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Append class name to an iframe id that is included under a div class

I have the following code
<div id="ad">
<div id="adsensebanner">
<iframe id="google_ad_randomnumber">
</iframe>
</div>
</div>
and I'm searching of a way to make it like this, using jQuery and CSS attributes matching:
<div id="ad">
<div id="adsensebanner" class="addedclass">
<iframe id="google_ad_randomnumber">
</iframe>
</div>
</div>
Any ideas for searching for div that has another parent div and appending a class to the child one?

Your comments on various answers suggest your HTML is invalid and has more than one id="adsensebanner" in it, but just one id="ad" in it.
Your best bet is to make the HTML valid. There can be only one element with id="adsensebanner" in it.
However, if for some reason you want to only target that one element when it's inside id="ad":
document.querySelector("#ad #adsensebanner").classList.add("addedclass");
or with jQuery:
$("#ad #adsensebanner").addClass("addedclass");
That says "Add 'addedclass' to #adsensebanner only if it's inside #ad." There can be valid use-cases (if the one element with id="adsensebanner" may or may not be within #ad and you don't want to add the class if not), but they're rare.
If you correct the HTML to only have one id="adsensebanner", and you always want to add the class, then:
document.getElementById("adsensebanner").classList.add("addedclass");
or with jQuery:
$("#adsensebanner").addClass("addedclass");
In a comment you've said:
The double division check will definately work, however, my second div's ID name varies, so I would like to have it selected via an attr, like div[id*='adsensebanner']. Is there any workaround for this?
Yes, you can use any of the attribute substring selectors. For instance, if the id will always start with adsensebanner (id="adsensebanner1", id="adsensebanner2", etc.), then the selector to use with querySelector or jQuery would be "#ad div[id^=adsensebanner]". (Or you can use the contains one you mentioned, *=, or $= if it always ends with something.)

Try below:
$('#adsensebanner', window.parent.document).addClass("addedclass");

Simple JS can do the trick. And I can't see this div is inside the iFrame.
var p = document.getElementById("ad");
p.querySelector("[id='adsensebanner']").classList.add("addedClass");
<div id="ad">
<div id="adsensebanner">
<iframe id="google_ad_randomnumber">
</iframe>
</div>
</div>

This is only by JavaScript:
document.getElementById("ad").getElementsByTagName("div")[0].classList.add("addedClass");
$( "#ad div:nth-last-child(1)" ).addClass("addedClass");
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="ad">
<div id="adsensebanner">
<iframe id="google_ad_randomnumber">
</iframe>
</div>
</div>
<div id="ad1">
<div id="adsensebanner">
<iframe id="google_ad_randomnumber">
</iframe>
</div>
</div>
This will add a class only to div which have parent div id="ad"

show/hide div with dyamically assigned class

I am dynamically assigning the div id based on the api call back data. For example I have a bunch of data returned which is appended to a div and I can assign the div id with a unique ip address. I have full control over what I can assign i.e. DIV id or class or whatever..
I have attached an example of what the output looks like and hopefully it will clarify what i am looking for.
What I want to be able to achieve is when an endpoint link is clicked, it will show the respective div and hide all other DIV data boxes.. The endpoint links can made clickable and i can add onclick scripts to them or whatever needs to be done
Whether we use the div id or class name i am not fussed.

This should work just fine.
Assign your div with a class, in the demo i'm using EndPoint. The onclick function will use the class to find the div element and hide it. Then it will use this the element used to trigger the function, target the div within that element and show it.
$('.EndPoint').on('click', function () {
$('.EndPoint').find('div').hide();
$(this).find('div').show();
});
.EndPoint div{display:none;}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="EndPoint">
End Point [0]
<div><b>IP Address:</b> 216.12.145.20</div>
</div>
<div class="EndPoint">
End Point [1]
<div><b>IP Address:</b> 172.230.105.123</div>
</div>
<div class="EndPoint">
End Point [2]
<div><b>IP Address:</b> 206.204.52.31</div>
</div>
If you don't understand anything please leave a comment below and I will get back to you as soon as possible.
Edit - jQuery Append with onclick
var IPs=["216.12.145.20","172.230.105.123","206.204.52.31"];
//Foreach value in array
$.each(IPs, function(i,v) {
//Append to id:container
$('#container').append('<div class="EndPoint">End Point ['+i+']<div><b>IP Address:</b> '+v+'</div></div>');
});
$('.EndPoint').on('click', function () {
$('.EndPoint').find('div').hide();
$(this).find('div').show();
});
.EndPoint div{display:none;}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="container"></div>
I hope this helps. Happy coding!

