Dynamically generated textboxes and their values

Frode · April 14th, 2006, 10:39 AM

Hi,

I have some Textbox controls on my page that are generated by a for-loop for each tuple from a database. Their IDs are textboxX where X is the counter from the for-loop.

Now, I activated postback for the textboxes, so that when the user changes the value in one of them, the page does a postback.

To handle the values from the postback, I test Page.IsPostBack. If this test is true, I want to use the new value (from the textbox that did the postback) to ie update the database. So far, I just loop through all the textboxes and update all the values (since I can't find out which control did the postback).

Code:

if (Page.IsPostBack) 
{
    for (int i = 0; i < nAmountOfTextBoxes; i++)
    {
        int value;   // value from textbox
        try
        {
            value = int.Parse(((TextBox)myPanel.FindControl("textbox" + i.ToString())).Text);
        }
        catch
        {
            // Couldn't parse
            value = -1;
        }

        if (value >= 0)
        {
            deportToSiberia(value);// do something with the value
        }
    } // end for
}

This doesn't work. I didn't really expect it to, but I don't know any other way to go about with it. How can I fetch the values from a postback in my code? Any help is greatly appreciated.

Thanks,
Frode

Frode · April 17th, 2006, 03:46 PM

Found a solution. In case anyone stumbles upon this thread wondering the same thing, here it is (in short):

In the Page_Init I added all the textboxes. I checked !Page.IsPostBack each time to see if the values from the database should be loaded.

In the Page_Load I looped through each control in the panel with

Code:

if(Page.IsPostBack) 
{
    foreach( Control c in myPanel.Controls )
    {
        if( c.GetType().ToString().Equals("System.Web.UI.WebControls.TextBox") )
        {
            TextBox t = (TextBox)c;
            deportToSiberia(t.Text); // Do something with the value from the postback
        }

    } // end for
} // end postback check

This article helped me a lot http://aspnet.4guysfromrolla.com/articles/092904-1.aspx