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jQuery Get IDs by Class Name

I have a page of about 15-20 YouTube videos I’d like to dynamically update the img src to point to the YouTube hosted thumbnails. From a logic perspective, I want to find every DIV with a class of “videos”, get the ID of that class and update the image source with the dynamically inserted value, e.g., http://img.youtube.com/vi/DbyNtAQyGs/0.jpg in the first example. All IDs are unique because they are the YouTube video IDs and there is only one img tag under each “videos” class.
This code would run on page load so it would have to be pretty fast to ensure the values are set before the browser passes the each img tag in the DOM. Hoping I can get one of those one liners instead of vars and multiple lines.
<div id="DbyNtAQyGs" class="videos">
<img src="" width="212" height="124" />
</div>
<div id="Fh198gysGH" class="videos">
<img src="" width="212" height="124" />
</div>
Current Code
$('.videos img').attr('src', 'http://img.youtube.com/vi/' + $(this).closest('div').attr('id')); + '/0.jpg');

You can use:
$('.videos img').attr('src', function() { return 'http://img.youtube.com/vi/' + $(this).closest('div').attr('id') + '/0.jpg'; })

Loop through the .videos elements:
$('.videos').each(function(){
var $this = $(this),
_id = $this.attr('id'); // Capture the ID
// Construct the img src
$this.find('img').attr('src', 'http://img.youtube.com/vi/' + _id + '/0.jpg');
});
Bonus: chain in the click event for your anchor:
$this.find('a').click(function(e){
e.preventDefault();
loadPlayer(_id);
}).find('img').attr('src', 'http://img.youtube.com/vi/' + _id + '/0.jpg');
So you can simplify your markup:
<div id="DbyNtAQyGs" class="videos">
<img src="" width="212" height="124" />
</div>

jQuery append an img to every div

I am trying to display a thumbnail image with every thumb class, but currently I am getting the output below where the images are looping inside the href instead. The order of div, href and img must not change. It looks something like this jsfiddle but this isn't fully working of course...
currently getting:
<div class ='thumb'>
<a href="#" rel="1">
<img src="">
</a>
<img src="">
<img src="">
</div>
required output:
<div class ='thumb'>
<a href="#" rel="1">
<img src=>
</a>
</div>
<div class ='thumb'>
<a href="#" rel="1">
<img src="">
</a>
</div>
my loop:
var thumbnails = [];
$.each(data.productVariantImages,function(key, val){
thumbnails.push(val.imagePath);
});
for(var thumb in thumbnails) {
$('.thumb').append($('<img>').attr({
"src":[thumbnails[thumb]]
}));
}
am i looping it wrongly?
edit:
The thumbnails are part of a dynamic gallery where basically every time a user choose a different option in a dropdown list, the sources for the thumbs are supposed to change accordingly.
current html:
<div class="thumbnail"><?php
foreach($skuDetails['productVariantImages'] as $variantImage){
if(isset($variantImage) && $variantImage['visible']){
?>
<div class="thumb">
<a href="#" rel="1">
<img src="<?php echo $variantImage['imagePath']; ?>" id="thumb_<?php echo $variantImage['id']; ?>" alt="" />
</a>
</div> <?php }}?>
</div>
sample array of thumbnails:
["http://tos-staging-web-server-s3.s3.amazonaws.com/9/catalogue/apples_in_season.png",
"http://tos-staging-web-server-s3.s3.amazonaws.com/9/catalogue/apples_in_season.png"]
sample output:
<div class="thumbnail">
<div class="thumb">
<a href="#" rel="1">
<img src="http://tos-staging-web-server-s3.s3.amazonaws.com/9/catalogue/apples.png" id="thumb_323" alt="">
</a>
</div>
<div class="thumb">
<a href="#" rel="1">
<img src="http://tos-staging-web-server-s3.s3.amazonaws.com/9/catalogue/apples.png" id="thumb_323" alt="">
</a>
</div>
</div>

You need to use .each function on .thumb. Something like:
$(document).ready(function(){
$('.thumb').each(function(){
$(this).append($('<img>').attr({"src":[thumbnails[thumb]],}));
});
});

your loop is focused on wrong element. You append img tag to the thumb class. So, the img tags inside the same element. You should create div has thumb class inside the loop, and append it to the thumbnail div. That must like
var div = $(".thumbnail");
$.each(imageArray, function(index, value){
var elem = "<div class='thumb'><a href='#' rel='1'></div>";
div.append($elem);
$('.thumb').append("<img />").attr("src", value);
});
It may be wrong but you should watch the thumbnail element. I cannot write the code to test. But I think the logic must be like this.

If you want that exact structure, I made a demo using plain JavaScript. Enter a number and the thumbClone() function will generate that many. You could probably adapt this function with your existing code easily. I'm in rush, it probably needs refactoring, sorry. :-\
DEMO
function thumbClone(qty) {
var main = document.getElementById('main');
var aFig = document.createElement('figure');
var aLnk = document.createElement('a');
var aImg = document.createElement('img');
aLnk.appendChild(aImg);
aImg.src = "http://placehold.it/84x84/000/fff.png&text=THUMB"
aFig.appendChild(aLnk);
aLnk.setAttribute('rel', '1');
main.appendChild(aFig);
aFig.className = "thumb";
console.log('qty: ' + qty);
var thumb = document.querySelector('.thumb');
for (var i = 0; i < qty; i++) {
var clone = thumb.cloneNode(true);
thumb.parentNode.appendChild(clone);
}
}

