jQuery - AJAX get()/post() methods


jQuery - AJAX get() and post() methods

jQuery get() and post() methods are used for HTTP GET or POST requests request data from the server.

HTTP request: GET vs. POST

Both requests are made on the client side and the server side -Common methods of response are: GET and POST.

GET - Request data from the specified resource

POST - Submit the data to be processed to the specified resource

GET is basically used to obtain (retrieve) data from the server . Note: The GET method may return cached data.

POST can also be used to get data from the server. However, the POST method does not cache data and is often used to send data along with the request.

To learn more about GET and POST and the differences between the two methods, read our HTTP Methods - GET vs. POST.

##jQuery $.get() method

$ The .get() method requests data from the server via an HTTP GET request.

Syntax:

$.get(URL,callback);
Required URL parameters specify the URL you wish to request.

The optional callback parameter is the name of the function executed after the request is successful.

The following example uses the $.get() method to retrieve data from a file on the server:

Example

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
	$("button").click(function(){
		$.get("/try/ajax/demo_test.php",function(data,status){
			alert("数据: " + data + "\n状态: " + status);
		});
	});
});
</script>
</head>
<body>

<button>发送一个 HTTP GET 请求并获取返回结果</button>

</body>
</html>

Run instance»Click the "Run instance" button to view the online instance

$. The first parameter of get() is the URL we want to request ("demo_test. php").

The second parameter is the callback function. The first callback parameter stores the content of the requested page, and the second callback parameter stores the status of the request.

Tip: This PHP file ("demo_test.php") is similar to this:

<?php
echo 'This is data read from the PHP file. ';

?>

jQuery $.post() method

$.post() Method requests data from the server via HTTP POST request.

Syntax:

$.post(URL,data,callback);
Required URL parameters specify the URL you wish to request.

The optional data parameter specifies the data to be sent with the request.

The optional callback parameter is the name of the function executed after the request is successful.

The following example uses $.post() to send data along with the request:

Example

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
	$("button").click(function(){
		$.post("/try/ajax/demo_test_post.php",{
			name:"菜鸟教程",
			url:"http://www.runoob.com"
		},
		function(data,status){
			alert("数据: \n" + data + "\n状态: " + status);
		});
	});
});
</script>
</head>
<body>

<button>发送一个 HTTP POST 请求页面并获取返回内容</button>

</body>
</html>

Run Example » Click the "Run Instance" button to view the online instance

The first parameter to

$.post() is the URL we wish to request ("demo_test_post.php").

Then we send the data along with the request (name and city).

The PHP script in "demo_test_post.php" reads these parameters, processes them, and returns the results.

The third parameter is the callback function. The first callback parameter stores the content of the requested page, while the second parameter stores the status of the request.

Tips: This PHP file ("demo_test_post.php") is similar to this:

<?php
$name = isset($_POST['name']) ? htmlspecialchars($_POST['name']) : '';
$city = isset($_POST['url']) ? htmlspecialchars($_POST['url']) : '';
echo 'Website name: ' . $name;
echo "\n";
echo 'URL address: ' .$city;
?>


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