How to make box1 fill the remaining space after box2 is excluded? or: How does box1 fill the remaining space and exclude the area occupied by box2?

How to make box1 fill the remaining space after excluding box2?

This article will explore how to achieve a layout effect: box1 element occupies the remaining space, and after excluding the area occupied by box2 element, it will still fill the parent container. The initial code given in the question uses inline-block to cause box1 and box2 to be arranged vertically, rather than the expected horizontal arrangement and box1 takes up the remaining space. In order to achieve the expected results, we need to adjust the layout method.

There are two solutions provided in the article:

Solution 1: Use the calc() function

This scheme retains the display: inline-block setting in the original code, and calculates the width of box1 through the CSS calc() function. The calc() function allows us to perform simple mathematical operations, where we use the parent container width to subtract box2's width (200px) to calculate the width of box1. The code is as follows:

#box1 {
  width: calc(100% - 200px);
}

It should be noted that this method requires knowing the width of box2 in advance. If the width of box2 changes dynamically, the value in calc() needs to be dynamically adjusted according to the actual situation.

Solution 2: Use Flex layout

This solution utilizes Flex layout to achieve more flexible layout control. Allocate remaining space for box1 by setting the parent container #content to the Flex container and using flex: 1. Meanwhile, flex-shrink: 0 prevents box2 from being compressed. The code is as follows:

#content {
  display: flex;
  flex-direction: row;
}

#box1 {
  flex: 1;
}

#box2 {
  flex-shrink: 0;
  width: 200px;
}

Flex layouts provide stronger layout capabilities, allowing more convenient handling of the needs of elements of different sizes and responsive layouts. Compared with Solution 1 and Solution 2, it is more flexible and easier to maintain.

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