onClick add/remove class inside loop is not working in jquery

onClick add/remove class inside loop is not working in jquery - javascript

I'm working on flexslider here onClick next I want to add class it is working but randomly click is coming when I first click class added then on second click not coming third click coming so on. I want to add a class every click. Here might be the problem in if()
$('.flex-next').on('click', function() {
if ($('.timeline span').hasClass('clicked')) {
$('.timeline span.clicked').removeClass('clicked');
$(this).addClass('clicked');
} else {
$('.timeline span').removeClass('clicked');
$('.timeline span').addClass('clicked');
}
});
.timeline {
content: '';
background-color: rgba(255, 255, 255, 0.52);
display: block;
width: 100px;
height: 2px;
-webkit-transform: rotate(-90deg);
transform: rotate(-90deg);
position: relative;
}
.timeline span:before {
position: absolute;
left: 0;
top: -1px;
content: '';
background-color: red;
display: block;
height: 3px;
animation: yourAnimation 1s 0s linear;
}
.timeline span.clicked {
position: absolute;
left: 0;
top: -1px;
content: '';
background-color: blue;
display: block;
height: 3px;
animation: yourAnimation 1s 0s linear;
}
#keyframes yourAnimation {
0% {
width: 0;
}
50% {
width: 50%;
}
82% {
width: 100%;
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="flex-next">Click here</div>
<span class="timeline">
<span></span>
</span>

You can acheive the required functionality as
$('.flex-next').on('click', function(){
if (! ($('.timeline span').hasClass('clicked')) ) {
$('.timeline span').addClass('clicked');
setTimeOut(function(){
$('.timeline span').removeClass('clicked');
} , 200)
}
});

To add/remove a class on click, it is better to use jquery toggleClass function.
Moreover you may need to execute the click event after the document is loaded correctly
$( document ).ready(function() {
$('.flex-next').on('click', function(){
$('.timeline span').toggleClass( "clicked" );
});
});
For more info, you may refer to: http://api.jquery.com/toggleclass/

Related

problem on onclick() event for more than one clicks done on a div

i have an html page where,when hovered over the first image a second image fades in/is shown.The first image has an onclick() event which performs a transition of rotating the image and scaling it by some number.During the transition, the first image disappears and some text appears on the same place(area of the div tag of the first image).I perform the transition through javascript and the hovering animation using css. Now when i click on the text(or the area of the div tag) the transition must reverse back i.e., the div area must be as it was before clicking(even with the hovering working.). I would like to know the answer through pure javascript please.
Thank you in advance.
timesclicked = 0;
document.getElementById("hoverImage").addEventListener("click", function()
{
var x = document.getElementById('container');
timesclicked+=1;
if(timesclicked%2!=0)
{
//obj.style.opacity = '0.5';
x.style.transform = 'rotateZ(-360deg) scale(1.4)';
x.style.transition = 'all 1.5s ease-in-out';
setTimeout(() => {
x.innerHTML = '<div style="font-size:16px; font-family: monospace; font-weight:bold; text-align:center; "> My Hero Academia, abbreviated as HeroAca is a Japanese superhero manga series written and illustrated by Kōhei Horikoshi. It has been serialized in Weekly Shōnen Jump since July 2014, and, as of February 2019, 22 volumes have been collected in tankōbon format.</div>'},'1300');
}
else
{
x.style.transform = 'rotateZ(-45deg) scale(1)';
x.style.transition = 'all 1.5s ease-in-out';
setTimeout(() => {
x.innerHTML = '<img src="https://picsum.photos/300">'},'500');
}
});
img
{
width: 300px;
height: 300px;
}
#mainImage,#hoverImage
{
left: 0px;
position: absolute;
top: 0px;
}
#hoverImage
{
opacity: 0;
transition: opacity 0.4s 0.1s ;
}
#hoverImage:hover
{
opacity: 1;
}
#container
{
background: url(https://picsum.photos/300);
background-size: cover;
width: 300px;
height: 300px;
position: absolute;
top:20%;
left:40%;
transform: rotateZ(-45deg);
}
#container:before
{
content: "";
display: block;
position: fixed;
width: 100%;
height: 100%;
left: 0;
top: 0;
z-index: -1;
background-color: rgba(255, 255, 255, 0.6);
}
<div id="container" >
<img id="mainImage" src="https://picsum.photos/300">
<img id="hoverImage" src="https://picsum.photos/300">
</div>
As much as i know, I think the second clicking event is not happening because the eventlistener is on the hoverImage. I need a way to run the else part of the code somehow.

