Develop Reference

Multiple DIVs with same class with each toggling independently between 2 DIVs

I have multiple divs with the same class (.item) and trying to figure out how to independently toggle between 2 divs (#open and #close).
For example, clicking on "A" or "B" toggles between "Open" and "Close" independently.
I've tried placing "(this)" before (.item), but it results in toggling not working at all.
$(this).on("click", function(event) {
$(event.target).closest(".item").toggleClass("highlight").toggleClass("marked unmarked");
if ($(".item").hasClass('unmarked')) {
$("#open").show();
$("#close").hide();
} else if ($(".item").hasClass('marked')) {
$("#close").show();
$("#open").hide();
} else {
$("#close").hide();
$("#open").hide();
}
});
.item {
text-align: center;
margin: 5px;
padding: 5px;
background: #EEEEEE;
}
.highlight {
background: orange;
}
#open,
#close {
display: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="item marked">A</div>
<div class="item marked">B</div>
<div class="item marked">C</div>
<div id="open">Open</div>
<div id="close">Close</div>

Are you maybe looking for this behaviour?..
$('.item').on('click', function() {
if ($(this).hasClass('highlight')) {
$(this).removeClass('highlight');
$('#open').hide();
$('#close').show();
} else {
$('.item.highlight').removeClass('highlight');
$(this).addClass('highlight');
$('#open').show();
$('#close').hide();
}
})
.item {text-align: center;margin: 5px;padding: 5px;background: #EEEEEE;}
.highlight {background: orange;}
#open, #close {display: none;}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="item">A</div>
<div class="item">B</div>
<div class="item">C</div>
<div id="open">Open</div>
<div id="close">Close</div>
fiddle
https://jsfiddle.net/Hastig/127newyj/

Assuming I'm understanding your question correctly
My recommendation for this scenario is not to rely on the "this" keyword. $(this).on('click'.... is ridiculously broad. It needs to be contained in other code that would allow for a 'this' to be relative.
Instead, get your element by
var my_elemens = getElementsByClassName('item')
and refer to them by
my_elemens[0] // A
my_elemens[1] // B
my_elemens[2] // C
And then for whatever you're wanting to click, use it, so possibly...
$(myelemens[0]).on('click'....

how to make a div disappear/appear on hovering on other div?

How to display the line when I hover over my div circle?
#line {
display: none
}
<div id='circle'>
<div id= 'line'>

Assuming you are using jQuery you can use:
var enterHandler = function(){
$("#line").show();
};
var leaveHandler = function(){
$("#line").hide();
};
$("#circle").hover(enterHandler, leaveHandler);

First thing, with your code, it is not clear if the <div>s are siblings are nested. I will give you the solution for both.
Nested
div {
padding: 10px;
background: #99c;
}
#line {
display: none;
background: #9c9;
}
#circle:hover #line {
display: block;
}
<div id='circle'>
<div id='line'>
</div>
</div>
Siblings
div {
padding: 10px;
background: #99c;
}
#line {
display: none;
background: #9c9;
}
#circle:hover + #line {
display: block;
}
<div id='circle'>
</div>
<div id='line'>
</div>

If you are using jQuery then you can simply try:
$('#circle').on('mouseover', function() {
$('#line').show();
});
$('#circle').on('mouseleave', function() {
$('#line').hide();
});

jQuery would be simplest.
$('#circle').hover(function(){
$('#line').css('display','inline');
});
or whatever display property you are going for.

