Develop Reference

How to lazy load videos with jquery or javascript

So I am trying to the load a embed video after a image(Splash-Imag) is clicked. The Delay should be 1.5 Seconds
<div id="mv-info">
<div id="content-embed" style="<?php $splash = info_movie_get_meta('fondo_player'); if(empty($splash)) { echo 'display:block;';}?>">
<div class="mplay">
<?php if (get_sub_field('type_player') == "p_iframe") {?>
<?php if($dato = get_sub_field('embed_player')) { ?>
<iframe src="<?php echo $dato; ?>" frameborder="0" allowfullscreen></iframe>
<?php }?>
</div>
Here $dato is the embed URL, Once I click the splash-image(class) in div class mvi-info the splash image goes and video pops out. But what i want to do is delay the video for 1.5 seconds or less so that it doesn't hinder my page speed.
I used this code but it doesn't seem to work
<script type="application/javascript">
$('.mvi-cover').click(function(){
var iframe = $('.mplay iframe').each(function(item){
var src= $(this).data('src');
$(this).attr("src",src);
});
$( ".splash-image" ).fadeOut(function(){
$( ".splash-image" ).remove()
});
$('#content-embed').fadeIn();
})
</script>
If anyone can help me then I will be really grateful.

You could use some jQuery objects to load the iframes without appending them to DOM. And using a timeout, you could do this 1,5 second after the page has finished loading.
Then, on a click event, change the src attribute of the iframe next to the clicked splash image (not all). Since the browser already has loaded the content, it will be instantanous.
I am pretty sure you have many iframes like this because you use a PHP loop. DO NOT use id in that kind of loop that produces HTML. It ends up in multiple time the same id. Use classes instead.
Try that to load the iframes 1.5 sec after page load:
$(document).ready(function () {
let iframes = $(".mplay iframe");
setTimeout(function () {
iframes.each(function (index) {
console.log(`Looping through iframes... #${index+1}`)
// Create a temporary jQuery object just to load
let temp = $("<iframe>")[0];
temp.src = $(this).data("src");
// Make sure the content gets loaded
temp.on("load", ()=> console.log(`The content of Iframe #${index+1} is loaded... The url was ${$(this).data("src")}`) )
});
},1500);
});
And this to handle the click events on the splash images:
$(".mvi-cover").click(function () {
let src = $(this).data("src");
$(this).attr("src", src);
let embed = $(this).next(".content-embed");
$(this).fadeOut(function () {
$(this).remove();
embed.fadeIn();
});
});
I am not 100% sure of your rendered HTML structure... But you get the idea.

Try this:
<div id="mv-info">
<?php if($splash = info_movie_get_meta('fondo_player')) {?><a title="<?php the_title(); ?>" class="thumb mvi-cover splash-image" style="background-image: url(<?php echo $splash;?>)"></a><?php }?>
<?php }?>
<div id="content-embed" style="<?php $splash = info_movie_get_meta('fondo_player'); if(empty($splash)) { echo 'display:block;';}?>">
<div class="mplay">
<?php if (get_sub_field('type_player') == "p_iframe") {?>
<?php if($dato = get_sub_field('embed_player')) { ?>
<iframe data-src="<?php echo $dato; ?>" frameborder="0" allowfullscreen></iframe>
<?php }?>
</div>
<script type="application/javascript">
$('.mvi-cover').click(function(){
var iframe = $('.mplay iframe').each(function(item){
var src= $(this).data('src');
$(this).attr("src",src);
});
$( ".splash-image" ).fadeOut(function(){
$( ".splash-image" ).remove()
});
$('#content-embed').fadeIn();
})
</script>

This code works fine for delay for one source. But not able to get it right for multiple sources.
<div class="mplay">
<?php if (get_sub_field('type_player') == "p_iframe") {?>
<?php if($dato = get_sub_field('embed_player')) { ?>
<script>
window.setTimeout(function () {
var iframe = document.getElementById('myIframe');
iframe.setAttribute('src', '<?php echo $dato;?>');
}, 1500);
</script>
<iframe id="myIframe" src="" frameborder="0" allowfullscreen></iframe>
<?php }?>

Javascript gets only the first id from a foreach loop. Why?

