Develop Reference

Uncaught TypeError: document.getElementById(...).contentWindow is undefined

Here's the html:
<div id="vid">
<iframe src="https://yewtu.be/embed/jfKfPfyJRdk" height="0px" width="0px" frameborder="0"></iframe>
</div>
And here's the javascript:
function volume() {
document.getElementById("vid").contentWindow.getElementById("player_html5_api").volume = 0.2;
}

You're trying to select the container div, not the iframe itself. Try using querySelector('#vid > iframe').
function volume() {
const iframe = document.querySelector('#vid > iframe')
if(iframe) {
iframe.contentWindow.getElementById("player_html5_api").volume = 0.2;
}
}
volume()
<div id="vid">
<iframe src="https://yewtu.be/embed/jfKfPfyJRdk" height="0px" width="0px" frameborder="0"></iframe>
</div>

Why does my slider go blank after reaching the end?

I'm having a two issues/problems with the following slide.
It is a "double slider", so, two simultaneous slider in body section.
First is that when i reach the last image (9-nth, cos that much both sliders contain), the second slider continues to work properly (sliding images infinitely) but the first one just get blank.
Or if i click on previous button on begining then second doesn't work and images disapear, while the first one work nicely. Can't figure it out why. I've tried changing the "id" in the HTML and styling it but nothing change.
Second is, that i finally need to make it more dynamic, so, to avoid hardcoding images in the HTML and to putt them in JS and somehow append them in the DOM, but don't know what exactlly to do; creating an array, or using the "createElement"?
And which logic could be usable to actually include them in the DOM and have the following slider(s), considering the provided code?
Since it's my just second slider which i'm making, i found it pretty much hard, so any help/hint/advice is welcomed.
P.S Must be in jQuery and plugins excluded, so please don't provide any plugins links.
Thank you in advance.
var slides = $('.slide');
slides.first().before(slides.last());
$('button').on('click', function() {
// Selecting the slides
slides = $('.slide');
// Selecting button
var button = $(this);
// Register active slide
var activeSlide = $('.active');
// Next function
if (button.attr('id') == 'next') {
slides.last().after(slides.first());
activeSlide.removeClass('active').next('.slide').addClass('active');
}
// Previous function
if (button.attr('id') == 'previous') {
slides.first().before(slides.last());
activeSlide.removeClass('active').prev('.slide').addClass('active');
}
});
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
.slider {
position: relative;
width: 100%;
height: 300px;
overflow: hidden;
}
.slide {
width: 100%;
height: 300px;
position: absolute;
transition: 0.6s ease;
transform: translate(-100%, 0);
}
.slide img {
width: 100%;
height: 300px;
}
.slide.active {
transform: translate(0, 0);
}
.slide.active~.slide {
transform: translate(100%, 0);
}
body {
text-align: center;
}
button {
margin-top: 20px;
border: none;
border-radius: 0;
background: aqua;
color: #333;
padding: 10px;
cursor: pointer;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="slider">
<div class="slide active">
<img src="Assets/slider-image-1.jpg" alt="">
</div>
<div class="slide">
<img src="Assets/slider-image-2.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-3.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-4.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-5.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-6.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-7.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-8.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-9.jpg">
</div>
</div>
<div class="slider">
<div class="slide active">
<img src="Assets/slider-image-1.jpg" alt="">
</div>
<div class="slide">
<img src="Assets/slider-image-2.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-3.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-4.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-5.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-6.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-7.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-8.jpg">
</div>
<div class="slide">
<img src="Assets/slider-image-9.jpg">
</div>
</div>
<button id="previous"><img src="Assets/arrow-blue-left.png" alt=""></button>
<button id="next"><img src="Assets/arrow-blue-right.png" alt=""></button>

Your code doesn't work properly because the slides = $('.slide') variable contains all slides from both sliders. You have to manipulate the slides in the to sliders independently. The second failure is that in your example the first slide is the initial active slide. Only slides in range second -> penultimate are allowed. Working example here
function handleSlide(slider, direction) {
var slides = $(slider).find('.slide');
if(slides.length < 1) return;
// Register active slide
var activeSlide = $(slider).find('.active');
// Next function
if (direction == 'next') {
slides.last().after(slides.first());
activeSlide.removeClass('active').next('.slide').addClass('active');
}
// Previous function
if (direction == 'previous') {
slides.first().before(slides.last());
activeSlide.removeClass('active').prev('.slide').addClass('active');
}
}
$('button').on('click', function() {
var button = $(this);
handleSlide($("#slider1"), $(button).attr('id'));
handleSlide($("#slider2"), $(button).attr('id'));
});

