I have an HTML, CSS and JavaScript files. The HTML contains three quotes which shuffles every two seconds. I have written the JavaScript code to show these quotes only when the screen width is at most 600px. The problem is that the quote continues to display across every screen width. I've tried using the media query in CSS, but to no avail. What might be the issue? Please, see code below.
HTML Code:
<div class="preNavBar">
<div class="quoteWrapper">
<span class="quote">The roots of education are bitter, but the fruit is sweet. </span>
<span class="quoteAuthor">— Aristotle</span>
</div>
<div class="quoteWrapper">
<span class="quote">To teach is to learn twice. </span>
<span class="quoteAuthor">— Unknown</span>
</div>
<div class="quoteWrapper">
<span class="quote">A person who won't read has no advantage over one who can't read. </span>
<span class="quoteAuthor">— Mark Twain</span>
</div>
</div>
CSS Code:
body {
padding: 0 !important;
margin: 0 !important;
font-size: 16pxm;
background: rgb(53, 54, 58);
}
* {
box-sizing: border-box;
/* margin: 0; */
padding: 0;
}
/* PRE-NAVIGATION BAR */
.preNavBar {
background-color: navy;
color: white;
padding: 10px 30px;
display: grid;
justify-content: center;
}
.preNavBar .quoteAuthor {
font-weight: bolder;
float: right;
}
#media only screen and (min-width: 768px) {
/* .preNavBar .quoteWrapper{
display: none;
} */
}
JavaScript Code:
<script>
let x = window.matchMedia("(max-width: 600px)");
if (x.matches) {
showQuote();
function showQuote() {
let slides = document.getElementsByClassName("quoteWrapper");
let i;
for (i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
let min = 0;
let max = slides.length - 1;
let randNum = Math.floor(Math.random() * (max - min + 1)) + min;
slides[randNum].style.display = "block";
setTimeout(showQuote, 2000); // change every 2 seconds
}
}
</script>
Let's take a look at the very first line:
let x = window.matchMedia("(max-width: 800px)");
You invoke window.matchMedia and store returned value in x.
The important thing here is that x will not change if screen is resized after the moment it was declared.
If you want it to, you'll need a resize event listener.
Also, a possible pitfall here is that depending on where in the document your <script> tag is placed, you might want to wrap all your code into an IIFE to ensure it fires after the document is completely loaded.
That's because you set the variable on start and never change it on resize
let timeout;
function testMatch() {
let x = window.matchMedia("(max-width: 800px)");
if (x.matches) {
function showQuote() {
let slides = document.getElementsByClassName("quoteWrapper");
for (let i = 0; i < slides.length; i++) {
slides[i].style.display = "none";
}
//the min was 0 so it was useless, if you do slides.length-1,
//you wont be able to access the last index
let randNum = Math.floor(Math.random() * slides.length);
slides[randNum].style.display = "block";
//set it so you can clear if user changes to > 600px
timeout = setTimeout(showQuote, 2000); // change every 2 seconds
}
showQuote();
} else if (timeout) {
clearTimeout(timeout);
}
}
testMatch();
addEventListener("resize", testMatch);
Also this could be a lot more efficiently done by using an id to signify which quote is not hidden.
(function () {
const slides = document.getElementsByClassName("quoteWrapper");
let timeout;
function testMatch() {
let x = window.matchMedia("(max-width: 800px)");
if (x.matches) {
function showQuote() {
//the min was 0 so it was useless, if you do slides.length-1,
//you wont be able to access the last index
let randNum = Math.floor(Math.random() * slides.length);
const prev = document.getElementById("current-quote");
if (prev) prev.removeAttribute("id");
slides[randNum].setAttribute("id", "current-quote");
timeout = setTimeout(showQuote, 2000); // change every 2 seconds
}
showQuote();
} else if (timeout) {
clearTimeout(timeout);
}
}
testMatch();
addEventListener("resize", testMatch);
})();
.quoteWrapper {
display: none;
}
#current-quote {
display: block;
}
Related
I'am working on progressbar that change the level when reaching some point.
