Several ways to interact with. NET and JavaScript scripts

1.asp.net Call JS

Response.Write ("<script language=javascript>");

Response.Write ("alert (' Welcome to Dengfeng ');");

Response.Write ("location.href= ' login.aspx ';");

Response.Write ("</script>");

In this case, you can call the function of the JS script in the page to

2. How the JS script accesses the value of the server control

The interface has a TextBox control, ID Name,js can use the following script to take the value of name

var myvalue=document.all (' Name '). Value;

3, server control how to take the value of the variable in JS

The method is to put a hidden control HtmlInputHidden on the interface and then set to run as a server control so that the value of the control can be accessed in the JS script and in the ASP.

To assign a value to a server control in JS:

var bt=document.all (' Name '). Value;

bt.value= ' name ';

Asp. NET, accessed using Name.value.

4. Calls between foreground and background functions

<title>untitled page</title>

<script type= "Text/javascript" >

function CallServer (ARG) {

var oTb = document.getElementById (' <%=editvalue.clientid%> ');

The variables passed to the server in ARG

arg = Otb.value;

<%=clientscript.getcallbackeventreference (This, "Arg", "Receiveserverresult", NULL, True)%>

}

function Receiveserverresult (Result) {

Here you add the logic that handles the server's return result, which is the result of the server's return

alert (result);

}

</script>

...//Omit part of the code here

<asp:textbox id= "EditValue" runat= "Server"/>

<asp:button id= "btnsubmit" runat= "Server" text= "Submit Data" onclientclick= "CallServer (); return false;"/>

CS file

C # code

The page class inherits the ICallbackEventHandler interface and implements two of these methods

Public partial class _default:system.web.ui.page, ICallbackEventHandler

{

private string m_strresult = "";

#region ICallbackEventHandler Members

public string GetCallbackResult ()

{

Returns server-side processing results to the Receiveserverresult method

return m_strresult;

}

public void RaiseCallbackEvent (String eventargument)

{

Eventargument is a variable from the client that corresponds to the ARG variable

Add server-side processing logic here ...

M_strresult = eventargument;

}

#endregion

}

The functions in the C # code are executed in the 5.javaScript function:

Method One: 1, first set up a button, in the background will be called or processed content written in Button_Click;

2, write a JS function in the foreground, the content is document.getElementById ("Btn1"). Click ();

3, in the foreground or background call JS function, fire click event, equal access to the background C # function;

Method Two: 1, function declaration is public

Background code (change public to protected also can)

public string SS ()

{

Return ("a");

}

2, in the HTML with <%=fucntion ()%> can call

Foreground script

var a = "<%=ss ()%>";

alert (a);

Method Three: 1,

!--

function __doPostBack (Eventtarget, eventargument)

{

var theform = document. Form1; Refers to the form of runat=server

Theform.__eventtarget.value = Eventtarget;

Thefrom.__eventargument.value = eventargument;

Theform.submit ();

}

-->

Method Four:

function Submitkeyclick ()

{

if (Event.keycode = = 13)

{

Event.cancelbubble = true;

Event.returnvalue = false;

Document.all.funname.value= "The name of the function you want to invoke";

Document.form[0].submit ();

}

}

〈! --Used to store the function you want to call--〉

In. cs There are:

Public Page_onload ()

{

if (! Page.ispost ())

{

String strfunname=request.form["Funname"]!=null? request.form["Funname"]: "";

Determines which function to call based on the value returned

Switch (strfunname)

{

Case "Enter ()":

Enter (); Call this function

Break

Case "Other":

Calling other functions

Break

Default

Calling the default function

Break

}

}

}

public void Enter ()

{

...... such as calculating a value

}

6. How do I access C # variables in JavaScript?

Method One: 1, through the page hidden domain access

Method Two: 1, such as the background defines the public STRING N; The format for referencing the variable in the foreground JS is ' <%=n%> ' or ' + <%=n%> + '

Method Three: 1, or you can register a script on the page after the server-side variable is assigned a value

""

TMP is a background variable, and then JS can directly access the temp to get the value.

7. How do I access JavaScript functions in C #?

Execute JavaScript functions in C # code:

Method One: 1, page.registerstartupscript ("GGG", "");

Method Two: Use the literal class, and then

private void Button2_Click (object sender, System.EventArgs e)

{

String str;

str= "

str+= "Selectrange ()";

str+= "";

Literal1.visible=true;

LITERAL1.TEXT=STR;

}

Several ways to interact with. NET and JavaScript scripts