Adjusting Flexbox Sidebar to Match Content Height

I'm facing an issue with my layout where the sidebar sometimes becomes taller than the page body, extending beyond the screen height and continuing to expand vertically.

Here's a snippet of my code structure:

<div class="fb-col">
    <!-- Headers, etc. -->
    <div class="fb-row">
        <div class="sidebar">
            <!-- Lots of content -->
        </div>
        <div class="main">
            <!-- Less content -->
        </div>
     </div>
     <!-- Footers -->
</div>

Supported by this CSS styling:

.fb-col {
    height: 100%;
    display: flex;
    flex-direction: column;
}
.fb-row {
    flex-grow: 1;

    display: flex;
    flex-direction: row;
    align-items: flex-start;
}
.sidebar {
    width: 25%;
    flex-grow: 0;
}
.main {
    flex-grow: 1;
}

Although these settings prevent both elements from growing too much in height, I'm struggling to make the sidebar stop expanding when the content is short.

htmlcssflexbox

Answer №1

If your aim is clear, it seems that using flexbox (or any CSS) alone may not be sufficient to achieve this without preset dimensions. Flexbox can expand the smaller element(s) but not shrink the larger ones.

flex-grow and flex-shrink dictate the sizing based on the main axis, which is horizontal for flex-direction: row.

The most viable solution would involve incorporating some JS/jQuery:

$(document).ready(function() {
$(".sidebar").height($(".main").height());
});
.fb-col {
display: flex;
flex-direction: column;
}

.fb-row {
display: flex;
flex-direction: row;
align-items: flex-start;
}

.sidebar {
min-width: 25%;
width: 25%;
overflow: auto;
}

.main {
}
/* For illustrative purposes */
.fb-row {
background-color: #FDD;
}

.sidebar {
background-color: #DFD;
}

.main {
background-color: #DDF;
}
<div class="fb-col">
<header><h1>Header</h1></header>
<div class="fb-row">
<div class="sidebar">
<h2>Sidebar</h2>
<nav>
<ul>

------ Snippet shortened for brevity ------

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Answer №2

If you're facing an issue, consider approaching it using the following method:

.fb-col {
    min-height: 100%;
    display: flex;
    flex-direction: column;
}
.fb-row {
    flex-grow: 1;
    display: flex;
    flex-direction: row;
    min-height: 100%;
}
.sidebar {
    width: 25%;
    flex-grow: 0;
    min-height: 100%;
}
.main {
    flex-grow: 1;
    min-height: 100%;
}

By implementing this code, both .sidebar and .main will maintain equal heights with a minimum of 100%.

If the above solution does not work, you can try incorporating the following rule:

html, body {
  height: 100%;
  margin: 0;
}

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