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How do I make the active menu item highlighted?

I have a .services section which has a sidebar-menu. How can I make the item I clicked light white and write it into the existing JS code? I tried in the JS code to simply set the addition of css to the color property, but in the end all the items light up
Site http://ct03638.tmweb.ru/
Code jsfiddle.net/p7ubnje6/
$('.sidebar-menu li ').on('click', function(e) {
e.preventDefault()
var index_ = $(this).closest("li").index()
$('.sidebar-menu li').removeClass('big');
$(".sidebar-menu li:eq(" + index_ + ")").addClass('big');
});

Try add style for active link:
.sidebar-menu li.big a {
color: #FFFFFF;
}

On your webiste, you have
.sidebar-menu li a
which has a gray color (#777)
you have to change the color of the "a" tag, since it's "deeper" in the scheme

I would do it like this https://jsfiddle.net/Lmwqadp8/4/
$('.sidebar-menu').on('click', 'li', function () {
$(this).addClass('big').siblings().removeClass('big')
})
If I understand your question correctly

css() doesn't get fired with first click

I'm trying to toggle the css of two buttons in a list. If one is clicked, the other one should have no border, and vice versa. Here's my code:
function navigate_menu(event, ec){
$(event).css("border-top", "3px solid rgba(102,205,0, 0.8)");
var search_id=$(event).attr("name");
var chartid = "pie_chart_"+$(event).attr("name");
var editid = "edit_"+$(event).attr("name");
if(ec=="c"){
$(".li-edit").css("border-top", "0px solid rgba(102,205,0, 0.8)");
$("#"+chartid).appendTo($("#chart_"+search_id+"_container"));
$("#"+editid).css("display","none");
$("#"+chartid).css("display","block");
}else{
$(".li-chart").css("border-top", "0px solid rgba(102,205,0, 0.8)");
$("#"+editid).appendTo($("#chart_"+search_id+"_container"));
$("#"+chartid).css("display","none");
$("#"+editid).css("display","block");
}
}
HTML:
+"<ul id=\"navigation_list\">"
+"<li onclick=\"navigate_menu(this,'c')\" class=\"li-chart\" name=\""+search_id+"\">Chart & Legend</li>"
+"<li onclick=\"navigate_menu(this,'e')\" class=\"li-edit\" name=\""+search_id+"\">Edit Chart\\Change Data</li>"
+"</ul>"
So, when I first click, nothing happens, and then after the second it works. Then when I click on the other button, same (first nothing, second works). I thought that maybe on the first click it thinks I click on the parent (ul), but I don't know how would I fix it. And sorry for the pluses, its because this "menu" gets added to multiple elements from a JS function.
I have also tried addClass() and removeClass(), still same outcome.
Thank you!

Give each a li a shared class, e.g. li-item:
<ul id="navigation_list">
<li onclick="navigate_menu(this,'c')" class="li-chart li-item" name="+search_id+">Chart & Legend</li>
<li onclick="navigate_menu(this,'e')" class="li-edit li-item" name="+search_id">Edit Chart Change Data</li>
</ul>
Then use a JQuery .on("click" function to detect the click and apply the border to the clicked and remove from all others:
$(document).ready(function() {
$(document).on("click", ".li-item", function() {
$(this).addClass("border");
$(".li-item").not($(this)).removeClass("border");
})
})
Make a CSS class with the style to apply:
.border {
border: 2px solid blue;
}
Fiddle: https://jsfiddle.net/w9bwq57m/

Create bordered class in your css. Then call this fn somewhere in your click handler by passing element and second argument (no idea how to name it) I just wrote context. Make sure that you have deleted obsolete staff from the code above , which is responsible for border change .
function toggleBorder(element, context){
if(context === 'c'){
if($(".li-chart").hasClass('bordered')){
$(".li-chart").removeClass('bordered');
}
$(".li-edit").addClass('bordered');
}else{
if($(".li-edit").hasClass('bordered')){
$(".li-edit").removeClass('bordered');
}
$(".li-chart").addClass('bordered');
}
}

I would suggest using jquery click instead of onlick on li elements. Also you'd need to add data-key="c" and data-key="e" to the li elements so those values can be passed to the function:
$("#navigation_list li").click(function () {
navigate_menu(this, $(this).data('key'));
});

Javascript onclick menu change background colors

I have my menu like this:
https://jsfiddle.net/23r4q610/
And my code to change the selected menu button like below:
$('#bluebutton').click(function () {
$('.testul li').removeClass('selectedred selectedpurple selectedgreen selectedorange');
$('#bluebutton').addClass('selectedblue');
});
$('#redbutton').click(function () {
$('.testul li').removeClass('selectedblue selectedpurple selectedgreen selectedorange');
$('#redbutton').addClass('selectedred');
});
$('#purplebutton').click(function () {
$('.testul li').removeClass('selectedblue selectedred selectedgreen selectedorange');
$('#purplebutton').addClass('selectedpurple');
});
$('#greenbutton').click(function () {
$('.testul li').removeClass('selectedblue selectedred selectedpurple selectedorange');
$('#greenbutton').addClass('selectedgreen');
});
$('#orangebutton').click(function () {
$('.testul li').removeClass('selectedblue selectedred selectedpurple selectedgreen ');
$('#orangebutton').addClass('selectedorange');
});
Ofcourse this is bad code since it could be written much shorter. Should I go about this using just numbers so I can do some foreach, or is there a better way to do this?

