html输入按钮服务器单击事件未触发

Question

I have the following code inside the CS file of the page, i am trying to add an html button inside a div in the server side to close the alert modal dialog. When I add the event to the button and try to fire it. The event doesn't fires. So, where is the problem ?

 public Alert(HtmlGenericControl alert ,string alertMessage) { vAlert = alert; alert.Attributes.Add("class", "uk-modal"); alert.Attributes.Add("aria-hidden", "true"); alert.Attributes.Add("style", "display: none; overflow-y: scroll;"); HtmlGenericControl innerDiv = new HtmlGenericControl(); innerDiv.TagName = "div"; innerDiv.Attributes.Add("class", "uk-modal-dialog"); innerDiv.Attributes.Add("style", "top: 35.5px;text-align:center; padding:30px;"); HtmlInputButton btnclose = new HtmlInputButton(); btnclose.Attributes.Add("type", "button"); btnclose.Attributes.Add("id", "alert_close"); btnclose.Attributes.Add("runat", "server"); btnclose.Attributes.Add("class", "uk-modal-close uk-close"); btnclose.Attributes.Add("style", "padding:15px;"); btnclose.ServerClick += new EventHandler(btnclose_ServerClick); innerDiv.Controls.Add(btnclose); HtmlGenericControl p = new HtmlGenericControl(); p.TagName = "p"; p.InnerText = alertMessage; innerDiv.Controls.Add(p); alert.Controls.Add(innerDiv); ShowAlert(alert); } private void btnclose_ServerClick(object sender, EventArgs e) { HideAlert(vAlert); } 

Can you help me ?

Answer 1

The button probably doesn't exist at the time when the server callback is executing.

You are using a dynamically created button. In order for it to be able to trigger a server side method, the button needs to be added and have it's event handler bound in an early stage of the page life cycle, such as On_Init.

We don't know when you call your "Alert" method, but it might very well too late. It also needs to be called on every postback - or the link between button and handler won't be there when the button causes a postback.