Why isn't this 'charAt' function working? - javascript

I am trying to create a typing effect using Vanilla JS, but for some reason the charAt function isn't working, and when I replace i with something like 0, it works, but it spits it all out at once even though it's wrapped in a setTimeout() function
var sentence = document.getElementsByClassName('sentence')[0];
var words = ['websites', 'apps', 'games'];
var speed = 100;
function type(word) {
for(var i = 0; i < word.length; i++) {
setTimeout(function() {
sentence.innerHTML += word.charAt(i);
}, speed);
}
}
type(words[0]);
* {
font-family: Arial;
}
.container {
display: flex;
align-items: center;
justify-content: center;
}
.cursor {
background: #000;
width: 2px;
height: 15px;
animation: blink 1s steps(5, start) infinite;
}
#keyframes blink {
to { visibility: hidden; }
}
<div class="container">
<div class="sentence">We make </div>
<div class="cursor"></div>
</div>

Use an "asynchronous" loop using recursion, because now you start all your timers at once:
var sentence = document.getElementsByClassName('sentence')[0];
var words = ['websites', 'apps', 'games'];
var speed = 100;
function type(word) {
if (!word.length) return; // Nothing to do
setTimeout(function() {
sentence.textContent += word.charAt(0);
type(word.substr(1)); // call recursively only now
}, speed);
}
type(words[0]);
* {
font-family: Arial;
}
.container {
display: flex;
align-items: center;
justify-content: center;
}
.cursor {
background: #000;
width: 2px;
height: 15px;
animation: blink 1s steps(5, start) infinite;
}
#keyframes blink {
to { visibility: hidden; }
}
<div class="container">
<div class="sentence">We make </div>
<div class="cursor"></div>
</div>

I'm pretty sure switching in this code block for your timeout will solve your issue. I haven't had the ability to test it myself though.
setTimeout(function(i) {
sentence.innerHTML += word.charAt(i);
}.bind(this,i), speed * i);

You probably want to use recursion so that each time a new letter is added to the innerHtml, it starts a new timeout. Right now it's creating all your timeouts at the same time so they all fire basically at the same time.

You should increase the speed as 100 is very low and you can't see it. "websites" is still loading in 800ms so it is hard to see anything.
Don't use "type" as your function name as this is a reserved jquery function.
This is how it works:
var sentence = document.getElementsByClassName('sentence')[0];
var words = ['websites', 'apps', 'games'];
var speed = 100;
function typewriter_string(word) {
sentence.textContent='';
for(var i = 0; i < word.length; i++) {
doSetTimeout(i, word);
}
}
function doSetTimeout(i, word){
setTimeout(function() {
sentence.textContent += word.charAt(i);
}, speed*i);
}
typewriter_string('websites');
In your code the "i" is always 8 because of the setTimeout in the for-loop.

