Develop Reference

How to make font icon be full of a block element?

I want to make a rotated animation of a font icon, but I can not let the center be the right place, The rotation is always offset a little.
Here is the example:
#keyframes circle {
from {transform: rotate(0deg);}
to {transform: rotate(360deg);}
}
div {
padding:0;
margin:0;
}
.container {
position:absolute;
top:50px;
left:50px;
border:1px solid red;
font-size:20px;
}
.inner {
line-height:0;
animation-name:circle;
animation-duration: 1s;
animation-iteration-count: infinite;
}
<link href="https://use.fontawesome.com/releases/v5.7.0/css/all.css" rel="stylesheet"/>
<div class="container"><div class="inner"><i class="fas fa-adjust"></i></div></div>
JSFiddle : https://jsfiddle.net/217z69sm/2/

It seems like font-awesome are aware of this, and there suggestion seems to be to switch to the svg version, or to use display: block:
Icon Animation + Wobbles
We’ve worked hard to keep icons perfectly
centered when they are spinning or pulsing. However, we’ve seen issues
with several browsers and the web fonts + CSS version of Font Awesome.
Through a lot of investigation this appears to be an issue with web
fonts in general and not something we can directly fix. We do have a
couple of ways you might be able to work around this:
Switch Frameworks - Switch to the SVG with JavaScript version, it’s
working a lot better for this. Set the display of the animating icon -
Use display: block; where you can. This seems to help a lot with this
issue.
Taken from https://fontawesome.com/how-to-use/on-the-web/styling/animating-icons
I can't say that I can see the difference which using display: block gives here, perhaps others can spot it or add an explanation of why it might help:
#keyframes circle {
from {transform: rotate(0deg);}
to {transform: rotate(360deg);}
}
div {
padding:0;
margin:0;
}
.container {
position:absolute;
top:50px;
left:50px;
border:1px solid red;
font-size:20px;
}
.inner {
line-height:0;
animation-name:circle;
animation-duration: 1s;
animation-iteration-count: infinite;
}
#block {
display: block;
}
.two {
left: 75px;
}
<link href="https://use.fontawesome.com/releases/v5.7.0/css/all.css" rel="stylesheet"/>
<div class="container"><div class="inner"><i class="fas fa-adjust"></i></div></div>
<div class="container two"><div class="inner"><i class="fas fa-adjust" id="block"></i></div></div>

I analysis that the icon has some unbalance margins, which is creating a little offset when we try to rotate it.
here, I remake the same icon,
check if it works for you.
#keyframes circle {
from {transform: rotate(0deg);}
to {transform: rotate(360deg);}
}
.container {
position:absolute;
top:50px;
left:50px;
border:1px solid red;
font-size:300px;
}
.inner {
padding: 2px;
animation-timing-function: linear;
animation-name:circle;
animation-duration: 1s;
animation-iteration-count: infinite;
}
.rot{
border: 10px solid black;
width: 100px;
height: 100px;
border-radius: 50%;
background-image: linear-gradient(to left,black 0%, black 50%, white 50%,white 100%);
}
<div class="container">
<div class="inner">
<div class="rot">
</div>
</div>
</div>