Loading images dinamically: You can do that by defining an array which contains the images and you can append the images into the slider using the jQuery 'append' method. Working example on jsFiddle.
function fillSliders(slider, images) {
$(slider).empty();
for(var i = 0; i < images.length; i++) {
if(typeof images[i] == "string" && images[i] !== "") {
var active = (i == 1) ? " active" : "";
$(slider).append('<div class="slide'+active+'"><img src="'+images[i]+'"
alt="image-'+i+'" /></div>');
}
}
}
var images = ["image1.jpg", "image2.jpg","image3.jpg","image4.jpg"];
fillSliders($("#slider"), images);

Change video of video tag on scroll

I have a video tag say
<div class="phone" align="center">
<div class="phone-inner">
<video width="100%" height="100%" autoplay="" loop="" muted id="phonevideo">
<source src="vid/1.mp4" type="video/mp4">
</video>
</div>
</div>
I want to change the video when page scrolls and each time div changes like fueled.com. Say I have six divisions like
<div id="first></div>
<div id="two"></div>
<div id="three"></div>
<div id="four"></div>
<div id="five"></div>
<div id="six"></div>
When div 2 comes into view the video should change and when div 3 or 4 comes into view video should change again to something else. Here is my code which needs to be modified according to it.
$(window).scroll(function() {
var topDivHeight = $("#first").height();
var DivTop = $("#sixth").position().top;
var viewPortSize = $(window).height();
var triggerAt = 450;
var triggerHeight = (topDivHeight - viewPortSize) + triggerAt;
var test1 = (topDivHeight - viewPortSize) + 650;
var count = 0;
var number = jQuery.grep(mainTops, function(n, i) {
if (n < $(window).scrollTop())
{
count++;
}
});
$('.nav ul li a').css("color", "#fff");
$('.nav ul li a#nav'+count ).css("color", "#f60");
if($(window).scrollTop() >= triggerHeight && $(window).scrollTop() < DivTop) {
$('.phone').css('visibility', 'visible').fadeIn();
if($(window).scrollTop() >= test1){
$('#phonevideo').html('<source src="vid/2.mp4" type="video/mp4">'); // tried using this method but its not working here. Some other method needed here.
}
} else {
$('.phone').fadeOut();
}
});

Try this code:
$('#phonevideo').find("source").attr("src", "https://www.w3schools.com/tags/movie.mp4");
$('#phonevideo').get(0).load();
You can change source attribute like $('#phonevideo').find("source").attr("src","videosource")
and after changing source you need to load video $('#phonevideo').get(0).load()

You cannot directly replace the HTML as you do using function .html(), accordingly to the HTML specification
Dynamically modifying a source element and its attribute when the
element is already inserted in a video or audio element will have no
effect.
But what you can try as suggested by the document is to change what is playing, just use the src attribute on the media element directly and use function .load();
A working example below:
var btn = document.getElementById('btn'),
player = document.getElementById('phonevideo'),
source = document.getElementById('src');
btn.addEventListener('click', function(event) {
player.pause();
source.src = 'http://html5demos.com/assets/dizzy.mp4'; // change video
player.load(); // load it
});
<div class="phone" align="center">
<div class="phone-inner">
<video width="100%" height="100%" autoplay="" loop="" muted id="phonevideo">
<source id="src" src="http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4" type="video/mp4">
</video>
</div>
</div>
<button id="btn" type="button">Change Video!</button>
Using jQuery as on your example (not tested):
var player = $('#phonevideo');
player.find("source").attr("src", "http://html5demos.com/assets/dizzy.mp4");
player[0].load();