You need to use each loop which will get each class rather than getting only one class below is syntax of each loop
$(selector).each(function(){
// do your stuff here
)};
in your case
$('.thumb a').each(function(){
// do your stuff here
$(this).append($('<img />').attr('src',[thumbnails[thumb]]);
)};

Looks like you need to create the entire div structure for each image.
Lets create the below structure dynamically using the max length of the image array and add the image src .
var thumbDivStart = "<div class ='thumb'><a href="#" rel="1">";
var thumbDivEnd = "</a></div>";
var thumbDiv = "";
for (i = 0; i < imageArray.length; i++) {
thumbDiv = thumbDivStart + "<img src="+imageArray[i]+"/>"+
thumbDivEnd;
//Here you can append the thumbDiv to the parent element wherever you need to add it.
}

How to make a list of id's or loop using multiple id's in Javascript?

I am trying to find out how to make a list of variables or preferably a loop that identifies the id's. Here is an example.
thumb1 = document.getElementById("image1");
But instead of it being "image1", I want it to go all the way up to image15.
I'd much rather have a loop with the code above that identifies the id's from "image1" to "image15". I am fairly new to Javascript so any help is appreciated! Thank you!

You could do something like this:
var elements = [];
for(var i = 1; i <= 15; i++) {
var id = "image" + i;
elements.push(document.getElementById(id));
}
But the smarter thing to do would be to just add a single class to all of your image elements and use it in combination with querySelectorAll:
var elements = document.querySelectorAll(".image");
<div>
<img id="image1" class="image" />
<img id="image2" class="image" />
<img id="image3" class="image" />
</div>

Obtaining the ID of an IMG tag in jQuery

I have the following code (in this case for two images - but in reality, it could be replicated N times:
<figure title="" class="DragBox" dragableBox="true" style="opacity: 1;" id="thumb_1">
<span class="pic" id='UAJ754'>
<span class="imagewrap"> </span>
<span class="overlay">
Image Information
</span>
<img src="/pics/UAJ754.jpg" alt="">
</span>
<figcaption class="AlbumFig_Caption">A picture caption.
</figcaption>
</figure>
<figure title="" class="DragBox" dragableBox="true" style="opacity: 1;" id="thumb_2">
<span class="pic" id='JB6732'>
<span class="imagewrap"> </span>
<span class="overlay">
Image Information
</span>
<img src="/pics/JB6732.jpg" alt="">
</span>
<figcaption class="AlbumFig_Caption">A second picture caption.
</figcaption>
</figure>
Now the span which has the class of 'pic' has a jQuery mousedown event associated with it - so that it doesn't matter which image the mouse is clicked on, the pic tag will log the event and display a popup window with data. That all works fine.
But I need to obtain either the ID tag of the specific 'pic' that had the mouse down, or retrieve the src of the IMG so i can get the ID, as this needs to be passed to the popup window to display the correct info for the right picture.
I have the following JS code:
$(".pic").mousedown(function(e) {
var mouseX = e.pageX;
var mouseY = e.pageY;
if (e.which === 3) {
$('.infobox').css({'top':mouseY+'px','left':mouseX+'px'}).fadeIn();
var imgref = $(".pic").attr('id');
alert (imgref);
return false;
}else{
$('.info').fadeOut();
}
});
Again, this works fine, but it only gives me the ID of the first 'pic' span no matter which 'pic' span is clicked. How can I get the ID field of the current 'pic' span ... the one that the mouse was over when the use pressed the button??

try:
var imgref = $(this).attr('id');
or:
var imgref = $(this).prop('id');
instead of :
var imgref = $(".pic").attr('id');
$(".pic") will give the first div that have the class pic not the one you clicked on

var imgref =this.id;
because this is also an object and $(this) is wrapping an object in another object;

var imgref = $('img', this).attr('src');
you will get the src of the IMG.

Instead of using var imgref = $(".pic").attr('id');
Use this: var imgref = $(this).attr('id');

Rewriting HTML code using javascript

I have some markup here that I need to reformat using javascript. Basically, I have this code:
<div id="images">
<img src="01.jpg">
<img src="02.jpg">
<img src="03.jpg">
<img src="04.jpg">
<a id="src" href="01.jpg"></a>
<a id="src" href="02.jpg"></a>
<a id="src" href="03.jpg"></a>
<a id="src" href="04.jpg"></a>
</div>
and I want javascript to rewrite the code so that the images are placed inside the anchors. Like this:
<div id="images">
<a id="src" href="01.jpg"><img src="01.jpg"></a>
<a id="src" href="02.jpg"><img src="02.jpg"></a>
<a id="src" href="03.jpg"><img src="03.jpg"></a>
<a id="src" href="04.jpg"><img src="04.jpg"></a>
</div>
any ideas?

<script>
var div = window.document.getElementById("images");
var anchors = div.getElementsByTagName("A");
var imgs = div.getElementsByTagName("IMG");
for (var i = anchors.length - 1; i >= 0; i--) {
anchors[i].appendChild(imgs[i]);
}
</script>

General strategy:
Get a reference to the "images" div
Create a temporary object to store images, e.g. var imgs = {};
Loop over all img elements within the div. For each element:
Add each element to imgs, using its src as the key
Loop over all a elements within the div. For each element:
Lookup the image from imgs using the element's href attribute
Remove the img from its current location, and re-insert it within the body of the a.