It looks like there are a few problems with your code, and you're going to have some debugging to do. That said, try this for a strategy:
Put your on-click event on the #container.
Put all the styling and transitioning details in the css. Your javascript will just add and remove a class from the #container.
Don't track the number of clicks unless you need it for something else. Have your if statement check for the presence or absence of the class you're toggling. (Or use an explicit toggle instead of an if-else block.)
Don't add and remove the text and background in the javascript, put them both in the HTML and control their visibility using the CSS.
edit:
People asked for examples and clarification. I'm stealing some of this from other people's answers.
I'm not completely sure I've understood OP's intentions correctly, and there are some rough-around-the-edgues details (like the cursor when you hover before clicking), but I think this should serve as an example:
let container = document.getElementById("container");
container.addEventListener("click", function(){
container.classList.toggle("selected");
});
#mainImage, #hoverImage, #selectedText {
width: 300px;
height: 300px;
left: 0px;
position: absolute;
top: 0px;
}
#hoverImage {
opacity: 0;
transition: opacity 0.4s 0.1s;
}
#container:hover > #hoverImage {
opacity: 1;
}
#container {
width: 300px;
height: 300px;
position: absolute;
top:20%;
left:40%;
transform: rotateZ(-45deg);
transition: all 1.5s ease-in-out;
}
#container.selected {
transform: rotateZ(-360deg) scale(1.4);
}
#container:before {
content: "";
display: block;
position: fixed;
width: 100%;
height: 100%;
left: 0;
top: 0;
z-index: -1;
background-color: rgba(255, 255, 255, 0.6);
}
#selectedText {
font-size:16px;
font-family: monospace;
font-weight:bold;
text-align:center;
background: url(https://picsum.photos/300?text);
background-size: cover;
opacity: 0;
transition: opacity 0.1s 0.5s;
}
#container.selected > #selectedText {
opacity: 1;
transition: opacity 0.1s 1.3s;
}
<div id="container">
<img id="mainImage" src="https://picsum.photos/300?main">
<img id="hoverImage" src="https://picsum.photos/300?hover">
<div id="selectedText">
My Hero Academia, abbreviated as HeroAca is a Japanese superhero
manga series written and illustrated by Kōhei Horikoshi. It has been
serialized in Weekly Shōnen Jump since July 2014, and, as of
February 2019, 22 volumes have been collected in tankōbon format.
</div>
</div>

you can add the click event listener on the container div.
timesclicked = 0;
document.getElementById("container").addEventListener("click", function()
{
var x = document.getElementById('container');
timesclicked+=1;
if(timesclicked%2!=0)
{
//obj.style.opacity = '0.5';
x.style.transform = 'rotateZ(-360deg) scale(1.4)';
x.style.transition = 'all 1.5s ease-in-out';
setTimeout(() => {
x.innerHTML = '<div style="font-size:16px; font-family: monospace; font-weight:bold; text-align:center; "> My Hero Academia, abbreviated as HeroAca is a Japanese superhero manga series written and illustrated by Kōhei Horikoshi. It has been serialized in Weekly Shōnen Jump since July 2014, and, as of February 2019, 22 volumes have been collected in tankōbon format.</div>'},'1300');
}
else
{
x.style.transform = 'rotateZ(-45deg) scale(1)';
x.style.transition = 'all 1.5s ease-in-out';
setTimeout(() => {
x.innerHTML = '<img src="https://picsum.photos/300">'},'500');
}
});
img
{
width: 300px;
height: 300px;
}
#mainImage,#hoverImage
{
left: 0px;
position: absolute;
top: 0px;
}
#hoverImage
{
opacity: 0;
transition: opacity 0.4s 0.1s ;
}
#hoverImage:hover
{
opacity: 1;
}
#container
{
background: url(https://picsum.photos/300);
background-size: cover;
width: 300px;
height: 300px;
position: absolute;
top:20%;
left:40%;
transform: rotateZ(-45deg);
}
#container:before
{
content: "";
display: block;
position: fixed;
width: 100%;
height: 100%;
left: 0;
top: 0;
z-index: -1;
background-color: rgba(255, 255, 255, 0.6);
}
<div id="container" >
<img id="mainImage" src="https://picsum.photos/300">
<img id="hoverImage" src="https://picsum.photos/300">
</div>
</style>

