Develop Reference

I'm trying to open side panels with overlay and close

I'm trying to code my own Shopify theme and in that, I want to create different side panels (all coming in from the right) when someone clicks the panel link. I managed to get this to work with one panel and a script I found here on Stackoverflow (sorry I'm a complete newbie), but now I can't open different panels. Each link opens them all (obvious) but couldn't manage to trigger by the ID (my guess how to solve it) rather than the classes.
I would also like the overlay to close the panels. I only manage this by adding the toggle button into each panel.
My sidepanel script
<script>
$(document).ready(function() {
function toggleSidebar() {
$(".sidepanel-toggle").toggleClass("active");
$(".overlay").toggleClass("active");
$(".sidepanel").toggleClass("active");
$("body").toggleClass("activeoverlay");
}
$(".sidepanel-toggle").on("click tap", function() {
toggleSidebar();
});
$(document).keyup(function(e) {
if (e.keyCode === 27) {
toggleSidebar();
}
});
});
</script>
And the HTML for handling the panels
meta data
<aside id="extra_prod_meta" class="sidepanel">
meta data
</aside>
Brand
<aside id="extra_prod_brand" class="sidepanel">
meta data
</aside>

$body = $('body');
$('a.sidepanel-toggle').on('click', function(e) {
e.preventDefault();
let _this = $(this),
tg = _this.data('panel');
addActivePanel(tg,_this);
});
$('.close, .overlay').on('click', function(){
removeActivePanel();
});
function removeActivePanel(){
$body.removeClass('activeoverlay');
$('a.sidepanel-toggle, aside').removeClass('active');
}
function addActivePanel(panel,btn) {
$body.addClass('activeoverlay');
$('#'+panel).addClass('active');
btn.addClass('active');
}
aside {
box-sizing: border-box;
width: 200px;
height: 100%;
position: fixed;
top: 0;
right: -200px;
padding: 1rem;
background: #000;
color: #fff;
z-index: 2;
transition: right .3s ease;
}
aside.active {
right: 0;
}
.overlay {
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
background: rgba(0,0,0,.2);
z-index: -1;
display: none;
}
.activeoverlay .overlay {
display: block;
z-index: 1;
}
.close {
text-align: right;
cursor: pointer;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
meta data
<div class="overlay"></div>
<aside id="extra_prod_meta" class="sidepanel">
<div class="close">X</div>
meta data extra_prod_meta
</aside>
Brand
<aside id="extra_prod_brand" class="sidepanel">
<div class="close">X</div>
meta data extra_prod_brand
</aside>
You could use data-attributes and target the correct panel.
$('a.sidepanel-toggle').on('click', function(e) {
e.preventDefault();
let _this = $(this),
tg = _this.data('panel');
$('#'+tg).addClass('active');
})
.active {
background: red;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
meta data
<aside id="extra_prod_meta" class="sidepanel">
meta data
</aside>
Brand
<aside id="extra_prod_brand" class="sidepanel">
meta data
</aside>

how to make a div grow to cover a paragraph in javascript with transition?

I am trying to make a transition with a div that should grow and overlap a text.
Here are my codes
const box = document.querySelector("#box");
const mybutt = document.querySelector("#mybutt");
mybutt.addEventListener("click", transitionfunction);
function transitionfunction() {
if(box.style.height != "100px"){
box.style.height = "100px";
box.style.transition = "2s";
}
else {
box.style.height = "50px";
box.style.transition = "2s";
}
}
#box {
background: red;
height: 50px;
width: 50px;
}
#para {
postion: fixed;
}
<div id="parentdiv">
<div id="box"></div>
<p id="para">Help</p>
</div>
<button id="mybutt">click</button>
At the moment, on the click of the button, both the button and the paragraph para move down, I want them to be fixed and I want the div, #box to cover the para but its not working. I tried putting it to fixed but doesnt work. And on the click on the button again, it should reveal the text again.

If you use position: fixed;, you should manually set the top property.
To make a div overlay some text, use z-index
const box = document.querySelector("#box");
const mybutt = document.querySelector("#mybutt");
mybutt.addEventListener("click", transitionfunction);
function transitionfunction() {
if (box.style.height != "100px"){
box.style.height = "100px";
box.style.transition = "2s";
} else {
box.style.height = "50px";
box.style.transition = "2s";
}
}
#mybutt {
position: fixed;
top: 120px;
}
#box {
background: red;
position: fixed;
height: 50px;
width: 50px;
z-index: 2;
}
#para {
position: fixed;
z-index: 1;
top: 60px;
}
<div id="parentdiv">
<div id="box"></div>
<p id="para">Help</p>
</div>
<button id="mybutt">click</button>

Firstly, you spelled "position" wrong for #para. Change it to:
#para {
position: absolute;
top: 10%;
}
This will keep the paragraph positioned in one spot; it won't move.

