Develop Reference

Circle radius set in CSS, how to get value through JS?

I am trying to style a circle showing the progress percent as the circumference. I want to get the radius in JS but style the circle in CSS.
The function I use to do this is setPercent. It reads the radius of the circle by selecting the radius element and getting the radius measures from there.
This is the code that works:
const fn = function() {
let circle = document.querySelector('circle.percent')
debugger
let radius = circle.r.baseVal.value
let circumference = 2 * Math.PI * radius
circle.style.strokeDasharray = `${circumference} ${circumference}`
this.setPercent = function(percent) {
circle.style.strokeDashoffset = (100 - percent) / 100 * circumference
}
}
setTimeout(fn, 1)
:root {
--back-ground: #30384a;
--neutral-circle-border: #656c79;
--completed-color: #67ed8b;
background: var(--back-ground)
}
div.normal_square {
width: 100px;
height: 100px;
}
svg.progress-ring {
margin: 0 auto;
display: block;
}
svg.progress-ring circle {
fill: transparent;
stroke-width: 2;
stroke: black;
cx: 50%;
cy: 50%;
r: 40%;
}
svg.progress-ring circle.percent {
transition: all 0.5s ease-out;
transform: rotate(-90deg);
transform-origin: 50% 50%;
}
svg.progress-ring circle.background {
stroke: var(--neutral-circle-border)
}
<div margin="0 auto">
<svg class="progress-ring" width="200px" height="200px" xmlns="http://www.w3.org/2000/svg">
<circle class="background"/>
<circle class="percent" fill="transparent" stroke-width="6" stroke="black" cx="50%" cy="50%" r="40%" />
</svg>
</div>
However, when I remove that r="40%" from my code, I can't get the radius measured from circle.r.... Why does it happen and how can I fix it?

Use window.getComputedStyle(element) to retrieve the value instead.
Currently you're retrieving the property value from the element reference, when you remove the property there's nothing left to retrieve.

Just ran into the same problem. This worked:
let radius = circle.getBoundingClientRect().width / 2;
Seems silly to have to do this though. Hopefully someone posts a better way.

Need to increase height and width of circle

I need to increase circle height and width to double. But it's not working. Please suggest me where I put the error in the code. I have no idea about the value of r. Please help me to update the value of r.
Here is my sample code.
var time = 10;
var initialOffset = '440';
var i = 1
var r = $(".circle_animation").attr("r");
var interval = setInterval(function() {
$('.circle_animation').css(
'stroke-dashoffset',
initialOffset - (i * (initialOffset / time) * (r / 69.85699))
);
$('h2').text(i);
if (i == time) {
clearInterval(interval);
}
i++;
}, 1000);
.item {
position: relative;
float: left;
}
.item h2 {
text-align: center;
position: absolute;
line-height: 125px;
width: 100%;
}
svg {
-webkit-transform: rotate(-90deg);
transform: rotate(-90deg);
}
.circle_animation {
stroke-dasharray: 440;
/* this value is the pixel circumference of the circle */
stroke-dashoffset: 440;
transition: all 1s linear;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="item html">
<h2>0</h2>
<svg width="160" height="160" xmlns="http://www.w3.org/2000/svg">
<g>
<title>Layer 1</title>
<circle id="circle" class="circle_animation" r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#6fdb6f" fill="none"/>
</g>
</svg>
</div>

As you guessed, you have to change the value of r to change the radius.
If we look at the javascript code:
var r = $(".circle_animation").attr("r");
It means that r is the value of the html attribute r of the element with class name circle_animation.
If we then look at the html markup:
<circle id="circle" class="circle_animation" r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#6fdb6f" fill="none"/>
we see that r is set to 69.85699 on the circle with class name circle_animation
After that you have to remember that since your drawing a larger circle, you will also have to double both the size of the svg and the stroke-dasharray and stroke-dashoffset (these values are supposed to be 2*2*PI*r for this animation).
Here is your example with doubled radius as you requested:
var time = 10;
var initialOffset = '440';
var i = 1
var r = $(".circle_animation").attr("r");
var interval = setInterval(function() {
$('.circle_animation').css(
'stroke-dashoffset',
initialOffset-(i*(initialOffset/time)*(r/139.71398))
);
$('h2').text(i);
if (i == time) {
clearInterval(interval);
}
i++;
}, 1000);
.item {
position: relative;
float: left;
}
.item h2 {
text-align:center;
position: absolute;
line-height: 125px;
width: 100%;
margin-top: 60px;
}
svg {
-webkit-transform: rotate(-90deg);
transform: rotate(-90deg);
}
.circle_animation {
stroke-dasharray: 878; /* this value is the pixel circumference of the circle */
stroke-dashoffset: 878;
transition: all 1s linear;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="item html">
<h2>0</h2>
<svg width="320" height="320" xmlns="http://www.w3.org/2000/svg">
<g>
<title>Layer 1</title>
<circle id="circle" class="circle_animation" r="139.71398" cy="162" cx="162" stroke-width="8" stroke="#6fdb6f" fill="none"/>