if I understand your problem correctly, I think you just need to move the transition styles into your CSS
x.style.transition = 'all 1.5s ease-in-out';

jQuery mouseover and mouseout not functioning as desired

Im having an issue where jquery mouseover and mouseout do not work with the css function..
I am trying to have transition effects for buttons on an image slider.
My HTML Code:
<div id="hero">
<div id="next">
<img class="nxt" src="http://www.uk-timber.co.uk/ebay2014/images/jsSlider/next.png"/>
</div>
<!--END--Next-->
<div id="prev">
<img class="prv" src="http://www.uk-timber.co.uk/ebay2014/images/jsSlider/prev.png"/>
</div>
<!--END--Prev-->
<div id="slider">
<img src="http://www.uk-timber.co.uk/ebay2014/images/jsSlider/slides/slide1.png"/>
<img src="http://www.uk-timber.co.uk/ebay2014/images/jsSlider/slides/slide2.png"/>
<img src="http://www.uk-timber.co.uk/ebay2014/images/jsSlider/slides/slide3.png"/>
</div>
<!--END--Slider-->
</div>
<!--END--Hero-->
My CSS Code:
#hero {
width: 944px; height: 360px;
position: relative;
margin: auto;
}
#slider {
width: 944px; height: 360px;
position: absolute;
overflow: hidden;
}
#next {
position: absolute;
top: 250px;
right: 15px;
z-index: 99;
cursor: pointer;
opacity: 0.3;
}
#prev {
position: absolute;
top: 250px;
left: 15px;
z-index: 99;
cursor: pointer;
opacity: 0.3;
}
and finally my JS Code:
$(function () {
$("#hero").mouseover(function () {
$this = $(this);
$this.find("#next").css(
"transition":"all 0.2s ease-in",
"opacity":"1"
);
}).mouseout(function () {
$this = $(this);
$this.find("#next").css(
"transition":"all 0.2s ease-out",
"opacity":"0.3"
);
});
});
Please bare in mind i am new to javascript and jquery so any help is much appreciated.

Try mouseleave function.
$(function(){
$("#hero").mouseover(function () {
$this = $(this);
$this.find("#next").css({
"transition":"all 0.2s ease-in",
"opacity":"1"
});
}).mouseleave(function () {
$this = $(this);
$this.find("#next").css({
"transition":"all 0.2s ease-out",
"opacity":"0.3"
});
});
});

I've put your code in a Fiddle. This won't work.
Then I cleaned it up a bit and got rid of some syntax errors here and voila: it works.
Note: If you're only going to change the opacity, you better do it with just CSS:
#next{
opacity: 0.3;
transition: all 0.2s;
transition-timing-function: ease-out;
}
#hero:hover #next{
opacity: 1;
transition-timing-function: ease-in;
}
/*DON'T FORGET TO PREFIX THE TRANSITION-ATTRIBUTES*/

How to remove hover state

1) I created an image with an opacity of 1. When you hover over it, the opacity becomes .3 and a button appears over the image. The problem, is that when you hover over the button, the opacity of the image returns to 1. How can I make the opacity of the image stay .3 when the hover is both over the image OR the button?
2) When you click play, the original image changes to a new image. But since the mouse is over the image, the new image has an opacity .3. How can I set the new image to have an opacity of 1 even when its hovered?
var originalImgSrc = $('img').attr('src');
// Change image on button click
$(".the-buttons").click(function() {
$('img').attr("src", "https://s3.amazonaws.com/blitzbase-assets/assets/2.gif");
$(this).addClass("hide");
});
//Restore image on mouse out
$('.show-image img').mouseout(function() {
$('img').attr("src", originalImgSrc);
$('.the-buttons').removeClass("hide");
});
div.show-image {
position: relative;
float: left;
margin: 0px;
padding: 0px;
background: #333;
}
div.show-image img {
opacity: 1;
background: white;
}
div.show-image img:hover {
opacity: .3;
-webkit-transition: opacity .2s ease-in-out;
}
div.show-image:hover input {
display: block;
}
div.show-image input {
position: absolute;
display: none;
top: 100px;
left: 100px;
}
div.show-image input.hide {
display: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="show-image">
<img src="https://via.placeholder.com/100.png/09f/fff" />
<input class="the-buttons" type="button" value="Play" />
</div>