Related

How to add a smooth animation to the progress bar

When I click I want to smoothly add segments to the progress bar. They are added but instantly. What could be the problem?
I tried to implement a smooth animation with setInterval, but nothing comes out. Percentages are also added instantly.
let progressBar = document.querySelector(".progressbar");
let progressBarValue = document.querySelector(".progressbar__value");
const body = document.querySelector("body");
let progressBarStartValue = 0;
let progressBarEndValue = 100;
let speed = 50;
body.addEventListener("click", function(e) {
if (progressBarStartValue === progressBarEndValue) {
alert("you have completed all the tasks");
} else {
let progress = setInterval(() => {
if (progressBarStartValue != 100) {
progressBarStartValue += 10;
clearInterval(progress);
}
progressBarValue.textContent = `${progressBarStartValue}%`;
progressBar.style.background = `conic-gradient(
#FFF ${progressBarStartValue * 3.6}deg,
#262623 ${progressBarStartValue * 3.6}deg
)`;
}, speed);
}
});
.progressbar {
position: relative;
height: 150px;
width: 150px;
background-color: #262623;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
}
.progressbar::before {
content: "";
position: absolute;
height: 80%;
width: 80%;
background-color: #0f0f0f;
border-radius: 50%;
}
.progressbar__value {
color: #fff;
z-index: 9;
font-size: 25px;
font-weight: 600;
}
<main class="main">
<section class="statistic">
<div class="container">
<div class="statistic__inner">
<div class="statistic__text">
<h2 class="statistic__title">You're almost there!</h2>
<p class="statistic__subtitle">keep up the good work</p>
</div>
<div class="progressbar"><span class="progressbar__value">0%</span></div>
</div>
</div>
</section>
</main>
This may not be exactly what you're looking for, but with the conic-gradient() implementation you're using, I'd recommend checking out a library call anime.js.
Here's an example with your implementation (same html and css):
// your.js
let progressBar = document.querySelector(".progressbar");
let progressBarValue = document.querySelector(".progressbar__value");
const body = document.querySelector("body");
// Switched to object for target in anime()
let progressBarObject = {
progressBarStartValue: 0,
progressBarEndValue: 100,
progressBarAnimationValue: 0 * 3.6 // New value needed for smoothing the progress bar, since the progress value needs to be multiplied by 3.6
}
// Not necessary, but I recommend changing the event listener to pointerup for better support
// Also not necessary, I changed function to arrow function for my own preference
body.addEventListener("pointerup", e => {
e.preventDefault()
if (progressBarObject.progressBarStartValue === progressBarObject.progressBarEndValue) {
alert("you have completed all the tasks");
} else {
let newValue = 0 // Needed so we can set the value, before it's applied in anime()
if (progressBarObject.progressBarStartValue != 100) {
// Math.ceil() allows us to round to the nearest 10 to guarantee the correct output
newValue = Math.ceil((progressBarObject.progressBarStartValue + 10) / 10) * 10;
}
// Optional: Prevents accidentally going over 100 somehow
if (newValue > 100) {
newValue = 100
}
anime({
targets: progressBarObject,
progressBarStartValue: newValue,
progressBarAnimationValue: newValue * 3.6,
easing: 'easeInOutExpo',
round: 1, // Rounds to nearest 1 so you don't have 0.3339...% displayed in progressBarValue
update: () => {
progressBar.style.backgroundImage = `conic-gradient(
#FFF ${progressBarObject.progressBarAnimationValue}deg,
#262623 ${progressBarObject.progressBarAnimationValue}deg)`;
progressBarValue.textContent = `${progressBarObject.progressBarStartValue}%`;
},
duration: 500
});
}
});
Here's a CodePen using the anime.js CDN: Circular Progress Bar Smoothing
If you don't want to use a javascript library, then I'd recommend switching from the conic-gradient() to something else. I hear using an .svg circle with stroke and stroke-dasharray can work great with CSS transition.
You shouldn't setInterval your progress variable like this. instead, put it as a global variable outside the function then use it to gradually add 1 as long as the start value is less than progress, and you still can control the speed with your speed variable.
let progressBar = document.querySelector(".progressbar");
let progressBarValue = document.querySelector(".progressbar__value");
const body = document.querySelector("body");
let progressBarStartValue = 0;
let progressBarEndValue = 100;
let speed = 50;
let progress = 0;
body.addEventListener("click", function(e) {
if (progressBarStartValue === progressBarEndValue) {
alert("you have completed all the tasks");
} else {
progress += 10;
setInterval(() => {
if (progressBarStartValue < progress) {
progressBarStartValue += 1;
clearInterval();
}
progressBarValue.textContent = `${progressBarStartValue}%`;
progressBar.style.background = `conic-gradient(
#FFF ${progressBarStartValue * 3.6}deg,
#262623 ${progressBarStartValue * 3.6}deg
)`;
}, speed);
}
});
.progressbar {
position: relative;
height: 150px;
width: 150px;
background-color: #262623;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
border: 3px solid red;
}
.progressbar::before {
content: "";
position: absolute;
height: 80%;
width: 80%;
background-color: #0f0f0f;
border-radius: 50%;
border: 3px solid blue;
}
.progressbar__value {
color: #fff;
z-index: 9;
font-size: 25px;
font-weight: 600;
}
<main class="main">
<section class="statistic">
<div class="container">
<div class="statistic__inner">
<div class="statistic__text">
<h2 class="statistic__title">You're almost there!</h2>
<p class="statistic__subtitle">keep up the good work</p>
</div>
<div class="progressbar"><span class="progressbar__value">0%</span></div>
</div>
</div>
</section>
</main>

