[Solved] Next month arrow is disabled if Value is less than 1 month from MaxDate

[Lothar James Foss]

I am seeing this problem with MVC 1, using version 2010.1.309 of the controls, however it can also be replicated using your demo page http://demos.telerik.com/aspnet-mvc/Calendar?theme=vista with the following settings:

- show dates between 1/1/1900 and 7/14/2010 

- have pre-selected 6/15/2010

I have so far only tested with IE 8 and Google Chrome.

[Georgi Krustev]

Hello Lothar,

Thank you drawing our attention to this issue. I am glad to inform you that this bug was fixed and the fix will be included in the next release of Telerik Components for ASP.NET MVC.

Here is the code excerpt, which you need to replace in order to fix this issue by yourself. The code is placed in CalendarHtmlBuilder.cs in the Telerik.Web.Mvc project.

[Old]:

public IHtmlNode NavigationTag()
{
    IHtmlNode tag = new HtmlTag("div")
                    .AddClass(UIPrimitives.Header);

    DateTime? focusedDate = Calendar.DetermineFocusedDate();

    tag.Children.Add(NavigationLink(CalendarNavigation.Prev, focusedDate,
         focusedDate.Value.AddMonths(-1) < Calendar.MinDate ? true : false));

    tag.Children.Add(NavigationLink(CalendarNavigation.Fast, focusedDate, false));

    tag.Children.Add(NavigationLink(CalendarNavigation.Next, focusedDate,
         focusedDate.Value.AddMonths(1) > Calendar.MaxDate ? true : false));

    return tag;
}

[New]:

public IHtmlNode NavigationTag()
{
    IHtmlNode tag = new HtmlTag("div")
                    .AddClass(UIPrimitives.Header);

    DateTime? focusedDate = Calendar.DetermineFocusedDate();

    tag.Children.Add(NavigationLink(CalendarNavigation.Prev, focusedDate,
        CompareDates(focusedDate, Calendar.MinDate, true) <= 0 ? true : false));

    tag.Children.Add(NavigationLink(CalendarNavigation.Fast, focusedDate, false));

    tag.Children.Add(NavigationLink(CalendarNavigation.Next, focusedDate,
        CompareDates(focusedDate, Calendar.MaxDate, false) >= 0 ? true : false));

    return tag;
}

private int CompareDates(DateTime? focusedDate, DateTime? boundaryDate, bool isPrev)
{
    if (!focusedDate.HasValue || !boundaryDate.HasValue)
        return isPrev ? 1 : -1;

    DateTime focusedDateValue = focusedDate.Value;
    DateTime boundaryDateValue = boundaryDate.Value;

    int result;
    if (focusedDateValue.Year > boundaryDateValue.Year)
    {
        result = 1;
    }
    else if (focusedDateValue.Year < boundaryDateValue.Year)
    {
        result = -1;
    }
    else
    {
        result = focusedDateValue.Month == boundaryDateValue.Month ? 0
               : focusedDateValue.Month > boundaryDateValue.Month ? 1
               : -1;
    }

    return result;
}

I have updated your Telerik points.

Regards,
Georgi Krustev
the Telerik team

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