Here's a fiddle
Here's the answer to both of your questions.
Put the hover on the parent:
.show-image:hover img
Add the "hide" class on the parent and change the opacity that way.
$(this).parent().addClass("hide");
div.show-image.hide img{
opacity: 1;
}
To add the play button back on hover after clicking the first time you would have to remove the hide class from the parent in your mouse out function:
$('.the-buttons').parent().removeClass("hide");

change your css
from this:
div.show-image img:hover {
opacity: .3;
-webkit-transition: opacity .2s ease-in-out;
}
to this:
div.show-image:hover img {
opacity: .3;
-webkit-transition: opacity .2s ease-in-out;
}
Hope this helps. Full snippet:
var originalImgSrc = $('img').attr('src');
// Change image on button click
$(".the-buttons").click(function() {
$('img').attr("src", "https://s3.amazonaws.com/blitzbase-assets/assets/2.gif");
$(this).addClass("hide");
});
//Restore image on mouse out
$('.show-image img').mouseout(function() {
$('img').attr("src", originalImgSrc);
$('.the-buttons').removeClass("hide");
});
div.show-image {
position: relative;
float: left;
margin: 0px;
padding: 0px;
background: #333;
}
div.show-image img {
opacity: 1;
background: white;
}
div.show-image:hover img {
opacity: .3;
-webkit-transition: opacity .2s ease-in-out;
}
div.show-image:hover input {
display: block;
}
div.show-image input {
position: absolute;
display: none;
top: 100px;
left: 100px;
}
div.show-image input.hide {
display: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="show-image">
<img src="https://via.placeholder.com/100.png/09f/fff" />
<input class="the-buttons" type="button" value="Play" />
</div>

I removed your opacity from the CSS, and placed it within your jQuery function. I also replaced your event handler with .hover(), and targeted the parent container.
$('.show-image').hover(
function() {
$(this)
.find('img').css('opacity', '.3').end()
.find('input').show();
}, function() {
$(this)
.find('img').css('opacity', '1').attr("src", originalImgSrc).end()
.find('input').hide();
}
);
var originalImgSrc = $('img').attr('src');
// Change image on button click
$(".the-buttons").click(function() {
$('img').attr("src", "https://s3.amazonaws.com/blitzbase-assets/assets/2.gif").css('opacity', 1);
$(this).hide();
});
$('.show-image').hover(
function() {
$(this)
.find('img').css('opacity', '.3').end()
.find('input').show();
},
function() {
$(this)
.find('img').css('opacity', '1').attr("src", originalImgSrc).end()
.find('input').hide();
}
);
div.show-image {
position: relative;
float: left;
margin: 0px;
padding: 0px;
background: #333;
}
div.show-image img {
background: white;
}
div.show-image:hover input {
display: block;
}
div.show-image input {
position: absolute;
display: none;
top: 100px;
left: 100px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="show-image">
<img src="https://via.placeholder.com/100.png/09f/fff" />
<input class="the-buttons" type="button" value="Play" />
</div>
Also, note the update I made to restore opacity on clicking 'Play'.

You can use mouseover/mouseout events to add/remove class and add css to that class, I added the .hovered class.
var originalImgSrc = $('img').attr('src');
// Change image on button click
$(".the-buttons").click(function() {
$('img').attr("src", "https://s3.amazonaws.com/blitzbase-assets/assets/2.gif");
$(this).addClass("hide");
});
function addHOVER() {
$('.show-image img').addClass("hovered");
}
function remHOVER() {
$('.show-image img').removeClass("hovered");
}
$(".show-image img").mouseover(addHOVER);
$(".show-image .the-buttons").mouseover(addHOVER);
$(".show-image .the-buttons").mouseout(remHOVER);
//Restore image on mouse out
$('.show-image img').mouseout(function() {
$('img').attr("src", originalImgSrc);
remHOVER();
$('.the-buttons').removeClass("hide");
});
div.show-image {
position: relative;
float: left;
margin: 0px;
padding: 0px;
background: #333;
}
div.show-image img {
opacity: 1;
background: white;
}
div.show-image img.hovered {
opacity: .3;
-webkit-transition: opacity .2s ease-in-out;
}
div.show-image:hover input {
display: block;
}
div.show-image input {
position: absolute;
display: none;
top: 100px;
left: 100px;
}
div.show-image input.hide {
display: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="show-image">
<img src="https://via.placeholder.com/100.png/09f/fff" />
<input class="the-buttons" type="button" value="Play" />
</div>

