This question already has answers here:
Why can't an element with a z-index value cover its child?
(5 answers)
Closed 1 year ago.
**Here is a simple code **
div {
border: 1px solid blue;
}
.one {
background-color: red;
width: 300px;
height: 300px;
}
.two {
background-color: orange;
width: 300px;
height: 300px;
position: relative;
top: 100px;
left: 100px;
z-index: 10;
}
.twenty {
background-color: pink;
width: 300px;
height: 300px;
position: relative;
top: 100px;
left: 100px;
z-index: 500;
}
.three {
margin-top: -10px;
margin-left: 10px;
background-color: yellow;
width: 300px;
height: 300px;
}
.four {
background-color: green;
width: 300px;
height: 300px;
position: relative;
top: 80px;
left: 120px;
z-index: 11;
}
<div class="one">
<div class="two">
<div class="twenty">
Can pink be above green?
</div>
</div>
</div>
<div class="three">
<div class="four">
</div>
</div>
How to make the pink square to be above the green square? Is it possible with CSS changes only without HTML changes? Why z-index applied to the .twenty class doesn't work in this case?
Thank you.
This question is NOT a duplicate of Why can't an element with a z-index value cover its child? :
In this question we'd like the child to cover, not the parent!
All layers, except the twentieth, should not have Z order. We specify absolute an order and an order of a layer on Z.
.twenty{
position: absolute;
...
z-index: 1;
}
You should set .four with a lower z-index than .two which is the element that contains .twenty but this may not be the expected result (green also becomes under the orange).
It's not possible without changing the HTML structure, like putting .twenty inside .four, or redefining all the indexes. This is how the stacking context works.
Given this code:
<div class="A">
<div class="One"></div>
<div class="Two"></div>
</div>
<div class="B">
<div class="Three"></div>
</div>
From the top view
From the side view
Lear more about the stacking context:
CSS stacking contexts and z-index made easy
The stacking context
Yes, we can ;)... if orange gets a higher z-index than green...
.two {
...
z-index: 12;
}
It's because pink is a child of orange...
Related
Here the second div is positioned absolute. first div is taking 60% of outer div width, but the second div is taking 60% width of the whole screen. I know that by giving position: relative for the first div will solve the problem.Is there a way to solve it other than by giving position: relative?
.outer {
height: 100px;
width: 100px;
}
.first {
background: black;
width: 60%;
color: white;
}
.second {
position: absolute;
width: inherit;
background: yellow;
color: black;
}
<div class="outer">
<div class="first">
parent
<div class="second">
child
</div>
</div>
</div>
If the outer div will have a defined width you can rely on CSS variable to define the percentage and inherit will work like expected:
.outer {
height: 100px;
--w:100px;
width: var(--w);
}
.first {
background: black;
width: calc(0.6 * var(--w));
color: white;
}
.second {
position: absolute;
width: inherit;
background: yellow;
color: black;
}
<div class="outer">
<div class="first">
parent
<div class="second">
child
</div>
</div>
</div>
If you don't know in advance the width of your parent, you can compute its width in javascript with a document.getElementById('parentID').getBoundingRect().width and use that value to resize your child element to 60% of this value.
But why would you not want to use position: relative on the parent ?
So not sure if this one is possible but from my understanding of the spec the parent of a position fixed element should be the viewport not a parent element with position relative.
That obviously all works when it comes to positioning but not with z-index.
If you take a look at this example,
.parent {
height: 1000px;
}
.el-one {
position: relative;
z-index: 2;
height: 100px;
width: 100%;
color: red;
}
.el-two {
position: relative;
z-index: 2;
background-color: black;
height: 500px;
width: 100%;
}
.im-fixed {
position: fixed;
top: 0;
left: 0;
}
<div class="parent">
<div class="el-one">
<div class="im-fixed">Hello</div>
</div>
<div class="el-two"></div>
</div>
https://codepen.io/anon/pen/mmvXaE
The fixed element goes behind the black section if you scroll down, what I need is a way to get the red element to the front without moving it out of el-one.
I have a project where some embed code needs to become fixed when you scroll past it, this is a better example of the actual code. The example above just highlights the issue in a simple way:
<div class="parent">
<div class="el-one">
<div id="my-wrapper">
<iframe class="im-fixed"></iframe>
</div>
</div>
<div class="el-two"></div>
</div>
,
I found this online talking about what I believe has caused the issue: https://developers.google.com/web/updates/2012/09/Stacking-Changes-Coming-to-position-fixed-elements but no luck finding a workaround.
All I can think of is using JS to move the element from where an editor puts the embed code and prepending it to the body when the user scrolls past the element.
Anyone else come across this or have any ideas?
You want something like this? Increase the z-index of .el-one higher than the one you want to overlap
.parent {
height: 1000px;
}
.el-one {
position: relative;
z-index: 99;
height: 100px;
width: 100%;
color: red;
}
.el-two {
position: relative;
z-index: 2;
background-color: black;
height: 500px;
width: 100%;
}
.im-fixed {
position: fixed;
top: 0;
left: 0;
}
<div class="parent">
<div class="el-one">
<div class="im-fixed">Hello</div>
</div>
<div class="el-two"></div>
</div>
Use the following:
.el-two {
position: relative;
z-index: -1;
background-color: black;
height: 500px;
width: 100%;
}
There are several ways to solve this issue. Increasing Z-Index, cleaning up the div and etc.
