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Stop playing iframe video after closing modal window

I need stop video from playing after closing modal window. This is my code:
<div onclick="document.getElementById('id01').style.display='block'" class="mkdf-elements-holder-item-content mkdf-elements-holder-custom-184744" style="padding: 300px 0 200px 0">
<div id="id01" class="w3-modal">
<div class="w3-modal-content w3-card-4">
<header style="background-color:white;" class="w3-container w3-teal">
<span onclick="document.getElementById('id01').style.visibility='hidden'"
class="w3-button w3-display-topright">×</span>
<h2 style="background-color:white; color: white"> V </h2>
</header>
<div class="w3-container">
<iframe id="ifr" src="https://www.youtube.com/embed/ZrXbX8cWrvQ" allowscriptaccess="always"> /iframe>
</div>
</div>
</div>
I have tried this code, but it does not work:
<script>
$("#id01").on('hidden.bs.modal', function (e) {
$("#id03 iframe").attr("src", $("#id03 iframe").attr("src"));
});
</script>
Anyone know how I can achieve to stop playing video when I close modal window?

How should jQuery reference and id that is not present in your HTML? #id03 is not existing as pointed out by #Manjuboyz, use #ifr instead for referencing your iframe.
<script>
$("#id01").on('hidden.bs.modal', function (e) {
$("#ifr").attr("src", $("#ifr").attr("src"));
});
</script>
Your approach would require a reload of the entire video. If you have an iframe that contains a <video></video> element, you can just stop it and set it to the beginning:
$('#ifr').contents().find('video').each(function () {
this.currentTime = 0; // set to beginning
this.pause(); // set video to paused
});
You need to use jQuery's contents() to work on the DOM of the iframe.

Jquery - Open .next

I am trying to create a script that only opens the next div called .video-overlay.
I do not want to use ID's as there could be up to 30 videos per page.
JS Fiddle: https://jsfiddle.net/w2fqrzbw/
At the moment the script is affecting both... is there a way of targetting the next div named .video-overlay?
HTML:
<span class="video-trigger">Button 1 </span>
<!-- Close video trigger-->
<div class="video-overlay">
<div class="overlay-close">Close</div>
<div class="container">
Popup 1
</div>
</div>
<!-- Close video popup-->
<br><br/>
<br><br/>
<br><br/>
<span class="video-trigger">Button 2</span>
<!-- Close video trigger-->
<div class="video-overlay">
<div class="overlay-close">Close</div>
<div class="container">
Popup 2
</div>
</div>
<!-- Close video popup-->
JS:
//Video popup
$(document).ready(function() {
$('.video-trigger').click(function() {
$('.video-overlay').fadeIn(300);
$('.video-overlay video').get(0).play();
});
$('.video-overlay .overlay-close').click(function() {
$('.video-overlay').fadeOut(300);
$('.video-overlay video').get(0).pause();
});
});
This is how it is laid out in my actual web document:
<div class="col span_6_of_12 ripple-me">
<div class="video-thumbnail" style="background-image: url(<?php echo $video_thumbnail; ?>);">
<span class="video-trigger">
</span>
</div>
<!--Close Video box cta -->
<div class="video-overlay">
<div class="overlay-close">Close</div>
<div class="container">
<iframe allowFullScreen='allowFullScreen' src="<?php echo $video_link; ?>" width="960" height="370" allowtransparency="true" style='position:absolute;top:0;left:0;width:100%;height:100%;' frameborder="0"></iframe>
</div>
</div>
<!-- Close video popup-->
</div>

The issue with your current logic is that it's affecting all .video-overlay elements on click. To fix this you can use DOM traversal to find only the one related to the clicked .video-trigger using next() and closest(). Try this:
$(document).ready(function() {
$('.video-trigger').click(function() {
$(this).next('.video-overlay').fadeIn(300).find('video').get(0).play();
});
$('.video-overlay .overlay-close').click(function() {
$(this).closest('.video-overlay').fadeOut(300).find('video').get(0).pause();
});
});

Try using JQuery Next Function :
//Video popup
$(document).ready(function() {
$('.video-trigger').click(function() {
var $videoOverlay = $(this).next('.video-overlay');
videoOverlay.fadeIn(300);
videoOverlay.find('video').get(0).play();
});
});

jQuery provides powerful DOM traversal tools. Be sure to use them
//Video popup
$(document).ready(function() {
$('.video-trigger').click(function() {
$(this).parent().next('.video-overlay').fadeIn(300);
$('.video-overlay video').get(0).play();
});
$('.video-overlay .overlay-close').click(function() {
$(this).parent().fadeOut(300);
$('.video-overlay video').get(0).pause();
});
});

