Is there a way to use css with an If/else condition? - javascript

I am making a memory game for school.
My issue right now is, you can spam click everything and everything will show.
whenever you have the wrong pair the cards make the class "red" and they turn red in the css code. But you're still able to click the other cards and a few turn back to normal again after 600ms, some just stay and don't turn back.
is it possible to use an if/else condition for css? If there are "red" cards, the pointer event for normal cards are none. You can play the game here and test the issue yourself: https://memory-20.815374.repl.co
Fixing it without If/else is fine too. Using if/else is just the first thing that comes in my head.
here is the code for CSS:
.card.clicked {
background-color: orange;
pointer-events: none;
}
.card.checked {
background-color: lightgreen;
visibility: hidden;
transition: visibility 0s linear 300ms, opacity 300ms;
}
.card.clicked img,
.card.checked img {
opacity: 1;
}
.card.red {
background-color: #f15f5f;
}
.card {
height: 120px;
width: 100px;
background-color: #ff5cbb;
border-radius: 10px;
display: grid;
place-items: center;
cursor: pointer;
transition: 0.3s all ease;
}
Here is the JavaScript code:
} else {
const incorrectCards = document.querySelectorAll(".card.clicked");
incorrectCards[0].classList.add("red");
incorrectCards[1].classList.add("red");
setTimeout(() => {
incorrectCards[0].classList.remove("red");
incorrectCards[0].classList.remove("clicked");
incorrectCards[1].classList.remove("red");
incorrectCards[1].classList.remove("clicked");
}, 600);

Related

How do I animate two letters swapping?

I am trying to make a website where hovering over a misspelling consisting of transposition of two letters corrects it, like so:
var swap = document.querySelector('.swap');
swap.addEventListener('mouseover', swapIn);
swap.addEventListener('mouseout', swapOut);
function swapIn(e) {
e.target.parentNode.firstChild.classList.toggle('shifted-right');
e.target.parentNode.lastChild.classList.toggle('shifted-left');
}
function swapOut(e) {
e.target.parentNode.firstChild.classList.toggle('shifted-right');
e.target.parentNode.lastChild.classList.toggle('shifted-left');
}
body {
font-size: 24px;
}
.swap {
display: inline;
}
span {
-webkit-transition: all 0.3s linear;
-moz-transition: all 0.3s linear;
-o-transition: all 0.3s linear;
transition: all 0.3s linear;
}
.shifted-right {
margin-left: 20px;
color: blue;
}
.shifted-left {
margin-left: -25px;
color: red;
}
E<div class="swap" id="swap"><span class="left-swap" id="ls">q</span><span class="right-swap" id="rs">c</span></div>uis me vivit fortunatior?
However, as you can see, the letters don't swap well, and besides, I don't want to calculate the precise margins for each different letter width.
What's a better approach to doing this?
Switching two letters in the same word can be done by calculating their relative position to their parent with the offsetLeft property.
Subtract the values from each other and use Math.abs to keep the integer a positive number. This number is the distance between the two letters. One letter has to go the entire distance to the left and the other the same distance to the right to switch positions. Set the a CSS Variable with the distance so we can pass the calculation to CSS.
In CSS we can use the :hover pseudo selector to set styles on hover and use the CSS Variable to make the proper transition. And instead of targeting the hover on a letter, target the hover on the entire word.
Instead of margin, use transform; this property does not mess with the layout and will only any manipulate the element that is targeted.
const word = document.querySelector('.word');
const [e, a] = word.querySelectorAll('.letter');
const distance = Math.abs(e.offsetLeft - a.offsetLeft);
word.style.setProperty('--distance', `${distance}px`);
.word {
display: inline-block;
padding: 15px;
position: relative;
font-size: 32px;
background-color: #f7f7f7;
border: 1px dashed #d0d0d0;
border-radius: 3px;
cursor: help;
}
.word .letter {
display: inline-block;
color: red;
transition: color 500ms ease-in-out, transform 500ms ease-in-out;
}
.word:hover .letter {
color: green;
}
.word:hover .letter:first-of-type {
transform: translate(var(--distance), 0);
}
.word:hover .letter:last-of-type {
transform: translate(calc(var(--distance) * -1), 0);
}
<span class="word">
App<span class="letter">e</span>r<span class="letter">a</span>nt
</span>