your radius is 69.85699 on the circle. lets consider 70 for simplicity.
double will be 140, circumference of this circle would be 880
now your cx and cy should also consider the offset/width of the stroke.
so, 140 + (8/2)
most other calculations are simple as you have already done them.
var time = 10;
var initialOffset = '880';
var i = 1
var r = $(".circle_animation").attr("r");
var interval = setInterval(function() {
$('.circle_animation').css(
'stroke-dashoffset',
initialOffset-(i*(initialOffset/time)*(r/140))
);
$('h2').text(i);
if (i == time) {
clearInterval(interval);
}
i++;
}, 1000);
.item {
position: relative;
float: left;
}
.item h2 {
text-align: center;
position: absolute;
line-height: 265px;
width: 100%;
}
svg {
-webkit-transform: rotate(-90deg);
transform: rotate(-90deg);
}
.circle_animation {
stroke-dasharray: 880; /* this value is the pixel circumference of the circle */
stroke-dashoffset: 880;
transition: all 1s linear;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="item html">
<h2>0</h2>
<svg width="300" height="300" xmlns="http://www.w3.org/2000/svg">
<g>
<title>Layer 1</title>
<circle id="circle" class="circle_animation" r="140" cy="144" cx="144" stroke-width="8" stroke="#6fdb6f" fill="none"/>
</g>
</svg>
</div>

You need this, Check this fiddle and code https://jsfiddle.net/rmcej7vk/
HTML
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="item html">
<h2>0</h2>
<svg width="320" height="320" xmlns="http://www.w3.org/2000/svg">
<g>
<title>Layer 1</title>
<circle id="circle" class="circle_animation" r="139.7139" cy="162" cx="162" stroke-width="8" stroke="#6fdb6f" fill="none"/>
</g>
</svg>
</div>
JS
var time = 10;
var initialOffset = '880';
var i = 1
var r = $(".circle_animation").attr("r");
var interval = setInterval(function() {
$('.circle_animation').css(
'stroke-dashoffset',
initialOffset - (i * (initialOffset / time) * (r / 139.7139))
);
$('h2').text(i);
if (i == time) {
clearInterval(interval);
}
i++;
}, 1000);
CSS
.item {
position: relative;
float: left;
}
.item h2 {
text-align: center;
position: absolute;
line-height: 250px;
width: 100%;
}
svg {
-webkit-transform: rotate(-90deg);
transform: rotate(-90deg);
}
.circle_animation {
stroke-dasharray: 880;
/* this value is the pixel circumference of the circle */
stroke-dashoffset: 880;
transition: all 1s linear;
}

svg path, that has property stroke-dashoffset and svg "fill" on page scroll in wordpress

I ve been trying to find how to achieve svg path, that has property stroke-dashoffset and svg "fill" on page scroll,its been done on this website: https://asaro.co.uk/

$(document).on('scroll', function(e){
var d = d || parseInt($('.c-line.c-line--fill-2').css('stroke-dashoffset'));
var lastScrollTop = 0;
st = $(this).scrollTop();
if(st < lastScrollTop) {
if( d <= 1800){
d += $(this).scrollTop() / 20;
}
}
else {
if( d >= 0){
d -= $(this).scrollTop() / 20;
}
}
lastScrollTop = st;
$('.c-line.c-line--fill-2').css('stroke-dashoffset', d );
});
body {
background: #000;
height:1000px;
}
.c-line-wrap {
position: absolute;
}
.c-line-wrap svg {
height: 100%;
width: 100%;
}
.c-line {
fill: none;
stroke-miterlimit: 10;
}
.c-line--fill-1 {
stroke: #404150;
}
.c-line--fill-2 {
stroke: #fff;
}
.c-line--dashed {
stroke: #131424;
stroke-dasharray: 5 5;
stroke-width: 4;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<div class="cont">
<svg viewBox="0 0 1327.78 2952.52" preserveAspectRatio="none">
<path class="c-line c-line--fill c-line--fill-1" d="M.11.49s415.15,96,291.15,576-132,896,340,1284,732,472,692,1092" vector-effect="non-scaling-stroke"></path>
<path class="c-line c-line--fill c-line--fill-2 js-line--fill" d="M.11.49s415.15,96,291.15,576-132,896,340,1284,732,472,692,1092" vector-effect="non-scaling-stroke" style="stroke-dashoffset: 1800; stroke-dasharray: 1879.02px, 1889.02px;"></path>
<path class="c-line c-line--dashed" d="M.11.49s415.15,96,291.15,576-132,896,340,1284,732,472,692,1092" vector-effect="non-scaling-stroke"></path>
</svg>
</div>
Something like this, but remember, this is AS IS and this is only to understand to question starter how it probably can work:
MAGIC FIDDLE

How would I display a dynamic de/scaling SVG transformation in Javascript to the page?