Fixed will work, although you might want to use 'absolute' instead if you want it to anchored to it's parent instead of the window itself.
Also, 'position' is misspelled; not sure if it is in your testing code.
The 'top' property has to be set for the element to know where to anchor itself, the 'position' property is what to anchor to.
HTML
<div id="parentdiv">
<div id="box"></div>
<p id="para">Help</p>
</div>
</div>
<button id="mybutt">click</button>
CSS
<style>
#box {
background: red;
height: 50px;
width: 50px;
}
#para {
position: absolute;
top:70;
}
</style>
*You also might want to move '#para' outside '#parentdiv', but it depends what you'll trying to ultimately do, it does work inside too.
Added:
To include an alert at 75px, you have to use a function that gives you more granular control(as far as I know at least). This is one solution:
<script>
const box = document.querySelector("#box");
const mybutt = document.querySelector("#mybutt");
mybutt.addEventListener("click", transitionfunction);
var intHeight = $("#box").css("height").split("p")[0];
function transitionfunction() {
if(intHeight < 100) {
intHeight++;
$("#box").css("height", intHeight + "px");
if (intHeight===76)
alert("75px!")
requestAnimationFrame(transitionfunction);
}
intHeight = $("#box").css("height").split("p")[0];
mybutt.addEventListener("click", revtransitionfunction);
mybutt.removeEventListener("click", transitionfunction);
}
function revtransitionfunction() {
if(intHeight >= 50) {
intHeight--;
$("#box").css("height", intHeight + "px");
if (intHeight===74)
alert("75px!")
requestAnimationFrame(revtransitionfunction);
}
intHeight = $("#box").css("height").split("p")[0];
mybutt.addEventListener("click", transitionfunction);
mybutt.removeEventListener("click", revtransitionfunction);
}

Adding touchEvents for navigation

I'm building a little site with full page horizontal and vertical scrolling. Check out a codepen demo here. There is a bug with the demo, the 'left' and 'up' buttons don't work how they're supposed to. The 'right' and 'down' buttons work fine. I just threw that together to show you what I'm talking about (excuse my inline styling).
First off, I need to incorporate touchEvents to make the full page scrolling work on mobile devices. If the user swipes left, right, down, or up, the page should move accordingly. I'm still learning the fundamentals of JS and I have no idea where to start with that.
Secondly, I have a few doubts about whether or not I'm using best practices in my JS. For one thing, I repeat myself a lot. For another, I'm pretty sure there's a simpler method for what I'm trying to do. I'd appreciate it if you could take a look at my code and give me some suggestions. Thanks!

You need to modify these two in CSS:
#center.cslide-up {
top: 100vh;
}
#center.cslide-left {
left: 100vw;
}
First one: When the up button is clicked, it will move 100vh down from top position.
Second one: When the left button is clicked, it will move 100vw right from left position.
As far as for mobile phones, I'd suggest try using:
Hammer.js : https://hammerjs.github.io/
Or Refer this answer: https://stackoverflow.com/a/23230280/2474466
And you can reduce the lines of code by cooking up a function and calling it like this: (Make sure to declare panel2 variable globally)
btnL.addEventListener('click', function() {
swiper("left");
});
btnLBack.addEventListener('click', function() {
swiper("left");
});
function swiper(dir){
panelC.classList.toggle('cslide-'+dir);
if(dir=="up") panel2=panelU;
else if(dir=="right") panel2=panelR;
else if(dir=="left") panel2=panelL;
else if(dir=="down") panel2=panelD;
panel2.classList.toggle('slide-'+dir);
}
The function swiper takes a single argument dir which determines in which direction it has to be moved. And you can concatenate the dir with cslide- to move the center container. And use if/else conditions to determine which panel to move and use the same idea for it as well.
And to make it more simpler and a bit efficient, if you're not making use of any other eventlisteners for the buttons or panels and the only aim is to toggle the class around, you can just use inline onClick="swiper('direction');" attribute on the panels and buttons to trigger it only when needed instead of defining the eventlisteners in the script.
var panel2;
var panelC = document.getElementById('center');
var panelU = document.getElementById('up');
var panelR = document.getElementById('right');
var panelD = document.getElementById('down');
var panelL = document.getElementById('left');
var btnU = document.getElementById('btn-up');
var btnR = document.getElementById('btn-right');
var btnD = document.getElementById('btn-down');
var btnL = document.getElementById('btn-left');
var btnUBack = document.getElementById('btn-up-back');
var btnRBack = document.getElementById('btn-right-back');
var btnDBack = document.getElementById('btn-down-back');
var btnLBack = document.getElementById('btn-left-back');
btnU.addEventListener('click', function() {
swiper("up");
});
btnUBack.addEventListener('click', function() {
swiper("up");
});
btnR.addEventListener('click', function() {
swiper("right");
});
btnRBack.addEventListener('click', function() {
swiper("right");
});
btnD.addEventListener('click', function() {
swiper("down");
});
btnDBack.addEventListener('click', function() {
swiper("down");
});
btnL.addEventListener('click', function() {
swiper("left");
});
btnLBack.addEventListener('click', function() {
swiper("left");
});
function swiper(dir){
panelC.classList.toggle('cslide-'+dir);
if(dir=="up") panel2=panelU;
else if(dir=="right") panel2=panelR;
else if(dir=="left") panel2=panelL;
else if(dir=="down") panel2=panelD;
panel2.classList.toggle('slide-'+dir);
}
* {
margin: 0;
padding: 0;
transition: 1.5s ease;
-webkit-transition: 1.5s ease;
overflow: hidden;
background: white;
}
.panel {
width: 100vw;
height: 100vh;
display: block;
position: absolute;
border: 1px solid blue;
}
.btn {
position: absolute;
padding: 16px;
cursor: pointer;
}
#center {
top: 0px;
left: 0px;
right: 0px;
bottom: 0px;
}
#center.cslide-up {
top: 100vh;
}
#center.cslide-left {
left: 100vw;
}
#center.cslide-right {
left: -100vw;
}
#center.cslide-down {
top: -100vh;
}
#up {
top: -100vh;
}
#up.slide-up {
top: 0;
}
#right {
right: -100vw;
}
#right.slide-right {
right: 0;
}
#down {
bottom: -100vh;
}
#down.slide-down {
bottom: 0;
}
#left {
left: -100vw
}
#left.slide-left {
left: 0;
}
<div class="panel" id="center">
<div class="btn" id="btn-up" style="text-align: center; width: 100%;">
up
</div>
<div class="btn" id="btn-right" style="right: 0; top: 50%;">
right
</div>
<div class="btn" id="btn-down" style="text-align: center; bottom: 0; width: 100%;">
down
</div>
<div class="btn" id="btn-left" style="top: 50%;">
left
</div>
</div>
<div class="panel" id="up">
<div class="btn" id="btn-up-back" style="bottom: 0; width: 100%; text-align: center;">
back
</div>
</div>
<div class="panel" id="right">
<div class="btn" id="btn-right-back" style="left: 0; top: 50%;">
back
</div>
</div>
<div class="panel" id="down">
<div class="btn" id="btn-down-back" style="top: 0; width: 100%; text-align: center;">
back
</div>
</div>
<div class="panel" id="left">
<div class="btn" id="btn-left-back" style="right: 0; top: 50%;">
back
</div>
</div>

how do I center javascript css popup div, no matter what the screen resolution?

I have the following code that opens a new popup window while disabling the background, the problem is that I have to position this so that it's 100px from the top (already got that through the CSS #dialog) and also in the center of the screen, no matter what the user's resolution is?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript">
function showPopUp(el) {
var cvr = document.getElementById("cover")
var dlg = document.getElementById(el)
cvr.style.display = "block"
dlg.style.display = "block"
if (document.body.style.overflow = "hidden") {
cvr.style.width = "1024"
cvr.style.height = "100%"
}
}
function closePopUp(el) {
var cvr = document.getElementById("cover")
var dlg = document.getElementById(el)
cvr.style.display = "none"
dlg.style.display = "none"
document.body.style.overflowY = "scroll"
}
</script>
<style type="text/css">
#cover {
display: none;
position: absolute;
left: 0px;
top: 0px;
width: 100%;
height: 100%;
background: gray;
filter: alpha(Opacity = 50);
opacity: 0.5;
-moz-opacity: 0.5;
-khtml-opacity: 0.5
}
#dialog {
display: none;
left: 100px;
top: 100px;
width: 300px;
height: 300px;
position: absolute;
z-index: 100;
background: white;
padding: 2px;
font: 10pt tahoma;
border: 1px solid gray
}
</style>
</head>
<body>
<div id="cover"></div>
<div id="dialog">
My Dialog Content
<br><input type="text">
<br><input type="button" value="Submit">
<br>[Close]
</div>
Show
</body>
</html>

CSS based solution to center:
You need to use these styles to make it appear dead-center:
position:absolute;
top:50%;
left:50%;
width:400px; /* adjust as per your needs */
height:400px; /* adjust as per your needs */
margin-left:-200px; /* negative half of width above */
margin-top:-200px; /* negative half of height above */
So position should be specified. The top and left should be 50%. The margin-left and margin-top should be negative one half of the width and height of the box respectively.
Notice that if you want your popup to appear on center even when page is scrolled you will have to use position:fixed instead with the draw back that it doesn't work in IE6.

