I am attempting to play a video then have the div fade out to 0 opacity at sixty seconds before completion. The issue I'm having is that in removing of the animation on the div which allows the video to fade in at the beginning in effect switches off the div, (the video). What I want to achieve is a fadeout at 60 seconds. What I hope to achieve is remove id animation without affecting video playback, then add timecode which will fade out video / (div) 60 seconds before the end. I may not have not explained this very well see the JSfiddle.
var callOnce = true;
function aperture(){
if ((media.duration - media.currentTime) < 60)
if (callOnce) {
sync();
callOnce = false;
}
}
function sync(){
"use strict";
var media = document.getElementById("media");
media.classList.add("timecode");
media.classList.remove("animation");
}
setInterval(aperture, 100);
JSFiddle: https://jsfiddle.net/oytqq0jb/
Your time detection code is correct, but the way you're handling the animation is wrong. Here I show what sync() and its CSS animation should look like:
function sync () {
var video = document.querySelector('.video');
video.classList.add('anim-fade-out');
}
setTimeout(sync, 2000);
.video {
width: 160px;
height: 90px;
background: black;
}
#keyframes fade-out {
to {
opacity: 0;
}
}
.anim-fade-out {
animation: fade-out 1s forwards;
}
<div class="video"></div>
Add the animation only when you want to start the fade out, there's no need to mess with running/paused. Once you add the class, the forward keyword will keep the last state of the animation when it's done animating, which in this case is opacity: 0
Related
I have an image tag where in every 3 seconds it changes to a different image and I want to add into it an animation style where every time the image switch, a css animation keyframe will take effect. It seems that I cant figure out how to apply the animation in javascript. Here's what Ive tried so far:
My javascript,:
let indexObj = {
imageChange: document.getElementById("imageChanger"), //id of the image tag
imagePath: ["images/Ps_Logo.png", "images/Pencil.png"],
indexPos: 0,
ChangeImage: () => {
setInterval(() => {
indexObj.imageChange.src = indexObj.imagePath[indexObj.indexPos];
indexObj.imageChange.classList.add("imageToChange"); // imageToChange is the name of the css class where the animation is written on.
indexObj.indexPos++;
if (indexObj.indexPos === 2) {
indexObj.indexPos = 0;
}
}, 3000)
}
}
indexObj.ChangeImage();
Here is my css code. The class and animation keyframe:
.imageToChange {
height: 55px;
width: 70x;
border-radius: 20%;
animation-name: animateImage;
animation-duration: .5s;
animation-fill-mode: forwards;
}
#keyframes animateImage {
0% {
margin-top: 2px;
opacity: 0;
}
50% {
margin-top: 7;
}
100% {
opacity: 1;
margin-top: 9px;
}
}
The animation only runs the first time you add the .imageToChange class (and it does work with your code).
You need to either remove the class after the animation or switch to a different class each time you iterate an image.
Have you tried adding and removing (toggling on and off) on your animateImage class? Consider adding the animation class and then toggling it after the animation is completed.
You could use the addClass("imageToChange") and removeClass("imageToChange") jQuery methods: https://api.jquery.com/addClass/
Or using Vanilla JS toggle a class: https://www.w3schools.com/howto/howto_js_toggle_class.asp
Just be sure to retrigger the event the desired number of times.
I have a html page that has a simple CSS animation, nothing fancy just a background transition between two colors.
Currently I cannot seem to figure out how to get the system time and fire the animation trigger at a specified time
I want to load it in chrome on several mobile devices. Get the system time and then when a preset time is reached the animation plays on a loop.
I made an example using animation-play-state according to second. This adaptable any specific time.
const div = document.querySelector("div");
function getTime(){
let date = new Date();
let second = date.getSeconds();
console.log(second);
if(second == 10){
div.style.animationPlayState = "running";
}
}
setInterval(function(){
getTime();
},1);
div {
width: 300px;
height: 100px;
background-color: red;
animation:animate 2s linear infinite;
animation-play-state:paused;
}
#keyframes animate {
from {
background-color: red;
}
to {
background-color: blue;
}
}
<div></div>
I'm making a website which will let you update an SQL table, and I want to add some sort of feedback when a button is clicked. I have made an invisible button (opacity=0) which lies to the right of each row as a status. I made this JS fade() function to set the opacity to 1, then slowly bring it back to 0, so a message pops up then fades away.
function fade () {
var invis = document.getElementById("invis".concat(num.toString()));
if(invis.style.opacity > .990) {
invis.style.opacity = (invis.style.opacity) - .001;
setTimeout(fade, 50);
} else if(invis.style.opacity > 0) {
invis.style.opacity = (invis.style.opacity) - .05;
setTimeout(fade, 50);
}
}
The trouble is, since webpages are single-threaded, any other action will interrupt the animation and leave behind a half-faded status. So that's no good. So now I am trying to set up the invisible buttons to change class when a new row is updated. The new class looks like this:
.invisible_anim {
...
opacity: 0;
animation:trans 3000ms;
}
#keyframes trans {
0% {
opacity: 1;
}
50% {
opacity: 1;
}
This works fine, except it only works once. From here I cannot get the animation to play a second time. I have tried changing the class back to "invisible" then "invisible_anim" with no luck. I also can't use JQuery or Webkit. I'm wondering if there's some flag you can set for a button without actually clicking on it so I can reset the class when I need to? Or even some way to thread my JS function so I can stick with that.