I use a foreach loop to get some tabs with different id's. This way I get tabs with ids tab1, tab2, tab3, etc. Than, when I want to get the id of each tab using javascript, it returns only the id of the first tab and uses this for all tabs. It does not loop as php do. Why?
<?php
foreach ($DB_con->query($foos) as $foo) {
?>
<div id='tab<?php echo $counter_foo; ?>'>
<div id="divid" style="visibility: hidden"><?php echo $counter_foo; ?></div>
<script>
$(document).ready(function() {
var dividvalue = document.getElementById('divid').innerHTML;
alert(dividvalue);
});
</script>
<?php
}
?>

Change the id in your HTML to class, and use getElementsByClassName instead of getElementById your in JavaScript.
Your div:
<div class="divid"> <!-- etc -->
and your JS..
var dividvalue = document.getElementsByClassName('divid')[0].innerHTML;
Also consider changing divid to divclass for consistency's sake.
Full edited code:
<script>
var i = 0;
</script>
<?php
foreach ($DB_con->query($foos) as $foo) {
?>
<div id='tab<?php echo $counter_foo; ?>'>
<div class="divclass" style="visibility: hidden"><?php echo $counter_foo; ?></div>
<script>
$(document).ready(function() {
var divclassvalue = document.getElementsByClassName('divclass')[i].innerHTML;
alert(divclassvalue);
i++;
});
</script>
<?php
}
?>

Links not working in a Repeat Region in JQuery

I recently download this Slideshow with jmpress.js for a website. I'm using PHP and a database in MYSQL. I used a recordset in Dreamweaver to get the data from database to the site. Then I tried to create a Repeat Region to show the latests posts in the slider.
Headings, images and text are working fine. The problem is on the href (links), which are not changed and remain the same (the ID of the latest post) for all records.
In the head I have these files:
SlideshowJmpress/css/style.css
http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js
SlideshowJmpress/js/jmpress.min.js
SlideshowJmpress/js/jquery.jmslideshow.js
SlideshowJmpress/js/modernizr.custom.48780.js
Here is the HTML Code:
<section id="jms-slideshow" class="jms-slideshow">
<?php do { ?>
<div class="step" data-color="color-1">
<div class="jms-content">
<h3><?php echo $row_slider['packageTitle']; ?></h3>
<p><?php echo $row_slider['packageDescription']; ?></p>
<a class="jms-link" href="article.php?ID=<?php echo $row_slider['ID']; ?>">Read more</a>
</div>
<img src="<?php echo $row_slider['packageGraphic']; ?>" width="300px;" height="300px;" />
</div>
<?php } while ($row_slider = mysql_fetch_assoc($slider)); ?>
</section>
<script type="text/javascript">
$(function() {
$( '#jms-slideshow' ).jmslideshow({
});
});
</script>
Here is the php code for the recordset:
$maxRows_slider = 4;
$pageNum_slider = 0;
if (isset($_GET['pageNum_slider'])) {
$pageNum_slider = $_GET['pageNum_slider'];
}
$startRow_slider = $pageNum_slider * $maxRows_slider;
mysql_select_db($database_nipvlach, $nipvlach);
$query_slider = "SELECT * FROM pages ORDER BY `date` DESC";
$query_limit_slider = sprintf("%s LIMIT %d, %d", $query_slider, $startRow_slider, $maxRows_slider);
$slider = mysql_query($query_limit_slider, $nipvlach) or die(mysql_error());
$row_slider = mysql_fetch_assoc($slider);
if (isset($_GET['totalRows_slider'])) {
$totalRows_slider = $_GET['totalRows_slider'];
} else {
$all_slider = mysql_query($query_slider);
$totalRows_slider = mysql_num_rows($all_slider);
}
$totalPages_slider = ceil($totalRows_slider/$maxRows_slider)-0;

Error is either in IDs in your DB or in the slideshow script i think.
Look at source of your page. Are the links right ?

I think that the problem is in the script or in the jmpress.min.js
When I changed slider, everything worked fine!

