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[p align=center]Sajax2.php
<?php  
if (!isset($SAJAX_INCLUDED)) {

  /*  
   * GLOBALS AND DEFAULTS
   *
   */
  $sajax_debug_mode = 0;
  $sajax_export_list = array();
  $sajax_request_type = "GET";
  $sajax_remote_uri = "";
  
  /*
   * CODE
   *
   */
  
  //
  // Initialize the Sajax library.
  //
  function sajax_init() {
  }
  
  //
  // Helper function to return the script's own URI.
  //
  function sajax_get_my_uri() {
    global $REQUEST_URI;
    
    return $REQUEST_URI;
  }
  $sajax_remote_uri = sajax_get_my_uri();
  
  //
  // Helper function to return an eval()-usable representation
  // of an object in JavaScript.
  //
  function sajax_get_js_repr($value) {
    $type = gettype($value);
    
    if ($type == "boolean" &#124;&#124;
      $type == "integer") {
      return "parseInt($value)";
    }
    elseif ($type == "double") {
      return "parseFloat($value)";
    }
    elseif ($type == "array" &#124;&#124; $type == "object" ) {
      //
      // XXX Arrays with non-numeric indices are not
      // permitted according to ECMAScript, yet everyone
      // uses them.. We'll use an object.
      //
      $s = "{ ";
      if ($type == "object") {
        $value = get_object_vars($value);
      }
      foreach ($value as $k=>$v) {
        $esc_key = sajax_esc($k);
        if (is_numeric($k))
          $s .= "$k: " . sajax_get_js_repr($v) . ", ";
        else
          $s .= "\"$esc_key\": " . sajax_get_js_repr($v) . ", ";
      }
      if (count($value))
        $s = substr($s, 0, -2);
      return $s . " }";
    }
    else {
      $esc_val = sajax_esc($value);
      $s = "'$esc_val'";
      return $s;
    }
  }

  function sajax_handle_client_request() {
    global $sajax_export_list;
    
    $mode = "";
    
    if (! empty($_GET["rs"]))
      $mode = "get";
    
    if (!empty($_POST["rs"]))
      $mode = "post";
      
    if (empty($mode))
      return;

    $target = "";
    
    if ($mode == "get") {
      // Bust cache in the head
      header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");    // Date in the past
      header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
      // always modified
      header ("Cache-Control: no-cache, must-revalidate");  // HTTP/1.1
      header ("Pragma: no-cache");                          // HTTP/1.0
      $func_name = $_GET["rs"];
      if (! empty($_GET["rsargs"]))
        $args = $_GET["rsargs"];
      else
        $args = array();
    }
    else {
      $func_name = $_POST["rs"];
      if (! empty($_POST["rsargs"]))
        $args = $_POST["rsargs"];
      else
        $args = array();
    }
    
    if (! in_array($func_name, $sajax_export_list))
      echo "-:$func_name not callable";
    else {
      echo "+:";
      $result = call_user_func_array($func_name, $args);
      echo "var res = " . trim(sajax_get_js_repr($result)) . "; res;";
    }
    exit;
  }
  
  function sajax_get_common_js() {
    global $sajax_debug_mode;
    global $sajax_request_type;
    global $sajax_remote_uri;
    
    $t = strtoupper($sajax_request_type);
    if ($t != "" && $t != "GET" && $t != "POST")
      return "// Invalid type: $t.. \n\n";
    
    ob_start();
    ?>
    
    // remote scripting library
    // (c) copyright 2005 modernmethod, inc
    var sajax_debug_mode = <?php echo $sajax_debug_mode ? "true" : "false"; ?>;
    var sajax_request_type = "<?php echo $t; ?>";
    var sajax_target_id = "";
    
    function sajax_debug(text) {
      if (sajax_debug_mode)
        alert("RSD: " + text)
    }
     function sajax_init_object() {
       sajax_debug("sajax_init_object() called..")
      
