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Web site Developer I Advertising and marketing I Social Media Advertising and marketing I Content material Creators I Branding Creators I Administration I System SolutionAn Auto-Filling CSS Grid With Max Columns of a Minimal Measurement | CSS-Tips

Web site Developer I Advertising and marketing I Social Media Advertising and marketing I Content material Creators I Branding Creators I Administration I System SolutionAn Auto-Filling CSS Grid With Max Columns of a Minimal Measurement | CSS-Tips

Web site Developer I Advertising and marketing I Social Media Advertising and marketing I Content material Creators I Branding Creators I Administration I System Resolution

Inside Drupal 10 core, we’re implementing a brand new auto-filling CSS Grid method that I believe is cool sufficient to share with the world.

The necessities are:

  • The person specifies a most variety of columns. That is the auto-filling grid’s “pure” state.
  • If a grid cell goes below a user-specified width, the auto-filling grid will readjust itself and reduce the variety of columns.
  • The grid cells ought to at all times stretch to suit the auto-filling grid container’s width, regardless of the column depend.
  • All of this could work impartial of viewport width and mustn’t require JavaScript.

Screenshot showing the auto-filling CSS Grid's settings in Drupal.

The auto-filling CSS Grid in motion

Right here’s how the ensuing auto-filling CSS grid behaves when it’s compressed by the draggable div component to its left.

Right here’s the code

Should you’re not searching for the speculation behind the auto-filling grid, and simply wish to copy/paste code, right here you go!

.grid-container {
  /**
   * Consumer enter values.
   */
  --grid-layout-gap: 10px;
  --grid-column-count: 4;
  --grid-item--min-width: 100px;

  /**
   * Calculated values.
   */
  --gap-count: calc(var(--grid-column-count) - 1);
  --total-gap-width: calc(var(--gap-count) * var(--grid-layout-gap));
  --grid-item--max-width: calc((100% - var(--total-gap-width)) / var(--grid-column-count));

  show: grid;
  grid-template-columns: repeat(auto-fill, minmax(max(var(--grid-item--min-width), var(--grid-item--max-width)), 1fr));
  grid-gap: var(--grid-layout-gap);
}

Principle and instruments behind the auto-filling CSS Grid

The code above makes use of a number of trendy CSS instruments together with CSS Grid’s repeat(), auto-fill(), and minmax() capabilities, in addition to the CSS max(), and calc() capabilities. Right here’s the way it works.

CSS Grid’s auto-fill() operate

The important thing to all of that is auto-fill(). We’d like every row to replenish with as many columns as potential. For more information on auto-fill, take a look at Sara Soueidan’s superior article on the distinction between auto-fill and auto-fit, which incorporates this beneficial video displaying the way it works.

However the way to we be sure that it doesn’t fill in too many columns?

The CSS max() operate

That’s the place the max() operate is available in! We would like every grid cell’s width to max out at a sure share, say 25% for a four-column grid. However, we will’t have it go under the user-specified minimal width.

So, assuming a four-column grid and minimal cell width of 100px, the max() operate would look one thing like: max(25%, 100px).

Nevertheless, the 25% worth remains to be not fairly appropriate as a result of it doesn’t take the grid gaps into consideration. What we actually want is one thing like this as an alternative:

max(calc(25% - <grid-gap-for-one-cell>), 100px)

We are able to calc()-ulate this in CSS! (Who says CSS isn’t programming?)

--gap-count: calc(var(--grid-column-count) - 1);
--total-gap-width: calc(var(--gap-count) * var(--grid-layout-gap));
--grid-item--max-width: calc((100% - var(--total-gap-width)) / var(--grid-column-count));

Now we’ve got one other key to creating this work! This can inform the grid cell to go to its most width — which takes into consideration the user-specified columns) — however won’t ever go below 100px.

max(100px, var(--grid-item--max-width))

Be taught extra in regards to the max() operate with Chris Coyier’s article on the CSS min(),max(), and clamp() capabilities.

CSS Grid’s minmax() operate

We’re getting shut, however there’s one key ingredient that’s lacking: The grid doesn’t at all times stretch to its mother or father’s container’s width.

That is precisely what the minmax() operate is designed to do. The next CSS will set the minimal width to the <grid-item-width>, and if it has room, it’ll stretch all of the cells out equally to suit the mother or father’s width!

minmax(<grid-item-width>, 1fr)

Let’s put all of it collectively and make some magic!

Utilizing the instruments above, we will put collectively this magic little bit of code that does precisely what we would like!

--gap-count: calc(var(--grid-column-count) - 1);
--total-gap-width: calc(var(--gap-count) * var(--grid-layout-gap));
--grid-item--max-width: calc((100% - var(--total-gap-width)) / var(--grid-column-count));

grid-template-columns: repeat(auto-fill, minmax(max(var(--grid-item--min-width), var(--grid-item--max-width)), 1fr));

CSS is enjoyable!

CSS has actually come a good distance. I had numerous enjoyable engaged on this, and I’m so glad that use-cases like this are actually potential with out using JavaScript.

Particular due to Andy Blum, who recommended auto-fill() over auto-fit(). Additionally, an especially particular due to all the implementors and spec writers who make superior capabilities like this standardized and potential.

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