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Center Child to Parent When Child is Absolute Positioned [duplicate]

This question already has answers here:
How to center a "position: absolute" element
(31 answers)
How can I center an absolutely positioned element in a div?
(37 answers)
How to center absolute div horizontally using CSS?
(9 answers)
Closed 1 year ago.
Is there a way to position an absolute positioned element centered to its' parent who is relative positioned?
I was thinking if somehow I can calculate the width of the parent, and based on that, center the child? But not sure where to start whether with JavaScript or css.
Here's the codepen for reference

.tooltip {
/*
position the top-left corner of the element
in the center of the parent
*/
position: absolute;
top: 50%;
left: 50%;
/*
move the (positioned) element up and left
by half its own width/height
*/
transform: translate(-50%, -50%);
}
.container,
.tooltip{
border: 2px solid black;
padding: 10px;
}
.container {
position: relative;
width: 80vw;
height: 50vh;
}
<div class="container">
<div class="tooltip">Tooltip</div>
</div>
top and left percentages are percentages of that dimension on the of the parentElement.
Whereas the percentages in translate are relative to the element itself.

This should center your tooltip
const tooltip = document.getElementById('tooltip');
const parentWidth = tooltip.parentElement.offsetWidth;
tooltip.style.left = (parentWidth - tooltip.offsetWidth) / 2 + 'px';

You can use left/right positioning with transform:translateX in order to put element in the center of it's parent. I've made below snippet by using your codepen example:
#container {
border: 1px solid gray;
}
#wrapper {
display: inline-block;
position: relative;
height: fit-content;
border: 1px solid red;
padding: 8px;
}
#tooltip {
border:1px solid green;
position:absolute;
bottom: -24px;
left: 50%;
transform: translateX(-50%);
white-space: nowrap; /* to prevent break the text*/
}
<div id="wrapper">
Trigger Content, Trigger Content, Trigger Content,Trigger Content,
<div id="tooltip">I want to be a centered to my parent</div>
</div>

Edit: I think Thomas Answer contains the better way
Well it depends on your code if you want to do this css only, Here are several cases I came up with after doing my research:
1. If your div has a set size (width & height), According to this page you can take this steps:
Add left: 50% to the element that you want to center. You will notice
that this aligns the left edge of the child element with the 50% line
of the parent.
Add a negative left margin that is equal to half the width of the
element. This moves us back onto the halfway mark.
Next, we’ll do a similar process for the vertical axis. Add top: 50%
to the child
And then add a negative top margin equal to half its height.
In your case it looks like this:
#container {
border: 1px solid gray;
}
#wrapper {
display: inline-block;
position: relative;
height: fit-content;
border: 1px solid red;
padding: 8px;
}
#tooltip {
width: 100px; /* could be set by % aswell */
height: 10px;
border:1px solid green;
position:absolute;
left:50%;
top:50%;
margin-left: -50px;
margin-top: -5px;
bottom: -24px;
}
<div id="wrapper">
Trigger Content, Trigger Content, Trigger Content,Trigger Content,
<div id="tooltip">Center</div>
</div>
2. If it doesn't contain a set value but you want it to be centered anyway:
Not sure if it's a good way but you can use an absolute element inside wrapper before any other content, covering its parent and having its display value as flex and containing justify-content: center as well as align-items: center;
e.g. on your code:
#container {
border: 1px solid gray;
}
.full-flex{
width: 100%;
display: flex;
position: absolute;
justify-content: center;
align-items: center;
}
#wrapper {
display: inline-block;
position: relative;
height: fit-content;
border: 1px solid red;
/* padding: 8px; */ /* I removed the padding so you can get a better understanding of this */
}
#tooltip {
border:1px solid green;
}
<div id="wrapper">
<div class="full-flex">
<div id="tooltip">Wanna be centered</div>
</div>
Trigger Content, Trigger Content, Trigger Content,Trigger Content,
</div>

circle with gradient background border and changing colors with js

I need to make a circular border something like this code snippet / fiddle:
.box {
width: 250px;
height: 250px;
position: relative;
margin: auto;
margin: 30px;
border-radius: 50%;
background: #fff;
}
.box:after {
content: '';
position: absolute;
top: -15px;
bottom: -15px;
right: -15px;
left: -15px;
background-image: linear-gradient(to bottom left, #7B73A4 0%, #150E5E 100%);
z-index: -1;
border-radius: inherit;
}
<div class="box"></div>
except the inner space needs to be transparent and there needs to be a way of changing the border's gradient color.
I can use anything with js/jquery/css/html
Is it possible? If yes, how? Thanks

It is possible using a <canvas> element (which is supported in all browsers except for IE 8 and older).
Here are some useful links:
Canvas tutorial - MDN
Canvas API - MDN
Canvas Cheat Sheet
You could also use an SVG element, but that makes the animation much more difficult.

