ASP.NET - Event handler of programmatically-created button never invoked

Question

So i need to write simple "Minesweeper" game in asp.net (Only for learning purposes - it should be almost only javascript but anyway...)

I'm creating the game board dynamically at PageLoad, by creating a Table when each TableCell contains an ImageButton.

When i create each button, i'm adding to it's Click event my own event handler:

cellButton.Click += new EventHandler(tryOpenCell);

When i'm running the project, the game page loading exactly as expected, but when i click on any cell (which is an ImageButton as i said) the request goes back to the server code, but the button's Event Handler never invoked. Instead, the whole process just repeat itself, means regenerating the whole table game.

So my question is why my event handler never invoked?

Off The Gold · Accepted Answer · 2016-02-17 16:48:57Z

2

On Postback your button should be recreated and then it will handle the event..

protected void Page_Load(object sender, EventArgs e)
{
        ImageButton btn = new ImageButton();
        btn.ID = "Btn";
        btn.Click += new EventHandler(tryOpenCell);
        form1.Controls.Add(btn);
 }

Your button should be recreated in the page load event, before it can handle the event handler.

edited Feb 17, 2016 at 16:48

Off The Gold

1,23615 silver badges28 bronze badges

answered May 17, 2011 at 8:34

Muhammad Akhtar

52.2k37 gold badges142 silver badges191 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Avi Shukron Over a year ago

I guess that the most important thing is to specify the same ID when originally creating the button and at postback?

Muhammad Akhtar Over a year ago

Your button should be recreated in page load event, before it handle the event hanlder. I have tested this thing at my end. As you know normally when you click button, page load event called before click event handler.

Avi Shukron Over a year ago

Thanks! i think i had a gap in the matter of how event-deriven programming works on ASP.Net. Now it makes more sense.

Collectives™ on Stack Overflow

ASP.NET - Event handler of programmatically-created button never invoked

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related