The code.
I want to change the text under the progressbar when the progressbar reach 100 or above 90.
I could change it once but I want to go to next level, like this.
silver ==> gold ==> diamond ==> and more
const step = 5;
var content=document.getElementById('mylevel').innerHTML;
const updateProgress = () => {
const currentWidth = Number(document.getElementById("progressvalue").style.width.replace( "%", ""));
if (currentWidth>=100) {
return;
}
else {
document.getElementById("progressvalue").style.width = `${currentWidth+step}%`;
}
if (currentWidth > 90) {
document.getElementById("mylevel").textContent = "gold";
document.getElementById("progressvalue").style.width = "0%";
}
if (currentWidth > 90 && content == "gold") {
document.getElementById("mylevel").textContent = "diamond";
document.getElementById("progressvalue").style.width = "0%";
}
}
const restart = () => {
document.getElementById("progressvalue").style.width = "0%";
}
.progress {
background-color: #ededed;
width: 100%;
overflow: hidden;
}
#progressvalue {
height: 40px;
background-color: lightgreen;
width: 0%;
}
<div class="progress">
<div id="progressvalue"></div>
</div>
<p id="mylevel">silver</p>
<br />
<button type="button" onclick="updateProgress()">
Update Progress
</button>
<button type="button" onclick="restart()">
Restart
</button>
When the updateprogress is above 90 the silver change to gold, but I need to change again to diamond when the updateprogress is again above 90.
Am I putting the if condition in a wrong place, I tried many times.
I don't know what I'am missing and am new with JavaScript
I started the code but got help here to make it much better (80% of the code done by
teresaPap thanks)
Update
After closer inspection it is an issue of content not updating you need to put it inside updateProgress() or it will forever remain the initial value.
const step = 5;
const updateProgress = () => {
var content = document.getElementById('mylevel').innerHTML;
//the rest of the code
I do however recommend you to improve your if statements. You only need one if for this task.
A better solution
A better solution would be something like this:
Add a hidden value to keep your level progress
</div>
<p id="hiddenlevel">0</p>
<p id="mylevel">silver</p>
<br />
and css:
#hiddenlevel {
height: 0px;
visibility: hidden;
width: 0%;
}
now that you have a hidden value you can wrap up all future ifs in a single one.
const levels = ["silver", "gold", "diamond"]
var mylevel = Number(document.getElementById("hiddenlevel").innerHTML);
if(currentWidth > 90 && mylevel < levels.length){
document.getElementById("hiddenlevel").textContent = mylevel + 1;
document.getElementById("mylevel").textContent = levels[mylevel + 1];
document.getElementById("progressvalue").style.width = "0%";
}
and just like that you can just add a new level inside the levels array and it will be added without issues.
Update 2
Just noticed I made a mistake!
You don't need a hidden element for this: you might end up having to use hidden elements when using plugins, but it was completely unnecessary here :)
Updated code:
const step = 5;
var mylevel = 0;
const updateProgress = () => {
const currentWidth = Number(document.getElementById("progressvalue").style.width.replace( "%", ""));
if (currentWidth>=100) {
return;
}
else {
document.getElementById("progressvalue").style.width = `${currentWidth+step}%`;
}
const levels = ["silver", "gold", "diamond"];
if(currentWidth > 90 && mylevel < levels.length){
mylevel = mylevel + 1;
document.getElementById("mylevel").textContent = levels[mylevel];
document.getElementById("progressvalue").style.width = "0%";
}
}
const restart = () => {
document.getElementById("progressvalue").style.width = "0%";
}
.progress {
background-color: #ededed;
width: 100%;
overflow: hidden;
}
#progressvalue {
height: 40px;
background-color: lightgreen;
width: 0%;
}
<div class="progress">
<div id="progressvalue"></div>
</div>
<p id="mylevel">silver</p>
<br />
<button type="button" onclick="updateProgress()">
Update Progress
</button>
<button type="button" onclick="restart()">
Restart
</button>
Here we have counter application to increase, decrease and reset the counter by using HTML, CSS, and JavaScript, but I can't getting to do how we can increase the counter and decrease the counter and reset the counter.
