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Transition between images in vuejs

I want to create a smooth transition between 2 images with a legend. The images come from an object-array of images.
Because works only on single tags and components, I've created a component to define the image+legend.
<transition>
<home-image :slide="slide" :key="slide"></home-image>
</transition>
The classes I define are like this
.v-enter-active,
.v-leave-active {
transition: opacity 2s ease-in-out;
}
.v-leave,
.v-enter-to {
opacity: 1;
}
.v-enter,
.v-leave-to {
opacity: 0;
}
The new image is returned by a method
updateSlide() {
this.slide = this.entries[ Math.floor( Math.random() * this.entries.length ) ];
}
where entries is my array defined in data
this.slide is updated in regular intervals, every 10seconds like this, which is defined in the created() section
this.updateSlide();
this.uSlide = setInterval( this.updateSlide, 10000);
The code works, in the sense that a new image is loaded in this.slide every 10 seconds. However, the transitions work only "half-way".
There is no transition fading out: the "old image" disappears and makes way for the new image fading in.
However, what I'd like is a smooth transition from one to the other.
I've tried more than a couple of ideas including using mode="out-in" and "in-out" but nothing works as I want.
What am I overlooking?

Found out position in v-enter and v-leave had to be set.
Code is now:
.v-leave,
.v-enter-to {
position: relative;
opacity: 1;
}
.v-enter,
.v-leave-to {
position: absolute;
opacity: 0;
}

Css transition manifests only inside timeout function

I've created new div using JavaScript and set its width and height. Immediately after that I need to resize it to 100% width with transition effect. But it manifests only when the styles editing is inside of Timeout function. Without that it just jump to new width.
Css:
#project-detail {
#extend .project-detail-preview;
transition: width 0.25s ease-out, top 0.25s ease-out, left 0.25s ease-out, height 0.25s ease-out;
}
Script:
var detailContainer = document.createElement("div");
detailContainer.id = "project-detail";
detailContainer.innerHTML = previewContent.innerHTML;
detailContainer.style.width = previewWidth;
detailContainer.style.height = previewHeight;
blocksContainer.appendChild(detailContainer);
for (let project of source.projects) {
if(project.id == projectID) {
setTimeout(function () {
detailContainer.style.width = "100%";
}, 1);
}
}

JS is single threaded if you change width to 20 and then to 100, the change to 20 is like if didn't happen. so you need to use a setTimeout() so it first changes it to 20, and "later" it changes to 100

I believe this is because you append the div to the DOM, and immediately (next line of code), you resize it to 100% width.
The problem is that in the page's life cycle, the CSS doesn't have time to catch up and apply between these two lines of code. So, the transition duration is not yet applied, and you already resize the div, so it jumps immediately to 100%.
On the other hand, when you set a Timeout, being asynchronous, the function inside the Timeout is executed at the end of the execution stack, that is, after applying the CSS rules to the newly created elements. You can even set a 0 delay or no delay at all, it will work all the same.

I tried to do things like this with JS, even read bunch of articles about requestAnimationFrame and understood, that things like that better to do with CSS classes. Try to toggle class on action:
for (let project of source.projects) {
if(project.id == projectID) {
detailContainer.className += ' fullwidth-class';
}
}
And add same CSS class:
.fullwidth-class {
width: 100%!important;
}
#project-detail {
animation-duration: 1s;
}

CSS fade out multiple times

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)

Animations in Maquette.js

I've been looking further into using maquette.js as a virtual DOM library.
Looking at the website the library has functionality to support animations when adding, removing, and updating DOM nodes.
But I cannot find any docs or API on what to do do achieve this.
To make it more concrete I have made a small sample below and here.
var isPopupShown = false;
var togglePopup = function(){
isPopupShown = !isPopupShown;
}
var renderMaquette = function () {
return h("div#container", [
h("button", {
onclick: togglePopup
}, ["Click me"]),
isPopupShown ? h("div#popup") : null
]);
}
In the example, clicking the button will open the popup.
What I would like is that the popup would animate a fade-in when the node is added to the DOM and a fade-out when the node is removed from the DOM.