Prevent from Downloading same file multiple times

I'm using below script to show loading gif while the file is ready to download and then Once it is done , it hides after couple of seconds.
But I Only want to dowanload the file once, but when I click the link it download the same file twice. I found the code somewhere in forums, so I really don't know how to prevent it from running the url twice.
$(".file a").on("click",function(e){
var originalHtml=$(this).html();
$(this).html('<div class="load-container load8"><div class="loader">Loading...</div></div>'); // do your UI thing here
e.preventDefault();
var destination = this.href;
var clickedLink=$(this);
setTimeout(function() {
clickedLink.html(originalHtml);
window.location = destination;
},2500);
$('<iframe>').hide().appendTo('body').load(function() {
window.location =sagar;
}).attr('sagar', sagar);
});
.loader,
.loader:before,
.loader:after {
border-radius: 50%;
width: 2.5em;
height: 2.5em;
-webkit-animation-fill-mode: both;
animation-fill-mode: both;
-webkit-animation: load7 1.8s infinite ease-in-out;
animation: load7 1.8s infinite ease-in-out;
}
.loader {
color: darkblue;
font-size: 10px;
margin: 80px auto;
position: relative;
text-indent: -9999em;
-webkit-transform: translateZ(0);
-ms-transform: translateZ(0);
transform: translateZ(0);
-webkit-animation-delay: -0.16s;
animation-delay: -0.16s;
}
.loader:before,
.loader:after {
content: '';
position: absolute;
top: 0;
}
.loader:before {
left: -3.5em;
-webkit-animation-delay: -0.32s;
animation-delay: -0.32s;
}
.loader:after {
left: 3.5em;
}
#-webkit-keyframes load7 {
0%,
80%,
100% {
box-shadow: 0 2.5em 0 -1.3em;
}
40% {
box-shadow: 0 2.5em 0 0;
}
}
#keyframes load7 {
0%,
80%,
100% {
box-shadow: 0 2.5em 0 -1.3em;
}
40% {
box-shadow: 0 2.5em 0 0;
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<body style="color: black; background-color: #EFF6E4;font-family: myFirstFont; ">
<ol class="tree">
<li>
<label for="folder1">First Semester</label> <input type="checkbox" id="folder1" />
<ol>
<li>
<label for="subfolder11">Classical Mechanics </label> <input type="checkbox" id="subfolder11" />
<ol>
<li class="file">Solutions_to_Problems_in_Goldstein)</li>
<li class="file">Goldstein Solution Chapter 8 Soln</li>
<li class="file">Goldstein Chapter 9 Soln</li>
<li class="file">Numericals Jacobi Angle ( Hints )</li>
<li class="file">Angle Jacobi Numericals ( Complete Solution)</li>
</ol>
</li>
</ol>
</li>
</ol>
</body>
Any help would be really appreciated.

It seems you are calling window.location = destination; (which is triggering the browser to download the file) twice, inside that setTimeout function and after a hidden iframe is loaded, which I think is the correct place.
Just stop calling setTimeout like below:
$(".file a").on("click",function(e){
var originalHtml=$(this).html();
$(this).html('<div class="load-container load8"><div class="loader">Loading...</div></div>'); // do your UI thing here
e.preventDefault();
var destination = this.href;
var clickedLink=$(this);
$('<iframe>').hide().appendTo('body').load(function() {
window.location = destination;
clickedLink.html(originalHtml);
}).attr('src', destination);
});

Getting right position of clicked button (ripple effect)

I have problem with finding the right position of click. I want to make google material design - ripple effect on clicked button. Circle need to be on button not somewhere else. So when you click on button white circle is showing somewhere else not above the wanted button. Where is the mistake i made?
$(function () {
var btnClick, bWidth, bHeight, x, y, posX, posY,d;
$(".btn").click(function (e) {
e.preventDefault();
posX = $(this).offset().left;
posY = $(this).offset().top;
bWidth = $(this).outerWidth();
bHeight = $(this).outerHeight();
d = Math.max(bWidth, bHeight);
$(".btn-over").remove();
if ($(this).find(".btn-over").length === 0) {
$(this).prepend("<span class='btn-over'></span>");
}
// btnClick = $(this).children(".btn-over");
// btnClick.removeClass("animation");
// if (!btnClick.height() && !btnClick.width()) {
// d = Math.max($(this).outerWidth(), $(this).outerHeight());
// btnClick.css({
// height: d,
// width: d
// });
// }
x = e.pageX - posX - bWidth / 2;
y = e.pageY - posY - bHeight /2;
$(".btn-over").css({
width: d,
height: d,
top: y + 'px',
left: x + 'px'
}).addClass("animation");
});
});
nav {
height: 3rem;
background-color: #424242;
color: #fff; }
.menu {
list-style: none;
float: right; }
.menu li {
display: inline-block; }
.btn-sigup {
box-shadow: none;
background-color: #4CAF50; }
.btn-sigup:hover {
background-color: #66BB6A;
box-shadow: none; }
.btn-login {
box-shadow: none;
background-color: transparent; }
.btn-login:hover {
box-shadow: none;
background-color: transparent; }
.btn-over {
display: inline-block;
position: absolute;
background: rgba(255, 255, 255, 0.3);
border-radius: 100%;
-webkit-transform: scale(0);
-moz-transform: scale(0);
-o-transform: scale(0);
transform: scale(0); }
.animation {
-webkit-animation: ripple 0.65s linear;
-moz-animation: ripple 0.65s linear;
-ms-animation: ripple 0.65s linear;
-o-animation: ripple 0.65s linear;
animation: ripple 0.65s linear; }
#-webkit-keyframes ripple {
100% {
opacity: 0;
-webkit-transform: scale(2.5); } }
#-moz-keyframes ripple {
100% {
opacity: 0;
-moz-transform: scale(2.5); } }
#-o-keyframes ripple {
100% {
opacity: 0;
-o-transform: scale(2.5); } }
#keyframes ripple {
100% {
opacity: 0;
transform: scale(2.5); } }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.0/jquery.min.js"></script>
<header>
<nav>
<ul class="menu">
<li>
<button class="btn btn-login">LOG IN</button>
</li>
<li>
<button class="btn btn-sigup">SING UP</button>
</li>
</ul>
</nav>
</header>