When the HTML button element with the id decreaseBtn is clicked,
If the count is odd then decrease the counter value by -1 as shown in the image.
If the count is even then decrease the counter value by -2 as shown in the image.
When the HTML button element with the id increaseBtn is clicked,
If the count is odd then increase the counter value by 10 as shown in the image.
If the count is even then increase the counter value by 5 as shown in the image.
When the HTML button element with the id resetBtn is clicked,
Set counter value as 0.
The Output image is Counter app
let counterElement = document.getElementById("counterValue");
function onIncrement() {
let previousCounterValue = counterElement.textContent;
let updatedCounterValue = parseInt(previousCounterValue) + 1;
if (updatedCounterValue > 0) {
counterElement.style.color = "black";
}
else if (updatedCounterValue < 0) {
counterElement.style.color = "black";
}
else {
counterElement.style.color = "black";
}
counterElement.textContent = updatedCounterValue;
}
function onDecrement() {
let previousCounterValue = counterElement.textContent;
let updatedCounterValue = parseInt(previousCounterValue) - 1;
if (updatedCounterValue > 0) {
counterElement.style.color = "black";
}
else if (updatedCounterValue < 0) {
counterElement.style.color = "black";
}
else {
counterElement.style.color = "black";
}
counterElement.textContent = updatedCounterValue;
}
function onReset() {
let counterValue = 0;
counterElement.textContent = counterValue;
counterElement.style.color = "black";
}
#import url("https://fonts.googleapis.com/css2?family=Bree+Serif&family=Caveat:wght#400;700&family=Lobster&family=Monoton&family=Open+Sans:ital,wght#0,400;0,700;1,400;1,700&family=Playfair+Display+SC:ital,wght#0,400;0,700;1,700&family=Playfair+Display:ital,wght#0,400;0,700;1,700&family=Roboto:ital,wght#0,400;0,700;1,400;1,700&family=Source+Sans+Pro:ital,wght#0,400;0,700;1,700&family=Work+Sans:ital,wght#0,400;0,700;1,700&display=swap");
.counter-value {
font-size: 36px;
font-weight: 900;
}
.button {
color: #ffffff;
background-color: #0967d2;
font-size: 14px;
border-width: 0;
border-radius: 4px;
padding: 10px;
}
<!DOCTYPE html>
<html>
<head> </head>
<body>
<p id="counterValue" class="counter-value">0</p>
<button id="decreaseBtn" class="button" onclick="onDecrement()">DECREASE</button>
<button id="resetBtn" class="button" onclick="onReset()">RESET</button>
<button id="increaseBtn" class="button" onclick="onIncrement()">INCREASE</button>
</body>
</html>
Expected Output is
Counter app
I am new to js so may not be best solution.
let count = 0;
const counter = document.getElementById("counterValue");
function isEven(num) {
return num % 2 ? false : true;
}
function onDecrement() {
if (isEven(count)) {
count = count - 2;
} else {
count = count - 1;
}
counter.textContent = count;
}
function onReset() {
count = 0;
counter.textContent = count;
}
function onIncrement() {
if (isEven(count)) {
count = count + 5;
} else {
count = count + 10;
}
counter.textContent = count;
}
.counter-value {
font-size: 36px;
font-weight: 900;
}
.button {
color: #ffffff;
background-color: #0967d2;
font-size: 14px;
border-width: 0;
border-radius: 4px;
padding: 10px;
}
<!DOCTYPE html>
<html>
<head> </head>
<body>
<p id="counterValue" class="counter-value">0</p>
<button id="decreaseBtn" class="button" onclick="onDecrement()">DECREASE</button>
<button id="resetBtn" class="button" onclick="onReset()">RESET</button>
<button id="increaseBtn" class="button" onclick="onIncrement()">INCREASE</button>
</body>
</html>
The other users in the comments have explained about how to check whether the count is odd or even.
