I have a CSS element/ball which I am moving to new coordinates on click.
This works, however the transition I am applying does not seem to take affect.
The ball jumps to the new location. I want it to slowly animate/transition/move to the new coordinates.
What am I doing wrong?
.ball {
width: 30px;
height: 30px;
border-radius: 50%;
background-color: #FF5722;
position: absolute;
// d.style.transition = "all 1s ease-in";
transition: all 3s ease-in-out;
// -webkit-transition: all 1s ease-in-out;
// -moz-transition: all 1s ease-in-out;
// -o-transition: all 1s ease-in-out;
// -ms-transition: all 1s ease-in-out;
}
handleClick = (e) => {
console.log('ball clicked');
var d = document.getElementById('ball');
console.log('d', d);
d.style.x = 12 + "px";
d.style.top = 341 + "px";
d.style.transition = "all 1s ease-in";
}
Thanks
You have to assign a default value for x and top or you are trying to transition from nothing.
P.S. It seems your CSS is selecting elements with the CLASS ball instead of an element with the ID of ball. Use #ball instead of .ball in CSS. (credit to jaromanda-x)
window.onclick = (e) => {
console.log('ball clicked');
var d = document.getElementById('ball');
console.log('d', d);
d.style.x = 12 + "px";
d.style.top = 341 + "px";
d.style.transition = "all 1s ease-in";
}
#ball {
width: 30px;
height: 30px;
border-radius: 50%;
background-color: #FF5722;
position: absolute;
// d.style.transition = "all 1s ease-in";
transition: all 3s ease-in-out;
// -webkit-transition: all 1s ease-in-out;
// -moz-transition: all 1s ease-in-out;
// -o-transition: all 1s ease-in-out;
// -ms-transition: all 1s ease-in-out;
x:0; /* default value */
top:0; /* default value */
}
<div id="ball">
It seems like there are a few things that need to be corrected;
The ball is styled by the .ball class in your CSS where as the ball element is being accessed via an id, which suggests a potential problem. Is the ball class being applied to the element with id ball?
the x property on the style object should be replaced with the left property to ensure horizontal movement of the ball element
ensure that the transition is assigned to the target elements prior to any CSS properties being modified
Here's an example demonstrating these corrections:
const handleClick = (e) => {
console.log('ball clicked');
const ball = document.getElementById('ball');
/* Setting random coordinates to demonstrate transition */
ball.style.left = Number.parseInt(Math.random() * 200) + "px";
ball.style.top = Number.parseInt(Math.random() * 200) + "px";
}
document.addEventListener("click", handleClick);
#field {
position: relative;
width: 100%;
height: 100%;
}
/* Corrected to id selector with # rather than class selector
with . */
#ball {
position: absolute;
width: 30px;
height: 30px;
border-radius: 50%;
background-color: #FF5722;
position: absolute;
/* Assigning transition behavior which is applied during
property changes */
transition: all 3s ease-in-out;
}
<div id="field">
<div id="ball"></div>
</div>
Hope that helps
Related
I am trying to make a message appear if the user doesn't scroll for specific amount of time and then make the text fade out as soon as the user scroll. What I have tried so far is not working.
I am looking for vanilla javascript solutions only.
thank you for your help.
// make scroll button appear ---------------
var scrollText = document.getElementById("scrollMsg");
function showMsg() {
scrollText.className = "show";
}
setTimeout(showMsg, 2000);
// make scroll button fadout ---------------
function scrollHide() {
var scrollText2 = document.querySelector("#scrollMsg.show");
var scrllTPosition = scrollText2.getBoundingClientRect().top;
var screenPosition = window.innerHeight / 0.5;
if (scrllTPosition < screenPosition) {
scrollText2.classList.add("scrollHide");
}
}
window.addEventListener("scroll", scrollHide);
#scrollMsg {
height: auto;
position: sticky;
bottom: 175px;
z-index: 1;
opacity: 0;
-webkit-transition: opacity 0.7s;
-moz-transition: opacity 0.7s;
transition: opacity 0.7s;
}
#scrollMsg.show {
opacity: 1;
-webkit-transition: opacity 0.7s ease-in-out;
-moz-transition: opacity 0.7s ease-in-out;
transition: opacity 0.7s ease-in-out;
}
#scrollhide {
opacity: 0;
-webkit-transition: opacity 0.7s ease-in-out;
-moz-transition: opacity 0.7s ease-in-out;
transition: opacity 0.7s ease-in-out;
}
<p id="scrollMsg">scroll</p>
I've added some large divs to allow us to scroll through the document.
