Asp. NET in the foreground JavaScript and background code calls

Asp. NET in the foreground JavaScript and background code calls
1 is JavaScript accessing C # functions?
2. If Ann is accessing C # variables in JavaScript?
3. If Ann is accessing JavaScript's already variable in C #?
4. If Ann is accessing JavaScript functions in C #?
Title 1 answers to the following:
The functions in C # code are implemented in JavaScript functions:
Method 1:1, the initial set up a button, is the background will invoke the content of the call may be written in Button_Click;
Second, is writing a JS function at the foreground, the content is document.getElementById ("Btn1"). Click ();
Third, the foreground may invoke the JS function background, fire Click event, that is, access to the background C # function;
Method 2:1, function declaration is public
The following is what is invoked:
Background code (change public to protected)
public string SS ()
{
Return ("a");
}
Second, in the HTML is used to call
Front desk Script
<script language=javascript>
var a = "<%=ss ()%>";
alert (a);
</script>
Method 3:1,
<script language= "JavaScript" >
<!--
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 ();
}
-
</script>
<input id= "Button1" type= "button" Name= "Button1" value= "button"
Method Four:
<script language= "JavaScript" >
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 ();
}
}
</script>
<input onkeypress= "Submitkeyclick ()" id= "AAA" type= "text" >
<input type= "hidden" name= "Funname" >〈! --Used to store the function you want to call--〉
Is. CS is available in:
The following is what is invoked:
Public Page_onload ()
{
if (! Page.ispost ())
{
String strfunname=request.form["Funname"]!=null? request.form["Funname"]: "";
Determine which function to invoke by following 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 ()
{
...... A metaphor for a value
}
Heading 2. are JavaScript accessing C # variables?
Answer the following:
Method 1:1, through hidden domain access on the page
<input id= "xx" type= "hidden" runat= "Server" >
Method 2:1, such as the background concept of public STRING N; The format for invoking this variable in the foreground JS is "maybe" + + "
Method 3:1, approximately you can register a script on the page after assigning a value to the server side variable
"<script language= ' JavaScript ' >var temp=" + tmp + "</script>"
TMP is the background variable, and then JS can indirectly access the temp to get the value.
Heading 3. If Ann is accessing JavaScript's already variable in C #?
Answer the following:
Method 1:1, the foreground uses the static text control to hide the field, writes the JS variable value to this, second, the background uses the request["the ID" to obtain the value;
Method Two: You can use a cookie or a session
Heading 4. If Ann is accessing JavaScript functions in C #?
Answer the following:
Implement JavaScript functions in C # code:
Method 1:1,
Page.registerstartupscript ("GGG", "" ");
Method Two: Use the literal class, and then

private void Button2_Click (object sender, System.EventArgs e)
{
String str;
Str= "";
Literal1.visible=true;
LITERAL1.TEXT=STR;
}

Asp. NET in the foreground JavaScript and background code calls