Enable/Disable RadGridView's Row with CheckBoxes

[EMRE ANDIC]

Hi,
I need to know how can I enable or disable ReadOnly property of a RadGridView's row. I have CheckBox column, and I want to manage ReadOnly property of selected row with checkboxes.

[Martin Vasilev]

Hi EMRE ANDIC,

Thank you for the question.

One way to implement the described requirement is to cancel the CellBeginEdit event in order to mimic read only behavior depending on your check box column value. Please, consider the following code:
 

void radGridView1_CellBeginEdit(object sender, GridViewCellCancelEventArgs e)
{
    if (e.ColumnIndex != 0 && !CheckValue(this.radGridView1.CurrentRow.Cells[0].Value))
    {
        e.Cancel = true;
    }
}
private bool CheckValue(object value)
{
    if (value is DBNull || value == null)
    {
        return false;
    }
    bool pValue;
    if (Boolean.TryParse(value.ToString(), out pValue))
    {
        return pValue;
    }
    return false;
}

Let me know if you have any other questions.

Greetings,
Martin Vasilev
the Telerik team

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[EMRE ANDIC]

Hi Martin Vasilev,
I decided to abandon checkbox event. 
Is there another way to disable or enable a row according to any of a mouse event, because when I write e.Cancel = true/false to CellBeginEdit event, it enables or disables all rows, but I just want to effect a row at a time.   

[Martin Vasilev]

Hi EMRE ANDIC,

RadGridView uses virtualization (it reuses its RowElements), so you have to use CellFormatting or CellBeginEdit to do the job. Either method needs a condition to determine if particular row should be read-only or not. That means, if you abandon the check-box column approach, you still need a flag to determine the row state. For example you can use row's Tag property for this or just add a hidden column and use its value.
 

Sincerely yours,
Martin Vasilev
the Telerik team

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[Srilakshmi]

Hi,

I am also facing the same problem.I have a radgridview with a checkbox column in it.I have 6 rad combobox in a form in which on last combobox selectedindexchange the gridview loads.
The issue is some rows of gridview should be completely readonly while loading the grid or after immediately the grid has loaded .Please throw some light to solve this issue.

Regards
Luckee.

[Martin Vasilev]

Hello Srilakshmi,

Thank you for contacting us.

As I have mentioned in my previous post, probably the most suitable way to implement the described scenario is by using RowFormatting or CellFormatting event. Just create a conditional statement there, which will determine which row should be read only and which should be not. Some examples of using Row/CellFormatting event you can find in our product documentation.

Let me know if you have any additional questions.

Regards,
Martin Vasilev
the Telerik team

[Srilakshmi]

Hi Martin,

Thanks a lot for your reply and its working.
I have same kind of another problem with grid view.
I am using a telerik grid view in which a column should be validated with numeric values only on key press event.
Please help me regarding this.


Regards
Luckee.

[Emanuel Varga]

Hello Srilakshmi ,

Please take a look at the following example:

using System;
using System.ComponentModel;
using System.Windows.Forms;
using Telerik.WinControls.UI;

public partial class Form1 : Form
{
    private RadGridView radGridView1;

    public Form1()
    {
        InitializeComponent();
        this.Controls.Add(radGridView1 = new RadGridView());
        radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
        radGridView1.Dock = DockStyle.Fill;
        radGridView1.CellBeginEdit += new GridViewCellCancelEventHandler(radGridView1_CellBeginEdit);
    }

    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        radGridView1.DataSource = new TestsCollection(10);
    }

    void radGridView1_CellBeginEdit(object sender, GridViewCellCancelEventArgs e)
    {
        if (radGridView1.Columns[e.ColumnIndex].Name == "Digits")
        {
            var editManager = sender as GridViewEditManager;
            var textBoxEditor = editManager.ActiveEditor as RadTextBoxEditor;
            if (textBoxEditor != null)
            {
                var textBoxElement = textBoxEditor.EditorElement as RadTextBoxEditorElement;
                textBoxElement.KeyPress += new KeyPressEventHandler(textBoxElement_KeyPress);
            }
        }
    }

    void textBoxElement_KeyPress(object sender, KeyPressEventArgs e)
    {
        e.Handled = !char.IsDigit(e.KeyChar);
    }
}

public class Test
{
    public string Text
    {
        get;
        set;
    }

    public string Digits
    {
        get;
        set;
    }
}

public class TestsCollection : BindingList<Test>
{
    public TestsCollection(int noItems)
    {
        for (int i = 0; i < noItems; i++)
        {
            this.Add(new Test
            {
                Text = "Text " + i.ToString(),
                Digits = i.ToString()
            });
        }
    }
}

Hope this helps, if you have any other questions or comments, please let me know,

Best Regards,
Emanuel Varga

[Avinash]

Hi,

I am also facing the same problem similar to that.
In my application I am using a rad grid view and in that I am having check box column. I have added one context menu because on the right click event of the rad grid i should enable all my check boxes. And after all my check boxes are enabled, I shoud close my rows in which the check boxes are enabled by using the buuton click event. So please provide me some help in solving the issue.

Regards,
Avinash

[Nikolay]

Hi Avinash,

I am not sure that I understand your scenario and the issues that you have with it completely. Therefore, I would kindly ask you to open a new support ticket and send me a sample project which demonstrates your case. In addition, describe where exactly you are experiencing issues. Last, but not least, please share more details on the action 'close my rows' and the meaning that you put in it.

Thank you for your cooperation. I am looking forward to receiving the details.

Kind regards,
Nikolay
the Telerik team