I am trying to populate second dropdown list based on first dropdown list selection using Ajax, jQuery, PHP and MySQL. The problem is the options in second dropdown list just appears in one line (all options in one line)!
I was hoping the while loop inside the results.php could handle this but it seems not. How can I fix this issue?
Here is my code:
<html>
<body>
<?php
$mysqli = new mysqli('localhost', 'root', '', 'chain');
if ($mysqli->connect_errno)
{
die('Unable to connect!');
}
else
{
$query = 'SELECT * FROM Cars';
if ($result = $mysqli->query($query))
{
if ($result->num_rows > 0)
{
?>
<p>
Select a Car
<select id="selectCar">
<option value="select">Please Select From The List</option>
<?php
while($row = $result->fetch_assoc())
{
?>
<option value="<?php echo $row['id']; ?>"><?php echo $row['title']; ?></option>
<?php
}
?>
</select>
</p>
<select>
<option value="select">Please Select From The List</option>
<option id="result"></option>
</select>
<?php
}
else
{
echo 'No records found!';
}
$result->close();
}
else
{
echo 'Error in query: $query. '.$mysqli->error;
}
}
$mysqli->close();
?>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(document).ready(function()
{
$('#selectCar').change(function()
{
if($(this).val() == '') return;
$.get(
'results.php',
{ id : $(this).val() },
function(data)
{
$('#result').html(data);
}
);
});
});
</script>
</body>
</html>
In the PHP result I have:
<?php
$mysqli = new mysqli('localhost', 'root', '', 'chain');
$resultStr = '';
$query = 'SELECT * FROM models WHERE carID='.$_GET['id'];
if ($result = $mysqli->query($query))
{
if ($result->num_rows > 0)
{
while($row = $result->fetch_assoc())
{
$resultStr.= '<option value="'.$row['id'].'">'.$row['model'].'</option>';
}
}
else
{
$resultStr = 'Nothing found';
}
}
echo $resultStr;
?>
You should edit your script into this..
<select id="result">
<option value="select">Please Select From The List</option>
</select>
You are setting $('#result').html(data); in the main file.
result should be the id of the HTML select element, you used it as id for the an option element.
(You are appending the values into the option element, which doesn't create new HTML elements, but they should be inserted into the select element.)
Related
Database Table "Product" has a "Product_Code" and "Product_Name"
We have a form where we fill Product Data
Select options are fetched from Database table column "Product_Code"
<select name="Select_Product_Code" id="Select_Product_Code">
<option value="0">Product</option>
<?php
$con = mysqli_connect('localhost','user1db','userdb','1db');
if (!$con) { die('Could not connect: ' . mysqli_error($con)); }
mysqli_select_db($con,"ajax_demo");
$sql="SELECT * FROM Product";
$result = mysqli_query($con,$sql);
while($row = mysqli_fetch_array($result))
{
?>
<option value = "<?php echo($row['Product_Code'])?>" >
<?php echo($row['Product_Code']);
?>
</option>
<?php
}
?>
</select>
Without Form submit, Is there a way to show "Product_Name" in a Label or TextInput when "Product_Code" is selected ?
Edit , added ajax.
readproduct.php
<!DOCTYPE html>
<html>
<head>
<script>
function showProduct(str) {
if (str=="") {
document.getElementById("txtHint").innerHTML="";
return;
}
if (window.XMLHttpRequest) {
xmlhttp=new XMLHttpRequest();
}
xmlhttp.onreadystatechange=function() {
if (this.readyState==4 && this.status==200) {
document.getElementById("txtHint").innerHTML=this.responseText;
}
}
xmlhttp.open("GET","getproduct.php?q="+str,true);
xmlhttp.send();
}
</script>
</head>
<body>
<form>
<select name="products" onchange="showProduct(this.value)">
<option value="">Select </option>
<option value="1">0001</option>
<option value="2">0002</option>
<option value="3">0003</option>
<option value="4">0004</option>
</select>
</form>
<br>
<div id="txtHint"><b>list</b></div>
</body>
</html>
getproduct.php as follows
<?php
$q = intval($_GET['q']);
$con = mysqli_connect('localhost','user1db','userdb','1db');
if (!$con)
{
die('Could not connect: ' . mysqli_error($con));
}
echo "Connected";
mysqli_select_db($con,"ajax_demo");
$sql="SELECT * FROM Stock WHERE Product_Code = '".$q."'";
$result = mysqli_query($con,$sql);
while($row = mysqli_fetch_array($result))
{
echo $row['Product_Name'];
}
mysqli_close($con);
?>
If we remove where clause, all products names are displayed,
with where clause, getproduct.php does not display Product_Names.
