[Solved] radGrid dynamic item bind and access values

[dank]

hi I am bindig custom controls(tradextbox,radadateinput vs.)on runtime on a grid.And After post i wantto got values from the custom columns..
the code for creating control snippet like this

 

 

    private void CreateCustomControl(TableCell templateControl, Property property)
        {
            switch (property.UiType)
            {
                case "RadTextBox":
                    #region
                    RadTextBox radTextBox1 = new RadTextBox();
                    radTextBox1.ID = string.Format("RadTextBox_{0}", property.Id);
                    if(!IsPostBack)radTextBox1.Text = property.DefaultValue;
                    if (property.MaxLength != null)
                    {
                        radTextBox1.MaxLength = (int)property.MaxLength;
                    }
                    templateControl.Controls.Add(radTextBox1);
                    #endregion
                    break;
                case "MultilineRadTextBox":
                    #region
                    RadTextBox radTextBox2 = new RadTextBox();
                    radTextBox2.ID = string.Format("MultilineRadTextBox_{0}", property.Id);
                    radTextBox2.TextMode = InputMode.MultiLine;
                    if (!IsPostBack) radTextBox2.Text = property.DefaultValue;
                    if (property.MaxLength != null)
                    {
                        radTextBox2.MaxLength = (int)property.MaxLength;
                    }
                    templateControl.Controls.Add(radTextBox2);
                    #endregion
                    break;
                case "NumericTextBox":
                    #region
                    RadNumericTextBox radNumericTextBox = new RadNumericTextBox();
                    radNumericTextBox.ID = string.Format("NumericTextBox_{0}", property.Id);
                    if (!IsPostBack) radNumericTextBox.Value = !string.IsNullOrEmpty(property.DefaultValue) ? double.Parse(property.DefaultValue) : (double)0;
                    radNumericTextBox.MaxValue = (double)property.MaxValue;
                    radNumericTextBox.MinValue = (double)property.MinValue;
                    templateControl.Controls.Add(radNumericTextBox);
                    #endregion
                    break;
                case "RadDateInput":
                    #region
                    RadDateInput radDatePicker = new RadDateInput();
                    radDatePicker.ID = string.Format("RadDateInput_{0}", property.Id);
                    radDatePicker.ReadOnly = true;

                    if (!string.IsNullOrEmpty(property.DefaultValue))
                    {
                        if (!IsPostBack) radDatePicker.SelectedDate = Convert.ToDateTime(property.DefaultValue);
                    }
                    templateControl.Controls.Add(radDatePicker);
                    #endregion
                    break;
                case "RadComboBox":
                    #region
                    RadComboBox radComboBox = new RadComboBox();
                    radComboBox.ID = string.Format("RadComboBox_{0}", property.Id);
                    string[] options = property.Options.Split('#');
                    string[] optionItemKeyValPair;
                    foreach (string optionItem in options)
                    {
                        optionItemoptionItemKeyValPair = optionItem.Split('$');
                        radComboBox.Items.Add(new RadComboBoxItem(optionItemKeyValPair[0], optionItemKeyValPair[1]));
                    }
                    radComboBox.Items.Insert(0, new RadComboBoxItem(GetGlobalResourceObject("GeneralResource", "PleaseSelect").ToString(), "-1"));
                    if (!IsPostBack) radComboBox.FindItemByValue(property.DefaultValue).Selected = true;
                    templateControl.Controls.Add(radComboBox);
                    #endregion
                    break;
                case "CheckBox":
                    #region
                    CheckBox checkBox = new CheckBox();
                    checkBox.ID = string.Format("CheckBox_{0}", property.Id);
                    if (!IsPostBack) checkBox.Checked = property.DefaultValue == "0" ? false : true;
                    templateControl.Controls.Add(checkBox);
                    #endregion
                    break;
            }
        }

and i call the method  on grid's itemcreated event

        protected void SelectGrid_ItemCreated(object sender, GridItemEventArgs e)
        {
            if (e.Item is GridDataItem)
            {
                GridDataItem item = e.Item as GridDataItem;

