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ajax drop down selection data load with php mysql
php code / November 12, 2018

In this instructional exercise, you will figure out how to make a dynamic drop-down choice to stack information with jQuery, PHP, and MySQL. The unique drop-down generally used to show related information. In this instructional exercise, we will carry out a drop-down of the worker to show representative subtleties on worker name choice. The drop-down choice information load took care of on choice without page reload utilizing Ajax

(1)script/getData.js

$(document).ready(function(){ 
// code to get all records from table via select box
$("#employee").change(function() {   
var id = $(this).find(":selected").val();
var dataString = 'empid='+ id;   
$.ajax({
url: 'getEmployee.php',
dataType: "json",
data: dataString, 
cache: false,
success: function(employeeData) {
   if(employeeData) {
$("#heading").show();  
$("#no_records").hide(); 
$("#emp_name").text(employeeData.employee_name);
$("#emp_age").text(employeeData.employee_age);
$("#emp_salary").text(employeeData.employee_salary);
$("#records").show(); 
} else {
$("#heading").hide();
$("#records").hide();
$("#no_records").show();
}    
}
});
  })
});

(2)config.php

/* Database connection start */
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "phpzag_demos";
$conn = mysqli_connect($servername, $username, $password, $dbname) or die("Connection failed: " . mysqli_connect_error());
if (mysqli_connect_errno()) {
    printf("Connect failed: %sn", mysqli_connect_error());
    exit();
}

(3)getEmployee.php

include_once("config.php");
if($_REQUEST['empid']) {
$sql = "SELECT id, employee_name, employee_salary, employee_age FROM employee WHERE id='".$_REQUEST['empid']."'";
$resultset = mysqli_query($conn, $sql) or die("database error:". mysqli_error($conn));
$data = array();
while( $rows = mysqli_fetch_assoc($resultset) ) {
$data = $rows;
}
echo json_encode($data);
} else {
echo 0; 
}

(4)header.php

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<!-- jQuery -->

(5)index.php

include_once("config.php");
if(isset($_POST['submit']))
{ 
}
?>
<table border="2" align="center">
<form action="" method="POST">
<h2 align="center">Employees Details</h2> 
<tr>
<td>
Employee Name
</td>
<td>
<select name="employee_name" required>
<option value="" selected="selected">Select Employee Name</option>
<?php
$sql = "SELECT * FROM users";
$resultset = mysqli_query($conn, $sql) or die("database error:". mysqli_error($conn));
while( $rows = mysqli_fetch_assoc($resultset) ) {?>
<option value="<?php echo $rows["id"]; ?>"><?php echo $rows["employee"]; ?></option>
<?php } ?>
</select>
</td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" name="submit" value="Config">
</td>
</tr>
</form>
</table>

(6) index_a.php

include('header.php');
include_once("config.php");
?>
<script type="text/javascript" src="script/getData.js"></script>
<div class="container">
<h2>Employees Details</h2> 
<div class="page-header">
        <h3>
        <select id="employee">
        <option value="" selected="selected">Select Employee Name</option>
<?php
$sql = "SELECT id, employee_name, employee_salary, employee_age FROM employee LIMIT 10";
$resultset = mysqli_query($conn, $sql) or die("database error:". mysqli_error($conn));
while( $rows = mysqli_fetch_assoc($resultset) ) { 
?>
<option value="<?php echo $rows["id"]; ?>"><?php echo $rows["employee_name"]; ?></option>
<?php } ?>
</select>
        </h3> 
        </div> 
<div id="display">
<div class="row" id="heading" style="display:none;"><h3><div class="col-sm-4"><strong>Employee Name</strong></div><div class="col-sm-4"><strong>Age</strong></div><div class="col-sm-4"><strong>Salary</strong></div></h3></div><br> 
<div class="row" id="records"><div class="col-sm-4" id="emp_name"></div><div class="col-sm-4" id="emp_age"></div><div class="col-sm-4" id="emp_salary"></div></div> 
<div class="row" id="no_records"><div class="col-sm-4">Plese select employee name to view details</div></div>
        </div> 
</div>
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