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admin 10.02.2014

If you were paying attention in math class, the name z-index probably rings a bell: the z in z-index describes the z-axis on a three-dimensional Cartesian coordinate graph (x, y, z).
The CSS z-index property allows you to precisely layer content on your page no matter in what order you declared the objects in the page's HTML code. One reason why the z-index can be confusing is that the position property must be declared for each item you want to reposition with z-index.
The z-index is specified when you need to circumvent the default stacking of HTML elements. If we hadn't added the extra CSS code via the style attribute, the image would have been on top of the stack (above the menu). I like using realistic examples, so let's work with a popout menu setup – one of the most common examples where you'll run into z-index troubles. Because our popout code is defined before the content code, the popout menu is displaying behind the main content.
Especially if you're just starting, layering will be more of an experimental art than a precise science. Many CSS beginners may start using relative and absolute positioning when constructing their web page layout, because they think that is very easy to position certain element to their desired location just by changing the top and left value in the CSS. First take a look at the demo on how each layer stack above each other, we are using Relative, Absolute Positioning and Z-index here and not creating many div within it to stack the layers.
Below we will talk about how each properties behave and provides an example on how we stack each layer. When you position something relatively, you are modifying its position from where it would have been if you haven’t changed anything.
How z-index works is an element with a higher number overlaps an element with a lower number. Try looking at the image example below, and see how the z-index stack the layer above each other.
Alright, let's go through how we can construct each layer and how you can switch the stacking of each layer and how relative or absolute positioning affect. Basically, the content remains the same, just that the CSS properties is different and this layer 2 is declared within the Layer 1 div.
By applying position absolute, it bring this layer above the HTML element and because Layer 1 is set to relative, Layer 2 will sit within Layer 1. You can try changing the z-index value for Layer 2 and Layer 3 and see how each of them stack above or change the positioning between relative and absolute and see how each layer react. Lastly, for z-index the value can be any value as long as the layer you want to be at the bottom is smaller than the top. Most of the time, the layers are used in more dynamic way, like for instances, to make drop down menus visible when triggered.

What you can do to solve the problem when drop down menu appear behind the JavaScript component, is to try changing or adding the z-index in the CSS to that layer, most of the time it will solve the problem. Alright, I hope I have share a clear explanation on Z-Index, Relative and Absolute Positioning, as well as some good practices and pointers to take note. Opinions expressed in this article are those of the author and not necessarily those of Onextrapixel. Join the community and stay updated with useful design and development resources and materials for FREE.
The A-Z index on this campus map also applies to the central and west Sheffield map, which covers a larger area, so you may need to use both maps to find your location.
Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. To deal with seeing this in between state I am considering making an intermediate layout that only changes the zIndex of the cells in layout 2 before it transitions to layout 1. Would still love to know why the zIndex hack is necessary to correctly switch the other layouts. Given that the reusable cell recycle - could you not simply assign the new content to the cells in the correct position*? Not the answer you're looking for?Browse other questions tagged ios objective-c uicollectionviewlayout or ask your own question. In a formal paper, should I censor "brainf**k", the name of a programming language? Are Catholic priests allowed by church law to provide professional counseling and referrals to penitents who come to them to confess? How should I handle a highway patrolman who stops me occasionally to give incorrect instructions about my riding duties?
By default, HTML elements are indexed in order of appearance in the source code of the page (aka DOM tree). Developers usually write menu HTML first, placing that code at the top of the page; thus, the menu is at the top of the DOM tree but at the bottom of the visual stack.
Using the z-index CSS property, however, we can assign the menu a higher z-index relative to the image, forcing the menu to display at the top of the stack. We have a demo with a popout menu on the left that's supposed to be overlaid on top of the content on the right. Instead of ripping your hair out refreshing your browser a bazillion times, use Firebug for Firefox or the Developer Tools in Chrome to play around with the z-index and determine what code changes are needed in your pages.
While every web developers has been adopting the ease and stability of such language, it's not a simple breeze initially. Reason being that position absolute will actually takes stuff out of the document flow, creating many layers above each other and those layers don't see each other, so nothing will react to each other.

For me, I only use absolute positioning when I need to position something that needs to be in a certain position relative to its parent. It sits on the same layer as the parent's image or content element, therefore when you specifying top and left value in the CSS.
So when you want to switch Layer 3 around with Layer 2, just change the z-index value smaller than Layer 2. He enjoys creating functional websites and is particularly engrossed in all the tiny details mixed together to construct great user experiences. We strive to share the best web resources with the community but we are not affiliated to any other agency or company.
Does anyone have any suggestions for how to implement this in a way that doesn't require this hack? That is, you make sure the top cell that has item 0 in one layout has the last item in the second layout.
It's about controlling how various elements in your page (text, photos, menus, etc) are stacked on top of each other.
So, if you don't change anything, HTML elements defined later in a page's code will appear in front of HTML elements defined earlier when their x,y coordinates overlap. When we're talking about CSS Layers, Z-Index, Absolute and Relative Positioning, CSS beginner often fall into a lot of confusion when they tries to understand them. For instance, an image that I cannot have it as a background image which needs to sit right on at the corner of a box that will not expand, or take example our OXP RSS Feed that I want it to sit above between 2 div tags. I will advise you to download the demo and play around with it, because learning CSS need some hands-on practice and not just by reading. This actually results in the correct layout after the animation is completed in either direction but the animation from layout 2 to layout 1 looks bad because the zIndex doesn't update till the very end of the animation. Maybe it involved reversing the order but it seems more obvious and less complicated than arithmetically recalculating the z-index. Thus, applying a greater z-index value to an HTML element relative to another HTML element places the first object in front of the second (closer to you) if they overlap. If you visualize objects on your page as a stack of sheets of paper, objects with the bigger z-indexes lie on the top of the stack.

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