Js call background background call foreground method summary

Js call background, background call foreground method summary

1. Execute functions in C# code in javaScript functions:

Method 1:1. First, create a button and write the contents of the call or process to Button1_Click in the background;

 
protected void Button1_Click(object sender, EventArgs e) 
{ 
this.TextBox1.Text = "voodooer"; 
} 

2. In the foreground, it can be called as follows:

 
<input type="button" value=" access C# The method of " onclick='document.getElementById("Button1").click();' /> 

Method 2:1. Declare the function as public or protected

 
public string ss() 
{ 
return("voodooer"); 
} 

2. Foreground call method

 
<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 the runat = server
theForm.__EVENTTARGET.value = eventTarget; 
theFrom.__EVENTARGUMENT.value = eventArgument; 
theForm.submit(); 
} 
--> 
</script> 
<input type="button" value=" button " > 

Method 4:

 
<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 call " ;  
document.form[0].submit(); 
} 
} 
</script> 
<INPUT type="text"> 
<input type="hidden" >    

In.CS we have:

 
public Page_OnLoad() 
{ 
if (!Page.IsPost()) 
{ 
string strFunName=Request.Form["FunName"]!=null?Request.Form["FunName"]:""; 
//Which function to call depends on the value returned
switch(strFunName) 
{ 
case "enter()": 
enter() ; //Call this function
break; 
case " other ": 
//Call other functions
break; 
default: 
//Calling the default function
break; 
} 
} 
} 
public void enter() 
{ 
//... Let's say I calculate something
} 

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

The answer is as follows:

Method 1:1, through the page to hide the domain access < Input type = "hidden" runat = "server" >

Method 2:1. For example, the background defines PUBLIC STRING N; The format of the reference to this variable in foreground js is' < % = n % > 'or "+ < % = n % > +"

Or you can register a script on the page after a server-side variable is assigned

"< Script language = 'javascript' > Var temp=" + TMP + "< / script>"

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

3. How do I access JavaScript's existing variables in C#?

The answer is as follows:

Method 1:1. The foreground USES the static text control to hide the field, and writes the js variable value into it;

2. The background USES request["id"] to get the value;

Method 2: you can use cookies or sessions

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

The answer is as follows:

Execute javaScript function in c# code:

Method one: 1, Page. RegisterStartupScript (" GGG ", "< Script> SetVisible (1); < / script>" );

Method 2: use the Literal class, and then

 
private void Button2_Click(object sender, System.EventArgs e) 
{ 
string str; 
str=" <script language='javascript'>"; 
str+="selectRange()"; 
str+=" </script>"; 
//Literal1.Visible=true; 
Literal1.Text=str; 
}