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Pass PHP variable from one page to another to get correct item from button [duplicate]

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PHP Pass variable to next page
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I have 2 pages, content.php & pagecontent.php, and in content.php I display products info from database into table tags and inside has a grid of 2 rows and 3 columns that I echo descriptions of the products into. One of the grids row holds a button with and thumbnail image over it so that it would link or send user to pagecontent.php for that specific product info page. On pagecontent.php the user will be able to add the product/s to a cart/wishlist(not there yet, future stuff).
Ok so far on content.php I've been able to display all products from database, from the query and while loop, works, I was able to change stuff in database and changes would happen on content.php. I've had no success on passing a variable or id with $_GET, and I believe that's what I would want to use for this case. Also don't think my ajax is correct or it's missing things. I was trying to figure out how the button would get the products PartsID (1,2,3,etc...) from database, PartsID is the column name, to later be called when clicked then pass it to pagecontent.php to get correct product info from button. If there's a better way then the way I have the being used then let me know.
content.php
<?php
$stmt = $pdo->query("SELECT * FROM Parts");
while ($product = $stmt->fetch(PDO::FETCH_ASSOC)) {
?>
<td>
<?php
echo '<button type="button" class="testButton" onclick="test()">
<img src="images/APA802AC.jpg">
</button>';
?>
</td>
<td class="td-manufacturer">
<h6>MANUFACTURER</h6>
<p>
<?php
echo $product["Manufacturer"];
?>
</p>
</td>
<script type="text/javascript">
function test(itemid) {
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200)
{
window.location.assign("pageContent.php").innerHTML = xhr.responseText;
}
}
xhr.open("GET", "pageContent.php?id=" + itemid, true);
xhr.send();
}
</script>
pagecontent.php
This page has tables as well but no grids. I need to get previous page button clicked PartsID(1,2,3,etc...) here and display that products info where I echo $row.
<div class="productInfo">
<h2 class="productTitle">
<?php
echo $row["PartTitle"];
?>
</h2>
</div>
<td>
<?php
echo $row["Availability"];
?>
</td>
<td>
<?php
echo $row["Price"]
?>
</td>
I would really hope for some detailed help please. I've tried all sorts of different variations of code and research, learning as I go with little time I have, new to php and javascript/ajax so go easy on me please. I hope I was clear and makes sense. Thanks!

First of all, your line
window.location.assign("pageContent.php").innerHTML = xhr.responseText;
is not doing what you think it is doing. "location.assign" loads a different page. Haven't tried myself to see if that will through an error to console for the innerHTML dereferencing, but you should check the network tab in your browser, most probably you will see 2 calls to pageContent: one with parameter (your ajax call) and 2nd one without (your location.assign call).
Secondly, if you have a multipage php application, you probably dont need ajax, as the page content is generated on the server side and after that it becomes static. Ajax is more suited for a single page applications with dynamic content.
w/o changing your application code too much, try to remove the ajax call and use only window location:
<script type="text/javascript">
function test(itemid) {
window.location.assign(_your_base_url_ + "pageContent.php?id=" + itemid)
}
</script>
I believe that would allow you to see the parameter on the server side in $_GET query.
P.S. I havn't been doing php lately so the above answer is more or less a concept. You may have to check php documentation for how to access the parameters. And reading some tutorials on this subject is not such a bad idea, as it seems that you do have some gaps in understanding the overall concept of doing web applications with php.

Including a PHP from another server using JS

I am attempting to build a very simple advertising system which is included on all of my websites and is called using a variable above the script to determine what kind of advert is displayed.
For this system, I have been using basic include functions. For example, on a clients website, near the footer, I would have:
$ad_type = 'banner';
include = '../../adsystem/adsystem.php';
The code for this adsystem.php is:
///// BANNER AD //////
if($ad_type == 'banner'){
$today = date("Y-m-d");
$sql = "SELECT * FROM `ad_adverts` WHERE `ad_start_date` <= '$today' AND `ad_end_date` >= '$today' AND `ad_type` = 'banner' ORDER BY RAND() LIMIT 1";
$result = $ad_conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
$ad_id = $row["ad_id"];
$ad_link = $row["ad_link"];
$ad_direc = $row["ad_direc"];
?>
<div align="center">
<a target="_blank" href="http://mysite.co.uk/adsystem/adsystem.php?redirect=<? echo $ad_link; ?>&adid=<? echo $ad_id; ?>"><img src="<? echo $ad_direc; ?>" alt="<? echo $ad_link; ?>" style="width:70%; height:70px;"></a>
</div>
<?
}
}
$ad_type = '';
}
/////////////////////
VERY BASIC AT THE MOMENT - IS NOT YET COMPLETE. Simply using this as a test to get it working, then I will deal with fixing security problems and SQL injection, etc...
This will then display the adsystem.php code at the bottom of the site, or wherever I decide to add it. And this works perfectly for local websites - although I am working with websites which are not on the same server, and as you can imagine, that's where I run in to problems due to security issues.
Google Adsense and other advertising agencies combat this issue by using JS code to call the adverts, although I'm not skilled enough with JS to do this. On that direction though, I am wondering if it might be possible to use JS to just call the PHP script or if that would even work?
If anybody could point me in the right place here that would be great?

