How to Maintain Consistent Item Width in Flexbox Layouts After Wrapping?

Maintaining Uniform Item Width After Flexbox Wrap

In flexbox layouts, maintaining a consistent item width across multiple lines can be challenging. However, this can be achieved through a combination of CSS properties, as described below:

CSS Properties

flex-grow

Sets the factor by which an item grows relative to other items. By setting this to 1, each item has equal growth potential.

flex-basis

Defines the initial size of an item. This determines the minimum width of the item.

max-width

Sets the maximum width of an item, ensuring it doesn't exceed its desired size.

CSS Media Queries

Media queries are used to adjust the max-width property based on viewport size, maintaining item width consistency across multiple lines.

Example

ul {
  display: flex;
  flex-wrap: wrap;
}

li {
  max-width: 100px;
  flex: 1 0 0;
}

@media (min-width: 200px) {
  li {
    max-width: 50%;
  }
}

@media (min-width: 300px) {
  li {
    max-width: 33.33333%;
  }
}

Explanation

This CSS sets the initial width of each item to 100px. It then uses media queries to adjust the max-width property as the viewport size changes, ensuring that the items maintain their desired width even when they wrap to a new line.

Alternative Solution

Flex-Wrap-Fix Mixin

A more elegant alternative is to utilize the flex-wrap-fix mixin:

@mixin flex-wrap-fix($flex-basis, $max-viewport-width: 2000px) {
  flex-grow: 1;
  flex-basis: $flex-basis;
  max-width: 100%;

  $multiplier: 1;
  $current-width: 0px;

  @while $current-width < $max-viewport-width {
    $current-width: $current-width + $flex-basis;
    $multiplier: $multiplier + 1;

    @media(min-width: $flex-basis * $multiplier) {
      max-width: percentage(1/$multiplier);
    }
  }
}

Usage

Apply the mixin to the flex item:

.flex-item {
  @include flex-wrap-fix(100px)
}

This mixin achieves the same result as the CSS media queries but eliminates the need for repetitive code and makes maintenance easier.

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