problem implementing calender without using jquery

Question

0.00/5 (No votes)

See more:

I have a calender with dropdowndown list to select month and year.

i didnt use jquery. I dont have any error but the page gets reloaded whenevr i click month, year from dropdown and date from calender.  though values are corrected added reloading is disturbing. what should be done to to stop this?  pls help in  code.

Aspx code:

HTML

XML

<tr>
                       <td>
                            <asp:Label ID="lblExpiry" Font-Bold="true" Font-Size="Larger" runat="server">Expiry</asp:Label>
                       </td>
                       <td>
                                <asp:TextBox runat="server" ID="txtExpiry" />
                       </td>
                      <td>
                           <asp:ImageButton ID="ImageButton2" runat="server" ImageUrl="~/Images/cal.jpg" Height="33px" OnClick="ImageButton2_Click" Width="38px" /></td>
                       <td>
                            <asp:RequiredFieldValidator ID="reqvalExpiry" runat="server" ValidationGroup="valStent" ControlToValidate="txtExpiry"
                                    CssClass="field-validation-error" ErrorMessage="The Expiry field is required." />
                       </td>
                   </tr>
                   <tr>
                        <td>
                       <asp:DropDownList runat="server" ID="ddlMonth" AutoPostBack="true" OnSelectedIndexChanged="Set_Calendar">
    <asp:ListItem Text="January" Value="1" />
    <asp:ListItem Text="February" Value="2" />
    <asp:ListItem Text="March" Value="3" />
    <asp:ListItem Text="April" Value="4" />
    <asp:ListItem Text="May" Value="5" />
    <asp:ListItem Text="June" Value="6" />
    <asp:ListItem Text="July" Value="7" />
    <asp:ListItem Text="August" Value="8" />
    <asp:ListItem Text="September" Value="9" />
    <asp:ListItem Text="October" Value="10" />
    <asp:ListItem Text="November" Value="11" />
    <asp:ListItem Text="December" Value="12" />
</asp:DropDownList>

<asp:DropDownList runat="server" ID="ddlYear" AutoPostBack="true" OnSelectedIndexChanged="Set_Calendar">
    <asp:ListItem Text="2011" Value="2011" />
    <asp:ListItem Text="2012" Value="2012" />
    <asp:ListItem Text="2013" Value="2013" />
    <asp:ListItem Text="2014" Value="2014" />
    <asp:ListItem Text="2015" Value="2015" />
</asp:DropDownList>
                            </td>
                   </tr>
                   <tr>
                       <asp:Calendar ID="Calendar2" runat="server" OnSelectionChanged="Calendar2_SelectionChanged" Font-Size="XX-Small">
                           <TodayDayStyle BackColor="#003366" />

                       </asp:Calendar>
                   </tr>

Code behind:

HTML

C#

protected void Page_Load(object sender, EventArgs e)
        {


            Calendar2.Visible = false;
            //ddlMonth.Visible = false;
            //ddlYear.Visible = false;
            Populate_MonthList();
            Populate_YearList();

            txtExpiry.Enabled = false; }
<pre> protected void ImageButton2_Click(object sender, ImageClickEventArgs e)
        {
            txtExpiry.Enabled = true;
            ddlMonth.Visible = true;
            ddlYear.Visible = true;
            Calendar2.Visible = true;
        }
        protected void Populate_MonthList()
        {
            //Add each month to the list
            var dtf = System.Globalization.CultureInfo.CurrentCulture.DateTimeFormat;
            for (int i = 1; i &lt;= 12; i++)
                ddlMonth.Items.Add(new ListItem(dtf.GetMonthName(i), i.ToString()));

            //Make the current month selected item in the list
            ddlMonth.Items.FindByValue(DateTime.Now.Month.ToString()).Selected = true;
        }


        protected void Populate_YearList()
        {
            //Year list can be changed by changing the lower and upper
            //limits of the For statement
            for (int intYear = DateTime.Now.Year - 20; intYear &lt;= DateTime.Now.Year + 20; intYear++)
            {
                ddlYear.Items.Add(intYear.ToString());
            }

            //Make the current year selected item in the list
            ddlYear.Items.FindByValue(DateTime.Now.Year.ToString()).Selected = true;
        }

        protected void Set_Calendar(object Sender, EventArgs e)
        {
            int year = int.Parse(ddlYear.SelectedValue);
            int month = int.Parse(ddlMonth.SelectedValue);
            Calendar2.TodaysDate = new DateTime(year, month, 1);
        }

        protected void Calendar2_SelectionChanged(object sender, EventArgs e)
        {
            txtExpiry.Text = Calendar2.SelectedDate.ToShortDateString();
            Calendar2.Visible = false;
        }
    }

Posted 2-Mar-15 23:19pm

Member 11377180

Updated 2-Mar-15 23:45pm

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Raul Iloc · Answer 1 · 2015-03-03T00:18:00

Solution 1

1.Note that each time you click on a control that could generate post-back, in your case buttons or drop down lists, the code behind events are executed, and Load event is always executed.

2.You should separate the two main cases than may occur in the management of your event from your code: first invocation, post back invocation. For doing this you should modify your Load event handler like below:

C#

protected void Page_Load(object sender, EventArgs e)
{
     if(!IsPostBack())
     {    
            Calendar2.Visible = false;
            Populate_MonthList();
            Populate_YearList();
            txtExpiry.Enabled = false; 
     }
}

Posted 3-Mar-15 0:18am

Raul Iloc

Updated 3-Mar-15 0:19am

v3

Comments

Member 11377180 3-Mar-15 8:27am

inspite of trying this its still reloading.
protected void Page_Load(object sender, EventArgs e)
{
if(!this.IsPostBack)
{
Calendar2.Visible = false;
Populate_MonthList();
Populate_YearList();
txtExpiry.Enabled = false;
}
}

Raul Iloc 4-Mar-15 1:33am

Each control that has AutoPostBack set on true will generate a postabck, this means that on click/select the entire page will be sent to the web server, and web server will process the events, re-render the page and finally the resulted HTML + CSS will be send back to the browser, and the browser will re-draw the page. To refine/improve this normal behaviour you should/could use AJAX and/or take care in using AutoPostBack properties. Also in the event handler you should manage the 2 cases (IsPostBack true or false) like I suggested in my solution above.