JQUERY image overlay fadeIn() fades in and out when mouseover

I am looking to get a nice smooth rollover image to fadeIn over the parent image for a set of buttons.
I have my overlay image stacked ontop of my main image, and it's set to "display: none;".
I have the following jQuery, and it works to FadeIn the overlay image, but it fades it in and out repeatedly when the mouse is over the image. Do I have something wrong in the syntax for my jQuery? Thanks in advance.
<script type="text/javascript">
jQuery(document).ready(function() {
jQuery(".main").mouseenter(function() {
jQuery(".overlay").fadeIn();
});
jQuery(".main").mouseleave(function() {
jQuery(".overlay").fadeOut();
});
});
</script>
and my HTML code:
<style type="text/css">
<!--
.hoverbox { position: relative; }
.main { width: 243px; height: 117px; }
.overlay { position: absolute; width: 243px; height: 117px; top: 0; left: 0; display: none; }
-->
</style>
<!-- button 1 -->
<div class="hoverbox" style="float: left; width: 243px; height: 117px;">
<a href="/locations/sacramento-international-airport/">
<img class="main" src="/images/home-button-smf_orig.jpg" />
<img class="overlay" src="/images/home-button-smf_rollover.jpg" />
</a>
</div>
<!-- end button 1 -->

Try this instead:
<script>
$(document).ready(function() {
$(".hoverbox").on("mouseenter", function(){
$(".overlay").stop(true, true).fadeIn();
});
$(".hoverbox").on("mouseleave", function(){
$(".overlay").stop(true, true).fadeOut();
});
});
</script>
I think hovering over the image itself was a bad idea, here I use the parent container. Also, using the on() method is now the preferred way to trigger mouse enter and leave events.
Good luck!

Michael's answer is a good one and will work, but it may be preferable to use CSS transitions for the animation and reserve jQuery for the behavior.
Here's a demo.
JavaScript
$(".hoverbox")
.mouseenter(function () {
$(this).addClass("on");
})
.mouseleave(function () {
$(this).removeClass("on");
});
CSS
.overlay {
opacity: 0;
position: absolute;
top: 0;
left: 0;
-webkit-transition: .4s;
-moz-transition: .4s;
-o-transition: .4s;
-transition: .4s;
}
.hoverbox.on .overlay {
opacity: 1;
}
Here's a demo of the former approach (similar to Michael's answer). Also, your CSS has been cleaned up for both examples.

css is enough in this case, try the below code
.main:hover + .overlay{ display:block; }
and make sure overlay has a higher z-index
.overlay {
position: absolute; width: 243px; height: 117px;
top: 0; left: 0; display: none; z-index: 2;
}
http://jsfiddle.net/Grhqn/1/
for graceful fading
.overlay {
position: absolute; width: 243px; height: 117px; top: 0;
left: 0; z-index: 2; transition: opacity 1.5s ease; opacity:0;
}
.overlay:hover { opacity:1; }
http://jsfiddle.net/Grhqn/3/

How to show Page Loading div until the page has finished loading?

I have a section on our website that loads quite slowly as it's doing some intensive calls.
Any idea how I can get a div to say something similar to "loading" to show while the page prepares itself and then vanish when everything is ready?

