jQuery AJAX implements method sharing for calling page background methods and web service definitions_jquery

1. Create a new demo.aspx page.
2. First add a reference to the background file demos.aspx.cs of the page.

using System.Web.Services;
3. Method call without parameters. Please note that this version cannot be lower than .net framework 2.0. 2.0 is no longer supported.
Backend code:

Copy code The code is as follows:

[WebMethod]
public static string SayHello()
{
return "Hello Ajax!";
}

JS code:

Copy code The code is as follows:

$(function() {
$("#btnOK").click(function() {
$.ajax({
//To use the post method
type: "Post",
//The page where the method is located and the method name
url: "Demo.aspx/SayHello",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
//The returned data uses data.d to obtain the content
alert(data.d);
},
error: function(err) {
alert(err);
}
});

//Disable button Submit
return false;
});
});

Page code:

Copy code The code is as follows:

3. Method call with parameters
Backend code:

Copy code The code is as follows:

[WebMethod]
public static string GetStr(string str, string str2)
{
return str str2;
}

JS code:

Copy code The code is as follows:

$(function() {
$("#btnOK").click(function() {
$.ajax({
type: "Post",
url: "demo.aspx/GetStr",
//The method parameters must be written correctly, str is the name of the formal parameter, str2 is the name of the second formal parameter
data: "{'str':'I am','str2':'XXX'}",
contentType: "application/json; charset=utf-8 ",
dataType: "json",
success: function(data) {
//The returned data is obtained using data.d
alert(data.d);
},
error: function(err) {
alert(err);
}
});

//Disable button submission
return false;
} );
});

The operation effect is as follows:

4. Return array method
Backend code:

Copy code The code is as follows:

[WebMethod]
public static List GetArray()
{
List li = new List();

for (int i = 0 ; i li.Add(i "");

return li;
}

JS code:

Copy code The code is as follows:

$(function() {
$("#btnOK"). click(function() {
$.ajax({
type: "Post",
url: "demo.aspx/GetArray",
contentType: "application/json; charset=utf- 8",
dataType: "json",
success: function(data) {
//Clear ul before inserting
$("#list").html("");

//Recursively obtain data
$(data.d).each(function() {
//Insert the results into li
$("#list").append("

" this "

");
});

alert(data.d);
},
error: function(err) {
alert(err);
}
});

//Disable button submission
return false;
});
});

Run result chart: