Analysis of ASP. NET carriage return submission events

The ASP. NET carriage return submission event is not a programming problem of ASP. NET, but a detailed discussion about how to plan the submit button in HTML form. It can also be attributed to a part of ASP. NET programming. What is the specific implementation of ASP. NET carriage return event submission? Let's take a look at the following:

ASP. NET press ENTER submit event Implementation 1,

When the focus of your cursor enters a form element, the first button in the form (flow layout follows left to right, top to bottom) type = submit (if any) will be activated ), wait for the response to the carriage return event and submit the form

You can test the Code:

 
 

  
  
﹤form action=""﹥   
  
  
﹤input type="text" /﹥   
  
  
﹤input type="submit" value="submit" /﹥   
  
  
﹤/form﹥   
  
  
﹤form action=""﹥   
  
  
﹤input type="text" /﹥   
  
  
﹤input type="button" value="submit" /﹥   
  
  
﹤/form﹥ 
 
 

ASP. NET press ENTER submit event implementation 2.

In ASP. in NET 2.0, the button is rendered as <input type = submit> by default. At this time, no additional script is required to submit the form, the submit button is designed to be used to submit a form. In 1.x, it is displayed as <input type = button onclick = _ dopostback (...) /> this normal button does not have the above default behavior of submit

ASP. NET press ENTER submit event Implementation 3. disable this default behavior with method 2

(1) set the defualtbutton of the form element as follows:

 
 

  
  
﹤form id="form1"   
  
  
 
  
  
runat="server"   
  
  
 
  
  
defaultbutton="Button1"﹥   
 
 

Pay attention to defaultbutton = <targetbutton. ID>. Therefore, the buttons in the composite control such as the template may be invalid (not tested)

(2) modify the button Rendering Method usesubmitbehavior = "false"

 
 

  
  
﹤asp:Button ID="Button1"   
  
  
 
  
  
runat="server" Text="Button"   
  
  
 
  
  
onclick="Button1_Click"   
  
  
 
  
  
UseSubmitBehavior="false" /﹥   
 
 

In addition, you can filter the carriage return practices by controlling the focus. You need to record it to obtain the ID of the control where the current page focus is located:

 
 

  
  
document.activeElement  
 
 

For ASP. NET. We enter the content in textbox1 and press enter to execute the click method of button1. Write it in the page_load event method.

 
 

  
  
TextBox1.Attributes.Add("onkeydown",   
  
  
 
  
  
"if(event.which || event.keyCode){  
  
  
 
  
  
if ((event.which == 13) || (event.keyCode == 13)) {  
  
  
 
  
  
document.getElementById('"+  
  
  
 
  
  
Button1.UniqueID+"').click();return false;}}   
  
  
 
  
  
else {return true}; ");  
 
 

When the Form runat = server is used in ASP. NET, the <asp: button... in the form cannot be submitted by carriage return.
Now I finally found a property to do this. Use this. Form. defaultbutton = "contentplaceholder1 $ btsubmit ";
It is worth noting that if masterpage is used, the ID of the motherboard MUST be added before the button ID: contentplaceholderid and a dollar sign ($)

C # The implementation code is as follows:

 
 

  
  
<%@ Page Language = "C #"
  
  
Masterpagefile = "~ /Masterpage. Master"
  
  
Autoeventwireup = "true"
  
  
Codefile = "login. aspx. cs"
  
  
Inherits = "login" %>
  
  
<Asp: Content ID = "content1"
  
  
Contentplaceholderid = "contentplaceholder1"
  
  
Runat = "server">
  
  
<Asp: textbox runat = "server"
  
  
Id = "WD"> </ASP: textbox>
  
  
<Asp: button id = "btsubmit"
  
  
Runat = "server" text = "Submit"
  
  
Onclick = "btsubmit_click"/>
  
  
...........................
  
  
</ASP: content>
 
 

(1) category with parent board pages:

 
 

  
  
protected void Page_Load(object sender, EventArgs e)  
  
  
{  
  
  
this.Form.DefaultButton = "ContentPlaceHolder1$btsubmit";  
  
  
} 
 
 

Or on the Content Page

 
 

  
  
protected void Page_Load(object sender, EventArgs e)  
  
  
{  
  
  
this.Page.Form.DefaultButton = "ContentPlaceHolder1$btsubmit";  
  
  
} 
 
 

(2) in the category of non-Parent Board pages:

 
 

  
  
protected void Page_Load(object sender, EventArgs e)  
  
  
{  
  
  
this.Form.DefaultButton = "btsubmit";  
  
  
} 
 
 

ASP. NET press enter to submit the event details here, I hope to learn more about ASP. Net Press enter to submit the event.