Just do this:
.body {
position: relative;
}
.popup {
position: absolute;
max-width: 800px;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
no matters the screen or popup size. This will center the <div class="popup"></div>.

What you need is called a light-box.
To create it you should modify HTML,CSS and JS code.
Let's say your lightbox consist only of the string "login form". (You can put everything you want there) The HTML code should look like this:
<div id = "loginBox">login form</div>
Now, we need to hide it with CSS:
div#loginBox {
display: none;
}
Now our box is not visible. Lets modify our box as you want it to be 100px from the top:
div#loginBox {
display: none;
top: 100px;
}
We will worry about disabling the background later.
Our next job is to make a button that will display the box when we need it. Easy-peasy:
<div id = "loginBox" >login form</div>
<a id = "displayButton">login</a>
Note that we don't need the "href" attribute, because that will move the screen on clicking and other unwanted behavior.
Let's attach event handler on the button via JS:
var IE = document.all ? true : false; // obligatory "browser sniffing"
function display_box() {
document.getElementsById("loginBox").style.display = "inline-block"; // or "inline"
}
window.onload = function() {
var login_box = document.getElementsById("loginBox");
if (!IE) {
login_box.addEventListener( "click", display_box , false );
}
else {
login_box.attachEvent( "onclick", display_box );
}
}
But you want it to be in the center of the screen? Then the function goes like this:
function display_box() {
var theBox = document.getElementsById("loginBox").style,
left = document.width / 2 - 50; // 150 because it is 300 / 2
theBox.display = "inline-block";
theBox.left = left.toString() + "px";
}
I would guess that you will want to close the window at some point and make the "disabled background" effect. To do so you can create a div class that extends on the whole screen, attach a "display" event on it, put some z-index in the css to be sure the loginBox is over the "disabled background", and attach a "close the loginBox" event on the "background" div. And now the final code looks like this:
Note that we care only about the placement of the login-button, because the other are hidden from view, and then modified by JS:
HTML:
<div id = "loginBox" >login</div>
<a id = "displayButton">login</a>
<div id = "backgroundDarkener"> </div>
CSS:
div#loginBox {
display: none;
top: 100px;
width: 300px; #it is important to know the width of the box, to center it correctly
z-index: 2;
}
div#backgroundDarkener {
background: #000;
display: none;
position: fixed;
top: 0px;
left: 0px;
width: 100%;
height: 100%;
z-index: 1;
opacity: 0.8;
# needless to say, you should play with opacity or if you want your
# css to validate - background image (because I suspect it won't
# validate for old versions of IE, Safari, etc.) This is just a suggestion
}
JS:
var IE = document.all ? true : false; // obligatory "browser sniffing"
function display_box() {
var theBox = document.getElementsById("loginBox").style,
background = document.getElementsById("loginBox").style,
left = document.width / 2 - 150; // 150 is 300 / 2
theBox.display = "inline-block";
theBox.left = left.toString() + "px";
background.display = "inline-block";
}
function hide_box() {
document.getElementsById("loginBox").style.display = "none";
document.getElementsById("backgroundDarkener").style.display = "none";
}
window.onload = function() {
var login_box = document.getElementsById("loginBox"),
background = document.getElementsById("backgroundDarkener");
if (!IE) {
login_box.addEventListener( "click", display_box , false );
background.addEventListener( "click", hide_box , false );
}
else {
login_box.attachEvent( "onclick", display_box );
background.attachEvent( "onclick", hide_box );
}
}

A quick Google search found this;
function PopupCenter(pageURL, title,w,h) {
var left = (screen.width/2)-(w/2);
var top = (screen.height/2)-(h/2);
var targetWin = window.open (pageURL, title, 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, width='+w+', height='+h+', top='+top+', left='+left);
}

This is where flexbox comes rescue now!
.parent {
display: flex;
height: 300px; /* Or whatever */
}
.child {
width: 100px; /* Or whatever */
height: 100px; /* Or whatever */
margin: auto; /* Magic! */
}

