Develop Reference

POST method in wordpress

I trying to make opening WP posts in popup.
Firts part of code its form in posts loop where I get query of posts what should be opened
<form id="postForm" method="POST">
<input id="postQuery" style="display: none" name="postQuery" value="<?php echo get_the_ID() ?>">
<input id="sendQueryBtn" data-toggle="modal" data-target="#exampleModalLong" type="submit" value="<?php the_title(); ?>">
</form>
Next is my JS, where I do query check by alert
$(document).ready(function () {
$("form").submit(function () {
let xuinya = $(this).serialize();
$.ajax({
type: "POST",
url: '.../footer.php',
data: xuinya,
success: function (data) {
alert(xuinya)
},
error: function (jqXHR, text, error) {
$('#modalBody').html(error);
}
});
return false;
});});
And I final, here is part of HTML with modal, where I try to use POST
<div id="modalBody" class="modal-body">
<?php
echo $_POST["postQuery"];
echo apply_filters( 'the_content', get_post( $_POST["postQuery"] )->post_content );
?>
</div>
My problem is because when I check query in JS - qet alert message with correct value, but in php I always qet simple "1".

I don't get why you posting to footer.php, I think its should be admin-ajax.php
just simply add to youfooter.php
<script>
var ajax_url = "<?php echo admin_url( 'admin-ajax.php' ); ?>";
</script>
Change url value in js to ajax_url, make sure hat with data you posting variable action and then create function in functions.php, something like this(if you sending action value as 'get_pop_posts')
add_action( 'wp_ajax_get_pop_posts', 'get_pop_posts_init' );
add_action( 'wp_ajax_nopriv_get_pop_posts', 'get_pop_posts_init' );
function get_pop_posts_init() {
$data = $_POST;
print_r($data);
die();
}

Ajax request : get text from database and display in div

My goal is to perform an AJAX request when clicking on a button to retrieve "name" and "story" stored in my database. Each button will get info of another hero.
I'm working on multiple files.
With my current code (which is the closer to what seems to be correct in my mind) the switchHeroInfo will always change the text to "TestName" and "StoryName" instead of "Gertrude" "An old lady"(stored in database).
Can you enlight me on what may be the cause of my struggles?
the php file for connecting to database : connect_database.php
<?php
try
{
$bdd = new PDO('mysql:host=localhost;dbname=biomass;charset=utf8', 'root', '', array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));
}
catch(Exception $e)
{
die('Error : '.$e->getMessage());
}
?>
The Javascript part :
$(document).ready(function()
{
$(".hero_portrait").click(function()
{
var index = $(this).data("id");
$.ajax(
{
type: "POST",
url: "../php/get_data.php",
data: {newIndex:index},
success: function(data)
{
// Display {"nick":"Gertrude","0":"Gertrude","story":"Vieille folle senile","1":"Vieille folle senile"}
alert(data);
//Display : undefined
alert(data.story);
$("#hero_name").html(data.nick);
$("#hero_story").html(data.story);
},
error: function()
{
alert("Request failure");
}
});
});
});
The php file : get_data.php
<?php
$tempValue = $_POST['newIndex'];
$sql = $bdd->prepare('SELECT * FROM heroes WHERE ID = :indexValue');
$sql->bindParam(":indexValue", $tempValue, PDO::PARAM_STR);
$sql->execute();
while($data = $sql->fetch())
{
?>
<script>
$heroNameTemp = <?php echo json_encode($data["name"]); ?>;
$heroStoryTemp = <?php echo json_encode($data["story"]); ?>;
</script>
<?php
}
$sql->closeCursor();
?>
Finally the HTML relative to the current problem:
<div id="squad_portraits">
<div class="hero_portrait" id="1"></div>
<div class="hero_portrait" id="2"></div>
<div class="hero_portrait" id="3"></div>
<div class="hero_portrait" id="4"></div>
</div>
<div id="hero_info">
<h2 id="hero_name">Hero_Name</h2>
<p id="hero_story"> Hero_Description</p>
</div>
If i switch my sql request :
$tempValue = $_POST['newIndex'];
$sql = $bdd->prepare('SELECT * FROM heroes WHERE ID = :indexValue');
to this
$tempValue = 4;
$sql = $bdd->prepare('SELECT * FROM heroes WHERE ID = 4');
AND add the following to my HTML file
<?php include("../php/get_data.php"); ?>
everything works but my index will always be "4".

