php - How can call a page on submit using ajax? -

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i want create chat room in php using ajax. therefore want call page clicking on submit. have 2 pages chat.php , getchat.php. wrong , how can call getchat.php . have try function not working. please me.

chat.php

    <script>     function showuser() {        xmlhttp.open("get","getchat.php",true);       xmlhttp.send();     }     </script> <form onsubmit="showuser(this.value)" method="post"> <label>name :</label> <input type="text" name="username" /><br /> <textarea name="message"></textarea> <input type="submit" name="submit" /> </form>

getchat.php

<?php $con = mysqli_connect('localhost','root','','ajax'); if (!$con) {   die('could not connect: ' . mysqli_error($con)); }  mysqli_select_db($con,"ajax_demo");  $sql="select * chat"; $result = mysqli_query($con,$sql);  echo "<table border='1'> <tr> <th>name</th> <th>message</th>  </tr>";  while($row = mysqli_fetch_array($result)) {   echo "<tr>";   echo "<td>" . $row['name'] . "</td>";   echo "<td>" . $row['message'] . "</td>";   echo "</tr>"; } echo "</table>";  mysqli_close($con); ?>

i did this

chat.php

<form id="chat_form" method="post"> <label>name :</label> <input type="text" name="username" /><br /> <textarea name="message"></textarea> <input type="submit" name="submit" /> </form> <div id="result"></div>  <script src="jquery-2.1.0.js"></script>  <script>     $(document).ready(function() {      $('#chat_form').submit(function(e){         e.preventdefault();         var data = $("#chat_form").serializearray();          $.ajax({             url: 'getchat.php',             type: "post",             data: data,             success: function(info){                 $("#result").html(info);             },             error:function(){                 $("#result").html('there error while submit');             }             });      }); }); </script>

getchat.php

not changed yours


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