AJAX Form Submit and Update From Database

savagenoob · December 1, 2009

OK, I am trying to create a page (car insurance based) that a user can add drivers via AJAX and the page would display each driver submitted with the form. If i just echo something it works, the database is updated, but I cant display all the drivers in the database with AJAX. So if there is 3 drivers, I want the page to update as the drivers are added. Here is the scripts

Java and Form:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<head>
</head>
<script type="text/javascript" language="javascript">
   var http_request = false;
   function makePOSTRequest(url, parameters) {
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
         }
      } else if (window.ActiveXObject) { // IE
         try {
            http_request = new ActiveXObject("Msxml2.XMLHTTP");
         } catch (e) {
            try {
               http_request = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {}
         }
      }
      if (!http_request) {
         alert('Cannot create XMLHTTP instance');
         return false;
      }
      
      http_request.onreadystatechange = alertContents;
      http_request.open('POST', url, true);
      http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http_request.setRequestHeader("Content-length", parameters.length);
      http_request.setRequestHeader("Connection", "close");
      http_request.send(parameters);
   }

   function alertContents() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            //alert(http_request.responseText);
            result = http_request.responseText;
            document.getElementById('myspan').innerHTML = result;            
         } else {
            alert('There was a problem with the request.');
         }
      }
   }
   
   function get(obj) {
      var poststr = "firstname=" + encodeURI( document.getElementById("firstname").value ) +
                    "&middlename=" + encodeURI( document.getElementById("middlename").value ) +
				"&lastname=" + encodeURI( document.getElementById("lastname").value );
      makePOSTRequest('adddriver.php', poststr);
   }
</script>


<form action="javascript:get(document.getElementById('myform'));" name="myform" id="myform">
<tr><th colspan = "%100">Drivers</th></tr>
<form id="driver" onsubmit="return false;">
<tr><td>First Name:</td><td><input type="text" name="firstname" id="firstname" ></td><td>Middle Name:</td><td><input type="text" name="middlename" id="middlename" ></td><td>Last Name:</td><td><input type="text" name="lastname" id="lastname" ></td></tr>
<br>
<input type="button" name="button" value="Submit" 
   onclick="javascript:get(this.parentNode);">
</form>

<br><br>
Drivers:<br>
<hr>
<span name="myspan" id="myspan"></span>
<hr>

</body>

The Server Page:

<?php
require_once('config.php');
//Array to store validation errors
$errmsg_arr = array();

//Validation error flag
$errflag = false;

//Connect to mysql server
$link = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);
if(!$link) {
	die('Failed to connect to server: ' . mysql_error());
}

//Select database
$db = mysql_select_db(DB_DATABASE);
if(!$db) {
	die("Unable to select database");
}
if($_POST["firstname"] == "")
echo "name is empty";
else
$firstname = $_POST["firstname"];
$middlename = $_POST["middlename"];
$lastname = $_POST["lastname"];
$query = "INSERT INTO drivers (firstname, middlename, lastname) VALUES ('$firstname', '$middlename', '$lastname')";
$result = mysql_query($query) or die(mysql_error());
$driverres = mysql_query("SELECT * FROM drivers") or die(mysql_error());
while($row = mysql_fetch_array('$driverres')){
echo $row['firstname'] . " " . $row['middlename'] . " " . $row['lastname']; 
}
?>

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AJAX Form Submit and Update From Database

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