How to retrieve a dynamic textbox's text then update other C#?

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Hi,

In c# asp.net web app,
I dynamically create a table and textboxes in cell on each table row.

My question is

1. How can I use textchanged to find the text in one textbox base on the textbox ID?

2. How can I update another textbox on the same row base on the first textbox value?

I tried to google it for the whole day but have no luck, thanks in advance.

ZD

What I have tried:

C#

private void GenerateTable(int numOfColumns, int numOfRows,  Table tb)
    { 

for (int i = 0; i < numOfRows; i++)
            {
                TableRow row = new TableRow();
                row.Width = new Unit("100%");
                

                for (int j = 0; j < numOfColumns; j++)
                {
                    TableCell cell = new TableCell();

                        TextBox tb = new TextBox();

                        // Set a unique ID for each TextBox added
                        tb.ID = "Row_"+ i + "Col_" + j;
                        tb.Text = "";
                            tb.TextChanged += new EventHandler(textBox_TextChanged);

                        cell.Controls.Add(tb);

                    
                    }


tb.Rows.Add(row);
}
}


    private void textbox_TextChanged(object sender, EventArgs e)
    {
        TextBox tb = (TextBox)FindControl("Row_0Col_0");
        Response.Write(tb.Text);
// I cannot even retrieve the text

    }

Posted 7-Jul-16 15:37pm

Member 12194656

Updated 8-Jul-16 9:45am

Karthik_Mahalingam

v5

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Comments

Karthik_Mahalingam 8-Jul-16 1:38am

use javascript for this.

F-ES Sitecore 8-Jul-16 4:27am

Do you call GenerateTable on every postback?

Member 12194656 8-Jul-16 13:19pm

Hi, Yes I do, but I got 'multiple IDs' message now, please see below. Thanks again.

2 solutions

Solution 2

Thank you all.

I figure it out base on all the advice here. Have a nice weekend!

Posted 8-Jul-16 9:45am

Member 12194656

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Nayan Ambaliya · Accepted Answer · 2016-07-07T19:46:00

Hi,

You will need to set autopostback property of the textbox as "True" and bind an event handler to the dynamically generated textbox.

Suppose you add textbox like this;

C#

TextBox t = new TextBox();
t.ID = i.ToString();
t.TextChanged += new EventHandler(t_TextChanged);
t.AutoPostBack = true;
this.pnl.Controls.Add(t);

Then you add an event handler for the dynamically generated textbox as;

C#

TextBox t = (TextBox)sender;
string textvalue = t.Text;
Response.Write("Textbox with id: " + t.ID + " event called<br>");
</br>

Hope this helps.