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If statement only checks variable value once in javascript

I am trying to understand how javascript (jquery in this case) if statements work. I thought i understood but i don't fully get some things. Please see the code below. Why is it when i click on the element with the class of "cat" that it does not remove the class of "black" and add the class of "red".
$(function() {
var cat = true;
$( ".cat" ).click(function() {
cat = false;
});
if (cat === true) {
$('.cat').removeClass('red').addClass('black');
} else {
$('.cat').removeClass('black').addClass('red');
}
});
i know there is probably a very simple answer to this but i'm just learning so any help would be appreciated, thanks in advance.

Toggle the value of cat and put the if block inside the function that you want to bind with the event 'click':
$(".cat").click(function() {
cat = !cat;
if (cat === true) {
$('.cat').removeClass('red').addClass('black');
} else {
$('.cat').removeClass('black').addClass('red');
}
});
Edit: Simpler way to do this is to use .toggleClass():
$(".cat").click(function() {
$(this).toggleClass('red black');
});

If you want to check on click, put the if inside the click event. The reason why your solution doesn't work is because you attach a listener to the element, but you immediately do a check. The check doesn't happen every time the user clicks, just once. You must put it in the listener's callback function so it executes every time the element is clicked:
$(function() {
$(".cat").click(function() {
$(".cat").toggleClass("black red");
});
});
How this works is it attaches a click event to .cat and, on click, toggles the classes black and red. This completely gets rid of the checking because that isn't necessary. Just toggle the classes on click. Also, no need to repeat the selector, just use this. Here's a snippet:
$(function() {
$(".cat").click(function() {
$(this).toggleClass("black red");
});
});
.black {
color: black;
}
.red {
color: red;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="cat red">Test</div>

Your code is not removing class black and adding class red because your if(){}else{} code block running when your page is loading. When you are clicking the cat class it is only assigning the value of cat variable to false. since your if else code block is out of your click function that is why it is not executing again. and that is why it is not working. To work your code place your if else code block in the click function like this:
$( ".cat" ).click(function() {
cat = false;
if (cat === true) {
$('.cat').removeClass('red').addClass('black');
} else {
$('.cat').removeClass('black').addClass('red');
};
});

Chaining multiple Jquery events with OR operator

I'm creating a panel that slides down when the user focuses the search box.
I'm terrible at Jquery but still learning, I've managed to create the basic functionality:
$(document).ready(function() {
$(".search-panel").hide();
$("#search_form [type='text']")
.focus(function() {
$(".search-panel").slideDown("fast");
})
.focusout(function() {
$(".search-panel").slideUp("fast");
});
});
with this basic functionality clicking outside the text box will fold up the panel I'm trying to implement a complex set of conditions whereby:
IF (textbox.focus) { show search panel}
IF (texbox.losefocus) && ( NOT search-panel.mouseover)
&& ( NOT (anything-in-search-panel-is-focused) )
basically I need to make sure that the user is not hovering over or interacting with the panel in some way and that the textbox is not focused before I slide it up.
JsFiddle of current situation:
http://jsfiddle.net/b9g9d6gf/

Instead of using the .focusout() function, you should bind a click function on the document.
$(document).ready(function () {
$(".search-panel").hide();
$("#search_form [type='text']")
.focus(function () {
$(".search-panel").slideDown("fast");
});
$(document).click(function(e) {
if( !( $(e.target).is('#search_form *')) ){
$(".search-panel").slideUp("fast");
}
});
});
If the document is clicked, anywhere, it looks if the target isn't a element inside #search_form. If not, it will slide up the .search-panel.
Note:
I removed the label and changed the span to labels. Clicking a label will also (un)check the checkbox inside it. Having three checkboxes making it act wrong. So either make three separate labels (instead of span) or remove it.
Updated Fiddle

Try this Working Demo
<script>
$(document).mouseup(function (e)
{
var container = $("#search_form");
if (!container.is(e.target) // if the target of the click isn't the container...
&& container.has(e.target).length === 0) // ... nor a descendant of the container
{
$(".search-panel").slideUp("fast");
}
else
{
$(".search-panel").slideDown("fast");
$("#search_form [type='text']").focus();
}
});
</script>

