How to make flexbox child's height to fit to content instead of 100% height of its container

Fei Sun Published at Dev

Fei Sun

#container {
  display:flex;
  height:300px;
  background:#333;
}
#child1 {
  width:30%;
  background:#3cf;
}
#child2 {
  width:30%;
  background:#3fc;
}
#child3 {
  width:40%;
  background:#cf3;
}
#child1_child {
  width:100%;
  background:#fc3;
}
pre {
  margin:0px;
}

    <div id="container">
    <div id="child1"><div id="child1_child"><pre>CONTENT<BR>CONTENT<BR>CONTENT<BR>CONTENT</pre></div></div>
    <div id="child2"></div>
    <div id="child3"></div>
    </div>

The height of #child1 is automatically set to the same height of #container, How can I make it to fit to #child1_child rather than 100% height of #container?

The height of #child1_child is not static, it can be changed by content inside of it, height of #child1 with static value is useless.

zer00ne

fit-content is limited in support; IE won't ever support it, and Firefox still requires a prefix. This solution has jQuery for demo purposes only and is not required for the solution. There are four choices:

NONE: No extra styles on .A

FIT-CONTENT: Adds the CSS property fit-content on .A

MAX-CONTENT: Adds the CSS property max-content on .A

TABLE: Adds the CSS property display:table on .A

Option 2 and 3 behave identically , so in conclusion the simplest solution is to apply display:table and it's incredibly compatible as it is simple. height: fit-content and max-content is almost as compatible with one minor caveat being that IE does not support it (IE is going the way of the dinosaur so it's pretty much a non issue).

Demo

$('.rad').on('change', switchStyle);

function switchStyle(e) {
  var pick = $(this).val();
  switch (pick) {
    case 'nil':
      $('.A').removeClass('fit max tab');
      break;
    case 'fit':
      $('.A').addClass('fit').removeClass('max tab');
      break;
    case 'max':
      $('.A').addClass('max').removeClass('fit tab');
      break;      
    case 'tab':
      $('.A').addClass('tab').removeClass('fit max');
      break;
    default:
      break;
  }
}

.box {
  display: flex;
  height: 300px;
  background: #333;
}
.A {
  width: 30%;
  background: #3cf;
}
.B {
  width: 30%;
  background: #3fc;
}
.C {
  width: 40%;
  background: #cf3;
}
.A1 {
  width: 100%;
  background: #fc3;
}
pre {
  margin: 0px;
}
.set {
  position: relative;
  z-index: 1;
  bottom: 300px;
  left: 30%;
  width: 30ch;
  font: 400 16px/1.428 Verdana;
}
.A.fit {
  height: -moz-fit-content;
  height: -webkit-fit-content;
  height: -fit-content;
}
.A.max {
  height: max-content;
}
.A.tab {
  display: table;
}

<div class="box">
  <div class="A">
    <div class="A1"><pre>
    CONTENT
    CONTENT
    CONTENT
    CONTENT</pre>
    </div>
  </div>
  <div class="B"></div>
  <div class="C"></div>
</div>

<fieldset class='set'>
  <label>NONE
    <input class='rad' name='rad' type='radio' value='nil' checked>
  </label>
  <label>FIT-CONTENT
    <input class='rad' name='rad' type='radio' value='fit'>
  </label><br>
  <label>MAX-CONTENT
    <input class='rad' name='rad' type='radio' value='max'>
  </label>  
  <label>TABLE
    <input class='rad' name='rad' type='radio' value='tab'>
  </label>
</fieldset>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

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edited at2021-02-25

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