What we missed or did wrong?
You can populate an array inside your while loop that will be used later in a change listener for the select element like so:
<select name="Select_Product_Code" id="Select_Product_Code">
<option value="0">Product</option>
<?php
$con = mysqli_connect('localhost','user1db','userdb','1db');
if (!$con) { die('Could not connect: ' . mysqli_error($con)); }
mysqli_select_db($con,"ajax_demo");
$sql="SELECT * FROM Product";
$result = mysqli_query($con,$sql);
while($row = mysqli_fetch_array($result))
{
// here it adds a name with a key that matches the option-value
$names[$row['Product_Code']] = $row['Product_Name'];
?>
<option value = "<?php echo($row['Product_Code'])?>" >
<?php echo($row['Product_Code']);
?>
</option>
<?php
}
?>
</select>
<input type="text" id="out-text" value="The Name will appear here" />
<!-- then it populates the array with json_encode() to be used in the event-listener (both below) -->
<script type="text/javascript">
var names = <?php echo json_encode($names); ?>;
document.getElementById("Select_Product_Code").addEventListener(
'change',
function() {
document.getElementById("out-text").value = names[this.selectedIndex];
},
false
);
</script>
This is not the only way to do it, but its vanilla javascript/php, and here is a JSFiddle with the basic logic (minus the PHP part)
I want to add part search into a website powered by WordPress. I have currently achieved the function, but I have trouble of integrating it into WordPress. I tried several ways but the dynamic dependent select box still not working.
I followed this tutorial: Dynamic Dependent Select Box using jQuery, Ajax and PHP
Below are my code which works well outside WordPress.
index.php
<head>
<script src="http://code.jquery.com/jquery-3.1.1.min.js"></script>
<script src="js/ajax-ps.js"></script>
</head>
<body>
<form class="select-boxes" action="ps-result.php" method="POST">
<?php
include('dbConfig.php');
$query = $db->query("SELECT * FROM ps_manufact WHERE status = 1 ORDER BY manufact_name ASC");
$rowCount = $query->num_rows;
?>
<select name="manufacturer" id="manufact" class="col-md-2 col-sm-2 col-xs-10" onchange="manufactText(this)">
<option value="">Select Manufacturer</option>
<?php
if($rowCount > 0){
while($row = $query->fetch_assoc()){
echo '<option value="'.$row['manufact_id'].'">'.$row['manufact_name'].'</option>';
}
}else{
echo '<option value="">Manufacturer Not Available</option>';
}
?>
</select>
<input id="manufacturer_text" type="hidden" name="manufacturer_text" value=""/>
<script type="text/javascript">
function manufactText(ddl) {
document.getElementById('manufacturer_text').value = ddl.options[ddl.selectedIndex].text;
}
</script>
<select name="type" id="type" class="col-md-2 col-sm-2 col-xs-10" onchange="typeText(this)">
<option value="">Select Manufacturer First</option>
</select>
<input id="type_text" type="hidden" name="type_text" value=""/>
<script type="text/javascript">
function typeText(ddl) {
document.getElementById('type_text').value = ddl.options[ddl.selectedIndex].text;
}
</script>
<select name="year" id="year" class="col-md-2 col-sm-2 col-xs-10" onchange="yearText(this)">
<option value="">Select Type First</option>
</select>
<input id="year_text" type="hidden" name="year_text" value=""/>
<script type="text/javascript">
function yearText(ddl) {
document.getElementById('year_text').value = ddl.options[ddl.selectedIndex].text;
