, that would be the idea if you insist. However, you could improve it by using the checkbox objects, e.g. document.forms[formName].elements["chkselect"], then you'd only need to check that the ID is not the same.

PS. please use [code] tags when posting code.

[bipinchacko]

hey...btreddy
Thats a very good idea.. i was really struggling with the same problem..
Thanks a lot buddy..