JavaScript and asp.net (c#) call each other's methods_javascript skills

1. Obtain the aspx client request address:

2. C# calls the client method: (top.window.document: table parent form, if the MainFrame object is in this form, do not add top.window. document)
Method in Js:


C# call:


3. C# calls client method:

The following problems to be solved are as follows:
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 the C# code in the javaScript function:
Method 1:
1. First create a button, Write the called or processed content into button_click in the background;
2. Write a js function in the foreground with the content document.getElementById("btn1").click();
3. Call it in the foreground or background js function, which triggers a click event, is equivalent to accessing the backend c# function;
Method two:
1. Declare the function as public
Backend code (you can also change public to protected)
public string ss()
　{
　return("a");
　}
　2. You can call the front-end script in html

　Method 3:

"SubmitKeyClick()" id="aaa" type="text">
　 〈! --Used to store the function you want to call--〉
　In .CS there are:
public Page_OnLoad()
　{
　if (!Page.IsPost())
　　{

　　　{
　　　　case "enter()":
　　　enter() ; //Call this function
　　　break; break;
　　　default:
　　　　 //Call the default function
　　　break; ...For example, calculating a certain value
　}

Question 2. How to access C# variables in JavaScript?
The answer is as follows:
Method 1: 1. Access
　
Method 2: 1. If PUBLIC STRING N is defined in the background; the format for referencing this variable in the front-end js is '' or " "
　
Method three: 1. Or you can register a script on the page after assigning values ​​to server-side variables
""
tmp is a background variable, and then you can directly access temp in js to get the value.

Question 3. How to access existing variables of JavaScript in C#?
The answer is as follows:
Method 1: 1. Use a static text control to hide the field in the front desk and write the js variable value into it; 2. Use request["id"] in the background to obtain the value;
Method 2: You can use cookie or session

Question 4. How to access JavaScript functions in C#?
The answer is as follows:
Execute javaScript function in c# code:
Method one: 1.
Page.RegisterStartupScript("ggg"," ");
Method two: Use Literal class, and then
private void Button2_Click(object sender, System.EventArgs e)
　{
　string str;
　str=" ";
　 //Literal1.Visible=true;