StackOverflow2013

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plurals

PO
primarykey
Id
10362514
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-04-28T10:06:02.027
FavoriteCount
0
LastActivityDate
2012-04-28T10:06:02.027
LastEditDate
LastEditorUserId
0
OwnerUserId
899205
ParentId
10362430
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
<p>You have a lot of mistakes in your code, try codes below:</p> <pre><code><!DOCTYPE html> <html> <head><title>Register new user!</title> <script src="jquery-1.7.1.min.js"></script> </head> <body> Username: <input type="text" name="username" id="username"/><span id="user"></span><br/> Password: <input type="password" name="password" id="password"/><br/> <input type="button" value="Register" name="submit" id="submit" onclick="register_user();"/> </body> <script> function register_user() { $.ajax({ type: "POST", data: { username: $('#username').val(), }, url: "userexists.php", success: function(data) { if(data === 'USER_EXISTS') { $('#user') .css('color', 'red') .html("This user already exists!"); } else if(data === 'USER_AVAILABLE') { $('#user') .css('color', 'green') .html("User available."); } } }) } </script> </html> </code></pre> <p>And for your php code:</p> <pre><code><?php // connection to the db define(IPHOST,"localhost"); define(DBPASSWORD,""); define(DBUSER,"root"); define(DATABASE,"ajaxtest"); define(TABLENAME,"at"); $conn=mysql_connect(IPHOST,DBUSER,DBPASSWORD) or die(mysql_error()); mysql_select_db(DATABASE) or die(mysql_error()); $username = mysql_real_escape_string($_POST['username']); // $_POST is an array (not a function) // mysql_real_escape_string is to prevent sql injection $sql = "SELECT username FROM ".TABLENAME." WHERE username='".$username."'"; // Username must enclosed in two quotations $query = mysql_query($sql); if(mysql_num_rows($query) == 0) { echo('USER_AVAILABLE'); } else { echo('USER_EXISTS'); } ?> </code></pre>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POajax call to check duplicate data
  singulars
  PostTypePostTypeId
  PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. This table or related slice is empty.
UserOwnerUserId
1. USAram Alipoor
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POajax call to check duplicate data
  singulars
  PostTypePostTypeId
  PTQuestion
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
  singulars
  PostPostId
  PO
  UserUserId
  This table or related slice is empty.
  VoteTypeVoteTypeId
  VTAcceptedByOriginator
2. VO
  singulars
  PostPostId
  PO
  UserUserId
  This table or related slice is empty.
  VoteTypeVoteTypeId
  VTUpMod
CommentsPostId
1. This table or related slice is empty.

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