I want to attach 2 event handlers to one button to start and stop an animation respectively. I'm trying to use a boolean value to test if the animation is already running or not so the right event handler is triggered. i.e. if the animation is not running the boolean is false so the run animation event handler will trigger. As soon as I try to add either or both of these handlers the code breaks and the animation won't run. I've not tried using 2 event handlers on an element before and have seen little about it online so I'm not sure if I'm going about this the right way.
How can I attach these handlers to start and stop the animation ?
<div id='robotCont'></div>
<button id='animeBtn'>start/stop animation</button>
div#robotCont {
width:125px;
height:160px;
border:1px solid #22e;
background-image:url("images/robot.jpg");
background-repeat: no-repeat;
background-position: 0px 0px;
}
var robotSwitch = false;
document.getElementById('animeBtn').onclick = function() {
if(robotSwitch == false) {
runningRobot();
} else {
stopRobot();
}
}
var decrement = 0;
function runningRobot() {
var robotCont = document.getElementById('robotCont');
if(decrement < -1900) {
decrement = 0;
}
robotCont.style.backgroundPosition = decrement+ 'px 0px';
decrement -= 120;
timer = setTimeout(runningRobot,100);
robotSwitch = true;
}
function stopRobot() {
clearTimeout(timer);
}
what about this:
var animate = false
timer;
document.getElementById('animeBtn').onclick = function() {
animate = !animate;
if(animate) {
runningRobot();
} else {
stopRobot();
}
}
var decrement = 0;
function runningRobot() {
var robotCont = document.getElementById('robotCont');
if(decrement < -1900) {
decrement = 0;
}
robotCont.style.backgroundPosition = decrement+ 'px 0px';
decrement -= 120;
timer = setTimeout(runningRobot,100);
}
function stopRobot() {
clearTimeout(timer);
}
Related
I have a circular image I want to spin with a button click and stop with a different button click.
The spin() function works, but the stop() does not because the values die outside of the spin() function (correct me if I'm wrong). How should I solve this? I'm open to using the same button to spin and stop, but my if else statement produces the same result - spinning the image works, but I can't stop it.
Another unintended bug is that if I click on the spin button more than once, the spinning gets faster.
Here's my code:
var spinImage;
function spin(){
spinImage = document.getElementById('spinImage'), degree = 0;
setInterval(function() {
spinImage.style.transform = "rotate(" + ++degree + "deg)";}, 1);
}
function stop(){
clearInterval(spinImage);
}
I need to stick to plain javascript and use the setInterval/clearInterval methods.
the value you are looking for is the return value of setInterval:
var intervalId;
function spin() {
var spinImage = document.getElementById('spinImage');
var degree = 0;
intervalId = setInterval(function() {
spinImage.style.transform = 'rotate(' + ++degree + 'deg)';
}, 1);
}
function stop() {
clearInterval(intervalId);
}
You need to get the id when initializing setInterval (here store in spin variable). That variable will have reference to setInterval so that you can clear it up using stop function.
Another unintended bug (faster spinning on consecutive clicks) is due to the fact that, previous setInterval id is not cleared and new one is created. So, the number of times you click; you will have that many setIntervals. To avoid it, you need to clear up the existing id and then re-initialize with the new set interval.
Have fixed the code. Please see:
var spinImage;
var spin;
function spin(){
spinImage = document.getElementById('spinImage');
degree = 0;
if(spin) stop();
spin = setInterval(function() {
spinImage.style.transform = "rotate(" + ++degree + "deg)";
}, 1);
}
function stop(){
clearInterval(spin);
}
Hope it helps. Revert for any doubts/clarifications
You need to remember the interval id, so that you can stop it.
let intervalId = null;
function spin() {
spinImage = document.getElementById('spinImage'), degree = 0;
intervalId = setInterval(function() {
spinImage.style.transform = "rotate(" + ++degree + "deg)";
}, 1);
}
function stop() {
clearInterval(intervalId);
}
ES6 Class
You can encapsulate this logic into a reusable class object i.e. ImageSpinner.