This can be condensed by adding a generic click event on all buttons by using [id*="button"]. Then grab the relevant color from the nested anchor.
$('[id*="button"]').click(function(){
$('.testul li').removeClass();
$(this).addClass('selected'+$('a',this).attr('class'));
});
or
$('li').click.../*this would be the same as above*/
fiddle

In this particular case, there doesn't appear to be a good reason to add and remove classes. Just change the background color instead of adding and removing a class to do so.
$(this).css("background-color", "red");

I would avoid hard-coding the color names into the HTML IDs. Rather use a CSS class name like "selected" and describe in your CSS what that should look like. Example:
<li id="home-button" class="color-button">Home
CSS:
#home-button.selected,
#home-button:hover {
background: -webkit-linear-gradient(#78b1ff, #4881dc);
}
JS:
$('.color-button').click(function () {
$(this).toggleClass("selected").siblings(".color-button").removeClass("selected");
}
This way color information (presentation) is separated from semantic information (like "home") and JS code is daramtically shorter.
Note: this is just an advice, I have not tested it but should give you a good point to start.

You can reduce the code to only 1 click binding. Where when an element is clicked, class from all the li's is removed and then on the current clicked li, selected class is added.
$(".testul > li").click(function(){
$('.testul li').removeClass('selectedred selectedpurple selectedgreen selectedorange selectedblue');
var color = $(this).attr("id").replace("button","");
$('#'+color+'button').addClass('selected'+color);
});
Here is the updated fiddle - https://jsfiddle.net/23r4q610/2/

How to change CSS pseudo-class element using JavaScript

I want to change this image using javascript:
dance:active { background-image: url("myImage.png") }
You can use
document.getElementById(element).style.backgroundImage = url(image);
to change
#element {background-image: url(image)}
I would like to change the image of when the element is active using javascript. Thanks!

I figured it out!
You can have multiple classes in your CSS :
element.dance1 { stuff }
element.dance1:active { active stuff }
element.dance2 { stuff 2 }
element.dance2:active { active stuff 2 }
and then change the class of the element in javascript:
document.getElementById(element).className = dance1/dance2

You can try using jQuery to achive what you want. dance: active is CSS Pseudo-classes. Learn more about Pseudo-class.
The demo change the div color when mouse down and switch the color back when mouse up. Leave comments if this is not what you want.
$("#dance").on("mousedown", function () {
$("#dance").css("background", "blue");
}).on("mouseup", function(){
$("#dance").css("background", "black");
});
https://jsfiddle.net/x_li/5nkvms8q/
and jQuery can also do the following
$('#damce:checked').val();

jQuery changed ID won't run function

I'm trying to make a blue div that turns red when clicking on it and the red div turns back to blue ( so I can add more events on the click after clicking, so .css isn't really an option)
When clicking on the div when it's blue, it turns red. But when I click the red div it doesn't respond, even when I add a simple alert()
Does anyone know what I'm doing wrong?
This is my current code and a JSFiddle
code:
$("#Blue").click(function(){
$("#Blue").attr("id","Red");
});
$("#Red").click(function(){
$("Red").attr("id","Blue");
});
If anyone could tell me what Exactly I'm doing wrong that would be great, thank you in advance

You need to use event delegation -- your click handlers are bound to the matching elements at the time the code is first run, and only then. Since there's no #Red element at that point in time, that second click handler isn't bound to anything.
$(document).on('click',"#Blue", function(){
$("#Blue").attr("id","Red");
});
$(document).on('click',"#Red", function(){
$("#Red").attr("id","Blue");
});
http://jsfiddle.net/mblase75/HDFyn/
http://api.jquery.com/on
That said, the "proper" way to do this would be to add and remove a class, not change the ID:
$('#btn').on('click', function(){
$(this).toggleClass("red blue");
});
http://jsfiddle.net/mblase75/mKMW6/

.click() binds only to existing elements at the time you call it; it will not bind to a later-created element or an element to which you assign the id later.
The fix is to use event delegation. See here and here for more information.
Also, use classes, instead -- much more flexible.

HTML
<div class="Test blue">Test</div>
jQuery
$(".blue, .red").click(function(){
$(this).toggleClass('red blue')
});
CSS
.Test{
width: 50px;
height: 50px;
}
.blue{
background-color: blue;
}
.red{
background-color: red;
}
Fiddle: http://jsfiddle.net/8FmSt/3/

You could use the class and update the ID like below instead of having 2 function to do that action,
$('.Test').on('click', function () {
this.id = (this.id == 'Blue')?'Red':'Blue';
});
DEMO: http://jsfiddle.net/8FmSt/2/
If it is all about changing color, then use a css to change to color like below,
$('.Test').on('click', function () {
$(this).toggleClass('Red Blue');
});
http://jsfiddle.net/8FmSt/5/

Try:
$(".Test").click(function(){
var id = $(this).attr("id");
if(id == "Red"){
$(this).attr("id","Blue");
}
else{
$(this).attr("id","Red");
}
});
Updated fiddle here.

Let's uncomplicate
HTML
<div class="Test">Test</div>
JQUERY
$(".Test").on('click', function () {
$(this).toggleClass("red");
});
CSS
.Test {
width: 50px;
height: 50px;
background: blue;
}
.red {
background: red;
}