I wanted to add an answer that approaches the code from a slightly different angle, and which I often find very useful.
Instead of picking up the textContent of the counter element and parsing it to a number we maintain one number variable.
We give each button a data-type attribute, and a button container one handler function that is called immeditately.
The reason for this is so we can use a technique called a closure - a function returned from another function but maintains references to the variables that were declared before it was returned.
We can intitialise count.
We return the closure.
When any button is clicked the event bubbles up the DOM and is captured by the listener in the container (this is called event delegation.
We check the data type. We update count based on the type and whether the count is odd or even.
Finally we update the counter element text.
// Cache the elements
const counterElement = document.querySelector('#counterValue');
const container = document.querySelector('#container');
// Add a listener to the container
container.addEventListener('click', handleClick(), false);
// Small function to check whether the
// count is odd or even
function isEven(count) {
return count % 2 === 0;
}
// Initialise the count variable
function handleClick(count = 0) {
// Return a new function (the closure)
// as the function that will be called when
// the buttons are clicked
return function(e) {
// Get the button type from the clicked button
const { type } = e.target.dataset;
// Now just use `switch` to update the count
switch(type) {
case 'decrease': {
if (isEven(count)) {
count = count - 2;
} else {
count = count - 1;
}
break;
}
case 'increase': {
if (isEven(count)) {
count = count + 5;
} else {
count = count + 10;
}
break;
}
default:
case 'reset': count = 0; break;
}
// Finally update the counter element
counterElement.textContent = count;
}
}
.counter-value {font-size: 36px; font-weight: 900; }
.button {color: #ffffff; background-color: #0967d2; font-size: 14px; border-width: 0; border-radius: 4px; padding: 10px;}
<p id="counterValue" class="counter-value">0</p>
<div id="container">
<button data-type="decrease" class="button">DECREASE</button>
<button data-type="reset" class="button">RESET</button>
<button data-type="increase" class="button">INCREASE</button>
</div>
I am trying to make a game that tests how many times you can click on a div in a minute. I can not get my countdown to function properly. My countdown should stop at 0, but instead it keeps going after reaching 0. My code is below. Any ideas?
let div = document.getElementById("div");
let score = document.querySelector("h3");
let time = document.querySelector("span");
var jsTime = 60;
var jsScore = 0;
alert("Click inside the box as many times as you can in one minute. \n Ready?");
var clicker = div.addEventListener("click", function() {
jsScore++;
score.innerHTML = jsScore;
}, 1);
var i = 60;
setInterval(function() {
if (i > 1) {
jsTime--;
time.innerHTML = jsTime;
} else {
removeEventListener(clicker);
}
}, 1000);
#div {
text-align: center;
width: 100px;
height: 100px;
background: black;
color: white;
}
#container {
display: inline-block;
}
<h1>Click inside the box as many times as you can in one minute.</h1>
<br>
<div id="container">
<h2>Time:</h2><span>60</span>
<h2>Score:</h2>
<h3>0</h3>
</div>
<div id="div"></div>
You're decreasing the jsTime as long as i is > 1, which it will always be, since you never decrease the value of i. I think you meant to use jsTime in the conditional instead. Renaming it to something that gives it some context may make it easier to follow. Ex remainingTimeSeconds. See the revised code below.
let div = document.getElementById("div");
let score = document.querySelector("h3");
let time = document.querySelector("span");
var jsTime = 60;
var jsScore = 0;
alert("Click inside the box as many times as you can in one minute. \n Ready?");
var clicker = div.addEventListener("click", function() {
jsScore++;
score.innerHTML = jsScore;
},1);
setInterval(function() {
// As long as there is time left, keep decreasing it, and update the time element's innerHTML with the new current time.
if (jsTime > 1){
jsTime--;
time.innerHTML = jsTime;
} else {
removeEventListener(clicker);
}
},1000);
I have made custom carousel (for learning) on this web page. Carousel has 2 buttons (next and previous) and dots (each dot is 1 picture). It all works fine, but there is one problem. I want to make automatic loop carousel (to loop through images in interval of X seconds). Now i am using setInterval(nextImgShow, 2000);. But every time i click on either button (next, previous, dots) the interval changes.
