Develop Reference

How to configure TinySort to put elements without an attribute last?

I can't make TinySort put elements with a missing attribute below the sorted elements. Options like "place" and "emptyEnd" don't change the order at all.
Please take a look:
https://jsfiddle.net/dm8cz4ra/1/
If I pick only the elements with the attribute using nodeList = $('#list > div[position]') they always land at the end.

I think it is working, but you need to inform TinySort that a position is existing. So instead of:
<div id="list">
<div position="0">0</div>
<div position="-1">-1</div>
<div position="1">1</div>
<div>NULL</div>
</div>
Use
<div id="list">
<div position="0">0</div>
<div position="-1">-1</div>
<div position="1">1</div>
<div position="">NULL</div>
</div>
Fiddle

jQuery - How to hide an element and its children?

I have a div which I would like to hide along with all of its children. I thought that a simple selector.hide() would do the trick but it's still there.
HTML
<div class="row well">
<div class="artistAlbumInfo well col-md-6 ">
<h3><span id="artist"></span> - <span id="track"></span></h3>
<img src="" id="art" class="albumArt">
</div>
<div class="col-md-6">
<h3 id="album"></h3>
<h4>Playstate <p id="playState"></p></h4>
<h4>Position <p id="position"></p></h4>
</div>
</div>
JQuery
$(document).ready(function() {
$('.row .well').hide();
});
http://jsfiddle.net/375c8v2a/1/
Any ideas?

You don't need a space between classes if you want to hide only those with both classes
$('.row.well').hide();
To do either or add a comma
$('.row, .well').hide();

What you have didn't work because .row .well means "an element with class well inside (as a child or deeper descendant) an element with class row. In CSS, the space is the descendant combinator.
To seelct the element that has both classes, remove the space:
$(document).ready(function() {
$('.row.well').hide();
// ----^
});
That means "an element with class row and class well".

$('.row').hide();
please remove second class

From what I've read on the comments the .well class was intentionally created to specify which .row class will be hiding since you have a lot of row classes. Then you can use it as the trigger to hide that row, instead of doing: $('.row.well').hide(); you can just simply specify the targeted class by doing:
$('.well').hide();
Click here to see a example on jsFiddle

JQuery. Remove a previous sibling in the DOM tree

I have the next code dynamically created using JQuery. Theere are multiple row class divs placed one under the other.
<div class="row">
....
</div>
<div class="row">
<div class="line_type"></div>
<div class="download_value"></div>
<div class="flag"></div>
<div class="email"></div>
<div class="prize"></div>
</div>
<div class="row">
....
</div>
After i create these divs I have a "pointer" to a specific div which is of class row. In JQuery, how do i make it so I go down the DOM tree, until i reach the div of class line_type and download_value and remove them both, and also I'd like to go one more node down, at the div of type email and change some of it's CSS attributes.
I was not able to find anything on the web, maybe it's cause i'm a noob at these still.

I have a "pointer" to a specific div which is of class row ->
Assuming that you have the this object of the corresponding div with class row.. then you can use .find to get the line_type and download_value inside that div.
$(this).find('.line_type').remove();
$(this).find('.download_value').remove();
Then you can use the same .find to get the div with class email and access the .css
$(this).find('.email').css(/* You code*/);

Assuming row_pointer points to the row in question:
$('.line_type, .download_value', row_pointer).remove();
$('.email', row_pointer).css(...);

check this out
$('div.row').bind('click', function() {
$this = $(this);
$('div.line_type, div.download_value', $this).remove();
$('div.email', $this).css('background-color', 'red');
});
http://jsfiddle.net/YvyE3/

this find parent of another div and toggle its child using jQuery

I've done some research and nothing seems to be working. Here is the HTML followed by the JavaScript I am putting together. What I am trying to do is set it up so that whenever dashboard_gear_options is clicked, it toggles the appropriate hidden options row. Each block of code exists multiple times at different locations on the page. I tried using this, find, parent, next and children to no avail.
HTML:
// start block
<div class="content_block_holder">
<div class="content_top">
<div class="dashboard_gear_options"></div>
<div class="dashboard_gear_divider"></div>
</div>
<div class="dashboard_holder">
<div class="hidden_options_row"></div>
</div>
</div>
// end block
// start block
<div class="content_block_holder">
<div class="content_top">
<div class="dashboard_gear_options"></div>
<div class="dashboard_gear_divider"></div>
</div>
<div class="dashboard_holder">
<div class="hidden_options_row"></div>
</div>
</div>
// end block (etc..)
JS:
$(document).ready(function(){
$('.dashboard_gear_options').click(function(){
$(this).parent('.content_block_holder').find('.hidden_options_row').toggle();
});
});

Try using closest([selector]) ( http://api.jquery.com/closest/ ) instead of parent in your selector. It will traverse up the tree and find "content_block_holder". parent([selector]) will just check the immediate parent and return an empty set if it doesn't match the selector provided.
$(document).ready(function(){
$('.dashboard_gear_options').click(function(){
$(this).closest('.content_block_holder').find('.hidden_options_row').toggle();
});
});
JSFiddle based on your code: http://jsfiddle.net/gK7yM/

try this
$(this).closest('.content_block_holder').find('.dashboard_holder').find('.hidden_options_row').toggle();

Also this chain works:
$(this).parent().next('.dashboard_holder').children('.hidden_options_row').toggle();
or
$(this).parent().next('.dashboard_holder').find('.hidden_options_row').toggle();

How to find the last child of an element?

<div id="main">
<div class="1"></div>
<div class="2"></div>
<div class="2"></div>
<div class="3"></div>
<div class="3"></div>
<div class="4"></div>
</div>
How we can write a selector using :last-child in jquery to find out the last div with class 3 ?

Try this selector... though your classes shouldn't be just numbers. They should start with a normal character.
$("#main .3:last")
FYI, :last-child checks if the target is last child of its parent. None of the elements with class .3 are the last child of their parent.

Use .last():
$("#main .3").last();
http://api.jquery.com/last/
http://jsfiddle.net/E64Wm/1/

$('#main > .3').last() should point to the right element

Try this:
$('#main').find(':last-child');