// make scroll button appear ---------------
var scrollText = document.getElementById("scrollMsg");
window.addEventListener('scroll', (e) => {
console.log('user scrolled!')
scrollText.style.opacity = 0
});
#scrollMsg {
opacity: 1;
transition: opacity 1s;
}
<div style="height:100px"></div>
<p id="scrollMsg">scroll</p>
<div style="height:4000px"></div>
I am starting to use the IntersectionObserver API and could create some basic animations, which includes hiding and appearing of elements. However, once a person wants to scroll back to the top, the elements which disappeared by one of the triggers are not getting visible again.
My Solution so far
So I thought I might create another test variable within the intersection observer callback function (the stepI and stepII variable in my code), which checks if the callback function was previously triggered. If so, instead of disappearing the elements, let them appear again.
My current problem
So let's say a background image (id="hiddenImg") should appear when the first text block (id="I") passes the 50% border of the viewport and it disappears when the second text block (id="II") enters this area. Even though the image is getting visible again when scrolling back up, if the user does not scroll back completely (so that the second text block goes out of the viewport) and then scrolls back to the bottom, the disappearing trigger of that second text block is not called. This would mean that the background image would stay visible, which it shouldn't.
Here is the js part:
var stepI = false;
var stepII = false;
// list of options
let options = {
rootMargin: '0px 0px -50%' //WHEN reaching half of the viewport
};
// instantiate a new Intersection Observer
"use strict";
var intersectionObserver = new IntersectionObserver(function (entries, observer) {
entries.forEach(function (change) {
if (change.isIntersecting) {
if (change.target.id == "I") {
$("#hiddenImg").removeClass("hidden_img");
$("#hiddenImg").addClass("visible_img");
stepI = true;
observer.unobserve(change.target);
}
if (change.target.id == "II") {
if (stepII == false) {
$("#hiddenImg").removeClass("visible_map");
$("#hiddenImg").addClass("hidden_map");
stepII = true
} else {
$("#hiddenImg").removeClass("hidden_map");
$("#hiddenImg").addClass("visible_map");
stepII = false;
}
}
}
});
},options);
// list of paragraphs
let elements = document.querySelectorAll(".stepper");
for (let elm of elements) {
intersectionObserver.observe(elm);
}
Here is my complete code:
<html>
<head>
<!-- Load the polyfill. -->
<script src="/js/intersection-observer.js"></script>
<script src='https://unpkg.com/intersection-observer#0.5.0/intersection-observer.js'></script>
</head>
<body>
<style>
.intro-imgs {
display: block;
margin: 0 auto; /* Will not center vertically and won't work in IE6/7. */
left: 0;
right: 0;
position: fixed;
position: expression(fixed);
}
.hidden_img {
visibility: hidden;
opacity: 0;
-ms-transform: scaleX(0); /* IE 9 */
-webkit-transform: scaleX(0); /* Safari 3-8 */
-o-transform: scaleX(0);
-moz-transform: scaleX(0);
transform: scaleX(0);
-webkit-transition: visibility 0s 0.5s, opacity 0.5s linear, -webkit-transform 0.5s;
-moz-transition: visibility 0s 0.5s, opacity 0.5s linear, -moz-transform 0.5s;
-o-transition: visibility 0s 0.5s, opacity 0.5s linear, -o-transform 0.5s;
transition: visibility 0s 0.5s, opacity 0.5s linear, transform 0.5s;
}
.visible_img {
visibility: visible;
opacity: 1;
-ms-transform: scaleX(1); /* IE 9 */
-webkit-transform: scaleX(1); /* Safari 3-8 */
-o-transform: scaleX(1);
-moz-transform: scaleX(1);
transform: scaleX(1);
-webkit-transition: opacity 0.5s linear, -webkit-transform 0.5s;
-moz-transition: opacity 0.5s linear, -moz-transform 0.5s;
-o-transition: opacity 0.5s linear, -o-transform 0.5s;
transition: opacity 0.5s linear, transform 0.5s;
}
.stepper{
max-width: 70rem;
margin: 550px auto 600px auto;
width: 90%;
background-color: rgba(248, 248, 248, 0.95);