Original Answer
I've needed this and after some research I came up with this (jQuery needed):
First, right after the <body> tag add this:
<div id="loading">
<img id="loading-image" src="path/to/ajax-loader.gif" alt="Loading..." />
</div>
Then add the style class for the div and image to your CSS:
#loading {
position: fixed;
display: block;
width: 100%;
height: 100%;
top: 0;
left: 0;
text-align: center;
opacity: 0.7;
background-color: #fff;
z-index: 99;
}
#loading-image {
position: absolute;
top: 100px;
left: 240px;
z-index: 100;
}
Then, add this javascript to your page (preferably at the end of your page, before your closing </body> tag, of course):
<script>
$(window).load(function() {
$('#loading').hide();
});
</script>
Finally, adjust the position of the loading image and the background-color of the loading div with the style class.
This is it, should work just fine. But of course you should have an ajax-loader.gif somewhere or use base64 url for image's src value. Freebies here. (Right-click > Save Image As...)
Update
For jQuery 3.0 and above you can use:
<script>
$(window).on('load', function () {
$('#loading').hide();
})
</script>
Update
The original answer is from jQuery and before flexbox era. You can use many view management libraries / frameworks now like Angular, React and Vue.js. And for CSS you have flexbox option. Below is CSS alternative:
#loading {
position: fixed;
display: flex;
justify-content: center;
align-items: center;
width: 100%;
height: 100%;
top: 0;
left: 0;
opacity: 0.7;
background-color: #fff;
z-index: 99;
}
#loading-image {
z-index: 100;
}

This script will add a div that covers the entire window as the page loads. It will show a CSS-only loading spinner automatically. It will wait until the window (not the document) finishes loading, then it will wait an optional extra few seconds.
Works with jQuery 3 (it has a new window load event)
No image needed but it's easy to add one
Change the delay for more branding or instructions
Only dependency is jQuery.
CSS loader code from https://projects.lukehaas.me/css-loaders
$('body').append('<div style="" id="loadingDiv"><div class="loader">Loading...</div></div>');
$(window).on('load', function(){
setTimeout(removeLoader, 2000); //wait for page load PLUS two seconds.
});
function removeLoader(){
$( "#loadingDiv" ).fadeOut(500, function() {
// fadeOut complete. Remove the loading div
$( "#loadingDiv" ).remove(); //makes page more lightweight
});
}
.loader,
.loader:after {
border-radius: 50%;
width: 10em;
height: 10em;
}
.loader {
margin: 60px auto;
font-size: 10px;
position: relative;
text-indent: -9999em;
border-top: 1.1em solid rgba(255, 255, 255, 0.2);
border-right: 1.1em solid rgba(255, 255, 255, 0.2);
border-bottom: 1.1em solid rgba(255, 255, 255, 0.2);
border-left: 1.1em solid #ffffff;
-webkit-transform: translateZ(0);
-ms-transform: translateZ(0);
transform: translateZ(0);
-webkit-animation: load8 1.1s infinite linear;
animation: load8 1.1s infinite linear;
}
#-webkit-keyframes load8 {
0% {
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
}
100% {
-webkit-transform: rotate(360deg);
transform: rotate(360deg);
}
}
#keyframes load8 {
0% {
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
}
100% {
-webkit-transform: rotate(360deg);
transform: rotate(360deg);
}
}
#loadingDiv {
position:absolute;;
top:0;
left:0;
width:100%;
height:100%;
background-color:#000;
}
This script will add a div that covers the entire window as the page loads. It will show a CSS-only loading spinner automatically. It will wait until the window (not the document) finishes loading.
<ul>
<li>Works with jQuery 3, which has a new window load event</li>
<li>No image needed but it's easy to add one</li>
<li>Change the delay for branding or instructions</li>
<li>Only dependency is jQuery.</li>
</ul>
Place the script below at the bottom of the body.
CSS loader code from https://projects.lukehaas.me/css-loaders
<!-- Place the script below at the bottom of the body -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

window.onload = function(){ document.getElementById("loading").style.display = "none" }
#loading {width: 100%;height: 100%;top: 0px;left: 0px;position: fixed;display: block; z-index: 99}
#loading-image {position: absolute;top: 40%;left: 45%;z-index: 100}
<div id="loading">
<img id="loading-image" src="img/loading.gif" alt="Loading..." />
</div>
Page loading image with simplest fadeout effect created in JS:

