Disabling calendar days

Environment

Product

Telerik WebForms DatePicker for ASP.NET AJAX

Description

This project demonstrates how you can disable calendar days (e.g. weekend days) in the calendar component of RadDatePicker.

Solution

In order to achieve the desired functionality you need to handle both the server-side DayRender and client-side OnDayRender events of the calendar control - the former is necessary for disabling the days on initial page load or postback (the client-side event is not executed on page load) and the latter - for disabling the days on client-side navigation to a different month view.

The idea is to replace the default cell content (anchor tag) with a span element and modify the appearance of the disabled days - the specific implementation of the server-side and the client-side event handlers varies and can be found in the attached project with inline comments.

ASP.NET

<telerik:RadDatePicker ID="RadDatePicker1" runat="server">
    <Calendar  runat="server" OnDayRender="Calendar_OnDayRender">
        <ClientEvents OnDayRender="OnDayRender" />
    </Calendar>
</telerik:RadDatePicker>

JavaScript

function OnDayRender(calendarInstance, args) {
    // convert the date-triplet to a javascript date
    // we need Date.getDay() method to determine 
    // which days should be disabled (e.g. every Saturday (day = 6) and Sunday (day = 0))                
    var jsDate = new Date(args.get_date()[0], args.get_date()[1] - 1, args.get_date()[2]);
    if (jsDate.getDay() == 0 || jsDate.getDay() == 6) {
        var otherMonthCssClass = "rcOutOfRange";
        args.get_cell().className = otherMonthCssClass;
        // replace the default cell content (anchor tag) with a span element 
        // that contains the processed calendar day number -- necessary for the calendar skinning mechanism 
        args.get_cell().innerHTML = "<span>" + args.get_date()[2] + "</span>";
        // disable selection and hover effect for the cell
        args.get_cell().DayId = "";
    }
}

C#

protected void Page_Load(object sender, EventArgs e)
{
    //necessary not to repeat the special days on postback
    if (!Page.IsPostBack)
    {
        RadDatePicker1.Calendar.SpecialDays.Clear();
    }
}

// necessary to disable the weekend days on first page load
protected void Calendar_OnDayRender(object sender, Telerik.Web.UI.Calendar.DayRenderEventArgs e)
{
    // modify the cell rendered content for the days we want to be disabled (e.g. every Saturday and Sunday)
    if (e.Day.Date.DayOfWeek == DayOfWeek.Saturday || e.Day.Date.DayOfWeek == DayOfWeek.Sunday)
    {
        // if you are using the skin bundled as a webresource("Default"), the Skin property returns empty string
        string calendarSkin = RadDatePicker1.Calendar.Skin != "" ? RadDatePicker1.Calendar.Skin : "Default";
        string otherMonthCssClass = "rcOutOfRange";

        // clear the default cell content (anchor tag) as we need to disable the hover effect for this cell
        e.Cell.Text = "";
        e.Cell.CssClass = otherMonthCssClass; //set new CssClass for the disabled calendar day cells (e.g. look like other month days here)

        // render a span element with the processed calendar day number instead of the removed anchor -- necessary for the calendar skinning mechanism
        Label label = new Label();
        label.Text = e.Day.Date.Day.ToString();
        e.Cell.Controls.Add(label);

        // disable the selection for the specific day
        RadCalendarDay calendarDay = new RadCalendarDay();
        calendarDay.Date = e.Day.Date;
        calendarDay.IsSelectable = false;
        calendarDay.ItemStyle.CssClass = otherMonthCssClass;
        RadDatePicker1.Calendar.SpecialDays.Add(calendarDay);
    }
}

VB

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    ' necessary not to repeat the special days on postback
    If Not Page.IsPostBack Then
        RadDatePicker1.Calendar.SpecialDays.Clear()
    End If
End Sub

' necessary to disable the weekend days on first page load
Protected Sub Calendar_OnDayRender(ByVal sender As Object, ByVal e As Telerik.Web.UI.Calendar.DayRenderEventArgs)
    ' modify the cell rendered content for the days we want to be disabled (e.g. every Saturday and Sunday)
    If (e.Day.Date.DayOfWeek = DayOfWeek.Saturday Or e.Day.Date.DayOfWeek = DayOfWeek.Sunday) Then
        ' if you are using the skin bundled as a webresource("Default"), the Skin property returns empty string
        Dim calendarSkin = RadDatePicker1.Calendar.Skin
        If (calendarSkin = "") Then
            calendarSkin = "Default"
        End If
        Dim otherMonthCssClass As String = "rcOutOfRange"

        ' clear the default cell content (anchor tag) as we need to disable the hover effect for this cell
        e.Cell.Text = ""
        e.Cell.CssClass = otherMonthCssClass ' set new CssClass for the disabled calendar day cells (e.g. look like other month days here)

        ' render a span element with the processed calendar day number instead of the removed anchor -- necessary for the calendar skinning mechanism 
        Dim label As Label = New Label
        label.Text = e.Day.Date.Day.ToString
        e.Cell.Controls.Add(label)

        ' disable the selection for the specific day
        Dim calendarDay As RadCalendarDay = New RadCalendarDay
        calendarDay.Date = e.Day.Date
        calendarDay.IsSelectable = False
        calendarDay.ItemStyle.CssClass = otherMonthCssClass
        RadDatePicker1.Calendar.SpecialDays.Add(calendarDay)
    End If
End Sub