const main = () => {
const spinner = new ImageSpinner('#spinImage');
addEventListeners('.btn-toggle', 'click', (e) => {
spinner.toggle();
let attr = `data-text-${spinner.isRunning() ? 'off' : 'on'}`;
e.currentTarget.textContent = e.currentTarget.getAttribute(attr);
});
addEventListeners('.btn-reset', 'click', (e) => {
spinner.reset();
let btn = document.querySelector('.btn-toggle');
btn.textContent = btn.getAttribute('data-text-on');
});
}
class ImageSpinner {
constructor(selector, rate) {
/* #protected */ this.image = document.querySelector(selector);
/* #protected */ this.rate = rate;
/* #private */ this.__intervalId = null;
/* #private */ this.__degree = 0;
}
/* #public */ isRunning() {
return this.__intervalId != null;
}
/* #public */ reset() {
if (this.isRunning()) this.stop();
this.__degree = 0;
this.__rotate();
}
/* #public */ start() {
if (!this.isRunning()) {
this.__intervalId = setInterval(() => { this.update() }, this.rate);
} else {
console.log('Already running...');
}
}
/* #public */ stop() {
if (this.isRunning()) {
clearInterval(this.__intervalId);
this.__intervalId = null;
} else {
console.log('Not currently running...');
}
}
/* #public */ toggle() {
this.isRunning() ? this.stop() : this.start();
}
/* #protected */ update() {
this.__degree = (this.__degree + 1) % 360;
this.__rotate();
}
/* #private */ __rotate() {
this.image.style.transform = "rotate(" + this.__degree + "deg)";
}
}
/*
* Can either be an object of event handlers,
* or an event name followed by a function.
*/
function addEventListeners(elementsOrSelector, events) {
((els) => els.forEach(el =>
(typeof events === 'string' && arguments.length > 2)
? el.addEventListener(arguments[1], arguments[2])
: Object.keys(events)
.forEach(name => el.addEventListener(name, events[name]))))
(Array.from((typeof elementsOrSelector === 'string')
? document.querySelectorAll(elementsOrSelector)
: elementsOrSelector.entries
? elementsOrSelector
: [elementsOrSelector]));
}
main(); // Execute main function
body {
background: #222;
padding: 1.25em;
}
img {
border: 2px dotted white;
margin-left: 0.5em;
}
.btn-wrapper {
margin-top: 1.75em;
}
.btn-toggle {
display: inline-block;
width: 64px;
cursor: pointer;
}
<img id="spinImage" src="https://lh5.googleusercontent.com/-ajlbNdBMWwA/AAAAAAAAAAI/AAAAAAAAAAo/ND2LpoxaqAQ/photo.jpg?sz=96" alt="" width="96" height="96"/>
<div class="btn-wrapper">
<button class="btn btn-toggle" data-text-on="Start" data-text-off="Pause">Start</button>
<button class="btn btn-reset">Reset</button>
</div>
<!DOCTYPE html>
<head>
<title>Spin</title>
</head>
<body>
<button id='spinStart'>Start</button>
<button id='spinStop'>Stop</button>
<script>
var spinning = false;
var handle;
var counter = 0;
// Add click event listener to the start button
window.document.getElementById('spinStart').addEventListener("click", start);
// Add click event listener to the stop button
window.document.getElementById('spinStop').addEventListener("click", stop);
function start() {
if(spinning === true) {
console.log('spinning already')
// Do nothing here as it's already spinning.
spinning = !spinning;
}
if(spinning === false) {
// Not spinning here, so we have to init the setInterval
handle = setInterval(() => {
console.log(counter);
counter++;
}, 1000);
spinning = !spinning;
}
}
function stop() {
//We only want to stop the spinner if it's actually spinning
if(spinning === true){
console.log('clearing the interval now!');
clearInterval(handle);
}
}
</script>
</body>
</html>
Substitute your code as fits.
