Develop Reference

How to hide div then show another div on click using toggle_visibility

I want show div 1 on html load while hiding div 2, then using onclick I want to exchange their visibility like when clicking button hide div1 then show div2, then when clicking again, hide div2 then show div 1. Here is my code:
function toggle_visibility(id) {
var e = document.getElementById(id);
if(e.style.display == 'none')
e.style.display = 'block';
else
e.style.display = 'none';
}
Hide DIV 1 show DIV 2
<div id="foo"> This is DIV 1</div></div>
<div id="foo"> This is DIV 2</div></div>

Initially set your div1 to display:none; and simply toggle them.
I have used class targetElement just to get rid of common selector. hidden class is used to use the default style display:none; and to replace the inline-style.
I woul like to use button instead of Click here. to do this simple replace a tag with <button type="button"> Button Name </button>
$('#toggleButton').on('click',function(){
$('.targetElement').toggleClass('hidden');
});
.hidden{
display:none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a id="toggleButton" href="#">Click here</a>
<div id="foo" class="targetElement hidden"> This is DIV 1</div></div>
<div id="foo" class="targetElement"> This is DIV 2</div></div>

The attribute id must be unique in a document. Use class instead.
First use CSS to hide the second div. Then use forEach() to hide/show div. You should also avoid using inline event handler.
Try the following way:
document.querySelector('a').addEventListener('click',function(){
[].forEach.call(document.querySelectorAll('.foo'), function(el){
if(el.style.display == 'none')
el.style.display = 'block';
else
el.style.display = 'none';
});
});
Hide DIV 1 show DIV 2
<div class="foo"> This is DIV 1</div></div>
<div class="foo" style="display:none;"> This is DIV 2</div></div>

It is not good practice to have 2 elements with the same ID. ID's should always be unique. Use classes instead. To hide a div onload. Simply add the css to your html element in a style attribute. You also had unecessary </div> tags that I removed.
Here is working code using JQuery (less code) :
$("#toggle").on("click", function() {
$(".isToggable").toggle();
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<a id="toggle" href="#" >Hide DIV 1 show DIV 2</a>
<div class="isToggable"> This is DIV 1</div>
<div class="isToggable" style="display:none"> This is DIV 2</div>
In the html, I added classes to elements that you want to be toggled. I also added an ID to the a tag. In the JQuery I added an event listener onclick on that a tag using it's ID. $(".isToggable").toggle(); takes all the elements with the class "isToggable" in the page toggles their visibility.
With no parameters, the .toggle() method simply toggles the visibility of elements
More information on toggle : JQuery Toggle
Old answer (vanilla javascript)
function toggle_visibility(id) {
var container = document.getElementById(id);
for (var i = 0; i < container.children.length; i++) {
let currentElem = container.children[i];
if (currentElem.style.display === "none") {
currentElem.style.display = "block";
} else {
currentElem.style.display = "none";
}
}
}
Hide DIV 1 show DIV 2
<div id="container">
<div> This is DIV 1</div>
<div style="display:none"> This is DIV 2</div>
</div>
How this works is you put your elements that you want to toggle the visibility inside a container and the toggle_visibility function will toggle all the visibilities of the elements inside. That way if you decide to add more div's they will all be handled.
If you have any questions on how this works. Don't hesitate to ask. Hope it helps !

JS toggle for multiple div elements

What should I do if I have multiple elements in HTML foreach and I need to make them all a toggle slider what opens div block with specific information about the element and I need to add close button too if a user wants to close the div. Sorry, I don't have any code to show because I did not find anything that suits my needs. The main idea is to have a product page with products that are displayed on a page using foreach... Then when you click on a product toggle div block is opened with information about a product. What should I search and what to use, I can't find anything because I am limited with my knowledge. Sorry for terrible English.

