We Keep Coding

js event looping on dynamic content

i have this div in my homepage.php file:
<?php foreach($posts as $post): ?>
</div class="post>
<div class="options">
<div class="option"></div>
<div class="option"></div>
<div class="option"></div>
</div>
<div class="none editanddelete">
<button type="button" class="edit">edit</button>
<button type="button" class="delete">delete</button>
</div>
<div class="imageandname">
<img src="<?php echo $post->user_image ?>">
<div class="username"><?php echo $post->username ?></div>
</div>
<div class="post_body">
<?php echo $post->post_body ?><br>
</div>
</div>
<?php endforeach; ?>
the $posts is array that is coming from database through controller and each time i publish a post, the body will add new div like above with the data needed from the $post array, now as shown above, the child div with class "editanddelete" is hidden by giving class "none" which is display:none;
now with javascript i want to make an event where when i click on the child div with class="options", it toggles the "none" class of the child div with class="editanddelete", like the following:
post = document.querySelector('.post');
options = post.querySelector('.options');
editanddelete = options.querySelector('.editanddelete');
options.addEventListener('click', () => {
editanddelete.classList.toggle('none');
})
when i execute this code, it works fine on the first post (div) that is dynamically created, but when i add another post, the event will not work on the second post div, i tried to use querySelectorAll and loop "options" classes that will be created dynamically, but it just does not work as expected and the event affects other divs, what i want is to make the event for all divs, every div on it's own

You need to work with the same .editanddelete element as .options is clicked.
JS code could be like
var options = document.querySelector('.options');
// here maybe would be for cycle over options (I can't test it now)
options.addEventListener('click', () => {
this.parentNode.querySelector('.editanddelete').classList.toggle('none');
})

JS Display none with PHP foreach only working with first elemnt

I'm bringing articles from a database with ORDER BY RAND() with a PHP foreach cycle:
<?php foreach($posts as $post): ?>
<div class="post" id="post">
<article>
<div class="post-head">
<a href="<?php echo ROUTE; ?>/profile.php/<?php echo $post['user_id']; ?>">
<img class="post-pfp" src="<?php echo ROUTE; ?>/users_pics/<?php echo ($post['profile_pic']); ?>">
</a>
<h1>
<a class="links-3" href="<?php echo ROUTE; ?>/profile.php?user=<?php echo $post['user_id']; ?>"><?php echo $post['post_by']; ?></a>
</h1>
<p class="post-date"><?php echo get_date($post['date']); ?></p>
<div class="x_hover" onclick="hide_post()">
<img src="<?php echo ROUTE; ?>/icons/cross.svg">
</div>
<hr id="post-hr">
<br>
<a href="<?php echo ROUTE; ?>/post.php?p=<?php echo $post['ID']; ?>">
<p class="post-content"><?php echo $post['content']; ?></p>
</a>
</div>
</article>
</div>
<?php endforeach; ?>
As you can see, the div with the class x_hover has an onclick attribute:
<div class="x_hover" onclick="hide_post()">
<img src="<?php echo ROUTE; ?>/icons/cross.svg">
</div>
What the hide_post() function does is this:
var post = document.getElementsByClassName("post");
function hide_post(){
if (post[0].style.display = "block") {
post[0].style.display = "none"
}
}
I'm new to JS so I have some issues as well.
We are declaring that var post is equal to all the elements with the class name "post", such as the HTML code I added at the beginning, has the class post:
<div class="post" id="post">
This div has the display: block; attribute. However, when I run all this code, It only turns into display: none the first element that brings us from the database, it doesn't works with the rest of them...
Why is this happening?