Example: I have interval of 2s. If i click on a button when 1,5s has passed, the next image will only show for 0,5s. If i click it right away at 0,5s, the next image will show for 1,5s.
I already try to fix this with clearInterval();, but it does not change a thing. I also try to use clearInterval(); and than set interval again setInterval(nextImgShow, 2000); (on every button), but no luck.
I also try to use setTimeout(); but again nothing.
My wish is: If interval is 2s, when i click on either of buttons, i want to reset/set my interval back to 2s. So that every image is displayed for 2s, no matter when the button was clicked.
Can anyone help me solve this?
Below is JavaScript code and link to my web page, so you can see.
LINK: Link to page, so you can see demo
// navigation selection
const navigation = document.querySelector("ul.navigation");
const navigationToggleButton = document.querySelector(".navigation-toggle");
const navigationList = document.querySelectorAll(".navigation a");
// background image selector
const backgroundImgDiv = document.querySelector(".bg");
const previousImgBtn = document.querySelector(".prev");
const nextImgBtn = document.querySelector(".next");
const imgDotBtn = Array.from(document.querySelectorAll(".dot"));
const arrImg = ['url("img/0.jpg")', 'url("img/1.jpg")', 'url("img/2.jpg")', 'url("img/3.jpg")'];
const dot0 = document.querySelector(".dot-0");
const dot1 = document.querySelector(".dot-1");
const dot2 = document.querySelector(".dot-2");
const dot3 = document.querySelector(".dot-3");
let startImgIndex = 0;
let currentIndex = 0;
// navigation functions
function toggleNav() {
navigation.classList.toggle("active");
}
function navLink() {
navigation.classList.remove("active");
}
// background image functions
function nextImgShow() {
startImgIndex++;
if (startImgIndex === arrImg.length) {
startImgIndex = 0;
}
currentIndex = startImgIndex;
backgroundImgDiv.style.backgroundImage = arrImg[startImgIndex];
toggleDotActive(currentIndex);
}
function previousImgShow() {
startImgIndex--;
if (startImgIndex === -1) {
startImgIndex = (arrImg.length - 1);
}
currentIndex = startImgIndex;
backgroundImgDiv.style.backgroundImage = arrImg[startImgIndex];
toggleDotActive(currentIndex);
}
function dotBtnNavigate() {
if (this.classList.contains("dot-0")) {
dotBtnSet(0);
} else if (this.classList.contains("dot-1")) {
dotBtnSet(1);
} else if (this.classList.contains("dot-2")) {
dotBtnSet(2);
} else if (this.classList.contains("dot-3")) {
dotBtnSet(3);
}
}
function dotBtnSet (number) {
backgroundImgDiv.style.backgroundImage = arrImg[number];
startImgIndex = number;
currentIndex = number;
toggleDotActive(currentIndex);
}
function toggleDotActive(currentIndex) {
switch(currentIndex) {
case 0:
dot0.classList.add("dot-active");
dot1.classList.remove("dot-active");
dot2.classList.remove("dot-active");
dot3.classList.remove("dot-active");
break;
case 1:
dot0.classList.remove("dot-active");
dot1.classList.add("dot-active");
dot2.classList.remove("dot-active");
dot3.classList.remove("dot-active");
break;
case 2:
dot0.classList.remove("dot-active");
dot1.classList.remove("dot-active");
dot2.classList.add("dot-active");
dot3.classList.remove("dot-active");
break;
case 3:
dot0.classList.remove("dot-active");
dot1.classList.remove("dot-active");
dot2.classList.remove("dot-active");
dot3.classList.add("dot-active");
break;
default:
break;
}
}
// navigation events
navigationToggleButton.addEventListener("click", toggleNav);
navigationList.forEach(item => item.addEventListener("click", navLink));
// background image event
nextImgBtn.addEventListener("click", nextImgShow)