You can easily control the visibility of an element either within the div you're clicking or after it using a class you toggle. Here's an example controlling the div after one of the divs that controls the toggle:
document.getElementById("container").addEventListener("click", function(e) {
var toggleDiv = e.target.closest(".toggle");
if (toggleDiv && this.contains(toggleDiv)) {
toggleDiv.classList.toggle("closed");
}
});
.closed + .detail {
display: none;
}
<div id="container">
<div class="toggle closed">Product A</div>
<div class="detail">Details about Product A</div>
<div class="toggle closed">Product B</div>
<div class="detail">Details about Product B</div>
<div class="toggle closed">Product C</div>
<div class="detail">Details about Product C</div>
</div>
The key bits there are:
Hiding the details via CSS with the adjacent sibling combinator (+)
Toggling the class on the toggling div
I used event delegation to hook up the handler, but you could instead hook it up to each individual div if you preferred. Note that the Element#closest method I used is relatively new, you may need a polyfill or a loop on parentNode instead.

From what i have understood.
You need to toggle div elements using button tag and the button u click will show that particular div element.
<div id="container1" class={container1 ? "show" : "hide"}>
container1
</div>
<div id="container2"class={container2 ? "show" : "hide"}>
container2
</div>
<div id="container3"class={container3 ? "show" : "hide"}>
container3
</div>
and three button tags to call toggle function to show the three div element.
<div class="container">
<button name="container1" onclick=(toggle())>Container1</button>
<button name="container2" onclick=(toggle())>Container2</button>
<button name="container3" onclick=(toggle())>Container3</button>
</div>
toggle function
function toggle(e) {
if(e.target.name === 'container1'){
container1 = true;
}
else if(e.target.name === 'container2'){
container2 = true;
}
else if(e.target.name === 'container3'){
container3 = true;
}
}
css part
.show{
display: block;
}
.hide{
display: none;
}

How do I store multiple divs with toggleClass in localStorage?

I'm trying to add localStorage to the toggleClass function in jQuery, so that multiple divs with the .selected css class stay .selected when reloading or closing the browser. The toggleClass seems to work, but I can't seem to get the localStorage to work. What am I doing wrong?
Here's the fiddle.
JS:
$(function(){
$('.mix').click(function() {
window.localStorage.setItem('test',$(this).toggleClass('selected'));
});
if(localStorage.getItem('test')){
$(this).toggleClass('selected');
}
});
HTML:
<div id="box" class="p001 mix">Div 1</div>
<div id="box" class="p002 mix">Div 2</div>
Thanks in advance.

You need to uniquely identify each div element, here in example I have used data-* prefixed custom attributes. On page load you need to iterate the objects and target the elements on which the value of key is set to true
HTML
<div data-id="1" class="p001 mix">Div 1</div>
<div data-id="2" class="p002 mix">Div 2</div>
Script
$(function() {
$('.mix').click(function() {
$(this).toggleClass('selected');
var lsid = 'test' + this.dataset.id;
window.localStorage.setItem(lsid, $(this).hasClass('selected'));
});
$('.mix').each(function() {
var lsid = 'test' + this.dataset.id;
if (localStorage.getItem(lsid) && localStorage.getItem(lsid) == "true") {
$(this).addClass('selected');
}
})
});
Fiddle
Note: Identifiers in HTML must be unique, thus removed id="box" and used CSS based on class

jQuery check divs has a class and unwrap if no other class

I have two div's and what I am trying to do is loop through all the divs to check if the div has a class jsn-bootstrap3, I'm also trying to check to see if the div has any other classes, if it doesn't then I'd like to remove the jsn-bootstrap3 div so that the child content is whats left.
<div class="jsn-bootstrap3">
<div class="wrapper">
Div one
</div>
</div>
<div class="jsn-bootstrap3 block">
<div class="wrapper">
Div two
</div>
</div>
$('div').each(function() {
if ($(this).hasClass()) {
console.log($(this));
var class_name = $(this).attr('jsn-bootstrap3');
console.log(class_name);
}
});
jsFiddle