       var A;
      try {
        A=new ActiveXObject("Msxml2.XMLHTTP");
      } catch (e) {
        try {
          A=new ActiveXObject("Microsoft.XMLHTTP");
        } catch (oc) {
          A=null;
        }
      }
      if(!A && typeof XMLHttpRequest != "undefined")
        A = new XMLHttpRequest();
      if (!A)
        sajax_debug("Could not create connection object.");
      return A;
    }
    function sajax_do_call(func_name, args) {
      var i, x, n;
      var uri;
      var post_data;
      var target_id;
      
      sajax_debug("in sajax_do_call().." + sajax_request_type + "/" + sajax_target_id);
      target_id = sajax_target_id;
      if (sajax_request_type == "")
        sajax_request_type = "GET";
      
      uri = "<?php echo $sajax_remote_uri; ?>";
      if (sajax_request_type == "GET") {
      
        if (uri.indexOf("?") == -1)
          uri += "?rs=" + escape(func_name);
        else
          uri += "&rs=" + escape(func_name);
        uri += "&rst=" + escape(sajax_target_id);
        uri += "&rsrnd=" + new Date().getTime();
        
        for (i = 0; i < args.length-1; i++)
          uri += "&rsargs[]=" + escape(args[i]);

        post_data = null;
      }
      else if (sajax_request_type == "POST") {
        post_data = "rs=" + escape(func_name);
        post_data += "&rst=" + escape(sajax_target_id);
        post_data += "&rsrnd=" + new Date().getTime();
        
        for (i = 0; i < args.length-1; i++)
          post_data = post_data + "&rsargs[]=" + escape(args[i]);
      }
      else {
        alert("Illegal request type: " + sajax_request_type);
      }
      
      x = sajax_init_object();
      x.open(sajax_request_type, uri, true);
      
      if (sajax_request_type == "POST") {
        x.setRequestHeader("Method", "POST " + uri + " HTTP/1.1");
        x.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
      }
      
      x.onreadystatechange = function() {
        if (x.readyState != 4)
          return;

        sajax_debug("received " + x.responseText);
        
        var status;
        var data;
        var txt = x.responseText.replace(/^\s*&#124;\s*$/g,"");
        status = txt.charAt(0);
        data = txt.substring(2);
        if (status == "-")
          alert("Error: " + data);
        else {
          if (target_id != "")
            document.getElementById(target_id).innerHTML = eval(data);
          else {
            try {
              var callback;
              var extra_data = false;
              if (typeof args[args.length-1] == "object") {
                callback = args[args.length-1].callback;
                extra_data = args[args.length-1].extra_data;
              } else {
                callback = args[args.length-1];
              }
              callback(eval(data), extra_data);
            } catch (e) {
              alert(e + ": Could not eval " + data);
            }
          }
        }
      }
      sajax_debug(func_name + " uri = " + uri + "/post = " + post_data);
      x.send(post_data);
      sajax_debug(func_name + " waiting..");
      delete x;
      return true;
    }
    
    <?php
    $html = ob_get_contents();
    ob_end_clean();
    return $html;
  }
  
  function sajax_show_common_js() {
    echo sajax_get_common_js();
  }
  
  // javascript escape a value
  function sajax_esc($val)
  {
    $val = str_replace("\\", "\\\\", $val);
    $val = str_replace("\r", "\\r", $val);
    $val = str_replace("\n", "\\n", $val);
    return str_replace('"', '\\"', $val);
  }

  function sajax_get_one_stub($func_name) {
    ob_start();  
    ?>
    
    // wrapper for <?php echo $func_name; ?>
    
    function x_<?php echo $func_name; ?>() {
      sajax_do_call("<?php echo $func_name; ?>",
        x_<?php echo $func_name; ?>.arguments);
    }
    
    <?php
    $html = ob_get_contents();
    ob_end_clean();
    return $html;
  }
  
  function sajax_show_one_stub($func_name) {
    echo sajax_get_one_stub($func_name);
  }
  
  function sajax_export() {
    global $sajax_export_list;
    
    $n = func_num_args();
    for ($i = 0; $i < $n; $i++) {
      $sajax_export_list[] = func_get_arg($i);
    }
  }
  
  $sajax_js_has_been_shown = 0;
  function sajax_get_javascript()
  {
    global $sajax_js_has_been_shown;
    global $sajax_export_list;
    
    $html = "";
    if (! $sajax_js_has_been_shown) {
      $html .= sajax_get_common_js();
      $sajax_js_has_been_shown = 1;
    }
    foreach ($sajax_export_list as $func) {
      $html .= sajax_get_one_stub($func);
    }
    return $html;
  }
  
  function sajax_show_javascript()
  {
    echo sajax_get_javascript();
  }

  
  $SAJAX_INCLUDED = 1;
}
?>
Username_ajax.php

<?php
// Include the Sajax library
include "Sajax2.php";