Try this in script tag and use onmouseover and onmouseout events
<script>
function hidediv() {
document.getElementById('line').style.display = 'none';
}
function showdiv() {
document.getElementById('line').style.display = 'block';
}
</script>
<div id='circle' onmouseover="hidediv();" onmouseout="showdiv();" > this is circle
<div id= 'line'>this is line
</div>
</div>

jQuery | detach(), append() scope

I have a main-div and two divs with the class of container. The div with the class of container has a child div with a class of content with different contents. I'd like for the user to click on their choice of containers and transport its content to main-div. Then when the user clicks on the main-div, I'd like to transport that content back to its original div.
I'm not sure how to detach the content from main-div once it's been passed and reinsert it back into its original parent. I would appreciate any help.
I can't use IDs. I can only uses classes.
HTML
<div class="main-div">
</div>
<div class="container">
<div class="contents">
A
</div>
</div>
<div class="container">
<div class="contents">
B
</div>
</div>
CSS
.main-div {
width: 100wv;
height: 200px;
background: yellow;
cursor: pointer;
}
.container {
width: 40vw;
height: 150px;
border: 2px solid purple;
display: inline-block;
}
.contents {
width: 50px;
height: 50px;
background: green;
}
JS
$('.container').click(function() {
var child = $(this).children();
console.log('child ' + child);
$('.main-div').append(child);
});
$('.main-div').click(function(child) {
console.log('child ' + child);
$('.main-div').detach(child);
});
FIDDLE

Set ids for the containers
<div class="main-div">
</div>
<div class="container" id="container1">
<div class="contents">
A
</div>
</div>
<div class="container" id="container2">
<div class="contents">
B
</div>
</div>
And set a data attribute for the children on click to identify the parent element.
$(function() {
$('.container').click(function() {
var child = $(this).children();
child.attr("data-parentcontainer", this.id);
$('.main-div').append(child);
});
$('.main-div').click(function(child) {
var child = $(this).children();
child.appendTo($("#" + child.data("parentcontainer")));
});
});
JSFIDDLE

Use this JS snippet and let me know if it helps
$('.container').click(function() {
console.log('foo');
var child = $(this).html();
console.log(child);
$('.main-div').append(child);
});
$('.main-div').click(function() {
console.log('foo');
var main = $(this).html();
if(main.length != 0) {
$('.main-div').empty();
}
else
console.log('Main div is empty');
});

External DEMO
You can use .detach() and .appendTo(), but along with that you have to keep some identification to know from that .contents div was picked up. So I am making use of data-address attribute for the parent of picked .contents so as to attach it back there. See inline comments for detailed explanation on what will happen with the code.
$('.main-div').on('click', function(e) {
var elem = $(e.target); //capture click event on .main-div
if (elem.hasClass('contents')) { //check if click was on .contents div
var text = elem.text().trim(); //if yes then get its text
elem.detach();//detach the element
elem.appendTo($('div[data-address=' + text + ']')); //attach it based on attribute selector of jquery
}
});
$('.contents').on('click', function() {
var elem = $(this);//get the element
elem.closest('.container').attr('data-address', elem.text().trim())
//add or update data-address attribute of its closest parent i.e. .container
elem.detach();//detach the element
elem.appendTo($('.main-div')); //append it to .main-div
})
.main-div {
width: 200px;
height: 200px;
background: yellow;
cursor: pointer;
}
.container {
width: 150px;
height: 150px;
border: 2px solid purple;
}
.contents {
width: 50px;
height: 50px;
background: green;
position: relative;
padding: 10px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="main-div">
</div>
<div class="container">
<div class="contents">
A
</div>
</div>
<div class="container">
<div class="contents">
B
</div>
</div>

You need to add some uniqueness on the div that have class container, you can add a class or id so that when reinserting back to the original div we can identify the div.
i don't think is there other solution to reinsert back to the original div, whenever we identify both div uniquely.
please change your html structure so that we can manipulate through jquery.

jQuery hide if either div is visible

I have 2 divs that are initially hidden
<div id="whistle" style="display:none;">
<div id="lean" style="display:none;">
I also have a div that is visible
<div id="me" style="display:block">
I have jQuery code that allows only the #whistle or #lean divs to be open at once, their buttons will hide the other.
I currently have code that also hides the #me div, but I would now like the #me div to open back up when both #whistle and #lean are closed.
If you want to see the site, the link is maxdev.tk
The jQuery code is
$(document).ready(function(){
$("#calc").click(function(){
$("#whistle").hide(600);
$("#lean").toggle(900);
});
});
$(document).ready(function(){
$("#whi").click(function(){
$("#lean").hide(600);
$("#whistle").toggle(900);
});
});