                Entities.Domain.Property property = item.DataItem as Entities.Domain.Property;

                if (property != null && property.PropertyTypeCodelookup != null && !string.IsNullOrEmpty(property.PropertyTypeCodelookup.UiType))
                {
                    CreateCustomControl(item["PropertyValueColumn"], property);
                }
            }
        }

and
if i bind grid every page_load event of page,
when i want to take values that entered into this custom controls ,it does resets values.
and if i only bind grid once at pagepostback
when i want to take values over the controls it return null referance...

public List<Property> SelectedProperties
        {
            get
            {
                List<Property> _selectedProperties=new List<Property>();
                Property tmpProperty;
                if (_currentPropertyCollection != null && _currentPropertyCollection.Count > 0)
                {
                    foreach (GridDataItem item in PropertySelectGrid.Items)
                    {
                        if (((CheckBox)item["Selection"].Controls[1]).Checked)
                        {
                            tmpProperty = _currentPropertyCollection.Find(p => p.Id == (Convert.ToInt64(item["Id"].Text)));


                            Control c = item["PropertyValueColumn"].Controls[0];
                            string text = string.Empty;
                            if (c is RadTextBox || c is RadNumericTextBox)
                            {
                                if (c is RadTextBox)
                                {
                                    text = ((RadTextBox)item["PropertyValueColumn"].Controls[0]).Text;
                                }
                                else if (c is RadNumericTextBox)
                                {
                                    text = ((RadNumericTextBox)item["PropertyValueColumn"].Controls[0]).Text;
                                }
                            }
                            else if (c is RadDateInput)
                            {
                                if (((RadDateInput)item["PropertyValueColumn"].Controls[0]).SelectedDate.HasValue)
                                {
                                    text = ((RadDateInput)item["PropertyValueColumn"].Controls[0]).SelectedDate.Value.ToString();
                                }
                            }
                            else if (c is RadComboBox)
                            {
                                if (((RadComboBox)item["PropertyValueColumn"].Controls[0]).SelectedItem != null)
                                {
                                    if (((RadComboBox)item["PropertyValueColumn"].Controls[0]).SelectedItem.Value != "-1")
                                    {
                                        text = ((RadComboBox)item["PropertyValueColumn"].Controls[0]).SelectedItem.Value;
                                    }
                                }
                            }
                            else if (c is CheckBox)
                            {
                                if (((CheckBox)item["PropertyValueColumn"].Controls[0]).Checked)
                                {
                                    text = "1";
                                }
                            }

                            tmpProperty.DefaultValue = text;
                            _selectedProperties.Add(tmpProperty);
                        }
                    }
                }
              //string key = "UnitPropertySelectedList_" + WebSessionManager.DataFilter.CurrentId;
                //if (!WebSessionManager.DataFilter.ObjectList.ContainsKey(key) || WebSessionManager.DataFilter.ObjectList[key] == null)
                //{
                //    List<Property> propertyList = new List<Property>();
                //    WebSessionManager.DataFilter.Add(key, propertyList);
                //}
                //return (List<Property>)WebSessionManager.DataFilter.ObjectList[key];
                return _selectedProperties;
             }

what's wrong with this code?
and how can i  bind controls on grid dynamically  and got values  entered to  them ?

[Nikolay Rusev]

Hello Dank,

Generally if you supply your RadGrid with data on NeedDataSource event you do not need to bind it on every Page.Load event. If you bind it on every post back it is expected to reset control's values. You can find more information on the following help article:
http://www.telerik.com/help/aspnet-ajax/grdadvanceddatabinding.html

Regarding RadGrid lifecycle and event sequence you find more information on the links below:

help articles:
http://www.telerik.com/help/aspnet-ajax/grdeventsequence.html
http://www.telerik.com/help/aspnet-ajax/grddistinguishdifferencesbetweenitemcreateditemdatabound.html 
http://www.telerik.com/help/aspnet-ajax/grdprogrammaticcreation.html

demos:
http://demos.telerik.com/aspnet-ajax/grid/examples/hierarchy/definingstructure/defaultcs.aspx
http://demos.telerik.com/aspnet-ajax/grid/examples/programming/groupby/defaultcs.aspx

One more think that you should have in mind is that DataItem property of GridDataItem has meaning only in the context of ItemDataBound event when the item is already bound.

I hope all this directions are helpful.

All the best,
Nikolay
the Telerik team

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