There are several issues and missunderstandings in your code.
first, in ajax change data to this:
data: {newIndex:index}, // remove the (), simple syntax misstake
This should solve the sql problem.
Now the get_data.php:
<?php
// including db connection is missing here for $bdd
// You should add a test here, wether you've received any and correct data in 'newIndex'
if(empty($_POST['newIndex']) {
// throw an error, send that back to ajax (with a fitting http response code) and exit script
http_response_code(400);
$error = new stdClass();
$error->msg = "Parameter newIndex was missing";
header('Content-Type: application/json'); // tell the browser that there is some json coming!
echo json_encode($error);
exit;
}
$tempValue = $_POST['newIndex'];
// only select the values you need (name, story)
$sql = $bdd->prepare('SELECT name, story FROM heroes WHERE ID = :indexValue');
$sql->bindParam(":indexValue", $tempValue, PDO::PARAM_STR);
$sql->execute();
$data = $sql->fetch(); // if you only expect/need one row, no while is needed
// echo ONE json string as plain string:
header('Content-Type: application/json'); // tell the browser that there is some json coming!
echo json_encode($data);
Now you receive content of $data as a json as param (data) in the success-callback of your ajax, which you can use like this:
success: function(data){
$("#hero_name").html(data.name);
$("#hero_story").html(data.story);
}
Finally let's change storing the item's id from the id attribute to the data-attribute:
In html:
<div class="hero_portrait" data-id="1"></div>
<div class="hero_portrait" data-id="2"></div>
and in javascript change
var index = $(this).attr("id");
to
var index = $(this).data("id"); // $(this).attr("data-id"); will also work

Joomla Ajax jQuery

Hello!
I have a problem with my "custom" pagination for component in joomla.
I wanted to do list of user's articles which will shows for an example 3 posts per page. My goal was to make pagination without refreshing webpage. Ajax was the best choice. I'm fighting with it right now and have the most difficult problem so far (I tried to search answer of my problem several hours).
user.php
<div class="userRightContainer">
<div class="blogArticlesBlock">
<div class="userItemTagsBlock"><b>Debaty na forum użytkownika(<?php echo $joomla_rows; ?>)</b></div>
<?//artykuly joomla
?>
<div id="Joomla_block" class="Joomla_block">
<? require_once("Db_joomla.php") ?>
</div>
...
...
...
<script type="text/javascript">
function jm_previous(arg) {
if(arg < 0)
changePagination(0);
else
changePagination(arg);
}
function jm_next(argument) {
changePagination(argument);
}
function changePagination(pageId){
// $("#Joomla_block").html('');
jQuery.ajax({
type: "GET",
// url: "Db_joomla.php",
url: window.location.href,
data: { jm_start: pageId},
success: function(result){
alert(result);
$("#Joomla_block").html(result);
}
});
}
</script>
Db_joomla.php
defined('_JEXEC') or die;
//
$offset_jm=$_GET["jm_start"];
if(empty($offset_jm)) $offset_jm=0;
//
$db = JFactory::getDbo();
$query = $db->getQuery(true);
$query->select($db->quoteName(array('id', 'title', 'introtext', 'created_by', 'state')));
$query->from($db->quoteName('#__content'));
$query->where($db->quoteName('created_by') . ' LIKE ' . $db->quote(JRequest::getInt('id')));
$query->where('state', '1');
$query->setLimit($joomla_page,$offset_jm);
$db->setQuery($query);
$joomla=$db->loadObjectList();
$joomla_rows = $db->loadResult();
if($joomla_rows > 0){
foreach($joomla as $row) {
if ($row->created_by != JRequest::getInt('id')) continue;
?>
<div class="articlesBlock" style="margin: 5px;">
<!-- Avatar -->
<img src="<?php echo $this->user->avatar; ?>" alt="<?php echo htmlspecialchars($this->user->name, ENT_QUOTES, 'UTF-8'); ?>" style="width:50px; height:auto;border: 1px solid #ccc; float:left;margin: 5px;" />
<div class="blogArticlestTitle" style="padding-left:60px;font-weight:bold;word-wrap:break-word;"><?php echo $row->title ?></div>
<div class="blogArticlesDescription" style="padding: 5px;padding-top:10px;"><?php if (str_word_count($row->introtext) > 100) echo /* Wstawia komentarz i ogranicza tekst do stu znaków, po czym dodaje kropki.*/ substr(strip_tags($row->introtext), 0, 100) . "..."; else echo strip_tags($row->introtext);?>
</div>
<div class="CommentViewMore">
Przejdź do artykułu ›
</div>
</div>
<?php
/*
$item_counting++;
if($item_counting == 5) break;*/
}
//echo $pageNav->getListFooter( ); //Displays a nice footer
?>
<ul class="pager">
<li><<</li>
<li>>></li>
</ul>
<a class ="view_more_link"href="http://konfederaci.pl/index.php/component/komento/profile/id/<?php echo JRequest::getInt('id');?>" title="Artykuły użytkownika">Zobacz wszystkie artykuły</a>
<?php
}
else
{
echo "Ten użytkownik nie posiada żadnych postów na forum.";
}
Now some pictures:
From alert(result)
From google chrome's console
Ps:
If I choose "url : "Db_joomla.php" in this script it won't make anything. still doesn't work (and the same exception).