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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Ncrco/4z90jaUalSPo/Cgo4Yr7X/ACbmqQIGoMg9fwBVwtPM7M7Rvzd+XVKzxPhPaRB6SicP8Gt50g3mTM+gjqvN2yoNsQAbOBzTM5g4CIbG3c721WOIaSc2g2AOhgNk31gD1V6NMNLgXSC0XbDvERIBM23nqNFvUptMAWAm5Mzy7HQI4Rt2wRZhqM1YE8wQC6GgGZA8l67APbTpZ3nK0CS42EA328oXm+FFn6jK7PdpgtAdeLAg7df9oP2l4gXRSafA3XbMdienJKy5fhY5NGU5Sovxbj5rv/6YjZpdBsOQ5oGnh3akG5N9ATvB31WXDcMXSRMi7SBm8W08hO69dR4c4O97VLGw2XGA1gBBG9vwKbx1LKueR/2+gyTUdIXYHBzHkYO8cvX5po3h8zEgX3+UrBnGKNOG02uqkA5f2tvykTe2y0qYTEYkeNzQIn3bTlgbZm6+qvjNf0i39wXHcQo0xDR713IHK3zd9khw9VzajnVARnuJMAHNzOosWr1dH2bHfTpyn+Uj9paTGkUWmXWc865RBhvfeOgUnlRdc72ul9w4tdGWKaJjp/P9JTiGeJM2Ee7bOoEG0WGnmhvd5pcszr40F9Qo6B20lvlsALamZmdIEbb+q2p0v77BahpaeRG9jzHmvY/H4o82YUqhBtor4skhptppqQCTr6FFVMIWta4kEPBIg3EGDO421j5LHGzDZIMEhschqdNCTPminFpVZid9AzQo4wugLhXukaC4jVDEI2tRMZuaDcuH5NubbCiyB6iqVFPYdD5j1eVgCrgrtqZA0aZlenWuspVJXnMzjY/wuKTKjWleVo1CnWCqKiE7IM+FLY9pLdoQ2GcjWBMOZLTOtat6bVVrVwVYWC+zx/t3Qy1GPAHiEOPVsxHkV5pi9f7btL6bSNGul3mIXlKBAInmJHMTdYtyPpPAleBfY2dQaWF7XAZcoLSfE5xmS0clbLAAve4OluymPNPOTTBDTpJnvC47EFwEx4RAtty67+qdqymN9huAJaQ6AYuA67SRbSb6rVz2hpmQ60BsZS3VwN7XiNVSlUa67Zbka1pBcDmJJkt/N1V7ZBMRlEuPnA0FpkBNj0e/uDYb/wCw1JIhpb3lDGmMwc4xBzTIBkXHzRuGaXZoEhvicRGmgt3J9eiE4jRFxM9oIJ6eUfNJnFcW0gl2dqcZcHuewh9RxJe9zG3LvitEHVDYjiTnuHv6j6nQEQOw+EeQQtXCkIc04K5GXLmWmv8AwZGMfQ1/+cawRRohp0zvPvHdwIgH1QFPFvD/AHge4PNy4OId66rDIo5inllyydt9fsFSGNfiuJqfFXqH/kWjzhVp0/dlubUmTPUWPUIKm10pjWwxgFxBdIDYuIiZlV+Pc7nTte2C9aB6r75R5lNMLRFpBDSQCYJj+4ul1PDGfy6Z4ao6GsLvDMtBgDMYEk/dX+MpW3JAS+xo/Dt0zifHIcC0eEeG+5N7LENMTFp1i3OPoj64aco8Lc1y58fEJBAI0bolrqlumsdeyqlSBReIE6TbnJF/LUIWs6StK9S97mBBGmgj5IV7lNlmgkWLlwXMKgk6LuWFLkzUa3QzqUrc0oxmHi4TDC4mbFdxTQk5IRyxsng5QlTESiIqUbqLmvHIs5IYAqwKzULl0eRJRvKgas2FbhHHYD0daEfhqsIFq1Dk2LoTNWekweIlOMIZXjcBiIdC9XgaohURlaOX5OLixk+wSvGV4RlauIXmuL4i8ArXpCsGPlKivEMWXNLeYIXmG2KbkoLEsBMjzQKe9na8WofKcZhs2hB8JdrEdENTMkA2ki/Ja4xmVxy6WiLoSqYTMk0v2LI7HOCoSKpY4HLBi1xPOeQNxOizrvGU6m21gDI9f7SejXgiTAm6YMrai92xbc639PkixZ4zWjXFo34W9uYhxdEQcoDjBzQI3vCpXdOtyTBOpgfnyWWBdBcBcmALTry5FEClmLogQC65DTDfO7uiZB3Ex6ZSgPe5g4y5v+R1btc77QhMThptpyVqzixzXtmR6EciihjKT7yGndrjoe51SnwlcJ/7QW+0KCADDrHnsVZ1Ec+yYvwBrGWw7nlIt9lSlh2hvw6HUa9o/lJ/DO2qVeme5mdGkTFpdMRBm15RD25j0GgXaJLSHMdBgkkEgtmQWyd4+q2wzd1XCHoEGe2COi0w5AJzNzCHACctyPCfI3VX+J8AjlcwPMoghhLcgcPCM0kOl98xEbLfZ5mWOc4NbABiRoATmEyefRLXMedk04iMoa0ggnxXEW/aRzm/ogqtX6X7pOZJvbYSBwwjVdoYYuMmwW+FMuk6D59Cis4lRTp9MXPI1pFWUABAWNWmi5WdQIJRVCFJ2LXiFo2vNipXCDcVLKTg9FKXJBJaurFldREpwfs2mGEKsLchVypjQlM40LUFUhQIk6BezVpUL1mSqyicjKNhUTfh3EjokjWyV6XhGBZE7p2Dk2T+TwUdhzXucEi4o0hy9SylCXcT4dnVU42tEGHKoz30eaqkwshh3HReip8LGiY0eHtA0U7wNvbKn5cY9HmsLwuo4RtyKZ0fZtp+IJ3TytQeO40GaGU5