javascript - changing a textbox value when selected index from a combobox -

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i have combobox has data fetched database. when index selected combobox, textbox value gets value database depending on index selected combobox. have following codes.

<form action = '' method = "post">   <b> school id: </b><br />   <select name = "school_id" required id = "schoold_id" onchange="get_data(this.value)">   <option value = "" selected></option>   <?php    $sql = "select distinct school_id school";   $result = $db->query($sql);   if ($result->num_rows > 0){         while($row = $result->fetch_assoc()){               echo "<option value = ".$row["school_id"].">".$row["school_id"]."</option>";         }   }   ?>   </select><br /><br />   <b> batch number: </b><br />   <input type= "text" name = "batch_no" /required><br /><br />   <b> school name: </b><br />   <input type= "text" name = "school_name" /readonly><br /><br />   <input type = "submit" value = " submit "/><br />   </form>

the combobox here school id , textbox needs changed school name.

i tried using javascript , here used.

<script> function get_data(value){ $.ajax({     url: "ajax.php",     type: "post",     datatype: "html",     async: false,     data: {value: value}     success: function(data) {        //here can populate required fields based on value database                     }  }); }</script>

and ajax file

<?php include "connect.php"; $myschoolid = (filter_input(input_post, 'school_id'));  $sql = $db->prepare('select school_name main school_id = ?'); $sql->bind_param('i', $myschoolid); $sql->execute(); $result = $sql->get_result(); if ($result->numrows >0){     while ($row = $result->fetch_assoc()){         $newschoolid = $row["school_name"];     }     echo $newschoolid; } ?>

i'm doing wrong here. i'm not entirely familiar ajax. appreciate help.


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