There's nothing wrong with your JavaScript, you just need to set the position of the buttons to relative so that the positioning of the .btn-over span is contained within them. You should also consider setting the overflow of the buttons to hidden so that the "ripple" doesn't spill out of them.
$(function(){
var btnClick,bWidth,bHeight,x,y,posX,posY,d;
$(".btn").click(function(e){
e.preventDefault();
posX=$(this).offset().left;
posY=$(this).offset().top;
bWidth=$(this).outerWidth();
bHeight=$(this).outerHeight();
d=Math.max(bWidth,bHeight);
$(".btn-over").remove();
if($(this).find(".btn-over").length===0)
$(this).prepend("<span class=\"btn-over\"></span>");
x=e.pageX-posX-bWidth/2;
y=e.pageY-posY-bHeight/2;
$(".btn-over").css({
width:d+"px",
height:d+"px",
top:y+"px",
left:x+"px"
}).addClass("animation");
});
});
nav{
background-color:#424242;
color:#fff;
height:3rem;
}
.menu{
float:right;
list-style:none;
}
.menu li{
display:inline-block;
}
.btn-sigup{
background-color:#4CAF50;
overflow:hidden;
position:relative;
}
.btn-sigup:hover{
background-color:#66BB6A;
}
.btn-login{
background-color:transparent;
overflow:hidden;
position:relative;
}
.btn-over{
background:rgba(255, 255, 255, 0.3);
border-radius:50%;
display:inline-block;
position:absolute;
transform:scale(0);
}
.animation{
animation:ripple .65s linear;
}
#keyframes ripple{
to{
opacity:0;
transform:scale(2.5);
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<header>
<nav>
<ul class="menu">
<li>
<button class="btn btn-login">LOG IN</button>
</li>
<li>
<button class="btn btn-sigup">SING UP</button>
</li>
</ul>
</nav>
</header>
And here' an alternative implementation, with some extra features, that you can use on any element you wish. To implement it, you'll need to copy the JavaSript and the important stuff from the CSS and then you just give any element you want to apply this effect to a data-ripple-color attribute, which takes a value of any valid CSS color.
To apply this effect to an element every time it is clicked without waiting for the previous animation to complete add a data-ripple-multiple attribute to it with a value of true. See the button element below for an example.
(function(){
if(document.querySelector("[data-ripple-color]")){
var span=document.createElement("span");
span.classList.add("ripple");
document.addEventListener("click",function(event){
var target=event.target,color,data,multi,node,style;
while(!target.dataset.rippleColor&&target!==document.body)
target=target.parentNode;
data=target.dataset;
multi=data.rippleMultiple;
if((color=data.rippleColor)&&(multi||!data.rippleWait)){
if(!multi)data.rippleWait="true";
target.appendChild(node=span.cloneNode(0));
style=node.style;
style.background=color;
style.height=style.width=Math.min(target.offsetHeight,target.offsetWidth)+"px";
style.left=event.pageX-target.offsetLeft+"px";
style.top=event.pageY-target.offsetTop+"px";
setTimeout(function(){
target.removeChild(node);
if(!multi)delete data.rippleWait;
},750);
}
},0);
}
})();
/* Housekeeping */#import url(https://fonts.googleapis.com/css?family=Roboto:400,300,500,700,900);*,*::before,*::after{-moz-appearance:none;-webkit-appearance:none;appearance:none;background:none;background-clip:padding-box;border:0;border-radius:0;box-sizing:border-box;color:rgba(0,0,0,.87);font-family:Roboto,arial,sans-serif;font-size:14px;-webkit-font-smoothing:antialiased;font-style:normal;font-weight:500;line-height:1.2em;list-style:none;margin:0;outline:0;padding:0;-webkit-tap-highlight-color:rgba(0,0,0,0);text-align:left;text-decoration:none;text-indent:0;text-rendering:auto;transition-duration:.2s;transition-property:none;transition-timing-function:cubic-bezier(.4,0,.2,1);}*>*{font-size:inherit;font-style:inherit;font-weight:inherit;}*>*,*::before,*::after{color:inherit;font-family:inherit;line-height:inherit;}
/* The important stuff */
[data-ripple-color]{
overflow:hidden;
position:relative;
}
.ripple{
animation:ripple 1s cubic-bezier(.4,0,.2,1);
border-radius:50%;
display:block;
opacity:0;
position:absolute;
}
#keyframes ripple{
from{
transform:translate(-50%,-50%) scale(1);
opacity:.54;
}to{
transform:translate(-50%,-50%) scale(54);
opacity:0;
}
}
/* Fiddle styles */
a[data-ripple-color],button[data-ripple-color]{
border-radius:3px;
cursor:pointer;
display:block;
font-size:24px;
font-weight:500;
line-height:40px;
margin:0 auto 8px;
padding:8px;
text-align:center;
width:200px;
}
a[data-ripple-color]{
background:#F44336;
color:#fff;
}
button[data-ripple-color]{
background:#3f51b5;
color:#fff;
font-size:24px;
line-height:40px;
padding:8px;
text-align:center;
text-transform:uppercase;
width:200px;
}
figure[data-ripple-color]{
border-radius:3px;
margin:0 auto 8px;
width:200px;
}
p[data-ripple-color]{
line-height:20px;
margin:0 8px 8px;
padding:8px;
}
<button data-ripple-color="#fff" data-ripple-multiple="true">Button</button>
<a data-ripple-color="#303f9f">Link</a>
<figure data-ripple-color="rgb(0,0,0)"><img src="http://placehold.it/200x200.png/e0e0e0?text=Image+%0A+Parent"></figure>
<p data-ripple-color="#616161">Paragrpah</p>

