Ensure that the flex item extends across the entire width of the row

I need to keep the first 2 child elements on the same row while placing the third element below at full width, all using flex.

My focus is on utilizing the flex-grow and flex-shrink properties for the first 2 elements without relying on percentages. However, the third element must be full width and positioned below the first two.

The addition of a programmatic label element after the text element in case of an error complicates the situation as I cannot modify existing code.

How can I ensure that the label element spans 100% width beneath the other two elements positioned with flex?

.parent {
  display: flex;
  align-items: center;
  width: 100%;
  background-color: #ececec;
}

.parent * {
  width: 100%;
}

.parent #text {
  min-width: 75px;
  flex-shrink: 2.25;
}
<div class="parent">
  <input type="range" id="range">
  <input type="text" id="text">
  <label class="error">Error message</label>
</div>

Answer №1

To make a flex item fill an entire row, simply set its width to 100% or use flex-basis: 100%, and ensure that you have enabled wrapping on the container.

With these settings, the item will take up all available space, causing its siblings to be pushed onto new rows.

.parent {
  display: flex;
  flex-wrap: wrap;
}

#range, #text {
  flex: 1;
}

.error {
  flex: 0 0 100%;
  border: 1px dashed black;
}
<div class="parent">
  <input type="range" id="range">
  <input type="text" id="text">
  <label class="error">Error message (takes full width)</label>
</div>

For further details: By default, the flex-wrap property's initial value is nowrap, meaning items align in a single row. Refer to this MDN link for more information.

Answer №2

Depending on the situation,

  1. If it's flex-direction: row (which is the default) on the parent container
  • Consider using justify-self: stretch on the child to make it full width
  1. If it's flex-direction: column on the parent container -Try using align-self: stretch on the child you want to be full width

This solution may be helpful in certain situations and has proven effective for me in the past.

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