Making hidden element display itself and then move using transition

How do I make fix this code so the two element first becomes no longer hidden and then moves however much right smoothly using the transition. It works when the element doesn't begin hidden, but when it is, it just jumps to the end spot. How do I make this work without taking out hidden and reducing the elements width to zero.? Thanks.
var one = document.getElementById('one');
var two = document.getElementById('two');
function myFunct() {
two.style.display = 'flex';
two.style.right = '70%';
}
#one {
position: absolute;
width: 300px;
height: 100px;
border: 1px solid red;
}
#two {
position: absolute;
display: none;
min-width: 5px;
height: 100%;
transition: 1.5s;
-webkit-transition: 1.5s;
-moz-transition: 1.5s;
-ms-transition: 1.5s;
background-color: green;
right: 0px;
}
<div id = 'one' onclick = 'myFunct()'>
<div id = 'two'></div>
</div>
Use opacity: 0 first instead of display: none and using translateX instead of right will be better.
I also recommend AnimeJS since it makes animations and transitions a lot easier if you are using a bunch of them.
Try manipulating the visibility property instead of display:
function myFunct() {
two.style.visibility = 'visible';
two.style.right = '70%';
}
#two {
visibility: hidden;
display: flex;
...
}

Trigger opacity transition on mouse in and out

I want to trigger a opacity transition. If an element is hovered by the cursor, the cursor shall fade out, change its background-image and then fade in again. I wanted to achieve that by adding and removing a css class. It's not working, what is wrong?
js fiddle
HTML
<div class="wrapper">
<div class="cursor">
</div>
<div id="grey">
</div>
</div>
CSS
.wrapper {
width: 100%;
height: 100%;
background-color: lightgrey;
padding: 60px;
cursor: none;
}
#grey {
width: 100px;
height: 100px;
background: grey;
}
.cursor {
position: fixed;
width: 20px;
height: 20px;
pointer-events: none;
opacity: 0;
-webkit-transition: opacity .3s; /* Safari */
transition: opacity .3s;
}
.red {
background: red;
opacity: 1;
}
.green {
background: green;
opacity: 1;
}
JS
$('.wrapper').on('mousemove', function(e){
$('.cursor').css('left', e.clientX-10).css('top', e.clientY -10);
if ($.contains($('.wrapper')[0], e.target)){
$('.cursor').removeClass('green').addClass('red');
}else{
$('.cursor').removeClass('red').addClass('green');
}
});
DEMO HERE
Ok, here you go. You need to keep track of 2 things here which you already achieved partially and also wait for fadeOut to complete and add a callback for adding and removing respective class
Whether cursor has entered element
Whether cursor has left element
Below is how you could actually do it.
var entered=false;//global variables to show the position of cursor
var left=false;
$('.wrapper').on('mousemove', function(e){
$('.cursor').css('left', e.clientX-10).css('top', e.clientY -10);
if ($.contains($('.wrapper')[0], e.target)){
if(!entered)
{
//just to do it once and not on every mousemove you need to check here whether
//it has already entered and moving inside the element
entered=true;
left=false;//to check the vice versa operation
$('.cursor').fadeOut('fast',function(){
//callback function after fadeOut completes
$(this).removeClass('green').addClass('red');
}).fadeIn('fast');
}
}else{
if(!left)
{
left=true;
entered=false;
//same goes here too
$('.cursor').fadeOut('fast',function(){
$(this).removeClass('red').addClass('green');
}).fadeIn('fast');
}
}
});
you have to change background color , not opacity ( opacity is always 1 )
CSS
.cursor {
position: fixed;
width: 20px;
height: 20px;
pointer-events: none;
opacity: 0;
-webkit-transition: background-color .3s; /* Safari */
transition: background-color .3s ;
}
.red {
background-color: red;
opacity: 1;
}
.green {
background-color: green;
opacity: 1;
}
So you said your question is wrong, it is "no, I just made it easier for hier, in reality it is an background image" - so you transition between two background-images.
Here is how you do it:
You can not do it with CSS transition in ONE element/div
You will have to make two divs wich one background each
Increase the zIndex of the div you want to fade out in by one
Fade out div, while the new div stays at opacity: 1

Fade effect attribute/function in javascript custom script?

