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Select all the elements within an element having an attribute set to a specific value

I have the followings defined :
var excludedFiltersPanel = $("#excludedFiltersPanel");
var includedfiltersPanel = $("#includedfiltersPanel");
where *Panel is just a div.
in excludedFiltersPanel there are some div's with attribute data-iscorefilter="true" e.g. :
<div id="filterPanel-LastName" class="filterPanel" data-iscorefilter="true">
<Some Stuff here!>
</div>
I am trying to get them and move them to includedfiltersPanel:
It seems neither of these is a correct syntax:
excludedFiltersPanel.('[data-iscorefilter="true"]')
excludedFiltersPanel.$('[data-iscorefilter="true"]')
1.What is the correct syntax?
2.How do I append them to includedfiltersPanel? (I know how to append a single item, but not sure what is the common good practice here, e.g. using for loop or some JQuery magic)

Since excludedFiltersPanel there are some div's with attribute data-iscorefilter="true"
Use .find()
Description: Get the descendants of each element in the current set of matched elements, filtered by a selector, jQuery object, or element.
It would look like :
excludedFiltersPanel.find('[data-iscorefilter="true"]')

Getting ALL First links in a specific class

So I know that using "a:first" will get the first link of a page. Lets assume we have the following:
<div class="masterclass">
Link 1
Link 2
</div>
<div class="masterclass">
Link 1
Link 2
</div>
Naturally I can use the following code to get the first "a" of the class "masterclass"
$('.masterclass a:first').click(function() {
alert('yayfirstlink');
});
However I do not understand how to get the first link of every "masterclass"

You need to use find() here because your selector will find all the anchor elements with in .masterclass then filter only the very first one. But when you use .find(), it will find all the .masterclass elements first then will find the first anchor element in each of them.
$('.masterclass').find('a:first').click(function() {
alert('yayfirstlink');
});
or if you are sure that the target element will be the first child of its parent then you can use :first-child
$('.masterclass a:first-child').click(function() {
alert('yayfirstlink');
});

Try this,
var oFirstAnchor = $(".masterclass a:first-child");

$(".masterclass a:first-child") is what you are looking for.
so:
$('.masterclass a:first-child').click(function() {
alert('yayfirstlink');
});

This is how u loop through each of the masterclass and get the first link of it.
i don't know what you want to do with it though so i can only provide this
$(document).ready(function(){
var fields = $('.masterclass a:first-child');
$.each(fields, function(index, val){
alert(index);
});
});
this alerts the current links array index
http://jsfiddle.net/kBd82/6/

I would recommend using the first of type selector for this.
$('.masterclass a:first-of-type')
This way it will always select the first anchor tag in each masterclass div even if you put other things in the div later.
http://api.jquery.com/first-of-type-selector/

jQuery select all classes except one ID

I need to select all divs of a certain class (jqx-slider) excluding one ID (#str_prg) - something like:
$("div.jqx-slider :not(#str_prg)").each(function () {
.....
});
What is the correct syntax for that?
Also, would it be faster and more effecient code, if I add a "if" condition inside the loop - like
if($(this).attr('id') ! = "str_prg"){
}
Thanks!

You are using an descendant selector between the class selector and the not selector, which is invalid for your requirement
$("div.jqx-slider:not(#str_prg)")
when you say $("div.jqx-slider :not(#str_prg)") it selects all descendants of elements with class jq-slider except the one with id str_prg

Try to remove an unnecessary space char like this:
$("div.jqx-slider:not(#str_prg)")

Remove the space, as it would cause you to select children, instead of the element itself.
$("div.jqx-slider:not(#str_prg)").each(function() {
.....
});
For the second part of your question, it would be better to just use the CSS selector instead of a JS loop.

Getting previous element of given in dom model

I have list of elements on my page
input
input
span
input
span
etc
I want to select each input that sits before each span, and after do, whatever i will have to. Is there any available ways to do that?

Use prev() to select the previous input of any given span:
$(this).prev("input");
If you're trying to select all previous inputs of all spans in 1 selector try this:
​$("span").prev("input");
http://jsfiddle.net/6hPRa/1/
$("span").prev("input").css("background-color", "pink");​

You have to use .prev()
ex :
$('span').prev("input") //this is input element

Use .parent() or .parents('.selector').first()
jQuery('.given').parent();
OR without jQuery
var el = document.getElementById('id');
el.parentNode...
AHH, previous-element...
Ok, now you have an answer.
Further there is a method
.siblings()
If you want the prev-prev element do so
jQuery('.given').prev().prev();

It's not that easy to define which one should be the first, I suggest go with set tabindex for each of them, and then with that using that as a selector you can always easily grab the previous one or next one

How to gain access to an element on the same level in the DOM?

<div id="dad">
<img id="mum">
<input>
</div>
With jQuery, how could i get access to the input element, get is value or set it for example? I can't work out how to access something on the same level.. and i dont want to be using ID's, just parent/child nodes so i can use the code for loads of dad div's
Thanks!

an addition to Zed,
$(this).parent().children('input');
if you give a name to your input field then you can easily select throughout the others,
$(this).parent().children('input[name=my_input]');
then you can give any value as:
$(this).parent().children('input[name=my_input]').val('any value');
Sinan.

var myEl = $("#dad").children(":input");

$(this).parent().children() ?

Try this, to find the first child input element:
jQuery("div").find("input:first")

If i understand question, you would like achieve input from mum leve?
So try $("#mum ~ input")...
BTW, great site to search jquery function by category http://visualjquery.com/ +nice example.

I guess you want to find siblings (node with same depth and same parent and in DOM tree)
$(el).next() - next element (sibling) for all elements in the set
$(el).nextAll - all following siblings
$(el).nextUntil - all following siblings, stop on some condition (not including first "bad match").
Besides, you have next adjacent selector (+) and next sibling selector.
The same about prev, prevAll and prevUntil.
And you even have a siblings method.
Check this out.