Jquery. Ajax of method call Asp.Net background method parsing
- 2020-03-30 01:42:46
- OfStack
JQuery's $.ajax() makes it easy to call asp.net's backend methods.
Let's warm up with a simple example.
1. Method call without parameters
Asp.net code:
using System.Web.Script.Services;
[WebMethod]
public static string SayHello()
{
return "Hello Ajax!";
}
using System.Web.Script.Services;
[WebMethod]
public static string SayHello()
{
return "Hello Ajax!";
}
Note: 1. Methods must be static and have a WebMethod declaration
JQuery code:
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
$("#btnOK").click(function() {
$.ajax({
//You want to use post & cake;
type: "Post",
//Method page and method name & NBSP;
url: "data.aspx/SayHello",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
//The returned data is retrieved with data.d
alert(data.d);
},
error: function(err) {
alert(err);
}
});
//Disable button submission & NBSP;
return false;
});
});
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
$("#btnOK").click(function() {
$.ajax({
//I'm going to post it
type: "Post",
//Method page and method name
url: "data.aspx/SayHello",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
//The returned data is retrieved with data.d
alert(data.d);
},
error: function(err) {
alert(err);
}
});
//Disable button submission
return false;
});
});
Results:
2. Method call with parameters
Asp.net code:
using System.Web.Script.Services;
[WebMethod]
public static string GetStr(string str, string str2)
{
return str + str2;
}
using System.Web.Script.Services;
[WebMethod]
public static string GetStr(string str, string str2)
{
return str + str2;
}
JQuery code:
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
$("#btnOK").click(function() {
$.ajax({
type: "Post",
url: "data.aspx/GetStr",
//Method must be written correctly, STR is the name of the parameter,str2 is the name of the second parameter & NBSP;
data: "{'str':' I am a ','str2':'XXX'}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
//The returned data is retrieved with data.d
alert(data.d);
},
error: function(err) {
alert(err);
}
});
//Disable button submission & NBSP;
return false;
});
});
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
$("#btnOK").click(function() {
$.ajax({
type: "Post",
url: "data.aspx/GetStr",
//Method to pass the parameter must be written correctly, STR is the name of the parameter,str2 is the name of the second parameter
data: "{'str':' I am a ','str2':'XXX'}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
//The returned data is retrieved with data.d
alert(data.d);
},
error: function(err) {
alert(err);
}
});
//Disable button submission
return false;
});
});
Operation results:
Now let's go to the advanced application
Returns the call to the array method
Asp.net code:
using System.Web.Script.Services;
[WebMethod]
public static List<string> GetArray()
{
List<string> li = new List<string>();
for (int i = 0; i < 10; i++)
li.Add(i + "");
return li;
}
using System.Web.Script.Services;
[WebMethod]
public static List<string> GetArray()
{
List<string> li = new List<string>();
for (int i = 0; i < 10; i++)
li.Add(i + "");
return li;
}
JQuery code:
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
$("#btnOK").click(function() {
$.ajax({
type: "Post",
url: "data.aspx/GetArray",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
//Empty ul before inserting;
$("#list").html("");
//Recursively getting data & NBSP;
$(data.d).each(function() {
//Insert the result into li & NBSP;
$("#list").append("<li>" + this + "</li>");
});
alert(data.d);
},
error: function(err) {
alert(err);
}
});
//Disable button submission & NBSP;
return false;
});
});
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
$("#btnOK").click(function() {
$.ajax({
type: "Post",
url: "data.aspx/GetArray",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
//Empty ul before inserting
$("#list").html("");
//Get the data recursively
$(data.d).each(function() {
//Insert the result into li
$("#list").append("<li>" + this + "</li>");
});
alert(data.d);
},
error: function(err) {
alert(err);
}
});
//Disable button submission
return false;
});
});
Operation results:
Returns a call to the Hashtable method
Asp.net code:
using System.Web.Script.Services;
using System.Collections;
[WebMethod]
public static Hashtable GetHash(string key,string value)
{
Hashtable hs = new Hashtable();
hs.Add("www", "yahooooooo");
hs.Add(key, value);
return hs;
}
using System.Web.Script.Services;
using System.Collections;
[WebMethod]
public static Hashtable GetHash(string key,string value)
{
Hashtable hs = new Hashtable();
hs.Add("www", "yahooooooo");
hs.Add(key, value);
return hs;
}
JQuery code:
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
$("#btnOK").click(function() {
$.ajax({
type: "Post",
url: "data.aspx/GetHash",
//Remember to put double quotation marks & NBSP; T_T
data: "{ 'key': 'haha', 'value': ' Ha ha! ' }",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
alert("key: haha ==> "+data.d["haha"]+"n key: www ==> "+data.d["www"]);
},
error: function(err) {
alert(err + "err");
}
});
//Disable button submission & NBSP;
return false;
});
});
/// <reference path="jquery-1.4.2-vsdoc.js"/>
$(function() {
$("#btnOK").click(function() {
$.ajax({
type: "Post",
url: "data.aspx/GetHash",
//Remember to put double quotation marks & NBSP; T_T
data: "{ 'key': 'haha', 'value': ' Ha ha! ' }",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
alert("key: haha ==> "+data.d["haha"]+"n key: www ==> "+data.d["www"]);
},
error: function(err) {
alert(err + "err");
}
});
//Disable button submission
return false;
});
});
Operation results:
5. Manipulate XML
XMLtest. XML:
<?xml version="1.0" encoding="utf-8" ?>
<data>
<item>
<id>1</id>
<name>qwe</name>
</item>
<item>
<id>2</id>
<name>asd</name>
</item>
</data>
<?xml version="1.0" encoding="utf-8" ?>
<data>
<item>
<id>1</id>
<name>qwe</name>
</item>
<item>
<id>2</id>
<name>asd</name>
</item>
</data>
JQuery code:
$(function() {
$("#btnOK").click(function() {
$.ajax({
url: "XMLtest.xml",
dataType: 'xml', //The return type is XML, not the same as the Json before & NBSP;
success: function(xml) {
//Empty list
$("#list").html("");
//Find the XML element & NBSP; KVM online shopping brush website construction Beijing express company ultrasonic welding machine
$(xml).find("data>item").each(function() {
$("#list").append("<li>id:" + $(this).find("id").text() +"</li>");
$("#list").append("<li>Name:"+ $(this).find("name").text() + "</li>");
})
},
error: function(result, status) { //If you don't have the above catch error you execute the callback function here & NBSP;
alert(status);
}
});
//Disable button submission & NBSP;
return false;
});
});
$(function() {
$("#btnOK").click(function() {
$.ajax({
url: "XMLtest.xml",
dataType: 'xml', //The return type is XML, which is different from Json
success: function(xml) {
//To empty the list
$("#list").html("");
//Finding XML elements
$(xml).find("data>item").each(function() {
$("#list").append("<li>id:" + $(this).find("id").text() +"</li>");
$("#list").append("<li>Name:"+ $(this).find("name").text() + "</li>");
})
},
error: function(result, status) { //If you don't have the catch above, you will execute the callback function here
alert(status);
}
});
//Disable button submission
return false;
});
});