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User Control with event dynamic creation and ajaxifying it

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Ajax
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Geoff
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Geoff asked on 30 Oct 2015, 07:01 PM

I have a user control creates a control which includes a RadDateTimePicker. The datetimepicker has a SelectedDateChanged event that fires and runs the code accordingly. Since it is dynamically created, I need to dynamically add it to the RadAjaxManager that already exists. My current approach doesn't seem to work, and I get a full postback.

 

User Control

 

public partial class CategoryHolder : System.Web.UI.UserControl
    {
        public string _category;
        public string _mptt;
        public DateTime _startDate;
        public DateTime _endDate;
        public EventHandler startDateChanged;
        public EventHandler endDateChanged;
 
 
        public string Category
        {
            get
            {
                return _category;
            }
 
            set
            {
                _category = value;
 
 
            }
        }
 
        public string MPTT
        {
            get
            {
                return _mptt;
            }
 
            set
            {
                _mptt = value;
                
 
            }
        }
 
        public DateTime StartDate
        {
            get
            {
                return _startDate;
            }
 
            set
            {
                _startDate = value;
                 
 
            }
        }
 
        public DateTime EndDate
        {
            get
            {
                return _endDate;
            }
 
            set
            {
                _endDate = value;
                 
            }
        }
 
        protected void Page_Init(object sender, EventArgs e)
        {
 
        }
 
        protected void Page_Load(object sender, EventArgs e)
        {
            Label lbl = new Label();
            HiddenField hf = new HiddenField();
            RadDateTimePicker start = new RadDateTimePicker();
            RadDateTimePicker end = new RadDateTimePicker();
 
            start.AutoPostBack = true;
            start.SelectedDateChanged += new Telerik.Web.UI.Calendar.SelectedDateChangedEventHandler(start_SelectedDateChanged);
            start.ClientIDMode = System.Web.UI.ClientIDMode.Static;
            start.ID = MPTT + "StartControl";
            start.DatePopupButton.Visible = false;
            start.TimePopupButton.Visible = false;
 
            end.AutoPostBack = true;
            end.SelectedDateChanged += new Telerik.Web.UI.Calendar.SelectedDateChangedEventHandler(end_SelectedDateChanged);
            end.ClientIDMode = System.Web.UI.ClientIDMode.Static;
            end.ID = MPTT + "EndControl";
            end.DatePopupButton.Visible = false;
            end.TimePopupButton.Visible = false;
             
 
            lbl.Text = Category;
            hf.Value = MPTT;
            start.SelectedDate = StartDate;
            end.SelectedDate = EndDate;
 
            this.Controls.Add(lbl);
            this.Controls.Add(hf);
            this.Controls.Add(start);
            this.Controls.Add(end);
 
        }
 
 
        void start_SelectedDateChanged(object sender, Telerik.Web.UI.Calendar.SelectedDateChangedEventArgs e)
        {
            if (this.startDateChanged != null)
            {
                this.startDateChanged(this, e);
            }
        }
 
        void end_SelectedDateChanged(object sender, Telerik.Web.UI.Calendar.SelectedDateChangedEventArgs e)
        {
            if (this.endDateChanged != null)
            {
                this.endDateChanged(this, e);
            }
        }
    }

 

Test Page using control:

 

<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <telerik:RadScriptManager ID="rsm" runat="server"></telerik:RadScriptManager>
    <telerik:RadAjaxManager ID="ram" runat="server"></telerik:RadAjaxManager>
    <div>
    <asp:PlaceHolder ID="Placeholder" runat="server"></asp:PlaceHolder>
    </div>
    </form>
</body>
</html>

Test Page C#:

protected void Page_Load(object sender, EventArgs e)
 {
     CategoryHolder ch = new CategoryHolder();
 
     ch.Category = "Test Category";
     ch.MPTT = "dfdfdopfksdopfsdop";
     ch.StartDate = DateTime.Today;
     ch.EndDate = DateTime.Today.AddDays(5);
     ch.startDateChanged += new EventHandler(startPicker_SelectedDateChanged);
 
     RadAjaxManager manager = RadAjaxManager.GetCurrent(Page);
     RadAjaxLoadingPanel loadingPanel = new RadAjaxLoadingPanel();
 
     Placeholder.Controls.Add(ch);
 
     manager.AjaxSettings.AddAjaxSetting(ch, ch, loadingPanel);
     manager.AjaxSettings.AddAjaxSetting(ch, Placeholder, loadingPanel);
 }
 
 void startPicker_SelectedDateChanged(object sender, EventArgs e)
 {
     //Yay it runs, but on a full postback
 }

3 Answers, 1 is accepted

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0
Eyup
Telerik team
answered on 03 Nov 2015, 07:07 AM
Hi Geoff,

Try applying the programmatic settings during the PreRender event handler of the picker control:
http://docs.telerik.com/devtools/aspnet-ajax/controls/ajax/radajaxmanager/how-to/add-ajaxsettings-programmatically

Hope this helps.

Regards,
Eyup
Telerik
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0
Geoff
Top achievements
Rank 1
answered on 05 Nov 2015, 08:04 PM

Thanks. That did help with getting the ajax to work. However, the loadingpanel doesn't give any visual response. Load times on occasion can take a bit so a visual load trigger is much needed.

 

protected void Page_PreRender(object sender, EventArgs e)
{
    RadAjaxManager manager = RadAjaxManager.GetCurrent(Page);
    RadAjaxLoadingPanel loadingPanel = new RadAjaxLoadingPanel();
 
    foreach (HtmlGenericControl containerDiv in CateogriesAddPlaceHolder.Controls)
    {
       foreach (CategoryHolder ch in containerDiv.Controls)
       {
               RadDateTimePicker startPicker = (RadDateTimePicker)ch.FindControl(ch.MPTT + "StartControl");
 
               manager.AjaxSettings.AddAjaxSetting(startPicker, CateogriesAddPlaceHolder, loadingPanel, UpdatePanelRenderMode.Inline);
               manager.AjaxSettings.AddAjaxSetting(startPicker, startPicker, loadingPanel, UpdatePanelRenderMode.Inline);
 
       }
    }
}

0
Maria Ilieva
Telerik team
answered on 10 Nov 2015, 01:20 PM
Hi,

Try adding a Skin for the RadAjaxLoadingPanel and see how this will work.

Regards,
Maria Ilieva
Telerik
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Asked by
Geoff
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Answers by
Eyup
Telerik team
Geoff
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Maria Ilieva
Telerik team
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