Wordpress Injected youtube videos, play on modal open, pause on modal close

I have youtube videos being injected dynamically with wordpress into multiple modals.
<div class="modal-overlay features-modal" id="modal-<?php echo $do; ?>">
<div class="modal-bg">
<div class="modal-close"></div>
<div class="modal">
<div class="videoWrapper">
<iframe class="youtube-video" src="<?php the_sub_field('youtube_video') ?>?rel=0&controls=0&showinfo=0" frameborder="0" allowfullscreen allowscriptaccess="always"></iframe>
</div>
</div>
</div>
</div>
What I am trying to accomplish is to get each individual youtube video to play on modal open and pause on modal close. Right now I can get the video to pause on close, but when I try to implement play on open with autoplay=1, it plays again on close (this code does not reflect the play on click).
function modalFadeOut() {
$('.open-modal').fadeOut("fast").removeClass("open-modal");
$('html').css('overflow','');
};
// features scroll video modal
$(".video-button").click(function() {
var Modal = $(this).data("modal-type");
$("#"+Modal).fadeIn("fast").addClass("open-modal");
});
$('.modal-bg').click(function() {
modalFadeOut();
var vid = $(this).find('iframe[src*="youtube"]');
if ( vid.length > 0 ) {
var src = vid.attr('src');
vid.attr('src', '');
vid.attr('src', src);
}
});

jquery slidetoggle hide previous element

I'm working on a slideToggle function on click, I want to hide the previous element that was clicked when a new one is clicked, I've used this same set of code previously and its worked however it's no longer working now and I'm stumped at why its no longer works:
My code is as below or view a jsfiddle
js/js.js
$('.togglesources').hide();
$('.captionsource').on('click', function () {
$(this).next('.togglesources').slideToggle();
$(this).parent().siblings().children().next().slideUp();
return false;
});
index.html
<div class="mostpopular">
<h4>Nokia:</h4>
<h5>3100</h5>
<p>Most popular mobile phone of the year</p>
<div class="sources">
<p class="captionsource">Click to toggle source</p>
<div class="togglesources">
<p class="source">Wikipedia (Data Source)</p>
<p class="source">GSM Solution (Image Source)</p>
</div><!-- End Toggle Sources -->
</div><!-- End Sources -->
</div>
<!-- END MOST POP -->
<div class="mostpopular">
<h4>Lord of the Rings:</h4>
<h5>Return of the King</h5>
<p>Highest Grossing Film</p>
<div class="sources">
<p class="captionsource">Click to toggle source</p>
<div class="togglesources">
<p class="source">Wikipedia</p>
<p class="source">IMDB (Image Source)</p>
</div> <!-- End Toggle Sources -->
</div> <!-- End Sources -->
</div>
would appreciate some help in regards to this.
Why aren't the other '.togglesources' divs closing when I open a new one?

Try this:
$('.togglesources').hide();
$('.captionsource').on('click', function () {
$(this).closest('.mostpopular').siblings().find('.togglesources').slideUp();
$(this).next('.togglesources').slideToggle();
$(this).parent().siblings().children().next().slideUp();
return false;
});
Working Fiddle

.slideToggle() is being triggered many times?

I'm trying to create a Tumblr theme in which the links and post information slide in when you click a + sign. (My test blog is at http://noitsnotitsnotokay.tumblr.com/)
I'm quite the begginner at JavaScript, but I was able to work it out for a links menu with the following code:
<span class="btn">+</span>
<ul class="lks">
<!-- various links are here -->
</ul>
<script>
$("ul.lks").hide();
$("span.btn").click(function () {
$("ul.lks").slideToggle("slow");
});
</script>
But I also have a piece of code that applies to all posts, for the post information. I used nearly the same code, but, as you can probably see, it slides in and out various times.
<div class="pstinfo">
<!-- info is here -->
</div>
<span class="plsign">+</span>
<script>
$("div.pstinfo").hide();
$("span.plsign").click(function () {
$("div.pstinfo").slideToggle("slow");
});
</script>
It seems that the button's order and the way I name the classes in the JavaScript isn't changing much...any tips?

If you you don't want to open all the '.pstinfo' elements when you click on '.plsign', just the related one, try this code:
HTML:
<div class='parentContainer'> <!--put your elements in a parent Container -->
<div class='info'>
Info 1
</div>
<div class='plsign'>
+ Open
</div>
</div>
<div class='parentContainer'>
<div class='info'>
Info 2
</div>
<div class='plsign'>
+ Open
</div>
</div>
<div class='parentContainer'>
<div class='info'>
Info 3
</div>
<div class='plsign'>
+ Open
</div>
</div>
JS:
$(".plsign").on('click',function ()
{
$(this).parent().find('.info').slideToggle("slow");
});
Link to jsFiddle

code block 01
<span class="btn">+</span>
<ul class="lks">
<!-- various links are here -->
</ul>
<script>
$("ul.lks").hide();
$("span.btn").click(function () {
$("ul.lks").stop().slideToggle("slow");
});
</script>
Code block 02
<div class="pstinfo">
<!-- info is here -->
</div>
<span class="plsign">+</span>
<script>
$("div.pstinfo").hide();
$("span.plsign").click(function () {
$("div.pstinfo").stop().slideToggle("slow");
});
</script>
Try this code and Update the result :)