It's always a better idea to rely on Joomla's Ajax interface rather than implementing yours. It is super simple and very efficient and it works. We have written on how to use it here.
Essentially you will create/modify a simple module that will contain a function (that has the word Ajax at the end of its name) that will be used to process the call.
Then, you will need to add a simple jquery code that will call the module through the com_ajax interface. Note that you will need to make sure to have the module assigned to a menu item because you will need the ID of that menu item for the ajax call.

Simply practics:
Your ajax backend part should be contains only PHP code. (Get DB query).
Next this PHP should return JSON array with results.
You get this JSON for ajax request and push this data for your view.
For simply I use my plugin "plg_ajax" (after install see method onAjaxAjax()).
Example script post for this plugin with com_ajax:
type: "POST",
async: true,
url: "index.php?option=com_ajax&plugin=ajax&format=json",
dataType: "json",

Using Ajax to create session and echo results

I'm trying my best to get this to work. But AJAX is pretty new to me. So hang in there...
Ok, I've asked a couple of questions here about getting this issue that I'm having to work. I (We)'ve come a long way. But now the next issue is here.
I'm trying to echo a session in a div using AJAX.
The AJAX code is working, I can echo plain text to the div I want it to go. The only problem I have is it does not display the title of the item.
I have some items (lets say 3 for this example) and I would like to have the custom save the Items in a Session. So when the customer clicks on save. The ajax div displays the title. And if the custom clicks the 3rd item it show the 1st and 3rd item, etc...
My HTML:
<button type="submit" class="btn btn-primary text-right" data-toggle="modal" data-target=".post-<?php the_ID(); ?>" data-attribute="<?php the_title(); ?>" data-whatever="<?php the_title(); ?>">Sla deze boot op <span class="glyphicon glyphicon-heart" aria-hidden="true"></span></button>
My AJAX code:
$(".ajaxform").submit(function(event){
event.preventDefault();
$.ajax({
type: "POST",
url: "example.com/reload.php",
success: function(data) {
$(".txtHint").html(data);
},
error: function() {
alert('Not OKay');
}
});
return false;
});
My PHP reload.php:
<h4>Saved Items</h4>
<p>Blaat...</p>
<?php echo "Product Name = ". $_SESSION['item'];?>
I saw this code on here: I'm not using this code. Only wondering if I can use it for my code, and then how?
Change session.php to this:
<?php
session_start();
// store session data
$_SESSION['productName'] = $_POST['productName'];
//retrieve session data
echo "Product Name = ". $_SESSION['productName'];
?>
And in your HTML code:
function addCart(){
var brandName = $('iframe').contents().find('.section01a h2').text();
$.post("sessions.php", {"name": brandName}, function(results) {
$('#SOME-ELEMENT').html(results);
});
}
How I'm getting my title();:
<?php
// Set session variables
$_SESSION["item"][] = get_the_title();
?>
Is this some thing I can use? And could someone help me with the code?
Thanks in advance!