Since elements are dynamically generated it's better to do with classes IMO.
HTML
<div id="endpoint1">
<a href='#' class='clicker'>End Point 1</a>
<p class='hideThis'>1.1.1.1</p>
</div>
<div id="endpoint2">
<a href='#' class='clicker'>End Point 2</a>
<p class='hideThis'>1.1.1.1</p>
</div>
<div id="endpoint3">
<a href='#' class='clicker'>End Point 3</a>
<p class='hideThis'>1.1.1.1</p>
</div>
JavaScript (using JQuery)
$('.clicker').on('click', function () {
$('.hideThis').hide();
$(this).next().show();
});
http://jsfiddle.net/ksvexr40/1
If you want to hide the content initially, just add the following CSS class which hides the content initially.
.hideThis{
display: none;
}

jquery custom data attribute not working inside div tag

I am using this div code
<div data-role="page" data-last-value="43" data-hidden="true" data-options='{"name":"John"}'></div>
and trying to print the values like
japp.init = function () {
console.log($("div").data("role"));
console.log($("div").data("lastValue"));
console.log($("div").data("hidden"));
console.log($("div").data("options").name);
});
This works fine if I put the above div tag directly inside body but as I put the div tag inside any other div tag it does not work and says undefined.
<div class="page">
<div data-role="page" data-last-value="43" data-hidden="true" data- options='{"name":"John"}'></div>
</div>
console prints undefined for above html.
Please let me know if anything is not clear

When getting data jQuery returns data from the first element matching selector, if the first div in DOM has no data - jquery won't return it.
try
japp.init = function () {
console.log($("div[data-role]").data("role"));
console.log($("div[data-lastValue]").data("lastValue"));
console.log($("div[data-hidden]").data("hidden"));
console.log($("div[data-options]").data("options").name);
});
or better give this div an id, and select by id like $('#someid').data('role')

Your selector is div and when you have more divs on your page jQuery will select (in this case) the first one.
<div class="page">
<div data-role="page" data-last-value="43" data-hidden="true" data- options='{"name":"John"}'></div>
</div>
In the above HTML the first div does not have data-* so it will result with an undefined value
You have to be more specific with your selectors
$('.page div').data('role')
Or
$('div:first div').data('role')

Try
$("div.page div").each(function(){
console.log($(this).data("whatever_you_need"));
});
etc.
This way you will cycle through all divs nested in div with class 'page'.

You aren't exactly specifying which div to get. Whenever you are trying to get specific data from a specific element, you should be sure which div you are accessing. This can either occur within an iteration of elements or by ID or an element in relation to an ID. It shouldn't be done based on tagname or even classname as they can be multiple. In this case, why not add an ID on the div you are trying to get so you can access it specifically:
<div class="page">
<div id="thisDiv" data-role="page" data-last-value="43" data-hidden="true" data- options='{"name":"John"}'></div>
</div>
Then access:
console.log($("#thisDiv").data("role"));
Also, it is bad for performance to wrap the same jquery object over and over, you can cache it like this:
$thisDiv = $("#thisDiv");
console.log($thisDiv.data("role"));
....