I've optimized your code. I have added a class to your divs and used the data attribute. Here is a working jsfiddle.
<div class="phone" align="center">
<div class="phone-inner">
<video width="100%" height="100%" autoplay="" loop="" muted id="phonevideo">
<source src="vid/1.mp4" type="video/mp4">
</video>
</div>
</div>
<div id="first" class="view" data-vid-src="vid/1.mp4"></div>
<div id="two" class="view" data-vid-src="vid/2.mp4"></div>
<div id="three" class="view" data-vid-src="vid/3.mp4"></div>
<div id="four" class="view" data-vid-src="vid/4.mp4"></div>
<div id="five" class="view" data-vid-src="vid/5.mp4"></div>
<div id="six" class="view" data-vid-src="vid/6.mp4"></div>
To see some result I have added some css:
.phone {
position: fixed;
height: 200px;
width: 120px;
background: white;
top: 50%;
left: 50%;
margin-top: -100px;
margin-left: -60px;
}
.view {
height: 500px;
}
#first {
background: red;
}
#two {
background: yellow;
}
#three {
background: green;
}
#four {
background: blue;
}
#five {
background: pink;
}
#six {
background: black;
}
And now the jQuery part.
function getCurrentElement(pos) {
var len = $('.view').length;
var i = 0;
var old_pos;
var ele_pos;
var old_ele;
var return_ele;
$('.view').each(function(){
i++;
offset = $(this).offset();
ele_pos = offset.top;
if(pos == ele_pos) {
return_ele = $(this);
return;
}
else if(ele_pos > pos && old_pos < pos) {
return_ele = old_ele;
return;
}
else if(ele_pos < pos && i == len) {
return_ele = $(this);
return;
}
old_pos = ele_pos;
old_ele = $(this);
});
return return_ele;
}
var old_ele = null;
$(window).scroll(function() {
var cur_pos = $(window).scrollTop();
current_element = getCurrentElement(cur_pos);
if(old_ele != null) {
if(current_element.attr('id') != old_ele.attr('id')) {
$('#phonevideo source').attr('src',current_element.attr('data-vid-src'))
}
}
old_ele = current_element;
});
I hope this code will help you. :)

Iframe click with javascript doesn't work

I have this javascript code:
function start1(dis,www){
var visina = screen.availHeight;
var content = '<div id="showRtbn" style="position: fixed;text-align:center;left: 0px;width: 225px;height: 80px;top: 50%;z-index: 9999999;background: #E81515;cursor: pointer; border-radius:5px; margin-left:-15px;"> <iframe src="https://domain.com/hotel/2" style="border:0px #FFFFFF none;" name="myiFrame1" scrolling="no" frameborder="0" marginheight="0px" marginwidth="0px" height="100%" width="100%"></iframe></div> <div id="rtb" style="width:100%; height:100%; opacity:0; position:fixed; box-sizing: border-box; left:0px; top:0px; z-index:99999999; display:none; background:rgba(0, 0, 0, 0.8)"><iframe src="'+www+'" style="border:0px #FFFFFF none;" name="myiFrame" scrolling="yes" frameborder="0" marginheight="0px" marginwidth="0px" height="100%" width="100%"></iframe><div id="hideRtb" style="background:#fff; cursor:pointer; top:15px; right:15px; z-index:9999999; position:fixed; border-radius:25px;"><img style="width:50px; height50px;" src="http://i.imgur.com/QqlcQwu.png"></div></div>';
var newNode = document.createElement("DIV");
newNode.innerHTML = content;
document.body.appendChild(newNode);
var rtb = document.getElementById("rtb"),
timer = null;
document.getElementById("showRtb").addEventListener("click", function() {
if (rtb.style.opacity != 1) {
clearTimeout(timer);
rtb.style.display = "block";
timer = setInterval(function() {
rtb.style.opacity = +rtb.style.opacity + .10;
if (+getComputedStyle(rtb).getPropertyValue("opacity") >= 1) {
clearInterval(timer);
}
}, 30)
}
});
document.getElementById("hideRtb").addEventListener("click", function() {
if (rtb.style.opacity != 0) {
clearTimeout(timer);
timer = setInterval(function() {
rtb.style.opacity = +rtb.style.opacity - .10;
if (+getComputedStyle(rtb).getPropertyValue("opacity") <= 0) {
rtb.style.display = "none";
clearInterval(timer);
}
}, 30)
}
});
}
and as you can see, I create a link inside the body with id showRtb and inside that an iframe with content, but when I click it doesn't work, doesn't want to show div with id rtb ...
When I change the content so instead of an iframe I post an image, then it works well, but now with the iframe it doesn't work. Why? What is the problem?
So, I want when I click on showRtb to open div with ID rtb ...
UPDATE:
var content = '<div id="showRtb1" style="position: fixed;text-align:center;left: 0px;width: 225px;height: 80px;top: 50%;z-index: 9999999;cursor: pointer; border-radius:5px; margin-left:-15px;"><iframe src="https://domain.com/hotel/2" name="myiFrame1" scrolling="no" frameborder="0" marginheight="0px" marginwidth="0px" height="100%" width="100%"></iframe></div><div id="showRtb" style="position: fixed;text-align:center;left: 0px;width: 225px;height: 80px;top: 50%;z-index: 99999999;cursor: pointer; opacity:0; pointer; border-radius:5px; margin-left:-15px;"></div><div id="rtb"><iframe src="'+www+'" name="myiFrame" scrolling="yes" frameborder="0" marginheight="0px" marginwidth="0px" height="100%" width="100%"></iframe><div id="hideRtb"><img src="http://i.imgur.com/QqlcQwu.png"></div></div>';

