Detailed introduction to the mutual calls between C# code and javaScript functions

Mutual calls between C# code and JavaScript functions

Question:
1. How to access C# functions in JavaScript?
2. How to access C# variables in JavaScript?
3 .How to access existing variables of JavaScript in C#?
4.How to access JavaScript functions in C#?

The answer to question 1 is as follows:
Execute the function in C# code in the javaScript function:
Method 1: 1. First create a button, and write the calling or processing content into button_click in the background;
      2. Write a js function in the foreground with the content document.getElementById("btn1").click( ; Protected can also be used)

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

2. Use <%=fucntion()%> in html to call the front-end script

 <script language=javascript>
             var a = "<%=ss()%>";
             alert(a);
             </script>

Method 3: 1.

<script language="javascript">
             <!--
             function __doPostBack(eventTarget, eventArgument)
             {
                var theForm = document.Form1;       //指runat=server的form
                theForm.__EVENTTARGET.value = eventTarget;
                theFrom.__EVENTARGUMENT.value = eventArgument;
                theForm.submit();
             }
             -->
             </script>
             <input id="Button1" type="button" name="Button1" value="按钮" onclick="javascript:__doPostBack(&#39;Button1&#39;,&#39;&#39;)">

Method 4:

<script language="javascript">
function SubmitKeyClick(){      
if (event.keyCode == 13)      
{         
 event.cancelBubble = true;          
 event.returnValue = false;          
 document.all.FunName.value="你要调用的函数名"；          
 document.form[0].submit();      
 }}
 </script>
<INPUT onkeypress="SubmitKeyClick()" id="aaa" type="text">
<input type="hidden" name="FunName"> 
〈！--用来存储你要调用的函数 --〉

In .CS there is:

public Page_OnLoad()
{
if (!Page.IsPost())
{
string strFunName=Request.Form["FunName"]!=null?Request.Form["FunName"]:"";
//根据传回来的值决定调用哪个函数
switch(strFunName)
{
case "enter()":
enter() ; //调用该函数
break;
case "其他":
//调用其他函数
break;
default:
//调用默认函数
break;
}
}
}
public void enter()
{
//……比如计算某值
}

Question 2. How to access C# variables in JavaScript?

The answer is as follows:

Method 1 : 1. Access
through the hidden domain on the page. Method 2: 1. If PUBLIC STRING N is defined in the background; reference it in the front-end js The format of the variable is '<%=n%>' or "+<%=n%>+"

Method 3: 1. Or you can register a script on the page after assigning a value to the server-side variable

"<script language=&#39;javascript&#39;>var temp=" + tmp + "</script>"

              tmp is a background variable, and then temp can be directly accessed in js to obtain the value.


3. How to access existing variables of JavaScript in C#?

The answer is as follows:

Method 1: 1. Use static text control to hide the field in the front desk. Write the js variable value into it;

2. Use request["id"] in the background to get the value;

Method 2: You can use cookie or session

4. How to use C# Access the JavaScript function in?
The answer is as follows:

C#Execute the javaScript function in the code:

Method one: 1.

Page.RegisterStartupScript("ggg","<script>SetVisible(1);</script>");

Method two: Use the Literal class, and then

private void Button2_Click(object sender, System.EventArgs e)
{
string str;
str="<script language=&#39;javascript&#39;>";
str+="selectRange()";
str+="</script>";
//Literal1.Visible=true;
Literal1.Text=str;

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