previousImgBtn.addEventListener("click", previousImgShow);
imgDotBtn.forEach(btn => btn.addEventListener("click", dotBtnNavigate));
// for touch devices (carousel navigate)
const gestureZone = document.querySelector('.img-wrap');
let touchstartX = 0;
let touchstartY = 0;
let touchendX = 0;
let touchendY = 0;
// for touch devices function (carousel navigate)
function handleGesture() {
if (touchendX <= touchstartX) {
nextImgShow();
}
if (touchendX >= touchstartX) {
previousImgShow();
}
}
setInterval(nextImgShow, 2000);
// navigation events
navigationToggleButton.addEventListener("click", toggleNav);
navigationList.forEach(item => item.addEventListener("click", navLink));
// background image event
nextImgBtn.addEventListener("click", nextImgShow);
previousImgBtn.addEventListener("click", previousImgShow);
imgDotBtn.forEach(btn => btn.addEventListener("click", dotBtnNavigate));
// for touch devices events (carousel navigate)
gestureZone.addEventListener('touchstart', function(event) {
touchstartX = event.changedTouches[0].screenX;
touchstartY = event.changedTouches[0].screenY;
}, false);
gestureZone.addEventListener('touchend', function(event) {
touchendX = event.changedTouches[0].screenX;
touchendY = event.changedTouches[0].screenY;
handleGesture();
}, false);
You should be passing the interval ID (returned from setInterval) to the clear interval function. For example:
let myIntervalID = setInterval(nextImgShow, 2000);
Then you can clear the interval doing clearInterval(myIntervalID) just make sure the variable myIntervalID is in scope when you clear it.
Your clearInterval wasn't actually clearing the interval so you ran into this problem. Once you correctly clear the interval (like above) and call the interval again (kinda like resetting the interval) your image will show for the full interval
You should assign the setInterval to a variable and use clearInterval when the user clicks on one of the buttons to change the image and then set the interval again.
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
var change;
var i = 1;
var numOfImages = 3;
$(document).ready(function(){
document.getElementById("img1").classList.add("active");
change = setInterval(function(){
changeImage();
}, 2000);
});
function changeImage(){
var elem = document.getElementById("img"+i);
elem.style.display = "none";
i++;
if(i>numOfImages){
i = 1;
}
var elemToBeShown = "#img"+i;
$(elemToBeShown).show();
}
</script>
<style>
.images{
width: 50%;
margin-left: 40%;
}
#img2{
display: none;
}
#img3{
display: none;
}
.button{
border-radius: 50%;
height: 25px;
width: 25px;
margin: 0px 15px 15px 15px;
background-color: green;
display: inline-block;
}
.button:hover{
cursor: pointer;
background-color: blue;
}
</style>
</head>
<body>
<div class="images">
<img id="img1" 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" width="125" height="125"/>
<img id="img3" src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRkoieaGln2U5aMZQZibEmbva3LVpVVOw-GbcizRKfmZzog4B5lnw" width="125" height="125"/>
</div>
<div style="width: 100%; text-align: center; margin-top: 25px;">
<div class="button" id="button1"></div>
<div class="button" id="button2"></div>
<div class="button" id="button3"></div>
</div>
<script>
$('.button').click(function(e){
var buttonid = $(this).attr('id');
var imgid = parseInt(buttonid.substring(6, buttonid.length), 10);
if(i!=imgid){
clearInterval(change);
document.getElementById("img"+i).style.display = "none";
document.getElementById("img"+imgid).style.display = "block";
i = imgid;
change = setInterval(function(){
changeImage();
}, 2000);
}
});
</script>
</body>
</html>
I'm trying to write my own animations using JavaScript.