RjFbE/ics3UTtL2XoAeJgK85xjAjD1HXIaSDSy3kH4hP7SEbU9qXGwCqzD1MSCcxBiW9FkZxb+UqxSyQd5Ho83SqFrpGhsexTZ8EABrWlrYcQT4iJvffsk2Nw7qbi14gj59ua34bxBvhY4RFmuGpvMO+gWYs8Yz4S9nSatWgt1IkOMaAT02CW1sJunIotIkuvsN//wBco1CNZg3M8NQOptcPEcs5m9BvCpyYY5FTMUqFWG4VV917wN8IF7xqToN1ak61wDY6315dUx/RuaHMZWe1juYIkayW9UufiK+VzSacBoaJaM0TPg5FeS4KkjLbOYqoDAgAgBtgB4W843mbqPr5G9do5/wsKVMgFzpNrnrbX1WbjmP8rHN19wkktEoWLS4SJkjmdYPdG06wa4uIgAuMAkRrYHVDteQA2bTmubDa4Up4N1VpANpv5f7QuXCOuwZSS3IAxGOc92ZxJsA2TMNGgHRdw9N1Q9N+ydYT2faLvKvxENa3KwQoOGRq5sU/Ki3xgLa9QCwEALNlRYlSVO57DUVQYKi46ohBUXDUXviGcC1dyCeVq9yxIUuWVsfBUUUXYXEgaeidTVMi3WLiuxJI5ibK5FUhbBVehaCTMlxRxWZJS2w0jRok2XouH5mtEJRw7DEm69PQo5QOSr8eL7IvLyL9Ibh3khX92UC3HtaYlFPxrSNVbRzJQkvRZtJSrVDRqhamLAFiEix9eo462S5zURmPC5vYbjsdMwV5zFOLitnPcTCPwnDyVFJvI6OjBRwqwXA8PnVMsRjTQbAR9LDimJK83x/Gh5geac0sWO/YMJPNPfQsx+LNZxLvJAFkIjKumlK5juTuXZ1YNRVIo3GVAIDvoVvS43iAQTUc8CwDyX23AJuEPUYBzlYkI5TywaqT/kZSZ6E+1Gac1IjYQ8vgDYZlKXF6BJztqRlMZQJz7b6LzsLoamx87OtPZnCJviMQ52p8hoE0wvGvd4c0DTDpuHcvuUvwuHnlpN10tE9EcXkheRvbBlxfZocSXxDYjU/ZOMBXgQk7SNrIijUhejmk5XJk+Zc1Q+dXsl2KuuNrKr3SnSnaJIQ4sBqU0NUKOqoKqFDkRbBmOZVLlxyqpHJlCQVg6GcgL1+F9mm5ZjVeQ4XiMlQHZfUOG1w9gI5LqeDGEoXWzm+dknBquhAPZlnJdXoXuuorfhx+hD+IyfU8E51liXKKLnzZ0YonvFV1RRRLcmMpGbTJher4Xw2mW3EqKKzxEmm2SedJxiqAOKPLKjWsH+k7pVpYAVFE7H+pkuVflxYrxWDkzKwc12xUURyQUJugd+YbqtNrnGAVFFLJboov5bGeGwAFymdBvJRRPhFIgnJy7F3tFjYbAXkHOUUUflSfOjreJFLHo5Ks0qKKayphDYOoVH4Zh2jsoomdoVbT0Z/pG8yuvDYiFFEt66Dtvsyc5Z51FEiUmMSLsctmOUUTIMGSCGvV866oqUxDRm9yGqriiCQcAV4WZUUUMlspRVew9lOLH4CooqvBm45aXsR5cFLG7PUPkqKKLtnBP//Z" 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>
My task:
Run setInterval loop when I hover the current block, for example #main
When I hover on some children element of #main, setInterval has to be paused
After when I leave children element of #main, and return my mouse focus back to #main, setTimeOut should run again. here is screen http://joxi.ru/L215V3qh65weW2
My code:
let num = 0;
var timer = function() { // auto click
{ num >= $(`.the_wrap_graf`).children().length-1 ? num = 0 : num++ }
$(`.year-wrap:eq(${num}) .q`).click()
}
var timerID = null // name of interval
$('.the_wrap_feed').hover(function (ev) { // hover run loop #main
timerID = setInterval(timer, 3000);
}, function (ev) { // mouseleave kill loop
clearInterval(timerID)
})
$(`.q`).mouseenter(function(e) { // kill loop when hover square
clearInterval(timerID)
})
If I add callback to $(.q), it breaks down. How can I do it?
You can't pause an interval timer. You can only cancel it and start a new one.
Re the requirement, I think I'd probably use mouseenter and mouseleave (which you're already doing, using hover) and track whether the cursor is in #main or a child:
