jQuery AJAX get() and post() Methods

The jQuery get() and post() methods are used to request data from the server with a HTTP GET or POST request.

HTTP Request: GET vs. POST

Two commonly used methods for a request-response between a client and server are: GET and POST.

  • GET - Requests data from a specified resource
  • POST - Submits data to be processed to a specified resource

GET is basically used for just getting (retrieving) some data from the server.
Note: The GET method may return cached data.
POST can also be used to get some data from the server. However, the POST method NEVER caches data, and is often used to send data along with the request.

jQuery $.get() Method

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

$.get(URL,callback);

The required URL parameter specifies the URL you wish to request.
The optional callback parameter is the name of a function to be executed if the request succeeds.
The following example uses the $.get() method to retrieve data from a file on the server:
$("button").click(function(){
$.get("demo_test.php", function(data, status){
alert("Data: " + data + "\nStatus: " + status);
});
});

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

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

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

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

Tip: Here is how the PHP file looks like ("demo_test.php"):

<?php
echo "This is some text from an external PHP file.";
?>

jQuery $.post() Method

The $.post() method requests data from the server using an HTTP POST request.

Syntax:

$.post(< ;i> ;URL,data,callback< ;/i> ;);

The required URL parameter specifies the URL you wish to request.

The optional data parameter specifies some data to send along with the request.

The optional callback parameter is the name of a function to be executed if the request succeeds.

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

$("button").click(function(){
$.post("demo_test_post.asp",
{
name: "Donald Duck",
city: "Duckburg"
},
function(data, status){
alert("Data: " + data + "\nStatus: " + status);
});
});

The first parameter of $.post() is the URL we wish to request ("demo_test_post.php").

Then we pass in some data to send along with the request (name and city).

The ASP script in "demo_test_post.php" reads the parameters, processes them, and returns a result.

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

Tip: Here is how the PHP file looks like ("demo_test_post.php"):

<?php
$fname=$_REQUEST['name'];
$city=$_REQUEST['city'];
echo "Dear $fname ";
echo "Hope you live well in $city";
?>

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