I have an SVG with two circles that are animated using #keyframes. I want to display the value of the circle's growth. Using javascript I want to display the value as they shrink and grow. getTotalLength() is probably not what I should be using but am not sure of the name of what I am looking for that does size/value check.
My codepen
an example of how it would look
// console.log("DOM Ready!");
// // setInterval, changes global var, translates the size of the val.
// // ever second or two
// // point 0.1 means 10px
// // displaying each circle's value as they grow and shrink
// var redValue = document.getElementById('red-grow').innerHTML = span;
// // var greenValue = document.getElementById('green-grow').innerHTML =
// var redCircle = document.getElementsByClassName('red');
// var greenCircle = document.getElementsByClassName('green');
// var current = 0;
// var width = 0;
// var destination = 700;
// var friction = 0.04;
// // scaling up both circles
// function scaleUp() {
// // console.log(scaleUp);
// current += (destination - current) * friction;
// redCircle[0].style.width = (current * 0.5 + 'px');
// greenCircle[0].style.width = (current * 0.5 + 'px');
// if (current >= destination - 0.1) {
// // clearInterval(redAnimate);
// }
// }
// var redAnimate = setInterval(scaleUp, 20);
// // scaling down both circles
// function scaleDown() {
// //console.log(redCircle[0].style, greenCircle[0].style);
// current += (destination - current) * friction;
// redCircle[0].style.width = (current * 0.5 + 'px');
// greenCircle[0].style.width = (current * 0.5 + 'px');
// if (current >= destination - 0.1) {
// // clearInterval(greenAnimate);
// }
// }
// var greenAnimate = setInterval(scaleDown, 20);
body {
background-color: #584E56;
}
h1 {
color: #fff;
text-align: center;
margin: 10px 0;
font-family: 'Roboto', sans-serif;
font-weight: bold;
font-size: 2.4rem;
text-transform: uppercase;
letter-spacing: .3rems;
}
svg {
position: absolute;
top: 0;
left: 0;
bottom: 0;
margin: auto;
}
.red, .green {
transform-origin: 60% 60%;
-webkit-animation: zoom 1s ease-in-out infinite alternate;
animation: zoom 1s ease-in-out infinite alternate;
}
#keyframes zoom {
from {
transform: scale(1, 1);
}
to {
transform: scale(0.7, 0.7);
}
}
.timeline {}
<h1>Animation SVG</h1>
<span class="" id="red-grow">
<!-- display here the red circle's value when growing and shrinking -->
Value:
</span>
<span class="" id="green-grow">
<!-- display here the green circle's value when growing and shrinking -->
Value:
</span>
<svg width="500" height="300" xmlns="http://www.w3.org/2000/svg">
<path fill="none" d="M-1-1h502v302H-1z"/>
<g>
<path class="timeline" stroke-linecap="null" stroke-linejoin="null" stroke-opacity="null" stroke-width="4.5" stroke="#000" fill="none" d="M39.5 31.5v239M463.5 269.5l-422-1"/>
<ellipse class="red" id="inner" stroke="#e5a3a3" ry="65.5" rx="67" cy="165" cx="158.5" stroke-width="4.5" fill="none"/>
<ellipse class="green" stroke="#98FB98" ry="65.5" rx="67" cy="165" cx="361.5" stroke-width="4.5" fill="none"/>
</g>
</svg>

