How to calculte a zero for a textbox text change if zero is already there?

Question

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I have a web form that has a couple for textboxes on it. Right now I have a zero in these textboxes.

ASP.NET

<asp:TextBox ID="TextBoxTNUGSC" runat="server" Width="180px" 
                    style="text-align: right" AutoPostBack="True" 
                    ontextchanged="TextBoxTNUGSC_TextChanged">0</asp:TextBox>

Here is the textbox text change:

C#

protected void TextBoxTHUG_TextChanged(object sender, EventArgs e)
    {
        int i = Convert.ToInt32(TextBoxTHUG.Text.Replace(",", ""));
        int j = 12;
        TextBoxTHUGDR.Text = Convert.ToString(i / j);

        int a = Convert.ToInt32(TextBoxFTUG.Text.Replace(",", ""));
        int b = Convert.ToInt32(TextBoxFTG.Text.Replace(",", ""));
        int c = Convert.ToInt32(TextBoxTHUGDR.Text.Replace(",", ""));
        int d = Convert.ToInt32(TextBoxTHGDR.Text.Replace(",", ""));
        TextBoxT1234.Text = Convert.ToString(a + b + c + d);

        int g = Convert.ToInt32(TextBoxT1234.Text.Replace(",", ""));
        int f = Convert.ToInt32(TextBoxNCCDR.Text.Replace(",", ""));
        TextBoxTCNC.Text = Convert.ToString(g + f);

When a user comes into the web form they will see the zeros there in the textboxes. In order for the textbox textchange to work they will have to enter another 0 that will now display 00 in the textbox. How can I get the textbox textchange to fire if the user has nothing to enter into those textboxes?

Posted 11-Nov-14 3:45am

Computer Wiz99

Updated 11-Nov-14 7:33am

v3

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Comments

ZurdoDev 11-Nov-14 9:55am

Either start with the textboxes as empty and let them enter 0 or figure a different way to post back the data, perhaps allowing them to fill in all textboxes and then clicking a button.

Computer Wiz99 11-Nov-14 9:58am

There is a problem with that. When the web form loads there are validators that load with it. Errors will show up before the form even loads completely.

ZurdoDev 11-Nov-14 10:01am

I'm not sure what validators you are using but a validator shouldn't show until the form tries to post back.

Computer Wiz99 11-Nov-14 10:09am

Range Validators. What I want to do and tring to do is to show the zeros when the web form loads but disappear when the user enters a value. Is there a way to do this in C#?

ZurdoDev 11-Nov-14 10:10am

You may want to look into watermark for textboxes.

Computer Wiz99 11-Nov-14 10:15am

I did that part but still will need to have a value when the page loads.

ZurdoDev 11-Nov-14 10:15am

But again, why are your validators firing when the page loads. They should only fire when something changes or when the form is submitted.

Computer Wiz99 11-Nov-14 10:31am

I have them in Page Load to check the values of the data that is populated.

Sergey Alexandrovich Kryukov 11-Nov-14 10:43am

"Has nothing to enter" is not any event. If the use "has nothing to enter" and just staring at the screen, are you going to detect it? :-)
Maybe your question still makes some sense, but you have to explain it.
—SA

Computer Wiz99 11-Nov-14 10:49am

Ok, When the user enter the form the textboxes has zeros in them already. The user has to enter their data into the textboxes. When they come to a textbox that has a zero in it and they have no data to enter into that textbox the text change does not work. Only time it works is when the user enters zero twice and then goes to the next textbox. How can I get the text change to work if a user has nothing to enter into that textbox that has the text change on it?

Sergey Alexandrovich Kryukov 11-Nov-14 12:50pm

Please describe the event you are interested in, from the user input standpoint. You need to do something — when? When a user hits Enter, tries to enter some character — what? "Nothing to enter" is also some enter; the user needs to indicate that somehow. Or do you want some advice on UI design?
—SA

Sergey Alexandrovich Kryukov 11-Nov-14 12:50pm

Please describe the event you are interested in, from the user input standpoint. You need to do something — when? When a user hits Enter, tries to enter some character — what? "Nothing to enter" is also some enter; the user needs to indicate that somehow. Or do you want some advice on UI design?
—SA

Computer Wiz99 11-Nov-14 13:31pm

What I am trying to do is to do the calculation for the textbox text change if the user only enters zero. I have uploaded my code for the calculations.

AnvilRanger 11-Nov-14 11:33am

The values that are being loaded really should not have to be validated on page loads. I would assume you are retrieving this data from a location such as sql or a service. Just validate the data on form save or submission.

Computer Wiz99 11-Nov-14 12:52pm

I have a question. Is there a way for me to do a calculation just by entering zero if there is a zero in the textbox for the textbox text change?

AnvilRanger 11-Nov-14 13:32pm

If there is already a 0 in the box no. Because what is happening if there is a 0 in the box and they just tab over it or highlight it and set it to 0 there is really no text change happening.

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OriginalGriff · Answer 1 · 2014-11-11T08:13:00

Solution 1

The clue is in the event name: "TextChanged"
It is intended to fire only when the text changes, and there is no good way to make it fire under other circumstances.

Instead, consider handling the Leave event and doing your processing there. You get Leave when the user tries to move out of the control - which should work whether the user changed anything or not.

Posted 11-Nov-14 8:13am

OriginalGriff

Comments

Kornfeld Eliyahu Peter 11-Nov-14 14:44pm

Just note that while TextChanged event is handled on the server side (in OP's case at least) the 'Leave' event is exists only on the client side, at the JavaScript level - it called blur!!!

BacchusBeale · Answer 2 · 2014-11-11T13:21:00

Based on the code, provided wouldn't you initialise the fields when it is first loaded by overriding the Page Load function? Is this what you were looking for?

C#

void OnLoad()
{
    updateText(0, 0, 0);
}

void updateText(int i, int abcd, int gf)
{
    int j = 12;
    TextBoxTHUGDR.Text = Convert.ToString(i / j);
    TextBoxT1234.Text = Convert.ToString(abcd);
    TextBoxTCNC.Text = Convert.ToString(gf);
}


protected void TextBoxTHUG_TextChanged(object sender, EventArgs e)
{
        int i = Convert.ToInt32(TextBoxTHUG.Text.Replace(",", ""));

        int a = Convert.ToInt32(TextBoxFTUG.Text.Replace(",", ""));
        int b = Convert.ToInt32(TextBoxFTG.Text.Replace(",", ""));
        int c = Convert.ToInt32(TextBoxTHUGDR.Text.Replace(",", ""));
        int d = Convert.ToInt32(TextBoxTHGDR.Text.Replace(",", ""));

        int g = Convert.ToInt32(TextBoxT1234.Text.Replace(",", ""));
        int f = Convert.ToInt32(TextBoxNCCDR.Text.Replace(",", ""));

        updateText(i, a+b+c+d, g+f);

}