You need to use these styles to make div center:
width:500px;
left:0;
right:0;
margin:0 auto;

Simple, margin: 100px auto;. There's no need to do calculations in JavaScript.
Live Example

How to toggle (hide / show) sidebar div using jQuery

I have 2 <div>s with ids A and B. div A has a fixed width, which is taken as a sidebar.
The layout looks like diagram below:
The styling is like below:
html, body {
margin: 0;
padding: 0;
border: 0;
}
#A, #B {
position: absolute;
}
#A {
top: 0px;
width: 200px;
bottom: 0px;
}
#B {
top: 0px;
left: 200px;
right: 0;
bottom: 0px;
}
I have <a id="toggle">toggle</a> which acts as a toggle button. On the toggle button click, the sidebar may hide to the left and div B should stretch to fill the empty space. On second click, the sidebar may reappear to the previous position and div B should shrink back to the previous width.
How can I get this done using jQuery?

$('button').toggle(
function() {
$('#B').css('left', '0')
}, function() {
$('#B').css('left', '200px')
})
Check working example at http://jsfiddle.net/hThGb/1/
You can also see any animated version at http://jsfiddle.net/hThGb/2/

See this fiddle for a preview and check the documentation for jquerys toggle and animate methods.
$('#toggle').toggle(function(){
$('#A').animate({width:0});
$('#B').animate({left:0});
},function(){
$('#A').animate({width:200});
$('#B').animate({left:200});
});
Basically you animate on the properties that sets the layout.
A more advanced version:
$('#toggle').toggle(function(){
$('#A').stop(true).animate({width:0});
$('#B').stop(true).animate({left:0});
},function(){
$('#A').stop(true).animate({width:200});
$('#B').stop(true).animate({left:200});
})
This stops the previous animation, clears animation queue and begins the new animation.

You can visit w3school for the solution on this the link is here and there is another example also available that might surely help,
Take a look

The following will work with new versions of jQuery.
$(window).on('load', function(){
var toggle = false;
$('button').click(function() {
toggle = !toggle;
if(toggle){
$('#B').animate({left: 0});
}
else{
$('#B').animate({left: 200});
}
});
});

Using Javascript
var side = document.querySelector("#side");
var main = document.querySelector("#main");
var togg = document.querySelector("#toogle");
var width = window.innerWidth;
window.document.addEventListener("click", function() {
if (side.clientWidth == 0) {
// alert(side.clientWidth);
side.style.width = "200px";
main.style.marginLeft = "200px";
main.style.width = (width - 200) + "px";
togg.innerHTML = "Min";
} else {
// alert(side.clientWidth);
side.style.width = "0";
main.style.marginLeft = "0";
main.style.width = width + "px";
togg.innerHTML = "Max";
}
}, false);
button {
width: 100px;
position: relative;
display: block;
}
div {
position: absolute;
left: 0;
border: 3px solid #73AD21;
display: inline-block;
transition: 0.5s;
}
#side {
left: 0;
width: 0px;
background-color: red;
}
#main {
width: 100%;
background-color: white;
}
<button id="toogle">Max</button>
<div id="side">Sidebar</div>
<div id="main">Main</div>

$('#toggle').click(function() {
$('#B').toggleClass('extended-panel');
$('#A').toggle(/** specify a time here for an animation */);
});
and in the CSS:
.extended-panel {
left: 0px !important;
}

$(document).ready(function () {
$(".trigger").click(function () {
$("#sidebar").toggle("fast");
$("#sidebar").toggleClass("active");
return false;
});
});
<div>
<a class="trigger" href="#">
<img id="icon-menu" alt='menu' height='50' src="Images/Push Pin.png" width='50' />
</a>
</div>
<div id="sidebar">
</div>
Instead #sidebar give the id of ur div.

This help to hide and show the sidebar, and the content take place of the empty space left by the sidebar.
<div id="A">Sidebar</div>
<div id="B"><button>toggle</button>
Content here: Bla, bla, bla
</div>
//Toggle Hide/Show sidebar slowy
$(document).ready(function(){
$('#B').click(function(e) {
e.preventDefault();
$('#A').toggle('slow');
$('#B').toggleClass('extended-panel');
});
});
html, body {
margin: 0;
padding: 0;
border: 0;
}
#A, #B {
position: absolute;
}
#A {
top: 0px;
width: 200px;
bottom: 0px;
background:orange;
}
#B {
top: 0px;
left: 200px;
right: 0;
bottom: 0px;
background:green;
}
/* makes the content take place of the SIDEBAR
which is empty when is hided */
.extended-panel {
left: 0px !important;
}