How to write a simple marquee effect with javascript

I need everyone's help. I currently need to implement a marquee effect. The yellow box needs to be scrolled up to show the name. Every time I scroll, I have to stay in the middle of the box for 1 second before continuing to scroll. I can find such an example on the Internet. , but the logic of this program is a bit difficult for me to understand for urban beginners. I wonder if anyone would like to provide a simpler and easier-to-understand writing method if I want to achieve this marquee effect?
​​Sorry, I am a beginner in the program, the current logic More complex programs are more difficult to understand.
function slideLine(box, stf, delay, speed, h) {
var slideBox = document.getElementById(box);
var delay = delay || 1000,
speed = speed || 20,
h = h || 40;
var tid = null,
pause = false;
var s = function() {
tid = setInterval(slide, speed);
};
var slide = function() {
if (pause) return;
slideBox.scrollTop += 1;
if (slideBox.scrollTop % h == 0) {
clearInterval(tid);
slideBox.appendChild(slideBox.getElementsByTagName(stf)[0]);
slideBox.scrollTop = 0;
setTimeout(s, delay);
}
};
setTimeout(s, delay);
}
slideLine("kanban_info", "p", 1000, 25, 40);
.kanban {
position: absolute;
margin: 0 auto;
width: 278px;
height: 50px;
background-color: yellow;
left: 50%;
transform: translate(-50%);
text-align: center;
line-height: 6;
}
.kanban .kenban_wrap {
height: 38px;
transform: translateY(28px);
overflow: hidden;
}
.kanban .kenban_wrap .kanban_info {
line-height: 38px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="kanban">
<div class="kenban_wrap" id='kanban_info'>
<p class="kanban_info">Allen</p>
<p class="kanban_info">james</p>
<p class="kanban_info">jack</p>
</div>
</div>
By combining scroll-behavior with anchor tags that are programmatically clicked you can simplify it. This should be easier to understand and you can go from there, even if it might not be the best solution.
let links = document.querySelectorAll("a"); // List of links
let div = document.querySelector("div");
let index = 0;
let t = 2000; // setTimeout duration
// Change Scroll behavior to prevent the animation from the last to first list item
function scrollBeh() {
if(index == 1) {
div.style.scrollBehavior = "auto";
t = 0; // Timeout duration to 0 to prevent `1` being shown longer than other list items
} else {
div.style.scrollBehavior = "smooth";
t = 2000;
}
}
// Loop through list items
function resetInd() {
if(index < 3) {
index++;
} else {
index = 0;
}
}
function clickLinks() {
links[index].click();
resetInd();
scrollBeh();
setTimeout(clickLinks, t);
}
setTimeout(clickLinks, t);
div {
width: 200px;
height: 100px;
background-color: darkblue;
overflow: hidden;
scroll-behavior: smooth;
}
li {
height: 100px;
list-style: none;
}
a {
text-decoration: none;
color: #FFF;
font-size: 50px;
}
<div>
<ul>
<li id="one">1</li>
<li id="two">2</li>
<li id="three">3</li>
<li id="one_loop">1</li>
</ul>
</div>

How do I fix my code such that the linear interpolation doesn't cross over?

I'm trying to make an infinite marquee (scrolling horizontal text), but on scroll it speeds up the translation of the HTML elements. I am achieving this effect by using a linear interpolation function.
You can see the effect on this site that I'm trying to remake: https://altsdigital.com/ It says "Not your usual SEO agency"
Mine almost works - the problem is that when my HTML resets its position - my text overlaps and briefly translates to the left before correcting. Keep your eyes on the left side of the page. You will see that the text overlaps at one brief moment then translates left (during it's movement to the right), it eventually corrects itself as it plays retaining the original gap. You can see in this screenshot the "t" and "I" are overlapping. Shortly after this, the text on the left translates left and there is a gap between the letters. I want it to have a gap and not briefly translate left.
I have no idea how to fix this - I've tried calling the lerp function on scroll but nothing seems to change. Thanks in advance.
Here's the code:
const lerp = (current, target, factor) => {
let holder = current * (1 - factor) + target * factor;
holder = parseFloat(holder).toFixed(3);
return holder;
};
class LoopingText {
constructor(DOMElements) {
this.DOMElements = DOMElements;
this.lerpingData = {
counterOne: { current: 0, target: 0 },
counterTwo: { current: 100, target: 100 },
};
this.interpolationFactor = 0.1;
this.direction = true;
this.speed = 0.2;
this.render();
this.onScroll();
}
onScroll() {
window.addEventListener("scroll", () => {
this.lerpingData["counterOne"].target += this.speed * 5;
this.lerpingData["counterTwo"].target += this.speed * 5;
});
}
lerp() {
for (const counter in this.lerpingData) {
this.lerpingData[counter].current = lerp(
this.lerpingData[counter].current,
this.lerpingData[counter].target,
this.interpolationFactor
);
}
this.lerpingData["counterOne"].target += this.speed;
this.lerpingData["counterTwo"].target += this.speed;
if (this.lerpingData["counterOne"].target < 100) {
this.DOMElements[0].style.transform = `translate(${this.lerpingData["counterOne"].current}%, 0%)`;
} else {
this.lerpingData["counterOne"].current = -100;
this.lerpingData["counterOne"].target = -100;
}
if (this.lerpingData["counterTwo"].target < 100) {
this.DOMElements[1].style.transform = `translate(${this.lerpingData["counterTwo"].current}%, 0%)`;
} else {
this.lerpingData["counterTwo"].current = -100;
this.lerpingData["counterTwo"].target = -100;
}
}
render() {
this.lerp();
window.requestAnimationFrame(() => this.render());
}
}
let textArray = document.getElementsByClassName("item");
new LoopingText(textArray);
#import url("https://fonts.googleapis.com/css2?family=Poppins:ital,wght#0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap");
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
font-family: "Poppins";
}
.hero-section {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
overflow: hidden;
position: relative;
width: 100%;
}
.loop-container {
position: relative;
width: 100%;
display: flex;
/* padding-right: 24px; */
}
.item {
position: absolute;
font-size: 15rem;
white-space: nowrap;
margin: 0;
}
span {
transition: all 0.2s;
cursor: default;
}
.hover:hover {
color: gray;
transition: all 0.2s;
}
<body>
<section class="hero-section">
<div class="loop-container">
<div class="item">Infinite Horizontal Looping Text</div>
<div class="item">Infinite Horizontal Looping Text</div>
</div>
</section>
<section class="hero-section">
</section>
</body>