IDs must be unique and since you have named all of the post only the first one will ever been "seen". Make the IDs unique, change your hide_post function to accept a ID name to hide, and add the unique ID to your onclick calls.
Change
<div class="post" id="post">
to something like
<div class="post" id="post<?php echo $post['ID']; ?>">
Then change
<div class="x_hover" onclick="hide_post()">
to
<div class="x_hover" onclick="hide_post('post<?php echo $post['ID']; ?>')">
Finally, modify your hide_post function to accept the name of the ID to show or hide.
function hide_post(idToHide){
if (idToHide.style.display = "block") {
idToHide.style.display = "none"
}
}

When you use getElementsByClassName it returns an HTMLCollection. You should iterate elements and hide all of them if it's what you intent to. Right now you are just hiding 0th element of this collection.
var posts = document.getElementsByClassName("post");
for (let post of posts) {
if (post.style.display = "block") {
post.style.display = "none"
}
}
If you intent to hide a single post you give unique ids to divs, and call hide_post with id of that post. Also you should use getElementById for that. Notice that it's not plural. Function should be like this:
function hide_post(postId){
var post = document.getElementById(postId);
if (post.style.display = "block") {
post.style.display = "none"
}
}

A more cleaner way of doing this would be.
function hide_post() {
document.querySelectorAll('.post').forEach(v => {
if(v.style.display == block) v.style.display = none; }); }

PHP read more read less - Magento 2

I made an read more read less script for my Magento 2 webshop. This is used on a category page where there are serval subcategorie blocks to choose, each subcategory has a description with.
The problem: if I click read more all the descriptions of the subcategories will expand in stead of only the description of the subcategory I clicked read moreI am starting to learn PHP and Magento 2 but I can't fix this, does someone know the solution?
<div class="product description product-item-description">
<div class="more">
<?php if ($_subCategory->getDescription()) {
$string = strip_tags($_subCategory->getDescription());
if (strlen($string) > 250) {
// truncate string
$stringCut = substr($string, 0, 250);
$string = substr($stringCut, 0, strrpos($stringCut, ' ')).'... Lees meer';
}
echo $string;
?>
</div>
<?php
}else {?>
<?php /* #escapeNotVerified */ echo $_attributeValue;
}
?>
</div>
<div class="less" style="display:none">
<?php echo $_subCategory->getDescription(); ?>
Lees minder
</div>
<script type="text/javascript">
console.log('test');
require(["jquery"],function($){
$('.readmore').on("click",function(){
$('.less').show();
$('.more').hide();
});
$('.readless').on("click",function(){
$('.less').hide();
$('.more').show();
});
});
</script>
</div>

This is because, when you type $('.less').hide(); this is grabbing every element with the attribute class='less'. This is the way I would overcome this:
Start by attaching a unique attribute to each <div class="more"> or <div class="less"> - in this case, we use the class attribute: (and move 'more' or 'less' to an id)
<div id="read-more-block" class="cat-<?php echo $_subCategory->getId(); ?>">
<!-- my "read more" content -->
<a class="link" href="#read-more-block">Read Less</a>
</div>
<div id="read-less-block" class="cat-<?php echo $_subCategory->getId(); ?>">
<!-- my "read less" content -->
<a class="link" href="#read-less-block">Read More</a>
</div>
We now have a read-more-block and a read-less-block for each subcategory. When we click the inside link a jQuery event should fire which will hide itself and display the other.
And then, in your jQuery:
$('#read-more-block .link').on('click', function() {
var $readLessBlock = $('#read-less-block.' + $(this).parent().attr('class'));
$readLessBlock.show(); //Show the read less block
$(this).parent().hide(); //Hide the read more block
});
..and vice versa for read less.