How to center span over image while maintaining mouseover functionality

<div class="pic">
<img src="image.jpg" height="250"/>
<span class="text" style="display:none">text here</span>
</div>
<scriptsrc="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js">
</script>
<script type="text/javascript">
$('img').css('opacity', 0.4);
$('img').next('span.text').show();
$('img').bind('mouseover', function () {
$(this).css('opacity', 1.0);
$(this).next('span.text').hide();
});
$('img').bind('mouseout', function () {
$(this).css('opacity', 0.3);
$(this).next('span.text').show();
});
</script>
I have an opaque image that becomes fully visible on mouseover. I added text with span that would disappear on mouseover and reappear on mouseout similarly to the opaqueness on the image. I tried to center the text with margin-left:auto and margin-right:auto in CSS, but lacked results. Is there a way to center the text while still having the opaqueness and the text disappear on mouseover? Is Javascript the best way to do it?
Thanks

Couldn't you do this with CSS?
body {
text-align: center;
}
.pic {
display: inline-block;
margin: 25px;
border: 1px solid red;
position:relative;
}
.pic img {
display: block;
opacity: 0.4;
transition: opacity 0.5s ease;
}
.text {
opacity: 1;
position:absolute;
top:50%;
left:50%;
transform:translate(-50%,-50%);
transition: opacity 0.5s ease;
}
.pic:hover img {
opacity: 1;
}
.pic:hover .text {
opacity: 0;
}
<div class="pic">
<img src="http://lorempixel.com/output/city-q-c-250-250-7.jpg" />
<span class="text">text here</span>
</div>