Change this:
var content = '<div id="showRtbn"> <iframe src="https://domain.com/hotel/2" name="myiFrame1" scrolling="no" frameborder="0" marginheight="0px" marginwidth="0px" height="100%" width="100%"></iframe></div><div id="rtb"><iframe src="'+www+'" name="myiFrame" scrolling="yes" frameborder="0" marginheight="0px" marginwidth="0px" height="100%" width="100%"></iframe><div id="hideRtb"><img src="http://i.imgur.com/QqlcQwu.png"></div></div>';
To be something like:
var content = '<div id="showRtbn"><iframe src="https://domain.com/hotel/2" name="myiFrame1" scrolling="no" frameborder="0" marginheight="0px" marginwidth="0px" height="100%" width="100%"></iframe></div>Show RTB<div id="rtb"><iframe src="'+www+'" name="myiFrame" scrolling="yes" frameborder="0" marginheight="0px" marginwidth="0px" height="100%" width="100%"></iframe><div id="hideRtb"><img src="http://i.imgur.com/QqlcQwu.png"></div></div>';
Remove the iFrame from within the anchor tags (<a>..</a>) and you can set its containing <div> as hidden. NOTE: I've removed your styles. You should consider moving them into a stylesheet
JS:
document.getElementById("showRtb").addEventListener("click", function() {
rtb.style.display = "block";
console.log("clicked");
});

re-sizing iframe inside div with js

Trying to figure out a way to to re-size the iframe inside the class="col-md-4 col-sm-12".
I tried resizing all inside that class but attempt failed.
var xx = document.querySelectorAll("#homePage > div:nth-child(2) > div.col-md-4.col-sm-12 > div");
for (var i = 0; i < xx.length; i++) {
xx[i].style.width="450px";
}
HTMl:
<div class="col-md-4 col-sm-12">
<div class="ms-webpart-zone ms-fullWidth">
<div id="MSOZoneCell_WebPartctl00_ctl42_g_ee6207c9_12ab_4c71_aa01_3d615b36437c" class="s4-wpcell-plain ms-webpartzone-cell ms-webpart-cell-vertical ms-fullWidth ">
<div class="ms-webpart-chrome ms-webpart-chrome-vertical " style="width:320px">
<div class="ms-webpart-chrome-title" id="WebPartctl00_ctl42_g_ee6207c9_12ab_4c71_aa01_3d615b36437c_ChromeTitle" style="width:320px;">
<span title=" This is a basic app part with custom properties." id="WebPartTitlectl00_ctl42_g_ee6207c9_12ab_4c71_aa01_3d615b36437c" class="js-webpart-titleCell"><h2 class="ms-webpart-titleText" style="overflow:hidden;text-overflow:ellipsis;text-align:justify;"><a accesskey="W" href="###"><nobr><span>/span><span id="WebPartCaptionctl00_ctl42_g_ee6207c9_12ab_4c71_aa01_3d615b36437c"></span></nobr></a></h2></span>
</div><div webpartid="ee6207c9-12ab-4c71-aa01-3d615b36437c" haspers="false" id="WebPartctl00_ctl42_g_ee6207c9_12ab_4c71_aa01_3d615b36437c" class="ms-WPBody ms-WPBorder noindex ms-wpContentDivSpace " allowdelete="false" allowexport="false" style="width:320px;height:210px;"><div id="ctl00_ctl42_g_ee6207c9_12ab_4c71_aa01_3d615b36437c" style="width: 450px;">
<iframe src="###" id="g_49a1549f_f388_4175_836c_c54ba7e29505" frameborder="0" width="320px" height="210px"></iframe>
</div></div>
</div>
</div>
</div>
</div>

"div.col-md-4.col-sm-12 > div"
This will only give you the very first div in the class.
What you can do is to query both divs and the iframe which then can be traversed.
var xx = document.querySelectorAll("div.col-md-4.col-sm-12 div, div.col-md-4.col-sm-12 iframe");
for (var i = 0; i < xx.length; i++) {
xx[i].style.width="450px";
}
If you just want the iframe to extend to it's parent's width and height then just set the iframe's width and height to 100% in CSS.
iframe{
width: 100%;
height: 100%;
}