I have another below simple solution for this which perfectly worked for me.
First of all, create a CSS with name Lockon class which is transparent overlay along with loading GIF as shown below
.LockOn {
display: block;
visibility: visible;
position: absolute;
z-index: 999;
top: 0px;
left: 0px;
width: 105%;
height: 105%;
background-color:white;
vertical-align:bottom;
padding-top: 20%;
filter: alpha(opacity=75);
opacity: 0.75;
font-size:large;
color:blue;
font-style:italic;
font-weight:400;
background-image: url("../Common/loadingGIF.gif");
background-repeat: no-repeat;
background-attachment: fixed;
background-position: center;
}
Now we need to create our div with this class which cover entire page as an overlay whenever the page is getting loaded
<div id="coverScreen" class="LockOn">
</div>
Now we need to hide this cover screen whenever the page is ready and so that we can restrict the user from clicking/firing any event until the page is ready
$(window).on('load', function () {
$("#coverScreen").hide();
});
Above solution will be fine whenever the page is loading.
Now the question is after the page is loaded, whenever we click a button or an event which will take a long time, we need to show this in the client click event as shown below
$("#ucNoteGrid_grdViewNotes_ctl01_btnPrint").click(function () {
$("#coverScreen").show();
});
That means when we click this print button (which will take a long time to give the report) it will show our cover screen with GIF which gives result and once the page is ready above windows on load function will fire and which hide the cover screen once the screen is fully loaded.

Default the contents to display:none and then have an event handler that sets it to display:block or similar after it's fully loaded. Then have a div that's set to display:block with "Loading" in it, and set it to display:none in the same event handler as before.

Here's the jQuery I ended up using, which monitors all ajax start/stop, so you don't need to add it to each ajax call:
$(document).ajaxStart(function(){
$("#loading").removeClass('hide');
}).ajaxStop(function(){
$("#loading").addClass('hide');
});
CSS for the loading container & content (mostly from mehyaa's answer), as well as a hide class:
#loading {
width: 100%;
height: 100%;
top: 0px;
left: 0px;
position: fixed;
display: block;
opacity: 0.7;
background-color: #fff;
z-index: 99;
text-align: center;
}
#loading-content {
position: absolute;
top: 50%;
left: 50%;
text-align: center;
z-index: 100;
}
.hide{
display: none;
}
HTML:
<div id="loading" class="hide">
<div id="loading-content">
Loading...
</div>
</div>

Well, this largely depends on how you're loading the elements needed in the 'intensive call', my initial thought is that you're doing those loads via ajax. If that's the case, then you could use the 'beforeSend' option and make an ajax call like this:
$.ajax({
type: 'GET',
url: "some.php",
data: "name=John&location=Boston",
beforeSend: function(xhr){ <---- use this option here
$('.select_element_you_want_to_load_into').html('Loading...');
},
success: function(msg){
$('.select_element_you_want_to_load_into').html(msg);
}
});
EDIT
I see, in that case, using one of the 'display:block'/'display:none' options above in conjunction with $(document).ready(...) from jQuery is probably the way to go. The $(document).ready() function waits for the entire document structure to be loaded before executing (but it doesn't wait for all media to load). You'd do something like this:
$(document).ready( function() {
$('table#with_slow_data').show();
$('div#loading image or text').hide();
});

My blog will work 100 percent.
function showLoader()
{
$(".loader").fadeIn("slow");
}
function hideLoader()
{
$(".loader").fadeOut("slow");
}
.loader {
position: fixed;
left: 0px;
top: 0px;
width: 100%;
height: 100%;
z-index: 9999;
background: url('pageLoader2.gif') 50% 50% no-repeat rgb(249,249,249);
opacity: .8;
}
<div class="loader"></div>

Create a <div> element that contains your loading message, give the <div> an ID, and then when your content has finished loading, hide the <div>:
$("#myElement").css("display", "none");
...or in plain JavaScript:
document.getElementById("myElement").style.display = "none";

This will be in synchronisation with an api call, When the api call is triggered, the loader is shown. When the api call is succesful, the loader is removed. This can be used for either page load or during an api call.
$.ajax({
type: 'GET',
url: url,
async: true,
dataType: 'json',
beforeSend: function (xhr) {
$( "<div class='loader' id='searching-loader'></div>").appendTo("#table-playlist-section");
$("html, body").animate( { scrollTop: $(document).height() }, 100);
},
success: function (jsonOptions) {
$('#searching-loader').remove();
.
.
}
});
CSS
.loader {
border: 2px solid #f3f3f3;
border-radius: 50%;
border-top: 2px solid #3498db;
width: 30px;
height: 30px;
margin: auto;
-webkit-animation: spin 2s linear infinite; /* Safari */
animation: spin 2s linear infinite;
margin-top: 35px;
margin-bottom: -35px;
}
/* Safari */
#-webkit-keyframes spin {
0% { -webkit-transform: rotate(0deg); }
100% { -webkit-transform: rotate(360deg); }
}
#keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}