If you would like to play the animation multiple times (see docs here: https://developer.mozilla.org/en-US/docs/Web/CSS/animation), if you would like to play it twice only.
so this:
.invisible_anim {
...
opacity: 0;
animation:trans 3000ms;
}
#keyframes trans {
0% {
opacity: 1;
}
50% {
opacity: 1;
}
would turn to
.invisible_anim {
...
opacity: 0;
animation:trans 3s 2 ;
}
#keyframes trans {
0% {
opacity: 1;
}
50% {
opacity: 1;
}
EDIT:
Apparently the requirements are different than what I thought. Instead the solution seems to be to key off the animation event located at https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_animations and then when that animation done do what you need to do: so in JS-only
var e = document.getElementById("watchme");
e.addEventListener("animationend", listener, false);
function listener(){
//do what you need to do here
}
Just be careful, the reason for this is that most browsers have different "animationend" events that fire at different times. So definitely will need to be tested in different browsers to make sure that the animation event is firing at the right time. There's a post at (https://css-tricks.com/controlling-css-animations-transitions-javascript/) that details some of the issues you might encounter.
Have you considered using the CSS property "transition"? JavaScript has an event listener called "transitionend" that can trigger when your transition has ended, which you can use to reset the button.
First set the area for your alert button with the id invis.
CSS:
#invis {
opacity: 1;
transition: opacity 3s;
}
Then in JavaScript, generate your button and its content, which will appear at opacity 1, then transition to opacity 0. Your addEventListener will trigger when the animation is done, remove the button and reset the opacity for the next trigger.
JavaScript:
var invis = getElementByID("invis");
function fade() {
var button = document.createElement("button");
invis.appendChild(button);
invis.style.opacity = ("0");
invis.addEventListener("transitionend", function(){
invis.removeChild(button);
invis.style.opacity = ("1");
});
}
You can add the fade() function to your EventListener for the user "click."
This is my first time answering on StackOverflow, I hope this helps!
You need to start transparent then show then hide:
#keyframes trans {
0% {
opacity: 0;
}
50% {
opacity: 1;
}
100% {
opacity: 0;
}
}
Then simply add your class (remove after the 3000ms time period)
I'm playing a CSS animation with infinite iterations, until some point I pausing it from java script (using technique from here).
At later time I resume the animation. The problem is that the animation is restarting from the beginning point, and not from the last point before the pause.
Does there is a way to continue the animation from the pause point, without jumping to the start?
Edit: Between the pause and resume I also change the animation duration, see the demo.
You should see some 'jumping'. Need explanation about this strange behavior.
http://jsfiddle.net/zhang6464/MSqMQ/
Just switch animation-play-state css property to be paused, according to the article you supplied(http://css-tricks.com/restart-css-animation/
I've just started to dig into JS myself, so there are surely better ways to do this, but how about something like this - Demo (Unprefixed version).
CSS
#box {
position: relative;
top: 20px;
left: 20px;
width: 100px;
height: 100px;
background: #393939;
animation: move 2s linear infinite;
animation-play-state: running;
}
#keyframes move {
100% {
transform: rotate(360deg);
}
}
JS:
(function () {
var box = document.getElementById('box');
box.onclick = function () {
if (box.style.animationPlayState === "paused") {
box.style.animationPlayState = "running";
} else {
box.style.animationPlayState = "paused";
}
};
})();
Based on if the animation is running or paused I change the animation-play-state onclick.
EDIT: Added the css code.
I need help with an animated PNG in Javascript.
I found how to animate a PNG background with Javascript here on Stack Overflow. But my problem is that I only need the animation onmouseover and onmouseout. And the animation should play only once, not in a loop, so when the user moves the mouse over a div the the animation in the background should play once and stop at the last frame, but when the user goes off the div, a reverse animation should play once and stop at the last (first) frame. The script I found here is:
The style:
#anim {
width: 240px; height: 60px;
background-image: url(animleft.png);
background-repeat: no-repeat;
}
The HTML:
<div id="anim"></div>
Javascript:
var scrollUp = (function () {
var timerId; // stored timer in case you want to use clearInterval later
return function (height, times, element) {
var i = 0; // a simple counter
timerId = setInterval(function () {
if (i > times) // if the last frame is reached, set counter to zero
i = 0;
element.style.backgroundPosition = "0px -" + i * height + 'px'; //scroll up
i++;
}, 100); // every 100 milliseconds
};
})();
// start animation:
scrollUp(14, 42, document.getElementById('anim'))
I hope anyone can help me, Thank you
To stop the animation after the first set of frames you do want to change the if condition to not reset the counter to zero but instead to clear the interval and stop it from reoccuring.
To only let it play when you enter an element you can attach the animation function as an event listener and play the whole thing in reverse with another function that you plug into your onmouseout event.
Depending on your target browser and since your question is fairly vague I can recommend two alternatives to you:
Use jQuery animate (all browsers, include ref to jquery)
//Animate to x,y where x and y are final positions
$('#anim').mouseenter(function(e) {
$(this).animate({background-position: x + 'px ' + y + 'px'}, 4200);
})
//Do same for mouseleave
Use a css3 animation (using -webkit browser here)
<style>
#-webkit-keyframes resize {
100% {
height: 123px;
}
}
#anim:hover {
-webkit-animation-name: resize;
-webkit-animation-duration: 4s;
}
I would choose option 2 if you are doing mobile development or can choose only css3 capable browsers.