Question

update panel triggers with canlendar extender

Asked by: mikolim

Hi experts,
i am making a leave application form formatted with html tables.
i have 2 text box  intended to capture the start date and end date of the leave application via calendar extender(ajax toolkit). I also have a label field which is intended to display the calculated numbers of day as the user input the date into the textbox using the calendar. I already have the functions that is able to calculate and change the value the label to reflect the calculated time span in terms of number of days.
i wish to be able to trigger an update to a label field when user input into textbox using calendar extender. for example when user input values into the textbox using the ajax calendar, it will be able to detect that something had been inputted into the textbox and call the function to calculate the number of days and update the label field. i am trying to use an update panel and set the triggers  to the 2 textbox but doesn't know the right way to do it, please provide assistance in c#.

Thanks 

<table border="1" class="leave">          	
            <tr>
            	<th>Date Applied</th>
            	<td>
                    <asp:Label ID="lbl_dateApplied" runat="server"></asp:Label>
            	</td>
            </tr>
          	<tr>
            	<th>Leave Type</th>
                <td>
                    <asp:DropDownList ID="ddl_leaveType" runat="server">
                        <asp:ListItem Value="Annual" Selected= "True" >Annual</asp:ListItem>
                        <asp:ListItem Value="Medical" >Medical</asp:ListItem>
                        <asp:ListItem Value="Childcare" >Childcare</asp:ListItem>
                        <asp:ListItem Value="Maternity" >Maternity</asp:ListItem>
                        <asp:ListItem Value="Others" >Others</asp:ListItem>
                    </asp:DropDownList>                	
                </td>
            </tr>
            <tr>
            	<th>Employee Name</th>
            	<td>
            	    <asp:Label ID="lbl_employeeName" runat="server"></asp:Label>
            	</td>
            </tr>
            <tr>
            	<th>Department</th>
            	<td>
            	    <asp:Label ID="lbl_department" runat="server"></asp:Label>
            	</td>
            </tr>
            <tr>
            	<th>Start date</th>
            	<td>            	    
                    <asp:TextBox ID="tb_startDate" AutoPostBack="true" runat="server" 
                        ontextchanged="tb_startDate_TextChanged"></asp:TextBox>&nbsp;<asp:ImageButton 
                        ID="calendarIMG_1" CausesValidation="false" runat="server" 
                        ImageUrl="~/Pages/Images/calendar1.png" onclick="calendarIMG_1_Click" /><br/>                    
                    <asp:RequiredFieldValidator runat="server" id="rfv_startDate" controltovalidate="tb_startDate" errormessage="Enter Start Date!" />
                    <cc1:CalendarExtender ID="CalendarExtender1"  Enabled="true" TargetControlID="tb_startDate" format="MM dd yyyy" PopupButtonID="calendarIMG_1" runat="server">
                    </cc1:CalendarExtender>
                    <cc1:TextBoxWatermarkExtender ID="TextBoxWatermarkExtender1" TargetControlID="tb_startDate" WatermarkCssClass="watermarked" WatermarkText="(mm dd yyyy)" runat="server">
                    </cc1:TextBoxWatermarkExtender><br/>                                                             
                    <asp:Label ID="lbl_errorMsg_startDate" runat="server" ForeColor="Red"></asp:Label>                                        
            	</td>
            </tr>        
            <tr>
            	<th>End date</th>
            	<td>                    
            	    <asp:TextBox ID="tb_endDate" AutoPostBack="true" runat="server"></asp:TextBox>&nbsp;<asp:ImageButton 
                        ID="calendarIMG_2" CausesValidation="false" runat="server" 
                        ImageUrl="~/Pages/Images/calendar2.png" onclick="calendarIMG_2_Click" /><br/>
            	    <asp:RequiredFieldValidator runat="server" id="rfv_endDate" controltovalidate="tb_endDate" errormessage="Enter End Date!" />
            	    <cc1:CalendarExtender ID="CalendarExtender2"  Enabled="true" TargetControlID="tb_endDate" format="MM dd yyyy" PopupButtonID="calendarIMG_2" runat="server">
                    </cc1:CalendarExtender>
                    <cc1:TextBoxWatermarkExtender ID="TextBoxWatermarkExtender2" TargetControlID="tb_endDate" WatermarkCssClass="watermarked" WatermarkText="(mm dd yyyy)" runat="server">
                    </cc1:TextBoxWatermarkExtender><br/>                     
                    <asp:Label ID="lbl_errorMsg_endDate" runat="server" ForeColor="Red"></asp:Label>                    
            	</td>
            </tr>
            <tr>
            	<th>&nbsp;</th>
                <td>
                	<asp:DropDownList ID="ddlDateFromAmt" runat="server">
                        <asp:ListItem Value="0">Full Day</asp:ListItem>
                        <asp:ListItem Value="1">Half Day (AM)</asp:ListItem>
                        <asp:ListItem Value="2">Half Day (PM)</asp:ListItem>
                    </asp:DropDownList>
                </td>
            </tr>
            <tr>
            	<th>No.Of Days</th>
            	<td>                    
                    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                    <ContentTemplate>
                    <asp:Label ID="lbl_numDays" runat="server"></asp:Label>            	
                    </ContentTemplate>
                    <Triggers>
                        <asp:AsyncPostBackTrigger ControlID="tb_startDate" 
                            EventName="TextChanged" />
                             <asp:AsyncPostBackTrigger ControlID="tb_enddate" 
                             EventName="TextChanged" />
                    </Triggers>
                    </asp:UpdatePanel>
            	</td>
            </tr>            
            <tr>
            	<th>Approver</th>
            	<td>
            	    <asp:Label ID="lbl_approver" runat="server"></asp:Label>
            	</td>
            </tr>
            <tr>
            	<th>Remarks<br/>(optional)</th>
            	<td>
                    <asp:TextBox ID="tb_remarks" runat="server" Columns="30" Rows="10" TextMode="MultiLine"></asp:TextBox>                    
                </td>            	
            </tr>            
          </table>
 
