Problem with CSS: The height of the outer div is not being affected by the height of the inner ones

There is a mystery that needs to be solved...

I have a basic layout for a webform - header, content, and footer. Inside the content div, I've placed a div intended to hold a flyout menu. However, the content div does not inherit the height of the menu's div as expected. Strangely, the menu div does correctly align with the borders of the content div. Upon inspecting the element, it appears that the height of the content div is 0.

Here is some code snippets:

<body>
    <form id="formMaster" runat="server">
    <div id="header">
        bla bla
    </div>
    <div id="main">
        <div>
            <ucCatMenu:MenuControl ID="CatMenu" runat="server" />
        </div>
    </div>
    <div id="footer">
        bla bla
    </div>
    </form>
</body>

Additionally, here is the full code for the menu's web user control:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="wucCategoriesMenu.ascx.cs"
    Inherits="Controls_wucCategoriesMenu" %>
<!-- CSS Code for flyout menu -->
<style type="text/css">
    /* CSS styles go here */
</style>
<div>
    <ul id="flyout">
       <li><a class="fly" href="/globalop/pages/CatPage.aspx">category<b></b></a>
            <ul>
                <li><a href="#url">sub category</a></li>
                <li><a href="#url">sub category</a></li>
                ...
            </ul>
        </li>
        <li><a class="fly" href="/globalop/pages/CatPage.aspx">category<b></b></a>
            <ul>
                <li><a href="#url">sub category</a></li>
                <li><a href="#url">sub category</a></li>
                ...
            </ul>
        </li>
    </ul>
</div>

In conclusion, despite following examples and code closely, I'm still experiencing issues with the height of the "main" div not adjusting to fit the menu's div. Any insights or solutions would be greatly appreciated. Thank you in advance.

Answer №1

Hey there! It looks like you've set the float for the child divs without clearing the parent div first. Remember to always clear the parent div when using floats in the child divs...

Now that your main div is cleared, it should properly maintain its height.

If you'd like to see the updated HTML and CSS code, check out this fiddle: http://jsfiddle.net/ABCD123/2/

Answer №2

The reasoning behind this is that your flyout menu has the CSS property float:right;

As a result, this particular element is taken out of the normal document flow and therefore does not contribute any height to the parent element.

To rectify this issue, you should place the following piece of code after your flyout menu so as to instruct the browser to clear the float and resume the regular layout:

<div style="clear:both;"></div>

Edit: Complete HTML markup

<body>
    <form id="formMaster" runat="server">
    <div id="header">
        Placeholder text
    </div>
    <div id="main">
        <div>
            <ucCatMenu:MenuControl ID="CatMenu" runat="server" />
        </div>
        <div style="clear:both;"></div>
    </div>
    <div id="footer">
        Placeholder text
    </div>
    </form>
</body>

Answer №3

One possible solution to your issue is by using the inherit property like demonstrated here

<div class="element1" style="width:inherit; height:inherit">

Feel free to try this out as needed ... :)

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