You can try something like
$('div.jsn-bootstrap3').removeClass('jsn-bootstrap3').filter(function () {
return $.trim(this.className.replace('jsn-bootstrap3', '')) == ''
}).contents().unwrap();
Demo: Fiddle
use the class selector to find div's with class jsn-bootstrap3 because we are not goint to do anything with others
use filter() to filter out div's with any other class
use unwrap() with contents() to remove the wrapping div

targeting a div in an ocean of nested dynamically added divs

I'm using the liferay framework and I need to add a JavaScript detected inline height to a very very specific div in my page. The problem is I need to target it going through an unknown number of dynamically added divs with dynamically added classes and IDs. To complicate this even further, the divs are randomly siblings or nested in each other.
Here's what it looks like:
<div class="known-class">
<div class="unknown dynamicallygenerated"></div>
<div class="unknown dynamicallygenerated">
<div class="unknown dynamicallygenerated">
<div class="unknown dynamicallygenerated"></div>
<div class="unknown dynamicallygenerated">
<div class="DIV-I-WANT-TO-TARGET">this is the div i need to Target with my css/javascript</div>
</div>
</div>
</div>
obviously I can't target it simply with
function resize() {
var heights = window.innerHeight;
jQuery('.DIV-I-WANT-TO-TARGET').css('height', heights + "px");
}
resize();
Because that class is present elsewhere, I would rather target it with something like.
jQuery('.known-class .DIV-I-WANT-TO-TARGET')
Which obviously doesn't work because there's a ton of other divs in the middle and my div is not a child of ".known-class"
I was asking myself if there was any jQuery that could help. Something like:
Catch any div with .DIV-I-WANT-TO-TARGET class that is "generically" inside another div that has .known-class
Is this possible? thanks a lot for your help!

Something like this would work:
// this will target the known-class and find all children with DIV-I-WANT-TO-TARGET
$('div.known-class').find('div.DIV-I-WANT-TO-TARGET');
// this will target the known-class and find the first DIV-I-WANT-TO-TARGET
$('div.known-class').find('div.DIV-I-WANT-TO-TARGET').first();
$('div.known-class').find('div.DIV-I-WANT-TO-TARGET:first');
$('div.known-class').find('div.DIV-I-WANT-TO-TARGET:eq(0)');
$('div.known-class').find('div.DIV-I-WANT-TO-TARGET').eq(0);

You can try in your css file
.known-class div div div div{}
The last div being the DIV-I-WANT-TO-TARGET

Assuming that you are adding the divs starting from the outer to the inner
Assign an equal name plus a number starting from 1
<div class="known-class">
<div class="unknown dynamicallygenerated" id="dynamicdiv1"></div>
<div class="unknown dynamicallygenerated" id="dynamicdiv2">
<div class="unknown dynamicallygenerated" id="dynamicdiv3">
<div class="unknown dynamicallygenerated" id="dynamicdiv4"></div>
<div class="unknown dynamicallygenerated" id="dynamicdiv5">
<div class="DIV-I-WANT-TO-TARGET" id="dynamicdiv6"></div>
</div>
</div>
</div>
The use jQuery [.each][1] to loop through all the divs on the document
$( document.body ).click(function() {
$( "div" ).each(function( i ) {
if ( this.style.color !== "blue" ) {
this.style.color = "blue";
} else {
this.style.color = "";
}
});
});
When you reach the last item in numeric order. (you can use any split function) add the attributes to that div

you need to select last div inside the known-class:
$('.known-class').find('div:last').css('background', 'Red')
OR if you want to select all the .known-class :
$('.known-class').each(function() {$(this).find('div:last').css('background', 'Red')});

Actually your selector works just fine:
$('.known-class .DIV-I-WANT-TO-TARGET')
With a space, selectors will find any descendant.
The search is only limited to direct descendants (immediate children) if you use the > operator.
So $('.known-class > .DIV-I-WANT-TO-TARGET') would not find what you wanted.