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How can I close layer popup when I click background or button?

The scenario is as follows.
Default Status (no layer popup)
When I click the button, layer popup shows.
Click the button or outside, layer popup will be hide.
I want to close the layer popup when I click background(outside) or button.
How can I do with Vanilla JS or jquery? (based on HTML)
I would appreciate it if you could answer.

When you open the popup attach a click listener to body that closes it and removes the listener.

You can use this code
//use by id
document.getElementById(#id).style.display = 'block';
document.getElementById(#id).style.display = 'none';
//use by className
document.getElementById(.className).style.display = 'none';
document.getElementById(.className).style.display = 'block';
or use jQuery
$(document).ready(function(){
$("#id").click(function(event){
// $("#id").toggle();
// $("#id").hide();
// $("#id").show();
});
});

Set id for your layer in HTML part like id="layerPopup"
Then on your JS code create event for your button
$(document).on('click', '#btnId', function(){
$("#layerPopup").hide();
});

You should appear a overlay which will cover the whole body, and give it css property z-index to lower from the button, and when apply click function on it same as my code
HTML
<div class="overlay"></div>
CSS
.overlay{
background-color: transparent;
inset: 0;
position: fixed;
z-index: 100;
display: none;
}
button{
z-index: 101;
}
JQuery
$('button').click(function(){
$('.overlay, popup').toggle();
});
$('.overlay').click(function(){
$('.overlay, popup').hide();
});

One standard way to handle such scenario is to have a backdrop div behind the popup and then add an event listener to it. You may choose to change backdrop's background color to increase pop up aesthetics visibly.
.backdrop {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100vh;
z-index: 10;
background: rgba(0, 0, 0, 0.75);
}
.modal {
position: fixed;
top: 30vh;
left: 10%;
width: 80%;
z-index: 100;
overflow: hidden;
}
<div class="backdrop" />
<div class="modal" />
And then you can add an event listener on backdrop:
$(document).on('click', '.backdrop', function(){
$(".modal").hide();
});
PS: There may be some syntax issues!

Javascript - Reversing a Modal Animation

I have a few items on a site I'm building that onclick activate a modal like this.
Right now the animation is a one-way in that, when you close it or click off from the modal's focus, it just disappears. From what I've been reading, people seems to use the fadeIn/slideIn animation for one time effects, but is it possible, to reverse the animation so instead of just changing display to none, it slides back out?

#modal{bottom: 0; opacity: 1; transition: bottom 400ms, opacity 400ms; }
#modal.hidden{bottom: -300px; opacity: 0}
Then in button click event:
$("#modal").addClass("hidden")
On close event:
$("#modal").removeClass("hidden")
If you need pure javascript, it would be a bit more code but essentially that's it

Depending on how you've structured your code, you can approach this in a few ways:
Make use of the animation-direction: reverse; CSS property
Use a Javascript framework (like jQuery) that enables manipulation of DOM elements (with jQuery you could do something like: $('element').slideIn(); to show the modal and $('element').slideOut(); to hide the modal).
Use CSS classes and apply / unapply them with Javascript (the option I'd recommend, and have given an example below):
$(document).ready(function() {
$('.open').on('click', function(e) {
e.preventDefault();
if ($('.modal').hasClass('hide')) {
$('.modal').removeClass('hide');
}
$('.modal').addClass('show');
});
$('.close').on('click', function(e) {
e.preventDefault();
$('.modal').addClass('hide');
if ($('.modal').hasClass('show')) {
$('.modal').removeClass('show');
}
});
});
.modal {
position: fixed;
top: 0;
left: 0;
width: 300px;
height: 300px;
left: -305px;
z-index: 999;
transition: all 0.3s ease;
background: #ffffff;
border: 1px solid blue;
}
.modal.show {
left: 150px;
}
.modal.hide {
left: -305px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>Click here to open modal</p>
<div class="modal">
<p>This is a modal window.</p>
<p>Click here to close</p>
</div>
Please note that this example is only there to illustrate a proof of concept - you'll need to tidy it yourself :)

How to get this kind of web page effect

The little popup window appears in the middle of the original page.
The original page is covered by grey shade if not by the popup window.
The underneath original page can still be scrolled up and down.

