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Webdesign

CSS Grid Layout: Using Grid Areas

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This post is part of a series called Understanding CSS Grid Layout.
CSS Grid Layout: Fluid Columns and Better Gutters
CSS Grid Layout: Going Responsive

One thing we’ve mentioned, but have yet to cover properly in this series is grid areas. So far our grid items have each been contained within a single grid cell, but we can achieve more useful layouts by breaking beyond those boundaries. Let’s take a look!

Defining Grid Areas

Here’s the grid we’ve been working on: nine grid items automatically placed within three equal columns, three equal rows, split by gutters of 20px.

Currently our items only have color styles, but let’s return to what we learned in the first tutorial and add some grid-column and grid-row rules, this time with something extra:

In this shorthand grid-column statement we’re effectively using grid-column-start and grid-column-end, telling the item to start at grid line 1 and end at grid line 3.

grid lines
Grid lines 1 and 3

Here’s what that gives us; the first item now spreads across two cells, pushing the other items right and down according to Grid’s auto-placement algorithm.

The same can be done with rows, which would give us a much larger area in the top left of our grid.

Spanning Cells

Using what is perhaps an easier syntax we can switch grid-column-end for the span keyword. With span we aren’t tied to specifying where the area ends, instead defining how many tracks the item should spread across:

This gives us the same end result, but if we were to change where we want the item to start we would no longer be obliged to change the end. 

In the following demo you can see we’ve emptied the layout by removing four of the items. We’ve declared positioning on two of our items: the first spans two columns and two rows, whilst the fourth starts on column 3, row 2, and spans downward across two tracks:

The remaining items fill the available space automatically. This highlights perfectly how a grid layout doesn’t have to reflect the source order of the elements.

Note: there are many situations where the source order absolutely should reflect the presentation–don’t forget about accessibility. 

Named Areas

Using the numbering methods we’ve described so far works just fine, but Grid Template Areas can make defining layouts even more intuitive.

Specifically, they allow us to name areas on the grid. With those areas named, we can reference them (instead of line numbers) to position our items. Let’s stick to our current demo for the moment and use it to make ourselves a rough page layout comprising:

  • header
  • main content
  • sidebar
  • footer

We define these areas on our grid container, almost as though we’re drawing them out:

Positioning the Items

Now we turn our attention to the items, ditching the grid-column and grid-row rules in favor of grid-area:

Our first item is slotted into the header, spanning across all three header columns. Our second item is assigned the main content area, the third becomes our sidebar, and the fourth our footer. And these needn’t follow the source order either–.item-4 could just as easily be positioned in the header area.

As you can see, this makes laying out a page much easier. In fact, while we’re in the mood for visually representing our grids, why not go even further and use emojis?!

Nesting Grid Areas

A given web page will contain all kinds of nested components, so let’s see how that works with Grid.

When we declare a grid container display: grid; only its direct descendants become grid items. Content we add to those child elements will be completely unaffected by Grid unless we specifically say otherwise. 

In our example, we’re going to add .item-5 , .item-6, and .item-7 back into the markup, nesting them in .item-2

So now we need to declare our .item-2 also a grid container, setting up its grid with two columns and two rows.

We can use the names “header”, “article”, and “sidebar” again here; there’s no confusion, because everything stays in context. These grid areas only apply to the grid within .item-2.

Conclusion

To sum up what we’ve been talking about:

  1. grid-column offers us a shorthand way of defining where an item starts and ends.
  2. We can also use the span keyword to make our rules more flexible.
  3. grid-template-areas give us the power to name our grid areas (even using emojis if the mood takes us).
  4. We can also nest grids by declaring grid items as display: grid; and following the same process.

Once again we’ve learned some useful aspects of the CSS Grid Layout spec, and we’re getting closer and closer to real world use cases! In the next tutorial we’ll look at some more complex layouts and see how responsive design fits into the equation.

Useful Resources

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