}
</script>
<select name="model" id="model" class="col-md-2 col-sm-2 col-xs-10" onchange="modelText(this)">
<option value="">Select Year First</option>
</select>
<input id="model_text" type="hidden" name="model_text" value=""/>
<script type="text/javascript">
function modelText(ddl) {
document.getElementById('model_text').value = ddl.options[ddl.selectedIndex].text;
}
</script>
<input type="submit" name="search" id="search" class="col-md-2 col-sm-2 col-xs-10" value="Search">
</form>
</body>
ajax-ps.js
$(document).ready(function(){
$('#manufact').on('change',function(){
var manufactID = $(this).val();
if(manufactID){
$.ajax({
cache: false,
type:'POST',
url:'ajax-data.php',
data:'manufact_id='+manufactID,
success:function(type_data){
$('#type').html(type_data);
$('#year').html('<option value="">Select Type First</option>');
}
});
}else{
$('#type').html('<option value="">Select Manufact First</option>');
$('#year').html('<option value="">Select Type First</option>');
}
});
$('#type').on('change',function(){
var typeID = $(this).val();
if(typeID){
$.ajax({
cache: false,
type:'POST',
url:'ajax-data.php',
data:'type_id='+typeID,
success:function(year_data){
$('#year').html(year_data);
$('#model').html('<option value="">Select Year First</option>');
}
});
}else{
$('#year').html('<option value="">Select Type First</option>');
$('#model').html('<option value="">Select Year First</option>');
}
});
$('#year').on('change',function(){
var yearID = $(this).val();
if(yearID){
$.ajax({
cache: false,
type:'POST',
url:'ajax-data.php',
data:'year_id='+yearID,
success:function(model_data){
$('#model').html(model_data);
}
});
}else{
$('#model').html('<option value="">Select Year First</option>');
}
});
});
ajax-data.php
include('dbConfig.php');
if(isset($_POST["manufact_id"]) && !empty($_POST["manufact_id"])){
$query = $db->query("SELECT * FROM ps_type WHERE manufact_id = ".$_POST['manufact_id']." AND status = 1 ORDER BY type_name ASC");
$rowCount = $query->num_rows;
if($rowCount > 0){
echo '<option value="">Select Type</option>';
while($row = $query->fetch_assoc()){
echo '<option value="'.$row['type_id'].'">'.$row['type_name'].'</option>';
}
}else{
echo '<option value="">Type Not Available</option>';
}
}
if(isset($_POST["type_id"]) && !empty($_POST["type_id"])){
$query = $db->query("SELECT * FROM ps_year WHERE type_id = ".$_POST['type_id']." AND status = 1 ORDER BY year_name ASC");
$rowCount = $query->num_rows;
if($rowCount > 0){
echo '<option value="">Select Year</option>';
while($row = $query->fetch_assoc()){
echo '<option value="'.$row['year_id'].'">'.$row['year_name'].'</option>';
}
}else{
echo '<option value="">Year Not Available</option>';
}
}
if(isset($_POST["year_id"]) && !empty($_POST["year_id"])){
$query = $db->query("SELECT * FROM ps_model WHERE year_id = ".$_POST['year_id']." AND status = 1 ORDER BY model_name ASC");
$rowCount = $query->num_rows;
if($rowCount > 0){
echo '<option value="">Select Model</option>';
while($row = $query->fetch_assoc()){
echo '<option value="'.$row['model_id'].'">'.$row['model_name'].'</option>';
}
}else{
echo '<option value="">Model Not Available</option>';
}
}
Now the problem is, when select the first box, the second one becomes empty, nothing is returned from the database:
Capture - After select the first box
Really appreicate Christos Lytras to help me solve the previous problem.