var timer = 0;
var timerValue = 0;
var inMain = 0;
var inChild = 0;
function showTimer() {
$("#timer").text(
timer ? "Running: " + timerValue : "Not running"
);
}
function updateTimer() {
if (inMain && !inChild) {
if (!timer) {
timer = setInterval(tick, 100);
}
} else {
if (timer) {
clearInterval(timer);
timer = 0;
}
}
}
function tick() {
++timerValue;
showTimer();
}
showTimer();
$("#main")
.hover(
function() {
++inMain;
updateTimer();
},
function() {
--inMain;
updateTimer();
}
);
$("#main .child")
.hover(
function() {
++inChild;
updateTimer();
},
function() {
--inChild;
updateTimer();
}
);
#main {
border: 1px solid #aaa;
padding: 8px;
}
.child {
border: 1px solid #ddd;
margin: 8px;
}
<div id="timer"></div>
<div>
Not in main
<div id="main">
In main, not in any children
<div class="child">one child</div>
<div class="child">another child</div>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
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>
I try to set a timeout on an element, fired with a jQuery plugin. This timeout is set again in the function depending on conditions. But, I want to clear this element's timeout before set another (if I relaunch the plug-in), or clear this manually.
<div id="aaa" style="top: 0; width: 100px; height: 100px; background-color: #ff0000;"></div>
Here's my code (now on http://jsfiddle.net/Ppvf9/)
$(function() {
$('#aaa').myPlugin(0);
});
(function($) {
$.fn.myPlugin = function(loops) {
loops = loops === undefined ? 0 : loops;
this.each(function() {
var el = $(this),
loop = loops,
i = 0;
if (loops === false) {
clearTimeout(el.timer);
return;
}
var animate = function() {
var hPos = 0;
hPos = (i * 10) + 'px';
el.css('margin-top', hPos);
if (i < 25) {
i++;
} else {
if (loops === 0) {
i = 0;
} else {
loop--;
if (loop === 0) {
return;
} else {
i = 0;
}
}
}
el.timer = window.setTimeout(function () {
animate();
}, 1000/25);
};
clearTimeout(el.timer);
//$('<img/>').load(function() {
// there's more here but it's not very important
animate();
//});
});
return this;
};
})(jQuery);
If I make $('#element').myPlugin();, it's launched. If I make it a second time, there's two timeout on it (see it by doing $('#aaa').myPlugin(0);
in console). And I want to be able to clear this with $('#element').myPlugin(false);.
What am I doing wrong?
EDIT :
SOLVED by setting two var to access this and $(this) here : http://jsfiddle.net/Ppvf9/2/
try saving the timeout handle as a property of the element. Or maintain a static lookup table that maps elements to their timeout handles.
Something like this:
el.timer = window.setTimeout(...);
I assume you need one timer per element. Not a single timer for all elements.