Follow these steps:
1) Create this CSS rule:
.overlay {
width: 100%;
height: 100%;
position: fixed;
top: 0;
left: 0;
opacity: 0.5;
background: #666;
filter: alpha(opacity=50); /* opacity for IE browsers */
}
2) Add this code to your jQuery:
$("body").prepend("<div class='overlay'></div>");
3) When done, remove it like this:
$(".overlay").remove();
Didn't test this, but it should work (maybe with very minor modifications). This is one way, if you prefer doing it by yourself. You can, however, use existing solutions such as Twitter's Bootstrap lib which is cool, and I recommend it.
http://twitter.github.com/bootstrap/
Regards.

You could use the JQueryUI dialog widget http://jqueryui.com/dialog/#modal

This is easy enough to achieve with some simple CSS...
The overlay (the grey background) is fixed in place and covers everything below:
#overlay {
display: none;
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: #000;
opacity: 0;
filter: alpha(opacity=0);
z-index: 2; // above content
}
The "dialog" itself is similar in style, but smaller:
#dialog {
display: none;
position: fixed;
width: 500px;
height: 250px;
background-color: #fff;
z-index: 3; // above 'overlay'
}
The top and left attributes can be calculated with simple JavaScript, so that the dialog can be positioned in the center of the browser:
positionDialog = function() {
if (typeof window.innerHeight != 'undefined') {
dialog.top = parseInt(window.innerHeight / 2) - dialog.height;
dialog.left = parseInt(window.innerWidth / 2) - dialog.height;
}
}
And also upon window resize:
$(window).resize(function() {
positionDialog();
}
Notice how the CSS sets these DIVs to display: none. They are hidden until called, which is done by setting them to display: block.
These days, I find that it's much simpler and more robust to rely on jQuery UI's excellent dialog widget.

It's called a light box. There's a way that you can do it using only CSS:
http://www.emanueleferonato.com/2007/08/22/create-a-lightbox-effect-only-with-css-no-javascript-needed/
The key for darkening the background is the CSS opacity property of a box that you cover the background with, which you can set a black background and use this CSS for transparency:
-moz-opacity: 0.8;
opacity:.80;

You could take a look at the modal included in Twitter Bootstrap: http://twitter.github.com/bootstrap/javascript.html#modals

How do I make a div full screen?

I am using Flot to graph some of my data and I was thinking it would be great to make this graph appear fullscreen (occupy full space on the monitor) upon clicking on a button. Currently, my div is as follows:
<div id="placeholder" style="width:800px;height:600px"></div>
Of course, the style attribute is only for testing. I will move this to CSS after during the actual design. Is there anyway I could make this div fullscreen and still preserve all event handling?

You can use HTML5 Fullscreen API for this (which is the most suitable way i think).
The fullscreen has to be triggered via a user event (click, keypress) otherwise it won't work.
Here is a button which makes the div fullscreen on click. And in fullscreen mode, the button click will exit fullscreen mode.
$('#toggle_fullscreen').on('click', function(){
// if already full screen; exit
// else go fullscreen
if (document.fullscreenElement) {
document.exitFullscreen();
} else {
$('#container').get(0).requestFullscreen();
}
});
#container{
border:1px solid red;
border-radius: .5em;
padding:10px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="container">
<p>
Toggle Fullscreen
</p>
I will be fullscreen, yay!
</div>
Please also note that Fullscreen API for Chrome does not work in non-secure pages. See https://sites.google.com/a/chromium.org/dev/Home/chromium-security/deprecating-powerful-features-on-insecure-origins for more details.
Another thing to note is the :fullscreen CSS selector. You can append this to any css selector so the that the rules will be applied when that element is fullscreen:
#container:fullscreen {
width: 100vw;
height: 100vh;
}

When you say "full-screen", do you mean like full-screen for the computer, or for taking up the entire space in the browser?
You can't force the user into full-screen F11; however, you can make your div full screen by using the following CSS
div {width: 100%; height: 100%;}
This will of course assume your div is child of the <body> tag. Otherwise, you'd need to add the following in addition to the above code.
div {position: absolute; top: 0; left: 0;}