I have a new problem with action="ps-result.php" in the line <form class="select-boxes" action="ps-result.php" method="POST">.
ps-result.php
<?php
if (isset($_POST['search'])) {
$clauses = array();
if (isset($_POST['manufacturer_text']) && !empty($_POST['manufacturer_text'])) {
$clauses[] = "`manufacturer` = '{$_POST['manufacturer_text']}'";
}
if (isset($_POST['type_text']) && !empty($_POST['type_text'])) {
$clauses[] = "`type` = '{$_POST['type_text']}'";
}
if (isset($_POST['year_text']) && !empty($_POST['year_text'])) {
$clauses[] = "`year` = '{$_POST['year_text']}'";
}
if (isset($_POST['model_text']) && !empty($_POST['model_text'])) {
$clauses[] = "`model` = '{$_POST['model_text']}'";
}
$where = !empty( $clauses ) ? ' where '.implode(' and ',$clauses ) : '';
$sql = "SELECT * FROM `wp_products` ". $where;
$result = filterTable($sql);
}
else {
$sql = "SELECT * FROM `wp_products` WHERE `manufacturer`=''";
$result = filterTable($sql);
}
function filterTable($sql) {
$con = mysqli_connect("localhost", "root", "root", "i2235990_wp2");
if (!$con) {
die('Could not connect: ' . mysqli_error($con));
}
$filter_Result = mysqli_query($con, $sql);
return $filter_Result;
}
?>
<?php get_header(); ?>
<div class="container">
...
</div>
<?php get_footer(); ?>
Now when I click Search, it returns
Fatal error: Call to undefined function get_header() in /Applications/MAMP/htdocs/wordpress/wp-content/themes/myTheme/inc/ps-result.php on line 42.
The proper way to do this, is to create a wordpress shortcode and then use that shortcode wherever you want, page or post, but if you want to create something more specific, then you should create a small wordpress plugin. I won't get into this, but it’s really not a big deal to create a simple wordpress plugin having such functionality. I’ll go through the steps on how you can have this working in wordpress with the files and the code you already have.
I assume you already have the tables of your example created. My tables are like this:
wp_citytours_dynsel_cities
wp_citytours_dynsel_states
wp_citytours_dynsel_countries
I have imported some data and I have all those tables filled with proper data. I can provide some sql files if you like, but I assume you already have your tables filled with the proper data for each table.
My test theme root directory is:
/wp-content/themes/citytours/
I have created the directory under my theme root directory and I have included all the code files there, so we have 3 files:
/wp-content/themes/citytours/dynsel/index-partial.php
<?php
//Include database configuration file
include('dbConfig.php');
//Get all country data
$query = $db->query("SELECT * FROM wp_citytours_dynsel_countries WHERE status = 1 ORDER BY country_name ASC");
//Count total number of rows
$rowCount = $query->num_rows;
?>
<select name="country" id="country">
<option value="">Select Country</option>
<?php
if($rowCount > 0){
while($row = $query->fetch_assoc()){
echo '<option value="'.$row['country_id'].'">'.$row['country_name'].'</option>';
}
}else{
echo '<option value="">Country not available</option>';
}
?>
</select>
<select name="state" id="state">
<option value="">Select country first</option>
</select>
<select name="city" id="city">
<option value="">Select state first</option>
</select>
<script type="text/javascript">
jQuery(function($) {
$('#country').on('change',function(){
var countryID = $(this).val();
if(countryID){
$.ajax({
type:'POST',
url:'<?php echo home_url('wp-content/themes/citytours/dynsel/ajaxData.php') ?>',
data:'country_id='+countryID,
success:function(html){
$('#state').html(html);
$('#city').html('<option value="">Select state first</option>');
}
});
}else{
$('#state').html('<option value="">Select country first</option>');
$('#city').html('<option value="">Select state first</option>');
}
});
$('#state').on('change',function(){
var stateID = $(this).val();
if(stateID){
$.ajax({
type:'POST',
url:'<?php echo home_url('wp-content/themes/citytours/dynsel/ajaxData.php') ?>',
data:'state_id='+stateID,
success:function(html){
$('#city').html(html);
}
});
}else{