Vertically Draggable Division of Two Areas

I want to make a vertically draggable division of two areas like the following.
I just want to modify a online example of draggable divs to be what I want. Finally, I got this. Can someone give me some hints to modify it?
JSFiddle Link : https://jsfiddle.net/casperhongkong/omekvtka/14/
HTML
<div class="container">
<div class="area1">
Area 1
</div>
<div class="drag">
</div>
<div class="area2">
Area 2
</div>
</div>
CSS
.container {
position: fixed;
top: 51px;
right: 0px;
bottom: 0px;
left: 0px;
background-color: #272822;
border: 1px solid #222;
// margin: 0 auto;
//display: inline-block;
}
.area1 {
position: absolute;
height: 100%;
width: 30%;
background-color: #ddd;
display: inline-block;
}
.drag {
position: fixed;
width: 5px;
height: 100%;
background-color: #444;
display: inline-block;
}
.area2 {
position: absolute;
right: 0;
height: 100%;
width: 30%;
background-color: #ddd;
display: inline-block;
}
JavaScript
$(document).ready(function() {
$('.drag').on('mousedown', function(e) {
var $area1 = $('.area1'),
$area2 = $('.area2'),
startWidth_a1 = $area1.width(),
startWidth_a2 = $area2.width(),
pX = e.pageX;
$(document).on('mouseup', function(e) {
$(document).off('mouseup').off('mousemove');
});
$(document).on('mousemove', function(me) {
var mx = (me.pageX - pX);
$area1.css({
width: startWidth_a1 - mx;
});
$area2.css({
//left: mx / 2,
width: startWidth_a2 - mx,
//top: my
});
});
});
});

For javascript, I would recommend checking out a library, as this is slitghtly more complicated than just a few lines. #fauxserious gave Split.js as a fantastic example.
This is possible in pure HTML/CSS, though slightly limited, as discussed here.
HTML:
<div class="split-view">
<div class="resize-x panel" style="width: 216px;">
Panel A
</div>
<div class="panel">
Panel B
</div>
</div>
CSS:
/* Panels: */
.panel{
padding: 1em;
border-width: 6px;
border-style: solid;
height: 4em;
}
/* Resizing */
.resize-x {
resize: horizontal;
overflow: auto;
}
/* Split View */
.split-view {
margin: 1em 0;
width: 100%;
clear: both;
display: table;
}
.split-view .panel {
display: table-cell;
}