// Open conection to the database
mysql_connect('localhost', 'root', 'myoa888');
mysql_select_db('database');

/*
CREATE TABLE `users` (
`user_id` INT( 9 ) NOT NULL AUTO_INCREMENT ,
`username` VARCHAR( 50 ) NOT NULL ,
`password` VARCHAR( 32 ) NOT NULL ,
PRIMARY KEY ( `user_id` ) ,
UNIQUE (`username`)
);

INSERT INTO `users` ( `username` , `password` ) VALUES ('username', 'password');
INSERT INTO `users` ( `username` , `password` ) VALUES ('tom', 'password');
INSERT INTO `users` ( `username` , `password` ) VALUES ('bill', 'password');
INSERT INTO `users` ( `username` , `password` ) VALUES ('bob', 'password');
*/

// Function to check if a username exists inside the database
function check_user_exist($username) {
  $username = mysql_escape_string($username);
  // Make a list of words to postfix on username for suggest
  $suggest = array('007', '1', 'theman', 'rocks');
  //$suggest = array();
  $sql = "SELECT `username` FROM `users` WHERE `username` = '$username'";
  $result = mysql_query($sql);
  if(mysql_num_rows($result) > 0) {
    // Username not available
    $avail[0] = 'no';
    $i = 2;
    // Loop through suggested ones checking them
    foreach($suggest AS $postfix) {
      $sql = "SELECT `username` FROM `users` WHERE `username` = '".$username.$postfix."'";
      $result = mysql_query($sql);
      if(mysql_num_rows($result) < 1) {
        $avail[$i] = $username.$postfix;
        $i ++;
      }
    }
    $avail[1] = $i - 1;
    return $avail;
  }
  // Username is available
  return array('yes');
}

sajax_init(); // Intialize Sajax
//$sajax_debug_mode = 1; //Uncomment to put Sajax in debug mode
sajax_export("check_user_exist"); // Register the function
sajax_handle_client_request(); // Serve client instances
?>

<html>
<head>
  <title>Gmail Style Check Username AJAX</title>
  <script type="text/javascript">
  <?php
  sajax_show_javascript();
  ?>
  function check_handle(result) {
    if(result[0] == 'yes') {
      document.getElementById('not_available').style.display = 'none';
      document.getElementById('available').style.display = 'block';
    }
    else {
      document.getElementById('available').style.display = 'none';
      document.getElementById('not_available').style.display = 'block';
      var str = 'Sorry that username is not available try these <br />';
      for(i = 1; i < result[1]; i++) {
        str += "<input type=\"radio\" name=\"try\" onclick=\"switch_username('"+result[i+1]+"')\"/>" + result[i+1] + "<br />";
      }
      document.getElementById('not_available').innerHTML = str;
    }
  }

  function check_user_exist() {
    var username = document.getElementById('username').value;
    x_check_user_exist(username, check_handle);
  }

  function switch_username(username) {
    document.getElementById('username').value = username;
  }
  </script>

  <style type="text/css">
        @import url( test.css );
  #available {
    display: none;
    color: green;
  }
  #not_available {
    display: none;
    color: red;
  }
  </style>
</head>
<body >
  <h2>AJAX Check Username</h2>
  <p>The following does a gmail style check on the username supplied to see if it is a unqiue username, using the AJAX method.
  <br />If not, it makes some suggestions to ones which are available. It uses a development version of Sajax.
  <br /><a href="username-ajax.phps">View Source</a> (<a href="Sajax2.php">Sajax2.php</a>) &#124; <a href="">Comments</a> &#124; <a href="ajax_user.zip">Download Files</a></p>
  <h2>Example</h2>
  Some examples of taken usernames are: <strong>tom</strong> , <strong>bill</strong>, <strong>bob</strong>, <strong>username</strong><br />
  <input type="text" name="username" id="username" size="20" value="tom">
  <input type="button" name="check" value="Check Username"
    onclick="check_user_exist(); return false;">

  <div id="available">
    Username is available!
  </div>

  <div id="not_available">
    Sorry that username is not available.
  </div>


</body>
</html>[/p]

作者：jackxiang@向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除
地址：http://jackxiang.com/post/365/
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