$('#city').html('<option value="">Select state first</option>');
}
});
});
</script>
/wp-content/themes/citytours/dynsel/dbConfig.php
<?php
//db details
$dbHost = 'localhost';
$dbUsername = 'xxxx';
$dbPassword = 'xxxx';
$dbName = 'xxxx';
//Connect and select the database
$db = new mysqli($dbHost, $dbUsername, $dbPassword, $dbName);
if ($db->connect_error) {
die("Connection failed: " . $db->connect_error);
}
?>
/wp-content/themes/citytours/dynsel/ajaxData.php
<?php
//Include database configuration file
include('dbConfig.php');
if(isset($_POST["country_id"]) && !empty($_POST["country_id"])){
//Get all state data
$query = $db->query("SELECT * FROM wp_citytours_dynsel_states WHERE country_id = ".$_POST['country_id']." AND status = 1 ORDER BY state_name ASC");
//Count total number of rows
$rowCount = $query->num_rows;
//Display states list
if($rowCount > 0){
echo '<option value="">Select state</option>';
while($row = $query->fetch_assoc()){
echo '<option value="'.$row['state_id'].'">'.$row['state_name'].'</option>';
}
}else{
echo '<option value="">State not available</option>';
}
}
if(isset($_POST["state_id"]) && !empty($_POST["state_id"])){
//Get all city data
$query = $db->query("SELECT * FROM wp_citytours_dynsel_cities WHERE state_id = ".$_POST['state_id']." AND status = 1 ORDER BY city_name ASC");
//Count total number of rows
$rowCount = $query->num_rows;
//Display cities list
if($rowCount > 0){
echo '<option value="">Select city</option>';
while($row = $query->fetch_assoc()){
echo '<option value="'.$row['city_id'].'">'.$row['city_name'].'</option>';
}
}else{
echo '<option value="">City not available</option>';
}
}
?>
As you can see, the index-partial.php now contains only needed code, without <body>, <head> and script files included. Wordpress already includes jQuery to the application for most themes, but you should always check that.
Now, you can add the functionality wherever you want, even at the theme index.php file, but always with caution. I have used theme's single post template file, which is single-post.php. I have included the example code, under the main post body inside a div. I just include the index-partial.php like this:
<div class="<?php echo esc_attr( $content_class ); ?>">
<div class="box_style_1">
...
</div><!-- end box_style_1 -->
<div class="box_style_1">
<?php include(__DIR__.'/dynsel/index-partial.php'); ?>
</div>
</div><!-- End col-md-9-->
I also have used the wordpress home_url function, to have a proper url rooted for the ajaxData.php file like this:
url:'<?php echo home_url('wp-content/themes/citytours/dynsel/ajaxData.php') ?>'
Now, if you have followed all these steps, then you should have your code example working at under each post. You can now included it wherever you want by using that line of code <?php include(__DIR__.'/dynsel/index-partial.php'); ?>.
Please let me know if that worked for you.
I have this select , i wanna save each value after change , save it and use in other select
This is my code :
<?
$sql = "SELECT * FROM championnat ";
$result = $conn->query(sprintf($sql));
if($result){
if ($result->num_rows != 0)
{
$rows=array();
?>
<select name="nom_championnat" id="nom_championnat" >
<option value=""></option>
<?php
while($r=mysqli_fetch_assoc($result))
{
?>
<option value=" <?php echo $r['idChampionnat']?>" name="nom_championnat" selected >
<?php echo $r['nomChampionnat'] ?></option>
<?php
}
}
}
?>
</select>
</div>
I need the variable $r['idChampionnat'] to save it in each select and use it in this requete , how can it asve and put it in that requete sql ????
<?php
$sql = "SELECT * FROM equipe where idChampionnat=???? ";
$result = $conn->query(sprintf($sql));
if($result){
if ($result->num_rows != 0)
{
$rows=array();
?>
<select name="equipe1" >
<option value=""></option>
<?php
while($r=mysqli_fetch_assoc($result))
{
?>
<option required value=" <?php echo $r['nomEquipe']?>" name="equipe1" selected ><?php echo $r['nomEquipe'] ?>
</option>
<?php
}
}
}
?>
</select>
just to clear it ,
You need to use jQuery to fire an AJAX call when the first box is selected.
