Achieving the full height of a parent element for a relatively positioned child

I am trying to create a layout with specific height requirements. Here is the code snippet:

body, html {
  height: 90%;
}
#content{
  width: 100%;
  height: 100%;
}

#sidebar {
  position: relative;
  width: 200px;
  float: left;
  height: 100%;
  background-color: green;
}
#sidebar-content {
  height: 120px;
  background-color: blue;
  
}
#sidebar-footer {
  position: absolute;
  bottom: 0;
  height: 50px;
  width: 100%;
  background-color: black;
}

#main {
  position: relative;
  overflow: hidden;
  background-color: red;
}
#main-content {
   height: 750px;
}
<div id="content">
  <div id="sidebar">
    <div id="sidebar-content">
    </div>
    <div id="sidebar-footer">
    </div>
  </div>
  <div id="main">
    <div id="main-content">
    </div>
  </div>  
</div>

I am facing an issue where I want the sidebar to occupy all available height without specifying parent height in pixels. Setting the sidebar position to absolute can solve this, but it introduces bugs. Is there a way for the relatively positioned child to take up the full height of the parent without having to specify the parent's height?

In the provided fiddle example, when the #main content exceeds the sidebar's width, the sidebar appears shorter than intended. The goal is for the sidebar to fill the entire height regardless of the main content size.

Answer №1

If you're looking to tackle your layout issues, look no further than CSS Flexbox. It's a game-changer, as long as you can leave behind those outdated browsers.

Simply including display: flex in your container will work wonders for organizing your content efficiently.

Keep in mind that different browsers have varying levels of support for flexbox, so be sure to inspect the compiled CSS on your project to catch any necessary browser prefixes.

Check out this CodePen demo

Answer №2

If you're looking for a solution using jQuery, this might be just what you need! Check out this JSFiddle link that will help set the height of the #sidebar to match the height of the container. Happy coding!

Here's the jQuery code:

$(document).ready(function(){
    var wrapH = $('#content').outerHeight();

    $('#sidebar').css("height", wrapH);
});

After some edits:

Updated JSFiddle Link

$(document).ready(function(){
    var wrapH = $('#main').outerHeight();

    $('#sidebar').css("height", wrapH);
});

Simply switch 'content' to 'main' in your code and it should resolve the issue by setting the sidebar height equal to the main height.

Answer №3

If you are struggling with the position:absolute attribute due to the float:left, consider using a combination of CSS properties for better results.

Check out this code snippet for some helpful positioning and width declarations that could be beneficial for your project:

body,
html {
  height: 90%;
}
#content {
  width: 100%;
  height: 100%;
  position: relative;
  background: lightgray;
}
#sidebar {
  position: absolute;
  width: 200px;
  height: 100%;
  top: 0;
  left: 0;
  background-color: green;
  z-index: 8;
}
#sidebar-content {
  height: 120px;
  background-color: blue;
}
#sidebar-footer {
  position: absolute;
  bottom: 0;
  height: 50px;
  width: 100%;
  background-color: black;
}
#main {
  overflow: hidden;
  background-color: red;
  height: 100%;
  position: absolute;
  top: 0;
  left: 200px;
  width: calc(100% - 200px);
  height: 100%;
  z-index: 10;
}
#main-content {}
<div id="content">
  <div id="sidebar">
    <div id="sidebar-content">
    </div>
    <div id="sidebar-footer">
    </div>
  </div>
  <div id="main">
    <div id="main-content">this is the main content
    </div>
  </div>
</div>

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