Based on #afischer's table-cell solution, here is an alternative one.
I have had to put accordions within the left side panel.
The sticky headers of the accordions require overflow to be visible,
while resize requires overflow to be anything but visible:
https://caniuse.com/#feat=css-sticky.
In the same time, I didn't need anything to place into the right side panel.
Thus, an overcome was employing resize on the right panel, and rotating by 180 deg to get the dragable side to the middle, as well as this way the dragable corner relocated to the top (visible without scrolling).
Plus some highlight has been added to the dragable corner.
/* Panels: */
.panel{
padding: 1em;
border-width: 6px;
border-style: solid;
height: 4em;
}
/* Resizing */
.resize-x {
resize: horizontal;
overflow: auto;
transform: rotate(180deg);
border-right: solid gray 1px;
}
/* Split View */
.split-view {
margin: 1em 0;
width: 100%;
clear: both;
display: table;
}
.split-view .panel {
display: table-cell;
}
.resize-x::-webkit-resizer {
border-width: 8px;
border-style: solid;
border-color: transparent orangered orangered transparent;
}
<div class="split-view">
<div
class="panel"
style="width: 216px;">
Panel A
</div>
<div class="panel resize-x">
Panel B
</div>
</div>
Unfortunately there are two disappointing thing with the above:
Firefox cannot handle the combination of table-cell and resize
Only a corner of the grabber is responsive, which can even be scrolled out easily
Here is an other solution which also takes the above two problems into account
without resize CSS property
and with full height responsive grabber
It's a combination of a flexbox and an input:range slider.
The trick is that the pointer-event CSS property can be different
on the slider's background
and on its grabber.
The slider covers the entire view. The background of the slider is transparent for the events too (pointer-events: none), while the dragbar itself catches the events (pointer-events: auto).
It requires minor Javascript and because I've implemented the production version in Nuxt.js, I use Vue.js here, instead of vanilla JS.
new Vue({
el: '#vue',
data: {
windowWidth: null,
splitWidth: null,
},
mounted() {
this.windowWidth = window.innerWidth;
// For arbitrary initial position:
this.splitWidth = this.windowWidth * 2/3;
},
computed: {
flexRatio() {
return this.splitWidth / this.windowWidth;
}
}
})
body {
margin:0;
}
main {
display: flex;
width: 100%;
height: 100vh;
}
article {
display: flex;
}
section {
width: 100%;
height: 100%;
text-align: justify;
padding: 20px;
}
.section-left {
background-color: darkseagreen;
}
.section-right {
background-color: orangered;
}
#split-grabber {
pointer-events: none;
position: fixed;
top: 0; right: 0; bottom: 0; left: 0;
-webkit-appearance: none;
/* Safari allows dragging behind scroll bar.
We fix it by shrinking its width on the right side via both
its range value :max="windowWidth - 12"
and its width (CSS) width: calc(100% - 12px)
...synchronously */
width: calc(100% - 12px);
height: 100vh;
background: transparent;
outline: none;
margin: 0;
}
#split-grabber::-webkit-slider-thumb {
z-index: 1;
pointer-events: auto;
-webkit-appearance: none;
appearance: none;
width: 5px;
height: 100vh;
background: lightgray;
box-shadow: 1px 2px 2px 0px gray;
cursor: col-resize;
}
#split-grabber::-moz-range-thumb {
z-index: 1;
pointer-events: auto;
-webkit-appearance: none;
appearance: none;
width: 5px;
height: 100vh;
background: lightgray;
box-shadow: 1px 2px 2px 0px gray;
cursor: col-resize;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<main id="vue">
<!-- Safari allows dragging behind scroll bar
We fix it by shrinking its width on the right side via both
its range value :max="windowWidth - 12"
and its width (CSS) width: calc(100% - 12px)
...synchronously -->
<input
id="split-grabber"
type="range"
v-model="splitWidth"
:max="windowWidth - 12"
>
<article
class="article"
:style="{'flex': flexRatio}"
>
<section
class="section section-left">
splitWidth:{{ splitWidth }}px<br>
“There was a rich man who always dressed in the finest clothes and lived in luxury every day.
And a very poor man named Lazarus, whose body was covered with sores, was laid at the rich man’s gate.
He wanted to eat only the small pieces of food that fell from the rich man’s table. And the dogs would come and lick his sores.
Later, Lazarus died, and the angels carried him to the arms of Abraham. The rich man died, too, and was buried.
In the place of the dead, he was in much pain. The rich man saw Abraham far away with Lazarus at his side.
He called, ‘Father Abraham, have mercy on me! Send Lazarus to dip his finger in water and cool my tongue, because I am suffering in this fire!’
</section>
</article>
<article
class="article"
:style="{'flex': 1-flexRatio}"
>
<section class="section section-right">
But Abraham said, ‘Child, remember when you were alive you had the good things in life, but bad things happened to Lazarus. Now he is comforted here, and you are suffering.
Besides, there is a big pit between you and us, so no one can cross over to you, and no one can leave there and come here.’
The rich man said, ‘Father, then please send Lazarus to my father’s house.
I have five brothers, and Lazarus could warn them so that they will not come to this place of pain.’
But Abraham said, ‘They have the law of Moses and the writings of the prophets; let them learn from them.’
The rich man said, ‘No, father Abraham! If someone goes to them from the dead, they would believe and change their hearts and lives.’
But Abraham said to him, ‘If they will not listen to Moses and the prophets, they will not listen to someone who comes back from the dead.’”
</section>
</article>
</main>

align texts or images in Bootstrap carousel

I use Bootstrap 3.3.4 and I want to know which way is better to align texts or items in carousel.
here is a exemple from a slider. How can I align text like this and stay at any screen resolution at the same place. I use top: x, right: x but every time when I resize the window, text climb above and not stay at middle anymore.
CSS for align
.carousel-caption {
position: absolute;
right: 15%;
bottom: 40%;
left: 15%;
z-index: 10;
padding-top: 20px;
padding-bottom: 20px;
color: #fff;
text-align: center;
text-shadow: 0 1px 2px rgba(0, 0, 0, .6);
}
Just basic bootstrap slider. But If I use bottom 40% for exemple to rise text at middle of the page works. But if I use smaller displays the text rise and stay almost on top.
In this exemple text stay fixed on every device.