code behind
============
//funtion that will calculate the number of days and reflect the value in the label
protected void CalculateNumberOfDays()
    {
        DateTime startTime, endTime;
 
        if (DateTime.TryParse(tb_startDate.Text.ToString(), out startTime) == false)
        {
 
            lbl_errorMsg_startDate.Text = "Please select a valid start date.";
 
            return;
 
        }
 
        if (DateTime.TryParse(tb_endDate.Text.ToString(), out endTime) == false)
        {
 
            lbl_errorMsg_endDate.Text = "Please select a valid end date.";
 
            return;
 
        }
 
        if (DateTime.Compare(startTime, endTime) > 0)
        {
 
            lbl_errorMsg_startDate.Text  = "Please select a valid date range.";
            lbl_errorMsg_endDate.Text =  "Please select a valid date range.";
 
            return;
 
        }
 
        if (int.Parse(ddlDateFromAmt.SelectedValue.ToString()) == 0)
        {           //reflect the calculated num of days to the label
            lbl_numDays.Text = Weekdays(startTime, endTime).ToString();
 
        }
        else
        {                    
 
            lbl_numDays.Text = Weekdays(startTime).ToString();
 
        }
    }
 
    int Weekdays(DateTime dtmStart, DateTime dtmEnd)
    {
 
        try
        {
 
            // This function includes the start and end date in the count if they fall on a weekday
 
            int dowStart = ((int)dtmStart.DayOfWeek == 0 ? 7 : (int)dtmStart.DayOfWeek);
 
            int dowEnd = ((int)dtmEnd.DayOfWeek == 0 ? 7 : (int)dtmEnd.DayOfWeek);
 
            TimeSpan tSpan = dtmEnd - dtmStart;
 
            if (dowStart <= dowEnd)
            {
 
                return (((tSpan.Days / 7) * 5) + Math.Max((Math.Min((dowEnd + 1), 6) - dowStart), 0));
 
            }
 
            else
            {
 
                return (((tSpan.Days / 7) * 5) + Math.Min((dowEnd + 6) - Math.Min(dowStart, 6), 5));
 
            }
 
        }
 
        catch (Exception ex)
        {
 
            throw new Exception(ex.Source.ToString() + ":" + ex.Message.ToString() + ":" + ex.InnerException.ToString());
 
        }
 
    }
 
    double Weekdays(DateTime dtmStart)
    {
 
        try
        {
 
            // This function includes the start if they fall on a weekday
 
            if ((int)dtmStart.DayOfWeek == 6 || (int)dtmStart.DayOfWeek == 7)
 
                return 0.0;
 
            else
 
                return 0.5;
 
        }
 
        catch (Exception ex)
        {
 
            throw new Exception(ex.Source.ToString() + ":" + ex.Message.ToString() + ":" + ex.InnerException.ToString());
 
        }
 
 
 
    }

                                  
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Asked On
2009-10-12 at 09:25:55ID24805022
Tags

ASP.net

Topics

Programming for ASP.NET

,

.NET Framework 2.x

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: burakiewiczPosted on 2009-10-12 at 09:56:09ID: 25552831

i think you need to add the handler for the text changed so it fires
ontextchanged="TextBox1_TextChanged" and just have an empty handler in the code behind

 

by: burakiewiczPosted on 2009-10-12 at 09:57:39ID: 25552839

more spcifically to
<asp:TextBox ID="tb_endDate"

 

by: jazz__manPosted on 2009-10-12 at 10:52:38ID: 25553386

Hi

I have set up an example that does pretty much the same functionality I think you are trying to achieve

Here is the markup

<form id="form1" runat="server">
   <div>
       <asp:ScriptManager ID="ScriptManager1" runat="server" />
       
       
       <asp:TextBox ID="txtCalTest" runat="server"
            ontextchanged="txtCalTest_TextChanged" AutoPostBack="True"></asp:TextBox>
       <cc1:CalendarExtender ID="calTest" runat="server" TargetControlID="txtCalTest">
       </cc1:CalendarExtender>
       
       <br />
       <br />

       <asp:UpdatePanel ID="UpdatePanel1" runat="server">
       <ContentTemplate>
       <asp:Label ID="lblCalChanged" runat="server" Text=""></asp:Label>

       </ContentTemplate>
       
       <Triggers>
       <asp:AsyncPostBackTrigger ControlID="txtCalTest" EventName="TextChanged"/>
       
       </Triggers>
       </asp:UpdatePanel>
       
       

   </div>
   </form>


And the code behind......


protected void txtCalTest_TextChanged(object sender, EventArgs e)
       {
           lblCalChanged.Text = "CalanderChanged to " + txtCalTest.Text;
       }


Hope this helps

cheers



20120131-EE-VQP-002

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