I believe it is because $("div") returns all occurrences of div and then selects the first to perform a function on. I'm not sure how you want to use this functionality but it might be worth considering something like this
JSFiddle where a class is used to select the correct div
$(function(){
console.log($(".div").data("role"));
console.log($(".div").data("lastValue"));
console.log($(".div").data("hidden"));
console.log($(".div").data("options").name);
});

give your Div a class like class="myClass"
<div class="page">
<div class="myClass" data-role="page" data-last-value="43" data-hidden="true" data- options='{"name":"John"}'></div>
</div>
and then you can change your jquery selector:
japp.init = function () {
console.log($(".myClass").data("role"));
console.log($(".myClass").data("lastValue"));
console.log($(".myClass").data("hidden"));
console.log($(".myClass").data("options").name);
});
otherwise jquery don't know which div you are looking for.
I hope this will help

jquery double function each

I have the following block of HTML code more than once
<div id="page_1" class="page">
<div class="imageDetail_bg">
<img src="../_img/detail_car.jpg" alt="" id="car_detail" class="car_detail"/>
</div><!-- imageDetail-->
<div id="listThumbs">
<div id="thumbsContainer_1" class="thumbsContainer">
<div id="areaThumb" class="areaThumb">
<div id="posThumb_1" class="posThumb">
<img src="../_img/detail_car.jpg" class="detail_img" alt="">
</div>
</div><!--areaThumb-->
<div id="areaThumb" class="areaThumb">
<div id="posThumb_2" class="posThumb">
<img src="../_img/detail_car.jpg" class="detail_img" alt="" />
</div>
</div><!--areaThumb-->
...
...
...
</div><!--listThumbs-->
</div><!--page-->
and the following jQuery code:
$('.page').each(function(i) {
$('.areaThumb').each(function(j) {
$('.detail_img').eq(j).click(function(){
$('.car_detail').eq(i).attr('src', $(this).attr('src'));
});
});
});
What I want to do is: For each page there's a block of thumbs, and when I click in any thumb, the image in #car_detail is replaced by the image of the thumb I clicked. At this moment I can do this, BUT the #car_detail image is replaced in all pages. I'm not getting individually actions for each page. Every click make the action occurs in all pages.
Can anyone tell me what I'm doing wrong?
Thanks

You need not iterate through each element of the jquery selector result to bind a click event.
And you are missing a closing div for thumbsContainer div, add that before each .
Also if you have an element with id car_detail then you should use #car_detail instead of .car_detail
Working example # http://jsfiddle.net/2ZQ6b/
Try this:
$(".page .areaThumb .detail_img").click(function(){
$(this).closest("div.page").find('.car_detail').attr("src", this.src);
});
If the .detail_img elements are being used for the car_detail image then you can simplify the above code to:
$(".detail_img").click(function(){
$(this).closest("div.page").find('.car_detail').attr("src", this.src);
});

You need to give context to your children nodes:
$('.page').each(function(i) {
$('.areaThumb', this).each(function(j) {
$('.detail_img', this).eq(j).click(function(){
$('.car_detail', this).eq(i).attr('src', $(this).attr('src'));
});
});
});
Every this is pointing to the current element given by the jquery function that called it.
[edit] Cybernate found a better way to do what you wanted to. My answer mostly explains why your code did not work as you wanted

I think you have the wrong approach about this,
You should just use cloning and you will be fine...
HTML
<div class="holder">Replace Me</div>
<div>
<div class="car"><img src="img1" /></div>
<div class="car"><img src="img2" /></div>
</div>
JS
$('.car').click(function(){//when you click the .car div or <img/>
var get_car = $(this).clone();//copy .car and clone it and it's children
$('.holder').html('').append(get_car);//put the clone to the holder div...
});
I think this is what you should be doing, simple and elegant... do not understand why you complicate as much :)

jQuery hierarchy issue with next()

Seems like $("img").next().hide(); is not working when both the image and div tag are a child of a paragraph.
<p>
<img src="image.jpg" />
<div>text</div> // this div is set to 'display: none' by default in css
</p>
Yet, if I substitute <div> with <span>
<p>
<img src="image.jpg" />
<span>text</span>
</p>
or if I omit the <p> tags
<img src="image.jpg" />
<div>text</div>
the jQuery selector does work properly. Any ideas why this is the case? Is it related to inline and block display? How can I make it work as described in the top code example?
This is the jQuery code I am using:
$(document).ready(function(){
$("img").hover(
function()
{
$(this).next().show();
},
function()
{
$(this).next().hide();
}
);
});
Thanks for your help!

You should not use block element (DIV) inside inline elmenents (P).
Instead of P use DIV with class set like P.

The p element does only allow inline-level elements as child elements. This may be the reason for why your first example does not work.