JavaScript gets the background C # variable and calls the background method

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Sometimes it is necessary to get the value of the background variable in JavaScript, to judge the JavaScript execution logic, or to call the C # backend method to get the data, we can use the <%=%> expression is easy to implement, <%=%> mainly is to bind the expression , and evaluates the value of an expression.

1.JavaScript gets the background variable. Declare a global variable in the background and set the Access property of the variable to protected or public, which you can use on the page.

Declare a variable of type protected or public in the background C # code:

1 public partial class WebForm1:System.Web.UI.Page

2 {

3 protected string str;

4 protected void Page_Load (object sender, EventArgs e)

5 {

6 str = "Hello";

7}

8}<br>

Gets the value of the variable in the foreground JS:

1 <script type= "Text/javascript" >

2 $ (document). Ready (function () {

3 Alert ("<%=str%>");

4});

5 </script>

2. Call the background method in JavaScript. To declare a public type method in the background, the Access property of the method must be public so that it can be accessed at the foreground.

A method that declares a pubic type in the background:

public partial class WebForm1:System.Web.UI.Page

02 {

protected void Page_Load (object sender, EventArgs e)

04 {

05

06}

public string Getstr ()

08 {

Return "Hello World";

10}

11}

Call the background C # method in the foreground JS to get the value:

1 <script type= "Text/javascript" >

2 $ (document). Ready (function () {

3 Alert ("<%=getstr ()%>");

4});

5 </script>

JS get C # backend method, variable and session

See http://www.cnblogs.com/starxp/articles/1711650.html

JavaScript gets the background C # variable and calls the background method