Without JS you are not able to do it. Please check document.write method. Here you have an example how to add dynamically your JS file with ads into html document:
<script>
var url = 'http://ads.com/buyme?rand='+Math.random()
document.write('<script src="'+url+'"></scr'+'ipt>')
</script>
Under this url, you should generate piece of JavaScript code dynamically in PHP, which should contains content of advertising and write in into html document using document.write method again.

You could use AJAX to call asynchronously to that script. In your php return a JSON with available advertisements.
Also you should consider using template engine and/or PHP framework. Mixing views with business logic isn't great idea.

Where to declare javascript/jQuery scripts

I'm trying to do some stuff with jquery/js (I don't know which one it is..), for example this script ; http://pastebin.com/V3HpU0NY - > http://blog.mainstreethost.com/light-youtube-embeds-faster-page-load#.VG9HKamkVSJ
But now comes the difficult part.
Url: http://erwin.my89.nl/stage/sieh/
This is the website when you go to the url.
This loads the "gallery (top)" and all content/ and kinda images(lazyload) for all the 'gallery' posts. If this has to be done another way please say so.
When you click a image you'll get this:
I hope you understand the idea.
So everything working ok
but now i go in to the inspector and i encounter this?!
I assume it is because i have the script defined in the loop of the content.. so when i click a gallery image, it loads another bunch of those text/css's.
So my question is: Is this the right way to do it? or should i be doing this different?
while ($loop->have_posts()) : $loop->the_post($post->ID);
if ($metas) {
foreach ($metas as $metakey) {
} elseif ($metakey['url']) {
preg_match(
'/[\\?\\&]v=([^\\?\\&]+)/',
$metakey['url'],
$matches
);
$id = $matches[1];
?>
<div class="youtube" id="<?php echo $id ?>" style="width: 560px; height: 315px;"></div>
<script type="text/javascript" src="<?php bloginfo('template_url'); ?>/js/youtube.js"></script>
<?php
^part of the code, if need more please say so.
Thanks in advance!

Can you put your CSS file/s in the head? That's where it normally goes.
Also, I don't see anywhere in your PHP where it could be loading these <style></style> tags. However it does look like it's going to import the same script at the end of each loop.
Could you provide more information on what your exact problem is?

How can I put PHP code inside JavaScript document.write

Hello can anyone please help me in fixing this code?
1st code
<script type="text/javascript">
if (document.getElementById("tester") != undefined)
{
document.write('**2nd code should be here**');
}
else
{
document.write('<img scr="./img.png" />');
}
</script>
2nd code
<?php while (have_posts()) : the_post(); get_template_part('item-video');
endwhile; ?>
What I want to happen is to insert the 2nd code into the first code. But when I try to insert it, it gives me a blank page.

the biggest thing I've heard is that PHP is server side, while Javascript is client side. Therefore, changing the html page using document.write() isn't going to do anything unless you reload the page. I think you can circumvent this problem tho, using Ajax and the load() function.

How do I use php functions in javascript?

Situation:
I'm building a Wordpress Site. Menu becomes 'fixed' to the top of the page when scrolling down the page (http://deerfielddesigns.com.mlseo.net/). When i am logged into wordpress, the dashboard admin bar cover the menu. I wanted to create a different class for the menu when I am logged in as opposed to when I am logged out.
Code:
if ( direction === 'down' ) {
$('#main-header').addClass( 'et-fixed-header' );
} else {
$('#main-header').removeClass( 'et-fixed-header' );
}
I wanted to insert an "if ( is_user_logged_in() )" statement in there to change the class output but I don't really understand too much about javascript and if it plays nice with php. Does anyone have any insight as to what i need to do to make this work? Thanks all!

if this is not an AJAX driven login system, simply open your header.php file and perform the following
$the_class = is_user_logged_in() ? 'logged-in-class' : 'logged-out-class';
Then find your main-header and do what's required.
<header id="main-header" class="<?php echo $the_class;">
If it is an ajax driven login system, you'll need to understand how to work with wordpress' add_action, but that is an answer for an entirely different question.

Make an ajax request to the required php function whenever required. You may use ajax features of various JS libraries like jQuery, YUI etc. to do so.

PHP is a server side language (which quite likely is generating Javascript).
Javascript is in the browser.
The short answer is "You can't easily call PHP from JS".

The simple way to identify from you javascript if a user is logged in is to populate a javascript variable with their status. In your theme's header.php, add:
<script type="text/javascript">
var is_logged_in = <?php echo json_encode(is_user_logged_in()) ?>;
</script>
Then, in your javascript elsewhere, you can use:
if (is_logged_in) {
//....
}

If you write inline javascript in your php files you can do this:
<?php // some php code ?>
<script type="text/javascript">
<?php if ( is_user_logged_in() ) { ?>
// Place some javascript here
<?php } else { ?>
// Place some javascript here
<?php ?>
</script>
<?php // some php code ?>