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Is there a way to skip a specific CSS selector in HTML when using querySelector in JavaScript?

I need to skip this querySelector('input') because in certain instances the input will come second instead of first. Is there a way to label an element in HTML as 'skip this'?

You're free to utilize the full power of CSS syntax there. In your example if you only want to get input if it's the first parent's element then query like this:
querySelector('input:first-child');
Or if you want to get precise use :nth-child selector, or even better, :nth-of-type:
querySelector('input:nth-of-type(1)');
But the best solution would be to mark your input with a class or id and use it instead:
querySelector('.myInput');
You can of course combine it with negation selector:
querySelector('.myInput:not(':nth-child(2)')');

querySelector returns the first Element that matches the selector provided in the method. And why wouldn't it? That's what it's supposed to do.
A.E. the below returns the first input tag it can find on the document from the top-down.
document.querySelector("input");
It will always return the first input tag it can find. You have two options to "skip" the node. You can either write a function to recursively check if the input should be skipped( kind of superfluous and bad looking ) or you can simply be more specific with your selector.
Either way you need to give the input element you want to skip some sort of recognizable trait. That can be a name property or a dataset property or a class or an id - anything that you can programatically check for.
//functional example
function ignoreSkippable() {
let ele, eles = Array.from(document.querySelectorAll("input"));
eles.some(elem => !elem.matches('.skippable') ? ele = elem : false);
return ele;
}
console.log( ignoreSkippable() );
// <input value="second input"></input>
//specific selector example
let ele = document.querySelector("input:not(.skippable)");
console.log(ele); // <input value="second input"></input>
<input class="skippable" />
<input value="second input" />

select a string after a substring in an element's class name

I have an element that contains an input text, to get the input text I'm using the jQuery method find.
The input text has a class name like this page-id-x with the x is variable, so I want to select that number after the substring page-id, and this is what I tried :
var id = ui.item.find('input').attr('class').split(/\s+/).filter(function(s){
return s.includes('page-id-');
})[0].split('-')[2];
console.log(id);
I think this code is too complicated, but I couldn't figure out some other way to do it.
If someone knows a better way, I'll be thankful.
Thanks in advance.

I'm going to assume the x part of page-id-x, not the id part, is what varies (since that's what your code assumes).
Another way to do it is with a regular expression, but I'm not sure I'd call it simpler:
var id = ui.item
.find('input')
.attr('class')
.match(/(?:^|\s)page-id-([^- ]+)(?:\s|$)/)[1];
Example:
var ui = {
item: $("#item")
};
var id = ui.item
.find('input')
.attr("class")
.match(/(?:^|\s)page-id-([^- ]+)(?:\s|$)/)[1];
console.log(id);
<div id="item">
<input class="foo page-id-23 bar">
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
The above makes the same assumptions your current code does, which are:
The first input in ui.item is the one you want
It will have the relevant class name
I assume those are okay, as your question is asking for an alternative, suggesting what you have is working.

As you're using jQuery, take a look at this: https://api.jquery.com/category/selectors/attribute-selectors/
For your case, you can use $('[class^="page-id-"'). These types of selectors (listed on the link above) actually work in CSS, too. (At least most should, if not all.)
To get the number after page-id-, my suggestion would be to store that number in some other HTML attribute, like data-pageID="1" or the like.
So you could have:
<div id="page-id-3" data-pageID="3">CONTENT</div>
Then, when you have the DOM element using $('[class^="page-id-"'), you can access that number with .attr('data-pageID').val().

If you can control the HTML markup, instead of using class names, you can use data attributes instead. For example, instead of:
<input class="page-id-1">
You can use:
<input data-page-id="1">
Then jQuery can find this element effortlessly:
$('[data-page-id]').attr('data-page-id')

You can find your element using the *= selector.
let elem = document.querySelector('[class*=page-id-]')
Once you have the element, you can parse the id out:
let [base, id] = elem.className.match(/page-id-(\d+)/)
console.log('page id: %s', id);

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"]')

selecting on dom parser using jquery with relevant class div12 div31 all at one time

Thanks for reading my post..
Just consider the below scenario of html architecture.
<div class="wrapper">
<div class="doubt-123232" id="value"></div>
<div class="question></div>
<div class="doubt-232323" id="query"></div>
</div>
In the above DOM if you need to select the class starting with doubt-***** (which include doubt-123232, doubt-232323) all at a time and do processing using jQuery.
We can select each class one by one and do processing, but in my page I have lot like this . I cant do it for each class to select and do processing then it became a trivial process.
Is there way to select the similar class or id all at time for processing in jQuery?
Thanks.

Yes, you can do this using Attribute Starts With Selector:
var divs = $('div[class^="doubt-"]');

You can use:
var items = $('div[class^=doubt]');
This is known as the "starts with" selector.
Alternatively you could use:
var items = $('div[class*=doubt]');
which is the "contains" selector.
Note that in this case, doubt is one word. If there are multiple words with spaces in between, you should put quotes around them. It is not required to quote single words.
See here for documentation on the "starts with" selector.

You can use Attribute Starts With Selector [name^="value"]
var divs = $('div[class^="doubt-"]');

selecting them all:
var doubts= $('[class^="doubt-"]');
then you access them:
doubts.each(function(index){
this. ... // and so on
});

Try somthing like this:
$("[class^=doubt-]").each(function(){ //do some staff });

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.