Calculate difference in weeks using RadDatePicker Control in Javascript in UI for ASP.NET AJAX Calendar

Rahul Khinvasara

303 posts

Member since:
Aug 2007

Posted 26 Aug 2009 Link to this post

Hi,
I am using a RadDatePicker Control on my page. I have to calculate the difference in weeks between the date selected in this RadDatePicker Control and Current Date (i.e Today's Date). I have to display this difference (in weeks) inside a textbox on selecting a date from the RadDatePicker Control. How can I do this ?

I have used the following html code for RadDatePicker Control in my application :-

    
            <telerik:RadDatePicker ID="dtDate" runat="server" DateInput-DateFormat="dd/MM/yyyy" Width="120px" Skin="WebBlue">   
        
            <DateInput DateFormat="dd/MM/yyyy" LabelCssClass="radLabelCss_WebBlue" Skin="WebBlue" runat="server" ID="DateInput6" >   
        
            </DateInput>   
        
            <Calendar Skin="WebBlue" Width="50px" Height="50px">   
        
            </Calendar>   
        
            <DatePopupButton CssClass="radPopupImage_WebBlue" />   
        
            </telerik:RadDatePicker>

Thanks

Dimo

Admin

8471 posts

Posted 26 Aug 2009 Link to this post

Hello Rahul,

Your task is to calculate the difference between two Javascript Date objects. In order to do that, please get familiar with the Javascript Date object API:

http://www.w3schools.com/jsref/jsref_obj_date.asp

After you create your calculation algorithm, use the RadDatePicker's DateSelected client event to get the newly selected date:

http://www.telerik.com/help/aspnet-ajax/calendar_clientsideondateselected.html

<telerik:RadDatePicker ID="RadDatePicker1" runat="server">
<ClientEvents OnDateSelected="MyDateSelected" />
</telerik:RadDatePicker>

Regards,
Dimo
the Telerik team

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Shinu

17764 posts

Member since:
Mar 2007

Posted 28 Aug 2009 Link to this post

Hi Rahul,

Try the following client side code for retrieving the difference in weeks numbers between today's and selected date.

ASPX:

    
            <telerik:RadCalendar ID="RadCalendar1" runat="server"> 
        
            <ClientEvents OnDateSelected="OnDateSelected" /> 
        
            </telerik:RadCalendar>

JavaScript:

    
            <script type="text/javascript"> 
        
            function Week() 
        
            { 
        
                Date.prototype.getMDay = function() 
        
                { 
        
                return (this.getDay() + 6) %7;} 
        
                Date.prototype.getISOYear = function() { 
        
                var thu = new Date(this.getFullYear(), this.getMonth(), this.getDate()+3-this.getMDay()); 
        
                return thu.getFullYear();} 
        
                Date.prototype.getISOWeek = function() { 
        
                var onejan = new Date(this.getISOYear(),0,1); 
        
                var wk = Math.ceil((((this - onejan) / 86400000) + onejan.getMDay()+1)/7); 
        
                if (onejan.getMDay() > 3) wk--;return wk;}  
        
                var today = new Date(); 
        
                return today.getISOWeek(); 
        
            } 
        
            function OnDateSelected(sender, eventArgs) 
        
            {   
        
                var WeekOfYear = eventArgs.get_renderDay().RadCalendarView.GetWeekOfYear(eventArgs.get_renderDay().get_date()) 
        
                var WeekOfToday = Week(); 
        
               // alert(WeekOfYear); 
        
               // alert(WeekOfToday); 
        
                var diff = WeekOfToday - WeekOfYear; 
        
                alert(diff); 
        
            } 
        
            </script>

-Shinu.