font-family: "Helvetica";
font-size: 17px;
line-height: 26px;
padding: 15px;
}
</style>
<!--HTML-->
<div class="headline">
<img id="hiddenImg" class="hidden_img intro-imgs" src="https://image.shutterstock.com/image-photo/funny-portrait-hero-260nw-410898763.jpg" >
</div>
<div id="I" class="stepper">
<p>Lorem Ipsum</p>
</div>
<div id="II" class="stepper">
<h1>THE HEADLINE</h1>
</div>
<!-- SCRIPT-->
<script>
var stepI = false;
var stepII = false;
// list of options
let options = {
rootMargin: '0px 0px -50%' //WHEN reaching half of the viewport
};
// instantiate a new Intersection Observer
"use strict";
var intersectionObserver = new IntersectionObserver(function (entries, observer) {
entries.forEach(function (change) {
if (change.isIntersecting) {
if (change.target.id == "I") {
$("#hiddenImg").removeClass("hidden_img");
$("#hiddenImg").addClass("visible_img");
stepI = true;
observer.unobserve(change.target);
}
if (change.target.id == "II") {
if (stepII == false) {
$("#hiddenImg").removeClass("visible_map");
$("#hiddenImg").addClass("hidden_map");
stepII = true
} else {
$("#hiddenImg").removeClass("hidden_map");
$("#hiddenImg").addClass("visible_map");
stepII = false;
}
}
}
});
},options);
// list of paragraphs
let elements = document.querySelectorAll(".stepper");
for (let elm of elements) {
intersectionObserver.observe(elm);
}
</script>
</body>
I need to chain two animations in my interface HTML/CSS on user event (here just a click on the document). The first animation start correctly, but when I want to restart the second animation nothing move ?
I know if i remove the .rotaiotn class and with a timeout put other animation class for the element, the second animation start from the first position of the element.
I want to know if exist a solution to start the second animation from the position of the blue ball after the first animation ?
document.addEventListener('click', startAnimation, false);
var isFisrtAnim = false;
function startAnimation(evt) {
var elt = document.querySelector('#blue_ball');
if (!isFisrtAnim) {
elt.setAttribute('class', 'rotation');
} else {
elt.setAttribute('class', 'rotation2');
}
elt.addEventListener("animationend", animationAtEnd, false);
}
function animationAtEnd(evt) {
evt.preventDefault();
isFisrtAnim = !isFisrtAnim;
var elt = evt.target;
// todo here get new position of elt to start another animation
// from the new position after first animation
var new_margin_top = window.getComputedStyle(elt).getPropertyValue('margin-top');
var new_margin_left = window.getComputedStyle(elt).getPropertyValue('margin-left');
console.log('At end new margin-top : ' + new_margin_top + ' - new margin-left : ' + new_margin_left);
// positions are the same of start element ? they are not modify ?
}
#circleNav {
background: rgba(215, 229, 231, 0.4) !important;
margin-top: 100px;
margin-left: 120px;
border-radius: 50%;
width: 335px;
height: 335px;
border: 2px solid #0e6694;
}
img {
max-width: 100%;
}
#blue_ball {
position: absolute;
margin-top: -350px;
margin-left: 165px;
width: 70px;
height: 70px;
border: none;
z-index: 5;
transform-origin: 120px 180px;
}
.rotation {
-webkit-animation: rotation 3s linear;
animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards !important;
}
#-webkit-keyframes rotation {
from {
-webkit-transform: rotate(0deg);
}
to {
-webkit-transform: rotate(240deg);
}
}
.rotation2 {
-webkit-animation: rotation 3s linear;
animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards !important;
}
#-webkit-keyframes rotation2 {
from {
-webkit-transform: rotate(240deg);
}
to {
-webkit-transform: rotate(360deg);
}
}
<h2>
CLICK ON THE BODY TO START ANIMATION
</h2>
<h4>
When the Blue ball stop click an other time to start second animation, but don't work ?
</h4>
<div id="circleNav"></div>
<div id="blue_ball">
<a href="#">
<img id="btn_menu" src="http://mascaron.net/img/mini_rond_logo.png">
</a>
</div>
smaple code on jsfiddle
thanks in advance.