I think you are sort of trying sticky header functionality. There is a new value for position CSS attribute.
position: sticky
I have cleaned up the code and removed all Z-Index. Please check the attached code snippet.
Note: Supported only in Chrome, Firefox
Not supported in IE.
.parent {
background-color: green;
position: relative;
width: 100%;
height: 5000px;
}
.header {
position: sticky;
top: 0px;
left: 0px;
height: 50px;
background-color: yellow;
}
.el-one {
background-color: blue;
color: white;
height: 100px;
width: 100%;
}
.el-two {
background-color: orange;
height: 500px;
width: 100%;
}
<div class="parent">
<div class="header">I am a header</div>
<div class="container">
<div class="el-one">
I am el-one
</div>
<div class="el-two">
I am el-two
</div>
</div>
</div>
I am attempting to get elements to transition onscreen. For example purposes I have set them to transition on page load.
The elements that are not floated work perfectly fine. However, the elements that have been floated right (They have the class exleft because they should be expanding leftward) do not transition.
Can someone explain why this is happening?
JsFiddle here
HTML:
<div id="templatebox">
<div class="ribbon exright" id="r1">
</div>
<div class="ribbon exleft" id="r2">
</div>
<div class="ribbon exright" id="r3">
</div>
<div class="ribbon exleft" id="r4">
</div>
</div>
CSS:
#templatebox{
width: 100%;
height: 800px;
padding-top: 50px;
}
.ribbon{
height: 50px;
position: relative;
transition: all 1s ease;
width: 300px;
margin-bottom: 20px;
z-index: 1000;
}
.exleft{
right: -1200px;
left: 0px;
margin-right: -100px;
float: right;
}
.exright{
left: -1200px;
right: 0px;
margin-left: -100px;
}
#r1{
background-color: red;
}
#r2{
background-color: green;
}
#r3{
background-color: blue;
top: 170px;
}
#r4{
background-color: yellow;
top: 170px;
}
JS:
var ribbons = document.getElementsByClassName("ribbon");
for(var i=0, j=ribbons.length; i<j; i++){
ribbons[i].style.right = "0px";
ribbons[i].style.left = "0px";
}
The floated ribbon has both a left and right attribute value set. If both attributes are set to a pixel value, only the left value will be used.
By setting
left: auto;
You can manipulate the right value and it will work as expected.
Here is an updated JSFiddle: https://jsfiddle.net/ym5p7y6v/
I would like to be able to add an animation to this simple query for when the div is transitioned to its new position.
<div class="container">
<div class="left-side-bar">
<div class="long blue" id="1">
1
</div>
<div class="short red" id="2">
2
</div>
</div>
<div class='middle-side-bar'>
<div class='long green' id="3">
3
</div>
</div>
<div class='right-side-bar'>
<div class='short yellow' id="4">
4
</div>
</div>
</div>
the CSS
.left-side-bar{
clear: both;
width: 32%;
text-align: center;
float: left;
margin-top: 1%;
margin-bottom: 100px;
}
.middle-side-bar{
width: 32%;
text-align: center;
float: left;
margin: 1% 0 1% 1.6%;
}
.right-side-bar{
width: 32%;
text-align: center;
float: left;
margin: 1% 0 1% 1.6%;
}
.green {
background-color: green;
}
.long {
height: 300px;
}
.short {
height: 200px;
}
.red {
background-color: red;
}
.blue {
background-color: blue;
}
.yellow {
background-color: yellow;
}
Basically I want the div to be moved to its new place as an animated transition, rather than have it simply appear.
here is the jsfiddle
DEMO
Unfortunately, the replaceWith method does not work with animate in jQuery. Instead, you will probably need to find an alternative method to your solution. Here's one that slowly transitions the red box on top of the yellow box... http://jsfiddle.net/aeyg89rd/4/
I added the following jQuery, note that I used offset() to get the left and top properties of the yellow box, then I moved the red box to those left and top positions using animate() :
$(document).ready(function () {
var num4 = $("#4").offset();
$("#2").animate({ top: num4.top, left: num4.left }, 1000);
});
And I changed some CSS attributes for .red class so that I can move it around with the jQuery code above. More specifically, I changed its position to absolute, and gave it a width dimension:
.red {
position: absolute;
top: 320px;
background-color: red;
width: 150px;
}
I have a base html element and I have an overlay element that contains some buttons.
I want the mouse to be able to interact both with the base element as well as with the buttons in the overlay.
The problem is that the overlay captures the mouse events of the base element.
Is there a way that I can disable the mouse interactions for the transparent background of the overlay (like IE seems to do), while keeping the mouse interactions for the buttons inside the overlay ? Or do I need to change the structure of my code ?
Fiddle
Here's one approach.
With an overlay element:
http://jsfiddle.net/XC95u/11/
Without an overlay element:
http://jsfiddle.net/XC95u/3/
I modified the html structure and use z-index to control the positions of the divs.
HTML:
<div class="main">
<div class="base"></div>
<div class="overlay">
</div>
<div class="button left"></div>
<div class="button right"></div>
</div>
CSS：
.main {
width: 350px;
height: 150px;
position: relative;
}
.base {
background-color: #c0c0c0;
width: 100%;
height: 100%;
}
.overlay {
position: absolute;
top: 0;
width: 100%;
height: 100%;
z-index: -1;
}
.button {
background-color: #707070;
width: 30px;
height: 30px;
position: absolute;
top: 60px;
z-index: 99;
}
.right {
right: 0;
}