Its been a while since I've done this but this should give you some idea. I took some code from here and here as example
Say your html looks like this
<select id="nom_championnat">
<option value="value1">value1</option>
<option value="value2">value2</option>
</select>
<select id="equipe1"></select>
then you need to tell jquery what to do when nom_championnat changes selection
$('#nom_championnat').change(function() {
var data = "";
$.ajax({
type:"POST",
url : "queryfile.php",
data : "value="+$(this).val(),
async: false,
success : function(response) {
data = response;
return response;
},
error: function() {
alert('Error occured');
}
});
var string = data.message.split(",");
var array = string.filter(function(e){return e;});
var select = $('equipe1');
select.empty();
$.each(array, function(index, value) {
select.append(
$('<option></option>').val(value).html(value)
);
});
});
and then you need a queryfile.php to handle the ajax requests, something like
<?php
print_r($_POST);
$value = $_POST["value"];
$sql = "select where {$value} ..."
$result = execute($sql);
echo $result;
?>
I have 3 select drop downs which I want when the first one selected, the second shows up, and when the second is selected, the third one shows up, by using if(isset($_post[first_one])) and for the third one using if(isset($_post[second_one]))
SQL:
$conn = new mysqli($servername, $username, $password, $dbname);
$sql = "SELECT * FROM sp_meeting_log ";
$result1 = $conn->query($sql);
PHP/HTML:
<div style="position:absolute; top:300px; left:500px;">
<form method="post">
<p>Choose:</p>
<!--Get all orgs ,forums ,Users data available for admin-->
//select the first
<select style="display:inline-block;" name="org">
<option value="All Orgs">All Orgs</option>
//first drop down info release
<?php
if ($result1->num_rows > 0) {
echo "<table><tr><th>orgID</th><th>orgName</th></tr>";
// output data of each row
while($row = $result1->fetch_assoc()) {
echo "<option>" .$row["orgID"]." /".$row["orgName"]."</option>";
}
echo "</table>";
} else {
echo "0 results";
}
?>
</select>
<select style="display:inline-block;" name="forum">
<option value="forum1"><h5>All Forums</h5></option>
<?php
// if the first dropdown post set
if(isset($_POST['org'])){
$result2 = $conn->query($sql);
if ($result2->num_rows > 0) {
echo "<table><tr><th>forumID</th><th>forumName</th></tr>";
// output data of each row
while($row = $result2->fetch_assoc()) {
echo "<option>".$row["forumID"]." / ".$row["forumName"]."</option>";
}
echo "</table>";
} else {
echo "0 results";
}
}
?>
</select>
//select the second
<select style="display:inline-block;" name="user">
<option><h5>All Users</h5></option>
<?php
// if the second drop down is set
if(isset($_POST['forum'])){
$result3 = $conn->query($sql);
if ($result3->num_rows > 0) {
echo "<table><tr><th>userID</th><th>username</th></tr>";
// output data of each row
while($row = $result3->fetch_assoc()) {
echo "<option>".$row["userID"]." / ".$row["username"]. "</option>";
}
echo "</table>";
} else {
echo "0 results";
}
}
?>
Essentially this is what the idea is. You want page one to just fetch from page two and post the result back to page one into the correct spots:
page1.php
<script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.js"></script>
<form>
<label>Org
<select id="org" name="org">
<option value="1">One</option>
<option value="2">Two</option>
</select>
</label>
<!-- This is where the forum html will drop into after ajax runs -->
<div id="forum"></div>
<!-- This is where the user html will drop into after ajax runs -->
<div id="user"></div>
</form>
<script type="text/javascript">
$(document).ready(function() {
// On change of a select menu
$(this).on('change','select',function(e){
// Assign selection
var thisSelect = $(this);
// Get the id name, this will tell page two
// what it's receiving
var sendType = thisSelect.attr('id');
// Get the actual value of the selection
var sendVal = thisSelect.val();
// Create essentially a POST
var sendData = { field: sendType, value: sendVal };
$.ajax({
// Send to page 2
url : '/page2.php',
// Use post method
type: "POST",
// Use post data from above
data : sendData,
// This is what will run on success
success:function(response){
// Parse the json coming back for placement
var jSon = JSON.parse(response);
// Save the correct html into the correct drop spot
$('#'+jSon.type).html(jSon.html);
},
error: function(response){
console.log(response);
}
});
});
});
</script>
page2.php
if(!empty($_POST)) {
$data = '';
ob_start();
if(isset($_POST['field'])) {
if($_POST['field'] == 'org') {
$type = 'forum';
?>
<label>Forum
<select id="forum" name="forum">
<option value="1">One</option>
<option value="2">Two</option>
</select>
</label>
<?php
}
elseif($_POST['field'] == 'forum') {
$type = 'user';
?>
<label>user
<select id="user" name="user">
<option value="1">One</option>
<option value="2">Two</option>
</select>
</label>
<?php }
$data = ob_get_contents();
ob_end_clean();
die(json_encode(array('type'=>$type,'html'=>$data)));
}
die(json_encode(array('type'=>'error','html'=>false)));
}
I am trying to run this tutorial from PHP Jquery cookbook but the First combo box is not populating with country data and it is empty!