<div class="wrap">
<div class="display-table">
<div class="display-cell">
<h1>Title in here</h1>
</div>
</div>
</div>
<style>
.wrap {
width: 100%;
height: 400px;
}
.display-table {
width: 100%;
height: 100%;
display: table;
}
.display-cell {
width: 100%;
height: 100%;
display: table-cell;
vertical-align: middle;
}
</style>
This allows fixed vertical alignment and should work cross browser. Just note the fixed height applied to .wrap must be present for the children to inherit 100% height!
Hope this helps :)

Hope, Try this demo that centers text vertically in the Bootstrap carousel.
Here is the Fiddle.
All I do here is give the div a height that contains the text and then position it with this css...
.vcenter {
position: absolute;
height:100px;
width:100%;
top:50%;
bottom:50%;
margin-top: -50px;
margin-bottom: -50px;
}

border-radius + overflow:hidden when animating with jQuery

Check this jsFiddle.
The orange bar is serving as a progress bar where the value under the circle is how high the progress bar should be.
Any idea why the overflow:hidden; is beeing disregarded and how do one solve this problem? Oblviously nothing should go outside the circle.
Also is there a better solution for this?

Modified your fiddle a little bit. Here is the link
Modifications:
Changed .outerContainer css to display:block from display:table and addedmargin-top:30px to p css
Check if this works for you.

position: absolute and overflow: hidden don't appear to be playing nicely with display: table/table-cell. Removing the table stuff you had in there to vertically center the text fixes the problem. In Firefox, at least.

I think it's the browser thing...
This is the CSS3 version...
.progressBar {
display: block;
width: 100%;
height: 0;
position: absolute;
bottom: 0;
left: 0;
background: #ec6730;
transition: height 1s;
}
.innerContainer:hover > .progressBar {
height: 300px;
}
http://jsfiddle.net/ZyhgT/2/
It no longer flashing 'cause browser handle the job (not js loop animation...). But still it shows the edge on animation finish!!! This could be the browser things... Could be a bug...

This is not related to jQuery or any javascript. In fact, if you delete all your javascript and manipulate the height of your .progressBar using css on li:hover, you will notice the bug anyway.
It appears to be a browser issue as reported on: https://code.google.com/p/chromium/issues/detail?id=157218
As a workaround try adding an imperceptible css transform to the mask element:
.outerContainer {
-webkit-transform: rotate(0.000001deg);
}

You just need to change your .outerContainer class and it works just fine!
.outerContainer {
position: relative;
display: block;
height: 96px;
width: 96px;
overflow: hidden;
background: #fff;
border: 2px solid #fff;
-webkit-border-radius: 50px;
border-radius: 50px;
}

Put the level class inside the outerContainer div and style the span inside the level class to be relatively positioned. In the JavaScript, to calculate the level, divide by 10 instead of 100 for the perfect circular hover effect.
Here is a fiddle.
HTML
<div class="outerContainer">
<div class="innerContainer">
<p>Circle 3</p>
<span class="progressBar"></span>
</div>
<div class="level"><span>75</span>
</div>
</div>
CSS
body {
background: blue;
}
#circles {
text-align: center;
margin: 100px 0;
}
li {
display: inline-block;
margin: 0 10px;
position: relative;
}
.outerContainer {
position: relative;
display: block;
height: 96px;
width: 96px;
overflow: hidden;
background: #fff;
border: 2px solid #fff;
-webkit-border-radius: 50px;
border-radius: 50px;
}
.innerContainer {
display: table-cell;
vertical-align: middle;
width: 100%;
margin: 0 auto;
text-align: center;
}
p {
color: #000;
width: 96px;
position: relative;
z-index: 2;
}
.progressBar {
display: block;
width: 100%;
height: 0;
position: absolute;
bottom: 0;
left: 0;
background: #ec6730;
}
.level span{
position:relative;
}
JS
$(function() {
$("#circles li").hover(function(){
var thisElement = $(this);
var level = $(this).find(".level").text();
var elementHeight = $(this).find(".outerContainer").height();
level = (level/10)*elementHeight;
$(thisElement).find(".progressBar").stop().animate({
height: level
}, 300);
}, function() {
var thisElement = $(this);
$(".progressBar").stop().animate({
height: 0
}, 300);
});
});

display: table doesn't work that good with CSS positioning;
you should avoid using that, and find some other way to vertically center your labels.
If your circles have a known height, like your code seems to indicate (height:96px ecc), then just use a fixed top position for an absolutely positioned <p> element:
http://jsfiddle.net/ZyhgT/5/
Note that you don't even need jQuery for this, it is all achievable with just CSS3 (unless you are targeting old browsers)