CSS way:
#foo {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
}
JS way:
$(function() {
function abso() {
$('#foo').css({
position: 'absolute',
width: $(window).width(),
height: $(window).height()
});
}
$(window).resize(function() {
abso();
});
abso();
});

For fullscreen of browser rendering area there is a simple solution supported by all modern browsers.
div#placeholder {
height: 100vh;
}
The only notable exception is the Android below 4.3 - but ofc only in the system browser/webview element (Chrome works ok).
Browser support chart: http://caniuse.com/viewport-units
For fullscreen of monitor please use HTML5 Fullscreen API

.widget-HomePageSlider .slider-loader-hide {
position: fixed;
top: 0px;
left: 0px;
width: 100%;
height: 100%;
z-index: 10000;
background: white;
}

Can use FullScreen API like this
function toggleFullscreen() {
let elem = document.querySelector('#demo-video');
if (!document.fullscreenElement) {
elem.requestFullscreen().catch(err => {
alert(`Error attempting to enable full-screen mode: ${err.message} (${err.name})`);
});
} else {
document.exitFullscreen();
}
}
Demo
const elem = document.querySelector('#park-pic');
elem.addEventListener("click", function(e) {
toggleFullScreen();
}, false);
function toggleFullScreen() {
if (!document.fullscreenElement) {
elem.requestFullscreen().catch(err => {
alert(`Error attempting to enable full-screen mode: ${err.message} (${err.name})`);
});
} else {
document.exitFullscreen();
}
}
#container{
border:1px solid #aaa;
padding:10px;
}
#park-pic {
width: 100%;
max-height: 70vh;
}
<div id="container">
<p>
Toggle Fullscreen
</p>
<img id="park-pic"
src="https://storage.coverr.co/posters/Skate-park"></video>
</div>
P.S: Using screenfull.js nowadays. A simple wrapper for cross-browser usage of the JavaScript Fullscreen API.

This is the simplest one.
#divid {
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
}

u can try this..
<div id="placeholder" style="width:auto;height:auto"></div>
width and height depends on your flot or graph..
hope u want this...
or
By clicking, u can use this by jquery
$("#placeholder").css("width", $(window).width());
$("#placeholder").css("height", $(window).height());

Use document height if you want to show it beyond the visible area of browser(scrollable area).
CSS Portion
#foo {
position:absolute;
top:0;
left:0;
}
JQuery Portion
$(document).ready(function() {
$('#foo').css({
width: $(document).width(),
height: $(document).height()
});
});

<div id="placeholder" style="position:absolute; top:0; right:0; bottom:0; left:0;"></div>

With Bootstrap 5.0 this is incredibly easy now. Just toggle these classes on and off the full screen element.
w-100 h-100 position-absolute top-0 start-0 bg-white

jQuery dialog that darkens the screen like the link dialog does here

I like the look of the link dialog here. It darkens the screen and is probably modal (although I haven't tested that I just assume it is). What's a quick and easy way of darkening the screen like that witha jQuery UI Dialog?

The functionality you're talking about is provided by the WYSIWYM Markdown Editor
To do it with jQuery UI's dialog, try this:
$("#something").dialog({ modal: true; });
<div id="something" title="modal dialog">
<p>Add your stuff here.</p>
</div>
It's not exactly the same by default, but I think it's even prettier. ;)
http://ui.jquery.com/demos/dialog/#modal

One way to do it is to have a div at z-order > 1 which covers the whole screen at less than 100% opacity
HTML:
<div id="cover> </div>
CSS:
#cover {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
z-index: 10;
display: none;
background-color: #000000;
opacity: .7;
filter:progid:DXImageTransform.Microsoft.BasicImage(opacity=.7);
}
Then you can show the cover when you show your dialog, which needs to be at a yet higher z-index and remove the cover at the same time as your dialog:
Open:
$("#cover").show();
$("#fileupload").show( "slow" );
Close:
$("#fileupload").fadeOut( "slow" );
$("#cover").hide();