I'm not too sure on what exactly you're trying to accomplish, but here's a quick and dirty example of making an HTTP request (POST) with a name of a product, storing it in a PHP session, and outputting all product names in the session:
HTML
<p>Product A <button class="add-product" data-product="Product A">Add Product</button></p>
<p>Product B <button class="add-product" data-product="Product B">Add Product</button></p>
<p>Product C <button class="add-product" data-product="Product C">Add Product</button></p>
<div id="response">
</div>
JavaScript
$('.add-product').click(function() {
var productName = $(this).data('product');
$.post('addProduct.php', {productName: productName}, function(data) {
$('#response').html(data);
})
});
PHP (addProduct.php)
<?php
session_start();
if (!array_key_exists('products', $_SESSION) || !is_array($_SESSION['products'])) {
$_SESSION['products'] = [];
}
$productName = array_key_exists('productName', $_POST) ? (string) $_POST['productName'] : '';
if ($productName) {
$_SESSION['products'][] = $productName;
}
?>
<h4>Your added products:</h4>
<ul>
<?php foreach ($_SESSION['products'] as $product): ?>
<li><?php echo htmlspecialchars($product); ?></li>
<?php endforeach;?>
</ul>

AJAX GET simple PHP Multiple variables

I need a simple way to retrieve multiple PHP variables into html divs. I searched a lot of posts but I can't found an answer.
I am looking for something like this:
go-to-index.php
<?php
$name = 'Jonh';
$phone = '123456789';
$details = 'Detail about';
?>
index.php
<div class="name">Your Name is : <?php echo $name; ?></div>
<div class="phone">Your Phone Number is : <?php echo $phone; ?></div>
<div class="details">Your Details are : <?php echo $details; ?></div>
I want instead of echo to get them via AJAX Call.
What is the correct AJAX REQUEST syntax to do that?
UPDATE
My bad I do not noticed before but forgot to say I also need to load the calls one by one. I have too many requests and take a lot of time.
May the query .each() function should work like I want?

In your PHP:
<?php
echo json_encode(Array(
'name' => "John",
'phone' => "1234567890",
'details' => "Details about..."
));
Your HTML:
<div class="name">Your Name is : <span class="name_value"></span></div>
<div class="phone">Your Phone Number is : <span class="phone_value"></span></div>
<div class="details">Your Details are : <span class="details_value"></span></div>
Your jQuery:
$(document).ready(function(){
$.getJSON('user-info.php',function(data){
$(".name_value").html(data.name);
$(".phone_value").html(data.phone);
$(".details_value").html(data.details);
});
});
Note: you'll set the user-info.php string to the URL (relative or absolute) of your PHP script that grabs the user info.

You need a PHP script that will output JSON containing the values you want, and you need a Javascript handler to ask for that data and do something when it gets it. Here's an example:
# File: go-to-index.php
<?php
$name = 'Jonh';
$phone = '123456789';
$details = 'Detail about';
echo json_encode(
[
'name' => $name,
'phone' => $phone,
'details' => $details
]
);
Then your HTML page:
<!-- File: index.php -->
<div class="name">Your Name is : <span class="container"></span></div>
<div class="phone">Your Phone Number is : <span class="container"></span></div>
<div class="details">Your Details are : <span class="container"></span></div>
<button class="loadMe" type="button">Click here to make things work</button>
And finally your jQuery:
$(document).ready(function() {
$('.loadMe').click(function() {
$.ajax({
// Path to your backend handler script
url: 'go-to-index.php';
// Tell jQuery that you expect JSON response
dataType: 'json',
// Define what should happen once the data is received
success: function (result) {
$('.name .container').html(result.name);
$('.phone .container').html(result.phone);
$('.details .container').html(result.details);
},
// Handle errors in retrieving the data
error: function (result) {
alert('Your AJAX request didn\'t work. Debug time!');
}
});
});
});
You can do this on any event - the button was just an example. You can also use plain Javascript or any other library, just used jQuery since you tagged it in your question.