Flexbox resize and scrollable overflow

Question

I have content that I am resizing, and I want to have a fixed heading that doesn't grow/shrink and is not part of the scrollable content. With the content below becoming scrollable if there is not enough space.

The content outer wrapper (flexGrowWrapper) has a flex-grow: 1 and the inner wrapper has height: 100%; overflow-y: auto. The thought process here is that flexGrowWrapper will fill up any remaining space within the resize div, the inner wrapper will then take the full height of the flexGrowWrapper and if there is overflow, it should scroll.

What is happening is that flexGrowWrapper does grow to fill the resize area, but it seems that it's content is dictating it's min-height.

How can I make flexGrowWrapper never go beyond the resize area height?

$("button").click(function() {
 $(".resize").toggleClass("small");
});

.resize {
  height: 200px;
  display: flex;
  flex-direction: column;
  overflow-y: hidden;
  width: 300px;
}

.resize.small {
  height: 100px;
}

.heading {
  flex: 0 0 auto;
}

.flexGrowWrapper {
  border: 2px solid red;
  flex-grow: 1;
}

.wrapper {
  height: 100%;
  overflow-y: auto;
}

.content {
  display: flex;
  flex-direction: row;
  clear: both;
}

<button>
Resize
</button>
<div class="resize">
  <div class="heading">
  <label>Some heading that wont scroll</label>
  </div>
  <div class="flexGrowWrapper">
    <div class="wrapper">
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
    </div>
  </div>
</div>
<div>
 Something else here
</div>

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

Note: I looked at the this similar question, but it seems to have some differences, and I couldn't get the solutions to work for me.

kukkuz · Accepted Answer · 2019-03-22T22:54:20.943

Add min-height: 0 to .flexGrowWrapper - see demo below:

$("button").click(function() {
  $(".resize").toggleClass("small");
});

.resize {
  height: 200px;
  display: flex;
  flex-direction: column;
  overflow-y: hidden;
  width: 300px;
}

.resize.small {
  height: 100px;
}

.heading {
  flex: 0 0 auto;
}

.flexGrowWrapper {
  border: 2px solid red;
  flex-grow: 1;
  min-height: 0; /* ADDED */
}

.wrapper {
  height: 100%;
  overflow-y: auto;
}

.content {
  display: flex;
  flex-direction: row;
  clear: both;
}

<button>
Resize
</button>
<div class="resize">
  <div class="heading">
    <label>Some heading that wont scroll</label>
  </div>
  <div class="flexGrowWrapper">
    <div class="wrapper">
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
      <div class="content">
        content
      </div>
    </div>
  </div>
</div>
<div>
  Something else here
</div>

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

Why this works

Note that this is because for a column flexbox the default min-height value is auto (along the flex axis). You can see some examples of this behaviour below:

Flexbox resize and scrollable overflow

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