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December 13, 2019 07:03
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Z-index mixin for LESS
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| @z-index-order: 'contact', 'lightbox', 'nav'; | |
| .zindex(@elementName) { | |
| .loop(@elementName, @counter) when (@counter > 0) { | |
| .loop(@elementName, @counter - 1); | |
| .pickIndex(@elementName, @counter); | |
| } | |
| .loop(@elementName, length(@z-index-order)); | |
| .pickIndex(@elementName, @counter) when (extract(@z-index-order, @counter) = @elementName) { | |
| z-index: @counter * 100; | |
| } | |
| } | |
| // usage | |
| nav { | |
| .zindex('nav'); | |
| } | |
| // output: nav{z-index:300} |
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no reason to multiply by 100 the @counter, if you use this mixin you will never need to define a z-index manually.
Also, doing so, makes the illusion that you can rely on the gap between the z-indexes to insert an arbitrary z-index manually, but if you do so, when you'll add a new element to the @z-index-order, everything will break.