Wordpress: Turn off display of posts until filter button is clicked

(This is an extension of a series of questions I have asked previously as I'm going through the process of learning how to work with Wordpress)
I'm using a small javascript to turn on and off the display of posts on a page, depending on the posts respective category. The script enables a group of filter buttons at the top of the page to switch between displaying posts that belong to a certain category.
Now I would like to change the page's code so that upon loading the page for the first time (i.e. before any of the filter buttons have been clicked) there is no content/posts being displayed at all. Right now when accessing the page, all posts which belong to the parent category of the sub-categories (which the buttons allow to filter) are being displayed.
How do I have to change the site to do so?
An online version of the site can be visited here: http://udkdev.skopec.de/category/studierende/
Here's the site's code along with the javascript of the filter-button at the bottom:
<?php get_header(); ?>
</div>
<br>
<div class="wrapper-offset-fix wrapper-studierende">
<div class="projekte content">
<div class="button-group filters-button-group">
<button class="projekt-btn btn" id="category-stud-sose17">SoSe 2017</button>
<button class="projekt-btn btn" id="category-stud-wise1617">WiSe 2016/17</button>
<button class="projekt-btn btn" id="category-wise-201415">SoSe 2016 </button>
<button class="projekt-btn btn" id="category-sose-14">WiSe 2015/16</button>
<button class="projekt-btn btn" id="category-sose-14">SoSe 2015 </button>
<button class="projekt-btn btn" id="category-sose-14">WiSe 2014/15</button>
</div>
<?php if (have_posts()): ?>
<?php while(have_posts()): the_post(); ?>
<div <?php post_class(); ?>>
<?php
if ( has_post_thumbnail() ) {
the_post_thumbnail('full');
} ?>
<?php the_content(); ?>
</a>
<!--<div class="meta">Tags: <?php the_tags( '', ', ', '<br />' ); ?> </div>-->
</div>
<?php endwhile; ?>
<?php else : ?>
<h2>Couldn’t find any articles!</h2>
<?php endif; ?>
</div>
<script>
var $btns = $('.btn').click(function() {
if (this.id == 'all') {
$('.projekte > .post').fadeIn(300);
} else {
var $el = $('.' + this.id).fadeIn(300);
$('.projekte > .post').not($el).fadeOut(300);
}
$btns.removeClass('active');
$(this).addClass('active');
})
</script>
<?php get_footer(); ?>

You can begin this by first hiding all the posts. One way to do this would be add a CSS style
.projekte .post {display:none;}
Looking at your codes, rest should just work out by itself. I would however swap these lines so that the posts are removed before the new ones are added like this:
$('.projekte > .post').not($el).fadeOut(300);
var $el = $('.' + this.id).fadeIn(300);

Refresh to show new/random taxonomy

I have an area on my Wordpress theme where I am showing info about a random taxonomy. Basically, the taxonomy is "playwrights" and I am featuring a random one on the home page. Here is the HTML:
<div id="home-top-right">
<?php
$allpw = get_terms( 'playwrights', 'hide_empty=0' );
$randpw = $allpw[ array_rand( $allpw ) ];
$randpw = get_term($randpw->term_id, 'playwrights');
$pwlink = get_term_link($randpw->term_id, 'playwrights');
?>
<div class="title">
Playwright Spotlight
<li class="fa fa-refresh refresh"></li>
</div>
<div class="content" id="p-spotlight">
<?php if (get_field('image', 'playwrights_'.$randpw->term_id)) { ?>
<div class="thumb">
<?php $imageid = get_field('image', 'playwrights_'.$randpw->term_id); ?>
<a href="<?php echo $pwlink; ?>">
<?php echo wp_get_attachment_image($imageid, 'pwthumb'); ?>
</a>
</div>
<?php } ?>
<div class="text">
<div class="sub-title">
<?php echo $randpw->name; ?>
</div>
<?php echo print_excerpt('', '200'); ?>
</div>
</div>
</div>
I want to be able to click a button (in the code, it is the <i> tag) and reload just that section (not the whole page) with a new random taxonomy term (playwright). I'm not great at JS/jquery and I'm not able to find a tutorial online that gets me where I need to go, especially considering the exchange between post data and the js function.
How should I go about this?

By default, WordPress has an admin-ajax.php file which you can send AJAX calls to. You can create a hook that is linked to your own custom function in which you can do the stuff you want, like getting the random term and send it back to the client.
Then you can pass a value to your AJAX call, called 'action'. When admin-ajax.php is getting a POST request with the action you 'hooked', your custom function is being executed.
Have a look at the links below for a more detailed explanation:
http://premium.wpmudev.org/blog/how-to-use-ajax-with-php-on-your-wp-site-without-a-plugin/
http://codex.wordpress.org/AJAX_in_Plugins