passing a response.write value to a label

[dougancil]

I have the following subroutine:

 Public Sub StartTimeDif()
        Dim dt As DateTime = Convert.ToDateTime(starttimeInput.Text)
        Dim dt1 As DateTime = Convert.ToDateTime(endtimeInput.Text)
        Dim ts As TimeSpan = dt1.Subtract(dt)
        Response.Write(ts.Minutes)
    End Sub

and I'm trying to pass (ts.minutes) to durationLabel. Can anyone offer me a solution to that.

Thank you

Doug

[Frinavale]

If you have a "durationLa bel" on your ASPX page:

<asp:Label ID="durationLabel" runat="server" />

Then you can set it's Text property in code:

Public Sub StartTimeDif()
   Dim startTime As DateTime    
   Dim endTime As DateTime 
   If DateTime.TryParse(starttimeInput.Text, startTime) AndAlso _
      DateTime.TryParse(endtimeInput.Text, endTime) Then
        Dim ts As TimeSpan = endTime - startTime
        durationTime.Text = ts.Minutes.ToString()
   Else
        durationTime.Text = "Start Time or End Time value is invalid"
   End If
End Sub

-Frinny

[dougancil]

Frinny,

What if I wanted to have that value show up in a popup window that would allow a user to select yes or no and then if they selected yes, it submits the information to the sql server and if they select no it takes them back to the web page to re-enter data.

Thank you

[Frinavale]

Then you need to implement JavaScript that will do that.
This will not be done in your C# code.

Use a JavaScript confirm popup box.

[dougancil]

Frinny,

Ok so if I use this:

<input type="button" onclick="show_confirm()" value="Confirm" />
<script type="text/javascript">
function show_confirm()
{
var r=confirm (ts.Minutes.ToString();
if (r==true)
  {
  alert("You pressed OK!");
  }
else
  {
  alert("You pressed Cancel!");
  }
}
</script>

and want to fire off my insetrow() sql command, how do I call that from the javascript when the user presses ok?

    Protected Sub Button_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button.Click
        StartTimeDif()
        InsertRow()
    End Sub

[Frinavale]

Check out this article on How to use JavaScript in ASP.NET.

It explains how you can use JavaScript to prevent ASP.NET buttons from posting back to the server.

-Frinny

[dougancil]

Frinny,

I'm reading the article and trying to reproduce what you did so that I can understand it more and I've copied your code as you have it written, except that mines not referencing a master page and in my subroutine for the CreateHelloWorl dJavaScript() on line 7, I'm getting "Name Confirm is not declared."

[Frinavale]

Where did you place this code?

Please copy&paste exactly what you have.
It sounds like you're missing a double quote or something.

-Frinny

[dougancil]

I'll post my code in my next reply but I also wanted to say that I tested the code that I have for passing the response to my label and I'm not seeing anything in my label. Here's the code that I have for it:

 Public Sub StartTimeDif()
        Dim startTime As DateTime
        Dim endTime As DateTime
        If DateTime.TryParse(starttimeInput.Text, startTime) AndAlso _
           DateTime.TryParse(endtimeInput.Text, endTime) Then
            Dim ts As TimeSpan = endTime - startTime
            durationLabel.Text = ts.Minutes.ToString()
        End If
    End Sub
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        InsertRow()
        StartTimeDif()
    End Sub

I took your error out until I figure out what's causing this to not display at all. Can you see what I may be missing?

Thank you

Doug

[Frinavale]

Maybe you didn't enter the if block.

Try this:

 Public Sub StartTimeDif()
        Dim startTime As DateTime
        Dim endTime As DateTime
        If DateTime.TryParse(starttimeInput.Text, startTime) AndAlso _
           DateTime.TryParse(endtimeInput.Text, endTime) Then
             Dim ts As TimeSpan = endTime - startTime
             durationLabel.Text = ts.Minutes.ToString()
        Else
             durationLabel.Text = "The start-time or end-time value provided was invalid. It could not be converted into a DateTime type."
        End If
    End Sub

[dougancil]

I entered the if block but the regular expression validator is supposed to catch if someone doesnt enter the data correctly. When someone enters a starttime and endtime, it's posting correctly to the database, but for whatever reason, it's not showing it in the label. A user will enter the starttime as 11:00 pm and the end time as say 11:15 pm , to me that's already a datetime format. I'm missing something but I have no idea what.

[Frinavale]

• Make a new project.
• Add the starttimeInput and endtimeInput TextBoxes to the page.
• Add a button to the page
• Add the durationLabel to the page
• In the VB.NET Code:
  • Add the StartTimeDif() method to the code
  • Implement a method that handles the button's Click event and call the StartTimeDif() method.
• Try using the program.

[dougancil]

It works as a "standalone " and I'm not quite sure what's causing that failure. Also, if I want to find out both minutes and hours, between starttime and endtime, what kind of equation should I use? Obviously, it can't be just ts.minutes.toSt ring()

[Frinavale]

Well the TimeSpan (the ts variable) has all of that information...

[dougancil]

Frinny,

Ok I figured out what to do with the hours and minutes but what I'm not understanding is whenever I enter any digits and then press submit, I'm getting this error:

System.FormatEx ception: String was not recognized as a valid DateTime.

If I have this as a "stand alone" web page it works just fine. I removed the validation from the text boxes thinking that this may have something to do with it but I'm still getting this error. Do you have any other ideas as to what it may be?

Thanks

Doug