for drupal in your theme
custom_theme.theme file
function custom_theme_preprocess_html(&$variables) {
$variables['preloader'] = 1;
}
In html.html.twig file after skip main content link in body
{% if preloader %}
<div id="test-preloader" >
<div id="preloader-inner" class="cssload-container">
<div class="wait-text">{{ 'Please wait...'|t }} </div>
<div class="cssload-item cssload-moon"></div>
</div>
</div>
{% endif %}
in css file
#test-preloader {
position: fixed;
background: white;
width: 100%;
height: 100%;
top: 0;
left: 0;
z-index: 9999;
}
.cssload-container .wait-text {
text-align: center;
padding-bottom: 15px;
color: #000;
}
.cssload-container .cssload-item {
margin: auto;
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
width: 131px;
height: 131px;
background-color: #fff;
box-sizing: border-box;
-o-box-sizing: border-box;
-ms-box-sizing: border-box;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-shadow: 0 0 21px 3px rgba(130, 130, 130, 0.26);
-o-box-shadow: 0 0 21px 3px rgba(130, 130, 130, 0.26);
-ms-box-shadow: 0 0 21px 3px rgba(130, 130, 130, 0.26);
-webkit-box-shadow: 0 0 21px 3px rgba(130, 130, 130, 0.26);
-moz-box-shadow: 0 0 21px 3px rgba(130, 130, 130, 0.26);
}
.cssload-container .cssload-moon {
border-bottom: 26px solid #008AFA;
border-radius: 50%;
-o-border-radius: 50%;
-ms-border-radius: 50%;
-webkit-border-radius: 50%;
-moz-border-radius: 50%;
animation: spin 1.45s ease infinite;
-o-animation: spin 1.45s ease infinite;
-ms-animation: spin 1.45s ease infinite;
-webkit-animation: spin 1.45s ease infinite;
-moz-animation: spin 1.45s ease infinite;
}

I needed a splash screen, which I implemented by reusing parts of the solutions listed here. It uses Vanilla JS for full backwards-compatibility.
Step 1: Add a background with a spinner gif on top of the page, then remove them when everything is loaded.
body.has-js::before {
content: '';
position: fixed;
left: 0;
right: 0;
top: 0;
bottom: 0;
z-index: 10;
height: 100vh;
width: 100vw;
pointer-events: none;
transition: all .2s;
background: white url('/img/spinner.gif') no-repeat center center / 50px;
}
body.loaded::before {
opacity: 0;
width: 0;
height: 0;
}
Step 2: Add a little script right after the opening body tag to start displaying the load/splash screen.
<body>
<script>
// Only show loader if JS is available
document.body.className += ' has-js';
// Option 1: Hide loader when 'load' event fires
window.onload = function() { document.body.className += ' loaded'; }
// Option 2: Hide loader after 2 seconds, in case the 'load' event never fires
setTimeout(function(){ document.body.className += ' loaded'; }, 1000 * 2);
</script>
<!-- Page content goes after this -->
</body>

Based on #mehyaa answer, but much shorter:
HTML (right after <body>):
<img id = "loading" src = "loading.gif" alt = "Loading indicator">
CSS:
#loading {
position: absolute;
top: 50%;
left: 50%;
width: 32px;
height: 32px;
/* 1/2 of the height and width of the actual gif */
margin: -16px 0 0 -16px;
z-index: 100;
}
Javascript (jQuery, since I'm already using it):
$(window).load(function() {
$('#loading').remove();
});

Develop Reference

JavaScript is the programming language of the Web.

onClick add/remove class inside loop is not working in jquery - javascript

You can acheive the required functionality as $('.flex-next').on('click', function(){ if (! ($('.timeline span').hasClass('clicked')) ) { $('.timeline span').addClass('clicked'); setTimeOut(function(){ $('.timeline span').removeClass('clicked'); } , 200) } });

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