I wrote a function for fadeIn() as below, it changes the display property followed by a change in value of opacity. But it doesn't seem to be working.
What am I doing wrong?
function fadeIn(obj, defDisp) {
obj.style.opacity = 0;
obj.style.display = defDisp;
var opVal = 0;
while (opVal < 1) {
obj.style.opacity = opVal;
opVal += 0.1;
}
}
defDisp = Default value for display property
Without a timing interval, this will likely execute too fast for you to see it. The while loop, without a timeout feature, will execute in far less than a second, and you won't see it happen. It's like asking a computer to count to 10, it will do it in less than a millisecond.
Try using a setTimeout
http://www.w3schools.com/jsref/met_win_settimeout.asp
while(opVal < 1) {
setTimeout(function(){
obj.style.opacity = opVal;
opVal += 0.1;
}, 3000);
}
Alter the timer (3000 in this case) to something that makes your fade work for you. Every 1000 is a one second and your loop runs 10 times, so in this case it would be 30 seconds, likely too slow.
I would probably stick with a CSS transition however, as they tend to render better on all browsers.
var el = document.getElementById('fadein');
fadeIn(el);
function fadeIn(ele, defDisp) {
ele.style.opacity = 0;
ele.style.display = defDisp;
var opVal = 0;
var t = setInterval(function(){
if(opVal >= 1){
clearInterval(t);
}
ele.style.opacity = opVal;
opVal += 0.1;
}, 100);
}
#fadein{ background: #ccc; border:1px solid #ddd; padding: 10px }
<div id="fadein">Hello</div>
Use a function that calls itself after a delay.
function fadeIn(obj, defDisp) {
obj.style.opacity = 0;
obj.style.display = defDisp;
var last = +new Date(); // Keep track of the time to calculate the opacity
var fadeStep = function () {
obj.style.opacity = +obj.style.opacity + (new Date() - last) / 800;
last = +new Date();
if (+obj.style.opacity < 1) {
setTimeout(fadeStep, 16);
}
};
fadeStep();
}
var el = document.getElementById('box');
fadeIn(el, 'block');
#box{ padding: 1em; background: #009afd; color: #ffffff; display: none; }
<div id="box">Hello</div>
If you want the fade to be faster, replace 800 by anything lower and vice-versa.
Because html render and for loop use the same thread, so when you doing the for-loop,you can't see any changes until the function complete. You have to use a setTimeout or setInterval (or requestAnimationFrame which is introduced from html5) so you browser can have the control to change the properties on the page:
You can see a example from the snippet, although the second that use a setTimeout is faster than the first one, which use for loop, the first one will not change its color as browser not able to change color during for-loop.
And if you choose to use requestAnimationFrame like I do in the snippets, you can have a smooth animation while the time can also be controlled precisely.
function fadeIn() {
this.style.opacity = 0;
this.style.display = 'block';
var opVal = 0;
console.time("count");
while(opVal < 1) {
this.style.opacity = opVal;
opVal += 0.000001;
}
console.timeEnd("count");
}
// Accept target as the target to apply anim, time is total anim time in ms.
function fadeInAlt(target, time) {
var opacity = 0;
var last = window.performance.now();
console.time("count2");
target.style.opacity = opacity;
target.style.display = 'block';
var fadeInFunc = function(timeStamp) {
if (opacity < 1) {
// Define the change by passed time.
var timePassed = timeStamp - last;
opacity += timePassed / time;
target.style.opacity = opacity;
last = timeStamp;
requestAnimationFrame(fadeInFunc);
} else {
console.timeEnd("count2");
return;
}
};
requestAnimationFrame(fadeInFunc);
}
var div = document.getElementById('test');
div.onclick = fadeIn;
var div2 = document.getElementById('test2');
div2.onclick = function() {
fadeInAlt(this, 3000);
};
#test {
background-color: red;
width: 30px;
height:30px;
}
#test2 {
background-color: blue;
width: 30px;
height:30px;
}
<div id="test"></div>
<div id="test2"></div>