I have 4 tables in the database and I have checked them and they are all good!
tables are: Country, States, Towns, and Towninfo
In my html I have:
<html>
<head>
</head>
<body>
<ul>
<li>
<strong>Country</strong>
<select id="countryList">
<option value="">select</option>
</select>
</li>
<li>
<strong>State</strong>
<select id="stateList">
<option value="">select</option>
</select>
</li>
<li>
<strong>Town</strong>
<select id="townList">
<option value="">select</option>
</select>
</li>
</ul>
<p id="information"></p>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(document).ready(function()
{
$('select').change(getList);
getList();
function getList()
{
var url, target;
var id = $(this).attr('id');
var selectedValue = $(this).val();
switch (id)
{
case 'countryList':
if(selectedValue == '') return;
url = 'results.php?find=states&id='+ selectedValue;
target = 'stateList';
break;
case 'stateList':
if($(this).val() == '') return;
url = 'results.php?find=towns&id='+ selectedValue;
target = 'townList';
break;
case 'townList':
if($(this).val() == '') return;
url = 'results.php?find=information&id='+ selectedValue;
target = 'information';
break;
default:
url = 'results.php?find=country';
target = 'countryList';
}
$.get(
url,
{ },
function(data)
{
$('#'+target).html(data);
}
)
}
});
</script>
</body>
</html>
and in the php file I have:
<?php
$mysqli = new mysqli('localhost', 'root', '', 'chain');
$find = $_GET['find'];
switch ($find)
{
case 'country':
$query = 'SELECT id, countryName FROM country';
break;
case 'states':
$query = 'SELECT id, stateName FROM states WHERE countryId='.$_GET['id'];
break;
case 'towns':
$query = 'SELECT id, townName FROM towns WHERE stateId='.$_GET['id'];
break;
case 'information':
$query = 'SELECT id, description FROM towninfo WHERE townId='.$_GET['id'] .' LIMIT 1';
break;
}
if ($mysqli->query($query))
{
$result = $mysqli->query($query);
if($find == 'information')
{
if($result->num_rows > 0)
{
$row = $result->fetch_array();
echo $row[1];
}
else
{
echo 'No Information found';
}
}
else
{
?>
<option value="">select</option>
<?php
while($row = $result->fetch_array())
{
?>
<option value="<?php echo $row[0]; ?>"><?php echo $row[1]; ?> </option>
<?php
}
}
}
?>
According to book the first combobox must be populated after the page has been loaded but the I do not know why it is empty! can you please let me know why this is happening!
Calling:
getList();
after your page loaded won't work as it does not have right context of value "this".
You can try to use:
$('select').trigger("change");
instead of getList(); for first time loading
or another way to try:
$(document).ready(function(){
$('select').change(getList);
getList.call($('select'));
function getList(){...}
}
this should set the right context.(but I'm not 100% sure if it will work, as haven't tried to make fiddle.)