This is one way to solve it. Find it also as a pen at the end of this post.
$(document).ready(function() {
function callback() {
if( $('#whistle').hasClass('hidden') && $('#lean').hasClass('hidden') ) {
$('#me').removeClass('hidden');
} else {
$('#me').addClass('hidden');
}
}
$('button[data-for=whistle]').on('click', function() {
$('#whistle').toggleClass('hidden');
$('#lean').addClass('hidden');
callback();
});
$('button[data-for=lean]').on('click', function() {
$('#lean').toggleClass('hidden');
$('#whistle').addClass('hidden');
callback();
});
})
.hidden {
opacity: 0;
height: 0;
overflow: hidden;
padding: 0;
}
div {
background-color: #ccc;
border-radius: 25px;
margin-top: 20px;
padding: 50px;
text-align: center;
transition-duration: 0.4s;
width: 50%;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<button data-for="whistle">Whistle</button>
<button data-for="lean">Lean</button>
<div id="whistle" class="hidden">Whistle!</div>
<div id="lean" class="hidden">Lean!</div>
<div id="me">Me!</div>
http://codepen.io/anon/pen/yNJrwe

Add this code to the end of whatever buttons' click function.
if( !$('#whistle').is(':visible') && !$('#lean').is(':visible') ) {
$('#me').css("display","block"); // or use .show();
} else {
$('#me').css("display","none"); // or use .hide();
}

Second toggel should be close when i click back to the first toggle

I have tow toggles. I want appear only one toggle at the time. When i click to second toggle then first toggle should be close.
Javascript
$('#bar').click(function () {
$('#foo').slideToggle('slow');
});
$('#bar1').click(function () {
$('#foo1').slideToggle('slow');
});
HTML
<button id="bar">bar</button>
<div id="foo"></div>
<button id="bar1">bar1</button>
<div id="foo1"></div>
CSS
#foo {
width: 100px;
height: 100px;
background-color: green;
display:none;
}
#foo1 {
width: 100px;
height: 100px;
background-color: green;
display:none;
}
jsfiddle

You can use classes instead of id's
$('.bar').click(function () {
$('.foo').hide(); // hide previous elements
$(this).next().show('slow'); // show next element in the DOM (it will be <div> with class 'foo')
});
Example

I did what you want with classes,
the accordion style,
$('#bar, #bar1').click(function () {
var id = '#'+$(this).attr('data-for');
if ($(id).hasClass('open')) {
$(id).toggleClass('open');
}
else if ($('#foo').hasClass('open') || $('#foo1').hasClass('open')) {
$('#foo').toggleClass('open');
$('#foo1').toggleClass('open');
}
else {
$(id).toggleClass('open');
}
});
#foo {
width: 100px;
height: 0;
background-color: green;
display:block;
transition: all .5s;
}
#foo1 {
width: 100px;
height: 0;
background-color: green;
display:block;
transition: all .5s;
}
#foo.open, #foo1.open {
height: 100px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="bar" data-for="foo">bar</button>
<div id="foo"></div>
<button id="bar1" data-for="foo1">bar1</button>
<div id="foo1"></div>

hi i have two ways which you can achive it
in this case the first div is sliding up when second div is opening
$('#bar').click(function () {
$("div").slideUp("slow");
$('#foo').slideToggle('slow');
});
$('#bar1').click(function () {
$("div").slideUp("slow");
$('#foo1').slideToggle('slow');
});
case 1 in fiddler
in second case am hiding the first div when am opening the second div
$('#bar').click(function () {
$("div").hide();
$('#foo').slideToggle('slow');
});
$('#bar1').click(function () {
$("div").hide();
$('#foo1').slideToggle('slow');
});
case 2 in fiddler
i hope my answer helps you :)