I need to add a fade effect on my javascript function
Javascript
<script type="text/javascript">
window.onload=function() {
loginBtn = document.getElementById('loginBtn');
fader = document.getElementById('login_fader');
login_box = document.getElementById('login_box');
closebtn = document.getElementById('closelogin');
loginBtn.onclick=function(){
fader.style.display = "block";
login_box.style.display = "block";
}
closebtn.onclick=function() {
fader.style.display = "none";
login_box.style.display = "none";
}
}
</script>
HTML
<div id="login_fader"> </div>
<div id="login_box">
<table class="table-login">
<th>Login or Register</th>
<th><a id="closelogin">X</a></th>
<tr>
<td>Login</td>
<td>Register</td>
</tr>
</table>
</div>
CSS
<style type="text/css">
#loginBtn {
float: right;
margin-top: -6%;
cursor:pointer;
}
#login_fader {
background: black;
opacity: .5;
-moz-opacity: .5;
-filter: alpha(opacity=50);
position: fixed;
top: 0;
left: 0;
height: 100%;
width: 100%;
z-index: 5;
display: none;
}
#login_box {
width: 320px;
height: 200px;
border: 1px white solid:
background: #5a5a5a;
position: fixed;
top: 25%;
left: 35%;
z-index: 10;
display: none;
}
.table-login {
background: #FFF;
border-radius: 8px;
box-shadow: 0 0 5px 2px;
opacity: 0.95;
}
#closelogin {
float:right;
cursor:pointer;
}
</style>
Js fiddle
http://jsfiddle.net/U3n4j/
I have tried using the transition properties from css3 and tried applying both to login_box and login_fader.
I found some functions on the net but don't know how to link them to my already made function and i was thinking if there are any properties directly that i can link them to my function.
Proper way to fade in a static box in css3 and js 1.7 ++
This is a example using only webkit and modern javascripts classList.add
but you can add the other prefixes.-moz,-ms,-o
in this example i show only the animation.
css
.box{
width:100%;
height:100%;
position:fixed;
left:0;top:-100%;/*notice TOP -100%*/
opacity:0;
-webkit-transition:opacity 700ms ease,top 0 linear 700ms;/*notice TOP delay*/
background-color:rgba(0,0,0,0.7);
}
.box.active{
-webkit-transition:opacity 700ms ease,top 0 linear 0;
/*top transition not needed but could help to understand*/
top:0;
opacity:1;
}
js
function show(){
box.classList.add('active');
}
function hide(){
box.classList.remove('active');
}
var box=document.getElementsByClassName('box')[0],
button=document.getElementsByTagName('button')[0];
button.addEventListener('click',show,false);
box.addEventListener('click',hide,false);
DEMO
http://jsfiddle.net/RAu8Q/ not working anymore
http://jsfiddle.net/RAu8Q/17/ new syntax 10-2015
if you have any questions just ask.
I can't tell exactly what effect you're trying to achieve, but if you're going to use CSS transitions, then you need to be transitioning between numerical properties. I.e., you can't expect a fade to occur simply by transitioning from display:block to display:none. You'd want to use opacity instead.
First of all, don't try to use css transitions in conjunction with display property, that won't work! Instead, try transitioning other properties. Let's take opacity for instance (we'll simulate display: none/block functionality by setting opacity to 0/1)
Secondly, set the start value for opacity to 0 on the desired HTML element (the one you'd like to animate). Specify which property to animate (opacity in our case):
transition: opacity 1s;
-moz-transition: opacity 1s;
-webkit-transtion: opacity 1s;
When the login button is clicked, set opacity to 1:
loginBtn.onclick=function() {
fader.style.opacity = 1;
login_box.style.opacity = 1;
}
When the close button is clicked, set opacity back to 0:
closebtn.onclick=function() {
fader.style.opacity = 0;
login_box.style.opacity = 0;
}
Link to fiddle.
I believe that what you want to do needs css animations. So just create an animation class that fades out the target element and apply it after the user logs in.
#keyframes fadeOut {
from: {
opacity:1;
},
to: {
opacity:0;
}
}
then use apply it on the class
.fadeOut {
animation:fadeOut 0.25s forwards;
}
EXAMPLE
http://jsfiddle.net/zgPrc/

css for fading overlaid video controls?

In some DVD/Video players, the controls for play/pause/volume/etc are overlaid on top of the video itself in a box. The controls fade in when you move the mouse, and then, after some delay, fades back out (so you can enjoy the video again).
I am wondering -- how to create this effect using CSS? Is there a way to reset the fade-out timer on events other than body mouse move?
Let's say we have the following HTML template:
<div class="player">
<div class="controls">Controls go here</div>
</div>
It is possible if you use CSS transition-delay: http://jsfiddle.net/teddyrised/7sBwA/
.player {
background-color: #333;
position: relative;
width: 100%;
height: 400px;
}
.controls {
background-color: rgba(0,0,0,.5);
border-radius: 5px;
color: #eee;
padding: 1em;
position: absolute;
left: 2em;
right: 2em;
bottom: 2em;
text-align: center;
pointer-events: none;
opacity: 0;
transition: opacity .5s ease-in-out;
transition-delay: 0;
}
.player:hover .controls {
pointer-events: auto;
opacity: 1;
}
.player:not(:hover) .controls {
transition-delay: .5s;
}
However, if you want better browser support, you should use JS instead.
When using jQuery, you can exploit the .delay() method when using jQuery effects, such as .fadeOut() in our example: http://jsfiddle.net/teddyrised/g7kge/
JS:
$(document).ready(function(){
$(".player .controls").hide();
$(".player").hover(
function(){
// Mouse enters. Fade in controls
$(this).find(".controls").fadeIn();
},
function(){
// Mouse leaves. Delay controls fade out by 1000ms
$(this).find(".controls").delay(1000).fadeOut();
});
});
It is possible to control the fade-out timer using CSS with:
-(prefix)-transition: all <duration> ease-out <delay>;
Take a look at this fiddle.

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