requestAnimationFrame is not triggering the function supplied to it

I implemented a infinite loop animation using setInterval. I now like to change the implementation to requestAnimationFrame() so that I will have performance which I am after. For some reasons, requestAnimationFrame() does not call the function supplied to it.
My code looks like this;
var index = 0;
var $btn = $('.btn');
function btnBlinkRun() {
if (index < 2) {
index = index + 1;
} else {
index = 0;
}
$('#ani--scaleinout').removeAttr('id');
$($btn[index]).attr('id', 'ani--scaleinout');
window.requestAnimationFrame(btnBlinkRun);
}
btnBlinkRun();
.btn{
width: 30px;
height: 30px;
background: blue;
border-radius: 100%;
margin-bottom: 10px;
}
#ani--scaleinout {
animation: zoominout 1s ease-in;
}
#keyframes zoominout {
50% {
transform: scale(1.4);
}
100% {
transform: scale(1);
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>
<div class="btn" id="ani--scaleinout"></div>
<div class="btn"></div>
<div class="btn"></div>
</div>
It looks like what's going on is you are firing requestAnimationFrame multiple times per second. Your css animation has a duration of 1s. But you are removing the attribute every x ms.
It is triggering, it's just happening so fast you can't see it. To demonstrate change your call to window.requestAnimationFrame to use a setTimeout and you'll notice the animation:
setTimeout(function() {
window.requestAnimationFrame(btnBlinkRun);
}, 1000);
Not saying this is a preferred solution, but explaining why this is happening.
It executes alright. But it does not do what you want it to, i presume.
Animation frame fires on every single rending frame (e.g. 60fps) and not on CSS animation keyframes.
The animationend event is your friend here.
var index = 0;
var buttons = document.querySelectorAll('.btn');
function btnBlinkRun() {
if (index < 2) {
index = index + 1;
} else {
index = 0;
}
const element = document.querySelector('#ani--scaleinout');
element.id = null;
buttons[index].id = 'ani--scaleinout';
buttons[index].addEventListener("animationend", btnBlinkRun, { once: true });
}
btnBlinkRun();
.btn{
width: 30px;
height: 30px;
background: blue;
border-radius: 100%;
margin-bottom: 10px;
}
#ani--scaleinout {
animation: zoominout 1s ease-in;
}
#keyframes zoominout {
50% {
transform: scale(1.4);
}
100% {
transform: scale(1);
}
}
<div>
<div class="btn" id="ani--scaleinout"></div>
<div class="btn"></div>
<div class="btn"></div>
</div>