CSS3 page loading effect trigger by jquery

Hi friends I am trying to make CSS3 animation which will be trigger by jquery. Ie when the user submit some form I need to display animation (css3) for some duration and redirect it to the next page.
CSS3 animation:
.circle {
background-color: rgba(0,0,0,0);
border: 5px solid rgba(0,183,229,0.9);
opacity: .9;
border-right: 5px solid rgba(0,0,0,0);
border-left: 5px solid rgba(0,0,0,0);
border-radius: 50px;
box-shadow: 0 0 35px #2187e7;
width: 50px;
height: 50px;
margin: 0 auto;
-moz-animation: spinPulse 1s infinite ease-in-out;
-webkit-animation: spinPulse 1s infinite linear;
}
.circle1 {
background-color: rgba(0,0,0,0);
border: 5px solid rgba(0,183,229,0.9);
opacity: .9;
border-left: 5px solid rgba(0,0,0,0);
border-right: 5px solid rgba(0,0,0,0);
border-radius: 50px;
box-shadow: 0 0 15px #2187e7;
width: 30px;
height: 30px;
margin: 0 auto;
position: relative;
top: -50px;
-moz-animation: spinoffPulse 1s infinite linear;
-webkit-animation: spinoffPulse 1s infinite linear;
}
#-moz-keyframes spinPulse {
0% {
-moz-transform: rotate(160deg);
opacity: 0;
box-shadow: 0 0 1px #2187e7;
}
50% {
-moz-transform: rotate(145deg);
opacity: 1;
}
100% {
-moz-transform: rotate(-320deg);
opacity: 0;
};
}
#-moz-keyframes spinoffPulse {
0% {
-moz-transform: rotate(0deg);
}
100% {
-moz-transform: rotate(360deg);
};
}
#-webkit-keyframes spinPulse {
0% {
-webkit-transform: rotate(160deg);
opacity: 0;
box-shadow: 0 0 1px #2187e7;
}
50% {
-webkit-transform: rotate(145deg);
opacity: 1;
}
100% {
-webkit-transform: rotate(-320deg);
opacity: 0;
};
}
#-webkit-keyframes spinoffPulse {
0% {
-webkit-transform: rotate(0deg);
}
100% {
-webkit-transform: rotate(360deg);
};
}
This is html
<div class="circle"></div>
<div class="circle1"></div>
<button class="next" name="submit" id = "submit"></button>
Now when I user click on I need to display this effect for a fraction of time (some thing like alert box I mean while this animation is playing user shouldnt be able to do anything in the rest of the page)

Usually you make the page inaccessible by covering it with an element - an "overlay".
HTML:
<div class="loadingOverlay">
<div class="circle"></div> <!-- it makes sense to put these inside -->
<div class="circle1"></div>
</div>
CSS:
.loadingOverlay {
position: fixed;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
To activate it when the user clicks the submit button, just make it "hidden" by default. And when the user clicks the button, make it "visible". In it's most basic form:
$('#submit').on('click', function () {
$loadingOverlay.css('display', 'block');
});
and the extra needed CSS:
.loadingOverlay {
/* ... */
display: none;
}
On the example I provide below you won't see the animation. The next page, by being blank, just loads too quickly. But you will see it on a "real" website situation.
Here's the live example: http://jsfiddle.net/9H7wf/2/
EDIT:
Max Boll suggested having the "loading effect" happening on the "new" page. It makes sense. But while a new page is being fetched, the "old" one still remains visible until a few key "http" things happen. See http://www.stevesouders.com/blog/2012/12/03/the-perception-of-speed/
So, it does make sense to have it on the "old" page.

I'd suggest you to use jQuery for this.
By default you could display your animation as an overlay (as JOPLOmacedo said).
Then you add the following to your javascript:
$(document).ready(function() {
$('.loadingOverlay').fadeOut();
});
This will show the loading overlay as long as the site needs to load (which you actually wanna show by that loading animation). Once the page is loaded, this javascript will fade it out.
My solution is based on JOPLOmacedo's answer.
EDIT
I just saw your new comment. To show it on button click, you can do it like this:
$(document).ready(function() {
$('.button').click(function() {
$('.loadingOverlay').fadeIn();
});
});
Inside of the click event function you could start an interval to fade it out again after X seconds.

Hi Friends I found a solution to this one Thanx #JOPLOmacedo for helping me to fix this one
$function(){
$('#submit').click(function(){
$('.loadingOverlay').css('display', 'block');
function complete() {
$('.loadingOverlay').css('display', 'none');
}
$('.circle').hide().fadeIn(1000,complete);
$('.cirlce1').hide().fadeIn(1000,complete);
});
}