The current value of the animated transform property can be extracted using the getComputedStyle() method. That returns a matrix in string form which then need to extract the scale value from.
Here's an example solution that displays the current scale as a percentage.
var redCircle = document.getElementsByClassName('red')[0];
var greenCircle = document.getElementsByClassName('green')[0];
var redLabel = document.getElementById('red-grow');
var greenLabel = document.getElementById('green-grow');
function updateLabels()
{
var transformValue = getComputedStyle(redCircle).getPropertyValue('transform');
// transformValue is a string of the form "matrix(1, 0, 0, 1, 0 ,0)".
// For this example the first number in the matrix corresponds to the scale.
// We'll use a regular expression to extract it.
var currentScale = transformValue.match(/matrix\(([\d.]+)\,/)[1];
redLabel.textContent = Math.round(currentScale * 100) + '%';
requestAnimationFrame(updateLabels);
}
requestAnimationFrame(updateLabels);
body {
background-color: #584E56;
}
h1 {
color: #fff;
text-align: center;
margin: 10px 0;
font-family: 'Roboto', sans-serif;
font-weight: bold;
font-size: 2.4rem;
text-transform: uppercase;
letter-spacing: .3rems;
}
svg {
position: absolute;
top: 0;
left: 0;
bottom: 0;
margin: auto;
}
.red, .green {
transform-origin: 60% 60%;
-webkit-animation: zoom 1s ease-in-out infinite alternate;
animation: zoom 1s ease-in-out infinite alternate;
}
#keyframes zoom {
from {
transform: scale(1, 1);
}
to {
transform: scale(0.7, 0.7);
}
}
.timeline {}
<h1>Animation SVG</h1>
<span class="" id="red-grow">
<!-- display here the red circle's value when growing and shrinking -->
Value:
</span>
<span class="" id="green-grow">
<!-- display here the green circle's value when growing and shrinking -->
</span>
<svg width="500" height="300" xmlns="http://www.w3.org/2000/svg">
<path fill="none" d="M-1-1h502v302H-1z"/>
<g>
<path class="timeline" stroke-linecap="null" stroke-linejoin="null" stroke-opacity="null" stroke-width="4.5" stroke="#000" fill="none" d="M39.5 31.5v239M463.5 269.5l-422-1"/>
<ellipse class="red" id="inner" stroke="#e5a3a3" ry="65.5" rx="67" cy="165" cx="158.5" stroke-width="4.5" fill="none"/>
<ellipse class="green" stroke="#98FB98" ry="65.5" rx="67" cy="165" cx="361.5" stroke-width="4.5" fill="none"/>
</g>
</svg>
However in my opinion, it might be more straightforward to avoid using CSS animation, and instead update the circle transform or radius yourself in the requestAnimationFrame() function.

Animate the Matrix.translate(x,y) in snap.svg

So I have this bit of code for two SVG arrows that squint when clicked on (via Snap.svg) and I want to have one of them move up and down along the y axis in a loop to make it look like it's hovering while the other one is active (clicked upon).
The Snap documentation has a bit about translating matrices but has nothing on animating them. I'm assuming this is possible with Snap (some way or other), so how is it done?
var suspend = true;
Array.prototype.slice.call(document.querySelectorAll('.arrow_button')).forEach(function(el) {
var s = Snap(el.querySelector('svg')),
path = s.select('path'),
squint = el.getAttribute('data-path-squint'),
resetPath = path.attr('d'),
callback = function() {
path.animate({
'path': resetPath
}, 1300, mina.elastic);
setTimeout(function() {
suspend = true;
}, 150)
};
el.addEventListener('click', function() {
if (suspend) {
path.animate({
'path': squint
}, 100, mina.linear, callback);
suspend = false;
};
});
});
.arrow_button {
width: 55px;
height: 79.8px;
position: fixed;
top: 50%;
margin-top: -40.5px;
cursor: pointer;
}
.arrow_styles {
fill: none;
stroke: #000;
stroke-width: 10;
stroke-linecap: round;
}
.left {
left: 7px;
}
.right {
right: 7px;
}
<script src="https://cdn.jsdelivr.net/snap.svg/0.4.1/snap.svg-min.js"></script>
<div class="left arrow_button" onclick="" preserveAspectRatio="none" data-path-squint="M46.2,16.1L14,35.5C8.4,40,8.6,47,14,51.1l32.2,19.6">
<svg id="left_arrow" class="arrow_styles" xmlns="http://www.w3.org/2000/svg" version="1.1" viewBox="0 0 60 86.8">
<path d="M43.7,8.1L20.2,33.2c-5.1,5.5-5.1,14.6,0,20.1l23.5,25.3" />
</svg>
</div>
<div class="right arrow_button" onclick="" preserveAspectRatio="none" data-path-squint="M9.9,16.1l32.2,19.4c5.6,4.5,5.5,11.5,0,15.5L9.9,70.6">
<svg id="right_arrow" class="arrow_styles" xmlns="http://www.w3.org/2000/svg" version="1.1" viewBox="0 0 60 86.8">
<path d="M16.3,8.1l23.5,25.1c5.1,5.5,5.1,14.6,0,20.1L16.3,78.6" />
</svg>
</div>