Animation within animation

I have animation that works like this:
var words_array = [];
words_array[0] = ['FUN', 'CREATIVE', 'INNOVATIVE'];
words_array[1] = ['WEB', 'WORLD'];
var words = ['We are <span class="words" style="background:#F33B65; font-weight:bold; padding: 0 10px;">FUN</span>',
'We like the <span class="words" style="background:#8be32d; font-weight:bold; padding: 0 10px;">WEB</span>'
];
$('#caption').html(words[0]);
var i = 0;
setInterval(function() {
$('#caption').animate({
width: 'toggle'
}, {
duration: 400,
done: function() {
$('#caption').html(words[i = (i + 1) % words.length]);
}
}).delay(300).animate({
width: 'toggle'
}, 400);
}, 5000);
body {
background: #333;
}
#caption {
height: 200px;
font-size: 80px;
line-height: 100px;
color: #fff;
overflow: hidden;
vertical-align: top;
white-space: nowrap;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<div id="caption"></div>
Every 5 seconds you get the toggle change of the words array. What I'd like to create, but I'm failing, is to have the toggle, then change few words in the .words span that are located in the words_array, and then after I've changed all the words, the toggle will happen, to the second sentence in the words array, and now I'll change the .words with the associated words_array and so on (if I have more sentences/words).
So the animation goes like this:
First 'slide': We are FUN
CREATIVE <- only this changes
INNOVATIVE
Slide toggle to second 'slide': We like the WEB
WORLD
And I could add as much words/slides as I want.
Doing one (just changing the words) or the other (sliding the sentence) is rather easy, but combining them is where I am stuck :\
EDIT:
I using the solution provided I tweaked the code a bit:
var words_array = [];
words_array[0] = ['FUN', 'CREATIVE', 'INNOVATIVE'];
words_array[1] = ['WEB', 'WORLD'];
var words = ['We are <span class="words" style="background:#F33B65; font-weight:bold; padding: 0 10px;">FUN</span>',
'We like the <span class="words" style="background:#8be32d; font-weight:bold; padding: 0 10px;">WEB</span>'
];
var $caption = $('#caption'),
i = 1,
w = 0,
$replace = $caption.find('.words');
function switchSentence() {
$caption.animate({
width: 'toggle'
}, {
duration: 400,
done: function() {
i = (i + 1) % words.length;
w = 0;
$caption.html(words[i]);
$replace = $caption.find('.words');
}
}).delay(300).animate({
width: 'toggle'
}, 400).delay(300);
}
switchSentence();
function switchWord() {
if (w >= words_array[i].length - 1) {
switchSentence();
w = 0;
} else {
w += 1;
}
if (words_array[i]) {
$replace.animate({
width: 'toggle'
}, {
duration: 400,
done: function() {
$replace.text(words_array[i][w]);
}
}).delay(300).animate({
width: 'toggle'
}, 400);
}
}
switchWord();
setInterval(switchWord, 2500);
body {
background: #333;
}
#caption {
height: 200px;
font-size: 80px;
line-height: 100px;
color: #fff;
overflow: hidden;
white-space: nowrap;
display: inline-block;
vertical-align: top;
}
.words {
display: inline-block;
vertical-align: top;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="caption"></div>
Added another animation in the words toggle. Thanks somethinghere for all the help!!
How about adding another timeout that will simply loop through the current available words? When you switch the arrays, simple reset the loop and let it check the correct amount of words. Notice in the snippet how the function switchSentence and switchWords are entirely unrelated. The switchWords function makes use of the currently selected sentence, and the swicthSentence function does the changing of the sentence, as the name suggests. This way you don't really have to know how to align them properly, they will do their job regardless. Have a look at the snippet:
var words_array = [
['FUN', 'CREATIVE', 'INNOVATIVE'],
['WEB', 'WORLD']
];
var words = [
'We are <span class="words fun">FUN</span>',
'We like the <span class="words like">WEB</span>'
];
var caption = $('#caption'),
i = 1,
w = 0,
replace = caption.find('span');
function switchSentence() {
caption.animate({width: 'toggle'},{
duration: 400,
done: function() {
i = (i + 1) % words.length;
w = 0;
caption.html(words[i]);
replace = caption.find('span');
}
}).delay(300).animate({width: 'toggle'}, 400);
}
switchSentence();
setInterval(switchSentence, 5000);
function switchWord(){
if(w >= words_array[i].length - 1) w = 0;
else w += 1;
if(words_array[i]) replace.text(words_array[i][w])
}
switchWord();
setInterval(switchWord, 500);
body {
background: #333;
}
#caption {
height: 200px;
font-size: 80px;
line-height: 100px;
color: #fff;
overflow: hidden;
vertical-align: top;
white-space: nowrap;
}
.fun, .like { font-weight: bold; }
.fun { background: #F33B65; }
.like { background: #8be32d; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<div id="caption"></div>
I also decided to clean up your code a bit to make it more legible and useable. I moved the two switching functions into separate functions and passed them to the interval listeners separately. This is so I could immediately kickstart them by calling them once myself. I also streamlined your array, and moved the style declaration into your CSS instead of inline styles (which makes both your JS and CSS look a lot cleaner).

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