Jquery+ajax implementation of registered real-time verification examples _jquery

The example of this article describes the real time verification of JQUERY+AJAX implementation registration. Share to everyone for your reference, specific as follows:

When we register a user, will prompt that the user's information is available, this is the AJAX application, has seen this realization long ago, today looked again, to record down O (∩_∩) o ha!

First introduced under Ajax $.get, because $.post usage and $.get are not the same as the introduction:

This is a simple GET request function to replace the complex $.ajax. Callback functions can be invoked when the request succeeds. If you need to perform a function when an error occurs, use $.ajax.

Copy Code code as follows:

$ (selector). Get (Url,data,success (RESPONSE,STATUS,XHR), DataType)

Parameters	Description
Url	Necessary. Specify which URL to send the request to.
Data	Optional. Specify the data to be sent to the server along with the request.
Success (RESPONSE,STATUS,XHR)	Optional. A function that is required to run when a request succeeds. Additional parameters: Response-Contains the result data from the request Status-Contains the state of the request XHR-Contains XMLHttpRequest objects
DataType	Optional. Specify the data type of the expected server response. By default, JQuery will intelligently judge. Possible types: "XML" "HTML" "Text" "Script" "JSON" "Jsonp"

Request test.php Web page, ignore return value:

Copy Code code as follows:

$.get ("test.php");

More examples:

Example 1

Request test.php Web page, transfer 2 parameters, ignore return value:

Copy Code code as follows:

$.get ("test.php", {name: "John", Time: "2pm"});

Example 2

Displays the test.php return value (HTML or XML, depending on the return value):

$.get ("test.php", function (data) {
 alert ("Data Loaded:" + data);
});

Example 3

Displays the test.cgi return value (HTML or XML, depending on the return value), and adds a set of request parameters:

$.get ("test.cgi", {name: "John", Time: "2pm"},
function (data) {
  alert ("Data Loaded:" + data);
});

Post My Code below:

<?php 
$link =mysql_connect ("localhost", "root", "");
mysql_select_db ("test");
mysql_query ("Set names UTF8");/
$sql = "SELECT * from user where user= '". $_get[' username ']. "'; /
  $result =mysql_query ($sql) or Die (Mysql_error ());
$num =mysql_affected_rows ();
if ($num ==0)
$msg =1;
else
  $msg =0;
echo $msg;/return value
mysql_close ($link);
? >

I hope this article will help you with the jquery program design.