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Delete only the particular Div Id

<div id="#("Bottomgrid)" class="dgd2"></div>
var element = document.getElementById("#Bottomgrid");
element.empty();
$('.dgd2').empty()
Instead of deleting only Bottom grid its also removing other Div present in the screen.

jQuery .remove() will remove the set of matched elements from the DOM.
While jQuery .empty() will remove all child nodes of the set of matched elements from the DOM.
Considering if you have your HTML as below :
<div id="Bottomgrid" class="dgd2"></div>
and you want to remove div with id="Bottomgrid"
Then your javascript code will be :
$("#Bottomgrid").remove();
//This is not required as far as I see
//$('.dgd2').empty()

If you have a HTML structure like this:
<div class="holder">
<div id="item1">Hey</div>
</div>
you can simply just use this pure JavaScript code to remove the "item1" element:
var element = document.getElementById("item1");
element.parentNode.removeChild(element);

.empty() doesn't remove element it only removes elements children. use $('#Bottomgrid').remove()

Javascript :
document.getElementById("Bottomgrid").remove();
Jquery:
$( "#Bottomgrid" ).remove();

you should give the div name properly like Below how I am writing the Id. also you need to check properly which div you are going to delete. Because if a nested div present in your page and you are going to delete the div which is having all the child div inside that , then all respective div going to be deleted .
Html
<div id="bottomgridDiv" class="dgd2">
<div id="parentDiv" class="dgd2">
<div id="childDiv" class="dgd2">
</div>
</div>
</div>
Javascript
var element = document.getElementById("#bottomgridDiv");
In JQuery:-
$("#bottomgridDiv").remove();
So now if you wants to delete the bottomgridDiv then what ever the div present inside this is going to delete.

Jquery set class to all elements except element with specific class + children/children of children

I want to hide all elements except for an element with a specific class AND all elements inside this.
right now im using
$("body").not(".embedded").hide();
But it also hides the elements inside my .embedded element.
I appreciate every help.

Use * and space to indicate all direct/nested children. Also, for the initial selector, use body * to indicate all children before the not() filtering
$("body *").not(".embedded, .embedded *").hide();

Here you are:
$('body :not(".class2")').hide();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<span class="class1">11111</span>
<span class="class2">
10
<span class="class21">11</span>
<span>12</span></span>
<span class="class1">11111</span>
Hope this helps.

How to select a DIV if its child has any children?

I'm trying to select any divs on a page if a certain child of theirs has any children of its own.
Here's how the structure looks:
<div id="ID-SOME_LONG_ID">
<div class="GK">
<div id="SOME_LONGID_#1434646398866197"></div>
</div>
</div>
So I want to select all divs with id ID-SOME_LONG_ID only if the GK DIV has any children. It may or may not.
ID- stays the same and SOME_LONG_ID changes with each one.
The other one SOME_LONG_ID is the same on as the parent, and after the # it's a 16 digit number that is random.
Would using Regex be a good idea to look for them or maybe using jQuery's .children() like $( ".GK" ).children()?
Thank you!

Use :has(), :empty, and :not()
$('#ID-SOME_LONG_ID:has(.GK:not(:empty))')
However, note, :empty will fail if you want real children without text nodes. In that case you can do
$('.GK').filter(function() {
return $(this).children().length > 0;
});

jQuery select child of closest element

Basically I want to be able to select the div level2 parent from the child level4 div. My application does not has such classes, otherwise I'd just select level2 :)
<div class="level1">
<div class="level2">
<div class="level3">
<div class="level4"></div>
</div>
</div>
<div class="level2"> <!-- this is hidden -->
<div class="level3">
<div id="start" class="level4"></div>
</div>
</div>
</div>
I start with $('#start') and search for the first parent which is visible, but I'm not seeing a way to return the child of that parent. Searching for $('#start') inside the parent seems very wasteful as I start with a sub child to begin with.
$('#start').closest(':visible') // returns level1
$('#start').closest(':visible').first() // returns the first level2. I can't just use second because the number of level2s can change.
$('#start').closest(':visible').children().each(function(){ /* do some search to check it contains `$('#start')` }) // seems very wasteful.
Another way to look at what I'm trying to say would be; start in the middle, find the outside (the visible element), and move one element in.

How about this:-
$('#start').parentsUntil(':visible').last();
This will give you all hidden parent div's until its visible parent and last() wil give the outermost parent which is hidden. last is not a selector on position it is the last() in the collection.

You want the .has() method
Description: Reduce the set of matched elements to those that have a descendant that matches the selector or DOM element.
$('#start').closest(':visible').children().has('#start');
See fiddle for example.

You say that the classes don't exist...why not add them? It would make thinks much easier to find. The class names don't need to have actual styles associated.
var allLevel4 = $('#start').closest(':visible').find('.level4');
var firstLevel4 = $('#start').closest(':visible').find('.level4')[0];
var secondLevel4 = $('#start').closest(':visible').find('.level4')[1]; //also, #start

Use .filter():
$('#start').closest(':visible').children().filter(':first-child')
.find() is also good for selecting pretty much anything.

jQuery looping through .children of .children

I've been looking over previously asked questions and can't seem to find a solution for my scenario...
I'd like to be able to loop through all children and children of children, etc...
the markup from design looks similar to this
<div>
<div>
<label></label>
</div>
<div>
<label></label>
</div>
<div>
<label></label>
</div>
</div>
I'd like to be able to select all labels within a specific div, regardless of their direct parent.

I'd like to be able to select all labels within a specific div, regardless of their direct parent.
It's just CSS selector notation. Assuming that <div> has an ID of myDiv:
$('#myDiv label').each(function ()
{
// do stuff
});

You do not need to keep stepping down through children in order to find labels within a specific div. This will do the job for you:
$('#idOfDiv label')

$('div label') will select any descendant of that div, regardless of depth. If you want it to be children or children of children, you can select like $('div > label, div > * > label')

Use the find function (instead of children) like so: $('#container').find('label')

$('div:first').find('label') will give you each label element

To select all labels:
$('label').something();
To select all labels contained in a div:
$('label', 'div').something();