1. Access C # functions using JavaScript
2. JavaScript accesses the C # variable
3. Access existing JavaScript variables in C #
4. How to access JavaScript Functions in C #
Access C # functions using JavaScript
Method 1,
1. Create a button to write the called or processed content to button_click in the background;
2. Write a js function on the front-end with the content document. getElementById ("btn1"). click ();
3. Call js functions on the frontend or backend to stimulate the click event, which is equivalent to accessing the c # function in the background;
Method 2,
1. function declaration is public or protected
Copy codeThe Code is as follows:
Public string Hello ()
{
Return ("Hello World ");
}
2. You can call <% = fucntion () %> in html.
Copy codeThe Code is as follows:
<Html xmlns = "http://www.w3.org/1999/xhtml%22>
<Head runat = "server">
<Title> Untitled Page </title>
<Script language = "javascript" type = "text/javascript">
Function say ()
{
Var strHello = "<% = Hello () %> ";
Alert (strHello );
}
</Script>
</Head>
<Body>
<Form id = "form1" runat = "server">
<Div>
<Asp: Button ID = "Button1" runat = "server" Text = "Button" OnClientClick = "say ();"/>
</Div>
</Form>
</Body>
</Html>
Method 3,
Copy codeThe Code is as follows:
<Script language = "javascript">
Function _ doPostBack (eventTarget, eventArgument)
{
Var frontForm = document. Form1; // indicates the form of runat = server.
FrontForm. _ EVENTTARGET. value = eventTarget;
FrontForm. _ EVENTARGUMENT. value = eventArgument;
FrontForm. submit ();
}
</Script>
<Input id = "Button1" type = "button" name = "Button1" value = "button" onclick = "javascript :__ doPostBack ('button1','') ">
Access C # variables in JavaScript
Method 1: 1. Access <input id = "xx" type = "hidden" runat = "server">
Method 2: 1. For example, public string n is defined in the background; the format of the variable referenced in front-end js is '<% = n %>' or "+ <% = n %> +"
Method 3: 1. You can register a script on the page after assigning values to variables on the server.
"<Script language = 'javascript '> var temp =" + tmp + "</script>"
Tmp is the background variable, and then you can directly access temp in js to obtain the value.
Access existing JavaScript variables in C #
Method 1: 1. the foreground uses static text controls to hide the field and write the js variable value into it;
2. the backend uses request ["id"] to obtain the value;
Method 2: cookie or session can be used
Access JavaScript Functions in C #
Method 1: 1. Page. RegisterStartupScript ("ggg", "<script> SetVisible (1); </script> ");
Method 2: Use the Literal class and
Copy codeThe Code is as follows:
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;
}
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