The documentation how animations work is still in progress.
There are currently two ways to do the animation.
Velocity.js
The easiest way is to use a library like velocity.js. For this to work you need to:
Add the velocity.js script to the page
Change h("div#popup") to h("div#popup", {enterAnimation: fadeIn})
Add the following javascript function
Code:
var fadeIn = function(element) {
element.style.opacity = 0;
Velocity.animate(element, {opacity: 1}, 1500, "ease-out");
};
You can view the result here.
CSS Transitions
You can also use CSS transitions. They work the same as angularJS and react. You need to do the following:
Include the css-transitions.min.js script in your page. This
script is also provided by maquette.
Change h("div#popup") to h("div#popup", {enterAnimation: "fadeIn"})
Change the createProjector call to maquette.createProjector(document.body, renderMaquette, {transitions: cssTransitions});
Add the following style declarations to the stylesheet:
Stylesheet:
.fadeIn {
-webkit-transition: 0.5s ease-out opacity;
transition: 0.5s ease-out opacity;
opacity: 0;
}
.fadeIn.fadeIn-active {
opacity: 1;
}
You can view the result here

Creating a vertical scrolling transition effect in Jquery

Wanted to get insight and help advancing a plugin I am beginning to build!
Looking to build the same effect that AKQA.com has, were on page load certain elements transition into place (using translateY of course). However if the elements are in view within the browser window. As you scroll down, other elements have the same effect transitioning up into place and appearing from opacity 0 to 1.
What I am trying to accomplish is getting select elements to transition from opacity 0 to 1 effect translating upwards via scrollonly however when the element is not in-view. If however the elements are already in view (due to page loading right where the elements are) the effect will happen automatically until you scroll down to reveal more elements.
Currently in my JS code I am grabbing the data selector on the elements and applying to each of the elements a transition-delay and a CSS class which suppose to be the class that creates the effect. I have three variables docHeight, offSetter and scrolling that are suppose to help me create the logic behind the scrolling effect but I simply can not wrap my head around creating the effect.
Here is a live demo in my fiddle http://jsfiddle.net/coder101/hYS48/1/
The Hi link is simply for testing to toggle the in-view CSS class I have
Thank you for the help!
Javascript
var loop = function ScrollTransition( ) {
var core = function() {
var i = 100,
dataTheme = $('[data-show*="on-scroll"]').not('in-view'),
docHeight = $( document ).height(),
offSetter = parseInt(dataTheme.offset().top, 10),
scrolling = dataTheme.scrollTop();
// console.log(h);
dataTheme.each(function() {
_this = $( this ),
_this.css("transition-delay", i + "ms", i += 100);
});
},
initializer = function() {
if ( el.hasClass('js') && el.hasClass('no-touch') && el.hasClass('csstransitions') ) {
core();
}
};
return {
init:initializer()
}
};
loop();
// For testing
var divElements = $('article');
var doc = $( '#hit' );
doc.on("click", function() {
if( el.hasClass('js') && el.hasClass('no-touch') && el.hasClass('csstransitions') ) {
divElements.toggleClass('in-view');
}
});
CSS
.base {
width: 300px;
height:300px;
background:blue;
float:left;
}
article {
margin-right:45px;
margin-bottom: 40px;
}
/* starting phase */
.js.no-touch.csstransitions [data-show="on-scroll"] {
opacity:0;
-webkit-transform:translate(0,90px);
-ms-transform:translate(0,90px);
transform:translate(0,90px);
-webkit-transition:opacity .6s .1s, -webkit-transform .6s ease;
transition:opacity .6s .1s, transform .6s ease
}
/* finishing phase */
.js.no-touch.csstransitions .in-view {
opacity:1;
-webkit-transform:translate(0,0);
-ms-transform:translate(0,0);
transform:translate(0,0)
}