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This article mainly introduces "how to realize the server events caused by the loss of focus of c # textbox". In the daily operation, I believe that many people have doubts about how to realize the server events caused by the loss of focus of c # textbox. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods, hoping to help you answer the doubts of "how to realize the server events caused by the loss of focus of c # textbox". Next, please follow the editor to study!

In Web applications, we often use a lot of c # textbox to lose focus to process input information.

Before the page is submitted, when c # textbox loses focus, it may be necessary to process the information we entered.

For example:

1. Check the input information

2. Different processing of the information to be entered later according to the input information.

3. You need to go back to the server for processing.

Wait a minute.

Based on these requirements! Just add the server event of OnBlur to c # textbox when it loses focus!

The server will automatically generate an event like the root onclick

This.MyTextBox.OnBlur + = new System.EventHandler (this.MyTextBox_OnBlur)

The main thing about this control is that it inherits TextBox and IPostBackEventHandler interface! Just make the OnBlur events public!

The complete code is as follows:

Using System; namespace Region.Controls {public class PostBackTextBox: System.Web.UI.WebControls.TextBox,System.Web.UI.IPostBackEventHandler {protected override void Render (System.Web.UI.HtmlTextWriter writer) {Attributes ["onblur"] = Page.GetPostBackEventReference (this); base.Render (writer);} public event EventHandler OnBlur; public virtual void RaisePostBackEvent (string eventArgument) {if (OnBlur! = null) {OnBlur (this, null) }} at this point, the study on "how to realize the server events caused by the loss of focus of c # textbox" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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