Button to reload the contents of a div which contains php

I have a div containing php that loads a random image from a directory. This bit works fine when i reload the page. The code:
<div id="imageArea">
<?php
$dir = 'images/assets/';
$images = scandir($dir);
$i = rand(2, sizeof($images)-1);
?>
<img src="images/assets/<?php echo $images[$i]; ?>" alt="<?php echo str_replace(array('.jpg', '.png', '.gif'), '', $images[$i]); ?>"/>
</div>
And further down the page i have another div that contains a button. I want it so that when people click this button it loads a new random image, i guess it would reload the div, but i don't want it to reload the page, is that possible? The button:
<div id="newPic">
<input type="button" value="Reload" id="Reload"/>
</div>
I have tried:
<script>
$(document).ready(function(){
$("#Reload").click(function(){
$("#imageArea").html("result reloaded successfully");
});
});
</script>
and:
$(document).ready(function(){
$("#Reload").click(function(){
$("#imageArea").html(ajax_load).load(loadUrl);
});
});
I am new to php and javascript and so i have been following other peoples instructions.
Thank you

split your php script to another file (just echo the img tag), and then use ajax to call that page.
$("#reload").click(function(){
$.ajax({
url:"demo.php",success:function(ajax_load){
$("#imageArea").html(ajax_load)
}});
});
php file
<?php
$dir = 'images/assets/';
$images = scandir($dir);
$i = rand(2, sizeof($images)-1);
?>
<img src="images/assets/<?php echo $images[$i]; ?>" alt="<?php echo str_replace(array('.jpg', '.png', '.gif'), '', $images[$i]); ?>"/>

have you tried to use ajax to update the div with the image?
here's the code
$(document).ready(function(){
$('#clickme').click(function(){
var number = 1 + Math.floor(Math.random() * 10);
$('#contentimg').attr('src','0'+number+'.jpg');
});
});
this would work given that the images are in the same folder else give the src of image accordingly

html vertical auto scroll with javascript

Im new with pure javascript (well i found its easy to use jquery, but its too bad i cant use jquery in this case :D).
I tried to follow this sample code, but its not working in my web.
This is a screen shoot and explanation of my web :
So, this page is separated into 2 different html file, one for header and its jquery tabs, the other one for the content below the tab.
My plan is to let the content below the jquery tabs scrollable, so the following code is from the html of my content (below the jquery tabs):
<body>
<script type="javascript">
function top() {
document.getElementById( 'top' ).scrollIntoView();
};
function bottom() {
document.getElementById( 'bottom' ).scrollIntoView();
window.setTimeout( function () { top(); }, 2000 );
};
bottom();
</script>
<div id="form_search">
<div id="top">top</div>
<?php echo form_open('backend/index') ?>
<p>
Kelas :
<?php echo form_dropdown('ddl_kelas1', $list_kelas, 'id="ddl_kelas1"');?> -
<?php echo form_dropdown('ddl_kelas2', $list_kelas, 'id="ddl_kelas2"');?>
</p>
<p>
Nama : <?php echo form_input('txt_nama');?>
Alamat : <?php echo form_input('txt_alamat');?>
Tanggal Lahir : <input type="text" id="datepicker" />
</p>
<?php echo form_submit('btn_search', 'Search');?>
<?php echo form_close(); ?>
</div>
<div>
<?php echo $table ?>
<?php echo $pagination ?>
<div id="bottom">bottom</div>
</div>
Please note that the top and bottom div is just for the page limit (i followed the sample code above).
I have tried another way like change the id/element used for limit, but its still not working.
Thank you for your help :D
Note : i use codeigniter framework for this project :D

It seems the solution to the user's question was to simply add overflow-y:scroll into the css for the div tag where the content was being placed. simple solution

jQuery
$("html, body").animate({ scrollTop: $('#bottom').offset().top }, 2000);
^ ^ ^
What to scroll ---------------------- to which element --------- duration

There seemed to be a lot of extra stuff in the bottom of your html screen in fiddle. I took that out and adjusted some of the javascript.
But taking the extra out did the trick already ...
// extra stuff starting at line 332
<script>
/* by: thinkingstiff.com
license: http://creativecommons.org/licenses/by-nc-sa/3.0/us/ */
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-555555-6']);
// more stuff
http://jsfiddle.net/djwave28/pA9QZ/3/