Why is my ASP.NET Button control not calling the appointed function? - asp.net

Question

I want to set up a search functionality on my web site. The user types some information into a text box and click a search button. Upon clicking the search button, a database is searched using the text in the text box, and the results are displayed in a table. If the text in the text box matches one result from the database perfectly, rather than displaying a list of results the page is populated with detailed information about the matching result.
In order to make it easier to match a result exactly, I want to add a button next to each result which "selects" that result, filling the text box with that result's text and therefore populating the page with the details. Here's what I have.
Upon clicking the search button, after the check to see if a result is matched exactly, I create a table which contains the results and the buttons:
for(int x=0; x < res_list.Length; x++)
{
TableRow newRow = new TableRow();
TableCell textCell = new TableCell();
TableCell buttonCell = new TableCell();
buttonCell.ID = "bc" + x;
Button cellButton = new Button();
cellButton.ID = "btn" + x;
textCell.Text = res_list[x];
textCell.Attributes.Add("Width","60%");
cellButton.Text = x.ToString();
// cellButton.OnClientClick = "NameClick"; This property refers to client-side scripts, which I am not using.
cellButton.Click += new EventHandler(NameClick);
buttonCell.Controls.Add(cellButton);
newRow.Cells.Add(firstCell);
newRow.Cells.Add(buttonCell);
myTable.Rows.Add(newRow);
}
I have tried both the OnClientClick method and the Click method seen above, both of which have yielded the same results.
My NameClick function is as follows:
void NameClick(object sender, EventArgs e)
{
Button sendButton = (Button)sender;
int index = Int32.Parse(sendButton.Text);
SearchTextBox.Text = myTable.Rows[index].Cells[0].Text;
return;
}
I set up a breakpoint at the beginning of the NameClick function, and when I click one of these buttons it is never reached. Why is this function not being called by my buttons?
EDIT: I want to accomplish this without using JavaScript, if possible.

Answer 1

You use cellButton.OnClientClick = "NameClick";, but do you actually have a NameClick function in your javascript? If not, clicking the button will cause a JS error which will probably block the postback.
Other than that, it is advisable to assign explicit ID's to controls which you create programatically. Otherwise the autogenerated ID's may change on postback, which will prevent control events from firing.
Something like the following should work (not tested):
myTable.ID = "someid";
for (int x=0; x < res_list.Length; x++)
{
TableRow newRow = new TableRow();
newRow.ID = "r" + x;
TableCell textCell = new TableCell();
TableCell buttonCell = new TableCell();
buttonCell.ID = "bc" + x;
Button cellButton = new Button();
cellButton.ID = "btn" + x;
textCell.Text = res_list[x];
textCell.Attributes.Add("Width","60%");
cellButton.Text = x.ToString();
//cellButton.OnClientClick = "NameClick"; // not needed unless you have actual JS for it
cellButton.Click += new EventHandler(NameClick);
buttonCell.Controls.Add(cellButton);
newRow.Cells.Add(firstCell);
newRow.Cells.Add(buttonCell);
myTable.Rows.Add(newRow);
}

Answer 2

cellButton.OnClientClick should point to a client-side function, i.e. JavaScript. Do you have a JS function somewhere?
If the answer is no, then we've found your problem. You should create one. It will be helpful to set your ClientIDMode property of your dynamically generated controls to Static or Predictable, so your JS function can easiliy access them.
Do you need assistance with the JS function?

Answer 3

when you click on the button, the page start the life cycle again and your control Does not exist in the page you need to create the control again or save it in the viewstate or use control state
when he call back in the life cycle
in the page life cycle event SaveControlState, loadControlState
if you want to create a javascript click event you need to make sure that the control doesnt call to server side event for this in the javascript function you need to return false

Answer 4

you have to add this event in your asp syntax for button.
<asp:Button runat="server " OnClick="ButtonClick"/>