Just one question, in css:
.rotation2 {
-webkit-animation: rotation 3s linear;
animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards !important;
}
should not be:
.rotation2 {
-webkit-animation: rotation2 3s linear; /* <----- here, rotation2
animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards !important;
}
In js part, why not use elem.classList https://developer.mozilla.org/fr/docs/Web/API/Element/classList to manipulate css class property.
I have a header that changes size when a user scrolls past a certain point via JavaScript.
When a user scrolls beyond 50px, the class .smaller is added to the header, which affects the child elements, including the logo.
However, when the logo DIV element is resized, the quality of the image seems to change; the edges seem much more jagged and sharper.
This is how it looks normally:
And scrolled:
Here is the CSS:
div#header div.logo {
width: 400px;
height: 90px;
margin: 5px;
background: url(../img/logo.png) no-repeat center center;
background-size:contain;
float:left;
padding:0 !important;
-webkit-transition: all 0.3s;
-moz-transition: all 0.3s;
-ms-transition: all 0.3s;
-o-transition: all 0.3s;
transition: all 0.3s;
}
div#header.smaller div.logo {
width:262px;
height:40px;
-webkit-transition: all 0.3s;
-moz-transition: all 0.3s;
-ms-transition: all 0.3s;
-o-transition: all 0.3s;
transition: all 0.3s;
}
Relevant JavaScript:
window.onload = init();
function init() {
//header resize on scroll
window.addEventListener('scroll', function(e){
var distanceY = window.pageYOffset || document.documentElement.scrollTop,
shrinkOn = 50,
header = document.querySelector("#header");
if (distanceY > shrinkOn) {
classie.add(header,"smaller");
} else {
if (classie.has(header,"smaller")) {
classie.remove(header,"smaller");
}
}
});
}
Why is there such a noticeable change in image quality, and how can this be avoided?
The image got blurry when navigator resize your image on the fly. SVG image will not blur your logo.
e.g. virtuehost.net/clients/go2markets check this site and try to resize this logo.
I have a header that appears when the page scrolls down. I am trying to add css transitions to make it fade in and out because I've read that using javascript for fading is not as efficient.
.header-wrapper {
top:0;
left:0;
right:0;
position: fixed;
display:none;
height: 60px;
border-top: 1px solid #000;
background: red;
z-index: 1;
}
.header-wrapper.active {
display:block;
}
.header {
background-color:#000;
height:80px;
}
Here is the js fiddle
$(window).scroll(function () {
var y = $(window).scrollTop();
// if above 300 and doesn't have active class yet
if (y > 300 && !$('.header-wrapper').hasClass('active')) {
$('.header-wrapper').addClass('active');
// if below 300 has still has active class
} else if(y <= 300 && $('.header-wrapper').hasClass('active')) {
$('.header-wrapper').removeClass('active');
}
});
Transitions are added with the css3 property transition.
One common reason for confusion: you can only transition properties that accept numeric values. Thus, you can't transition between display: block and display: none.
However you can transition between opacity: 0 and opacity: 1 with:
transition: 0.5s opacity
That would look something like this:
.bottomMenu {
...
opacity: 0;
transition: 0.5s opacity;
...
}
.bottomMenu.active {
opacity: 1;
}
For your particular case, I might recommend transitioning the height between 0 and 60px.
For that you can use:
transition: 0.5s height
So:
.bottomMenu {
...
height: 0;
transition: 0.5s height;
...
}
.bottomMenu.active {
height: 80px;
}
To animate the opacity the element must be visible. So remove the display:none and make it fully transparent (opacity:0). You can then use CSS transitions to animate the opacity when the classname changes:
.bottomMenu {
...
display:block;
opacity: 0;
transition: opacity .25s ease-in-out;
-moz-transition: opacity .25s ease-in-out;
-webkit-transition: opacity .25s ease-in-out;
}
.bottomMenu.active {
opacity:1
}
http://jsfiddle.net/oL9ro4gL/6/
Furthermore, you're not restricted to just animating the opacity:
.bottomMenu {
...
transition: all .25s ease-in-out;
}
.bottomMenu.active {
opacity:1;
height: 60px;
background-color: blue;
transform:rotate(180deg);
color:white;
font-size:40px;
etc...
}
http://jsfiddle.net/oL9ro4gL/8/
Unfortunately, you can't animate the display property. See this question and its suggestions for workarounds.