How to control check element from jquery dropdown button

I've used this jQuery dropdown button. This is my fiddle. This is the step of this:
So, the functionality:
At the time of selecting one option, a new box will appearing containing the title of that option. For example, if you click on the "Low" on the dropdown, a new box will come containing text, "Low" with a cross button.
I've written the script like this:
$('.low-option input[type=checkbox]').change(function(){
if($(this).prop('checked')){
$('#low-box').show();
} else {
$('#low-box').hide();
}
});
If you remove the boxes by clicking cross button, the box will be removed and adjacent checkbox will be unchecked.
So, I wrote this:
$('.option-box').on('click', '.cross', function() {
$(this).parent().remove();
});
if($('#low-box').is(":hidden")) {
$('.low-option input[type=checkbox]').prop('checked', false);
}
div.option-content is hidden at first. If any div.option-box will be visible, div.option-content will be visible too. If there is no div.option-box visible, div.option-content will be hidden always.
To do this, I wrote this:
var count = $('.option-content .option-box').is(":visible").length;
if (count > 0){
$('.option-content').show();
} else{
$('.option-content').hide();
}
But, my script is not working properly. As, I am not very good at jQuery, I can't find the reason and can't make it right way. Can you please help me removing the problem in the script?

Here I rewrite your code so it will become more scalable.. The important part that you missed is to relate/connect the checkbox with your option-box, so it will be easier for you to hide or show related element.. Check out this working Fiddle.
$('.dropdown-menu input[type=checkbox]').change(function(){
if($(this).prop('checked')){
$('.option-content').show();
$('.option-content #'+$(this).prop('id')).show();
} else {
$('.option-content #'+$(this).prop('id')).hide();
if($('.option-content .option-box:visible').length == 0){
$('.option-content').hide();
}
}
});
$('.option-box').on('click', '.cross', function() {
$('.dropdown-menu #'+$(this).parent().prop('id')).prop('checked', false);
$(this).parent().remove()
if($('.option-content .option-box:visible').length == 0){
$('.option-content').hide();
}
});
Cheers..

how to hide submenu after click

I'm creating a dropdown menu for mobile site
http://gthost.dyndns.org/kudu/en/
when I click on My Account and click on Who we are, submenu still show,,
I Want to hide it after I click on the link.
this is JavaScript code
var $j = jQuery.noConflict();
$j(document).ready(function () {
$j(".account").click(function () {
var X = $j(this).attr('id');
if (X == 1) {
$j(".submenu").hide();
$j(this).attr('id', '0');
} else {
$j(".submenu").show();
$j(this).attr('id', '1');
}
});
//Mouseup textarea false
$j(".submenu").mouseup(function () {
return false
});
$j(".account").mouseup(function () {
return false
});
//Textarea without editing.
$j(document).mouseup(function () {
$j(".submenu").hide();
$j(".account").attr('id', '');
});
});

i would try using:
$('.submenu').css({display:"none"});
instead of .hide();

Two things strike me as odd here.
Why are your ID's integers - valid names start with [a-z_] etc.
Why are you changing the ID? An ID is meant to be a unique identifier and should persist as long as the element does. If you wish to store information about the state of an element within the element itself, then perhaps look into data attributes.
Without seeing your HTML structure everyone is going to be guessing but rather than whatever you are trying to do with the ID's it looks like you could logically use jQuery.toggle:
$j(".account").click(function(){
$j(".submenu").toggle();
});

jquery conditional logic for currentpage

I'm using jQuery for a vertical site navigation menu, all links within site. I have the basic functionality working, but am at a loss as to the correct if-else to accomplish the following:
As the code stands, the submenu items are always initially hidden, but I want them to start shown if the user-selected li or one of its child lis is assigned the class currentpage.
The code as it stands is:
(function(){
$('li:has(ul)')
.click(function(event){
if (this == event.target || $(event.target).parent()[0] == this) {
if ($(this).children('ul').is(':hidden')) {
$(this)
.css('list-style-image','url(minus.gif)')
.children('ul').slideDown();
}
else {
$(this)
.css('list-style-image','url(plus.gif)')
.children('ul').slideUp();
}
}
})
.css({
cursor:'pointer',
'list-style-image':'url(plus.gif)'
})
.children('ul').hide();
$('li:not(:has(ul))').css({
cursor: 'default',
'list-style-image':'none'
});
});
Hopefully someone can put me on the right track.
Bob McLeod

I want them to start shown if the user-selected li or one of its child lis is assigned the class currentpage.
How about afterwards doing:
$('.currentpage').parents('ul').show();

I would make a showMenuItem() function and call it in both places where you want to show a menu item.
$(function() { $('.currentpage').each(function() {
if ($(this).parents().filter('ul').is(":hidden")) {
showMenuItem($(this).parents().filter('ul'));
} else {
showMenuItem(this);
}
}});