Tips on wrapping a div snugly around an image while also adjusting the image size to fit within the content area if it is larger than the content area

Question

Tips on wrapping a div snugly around an image while also adjusting the image size to fit within the content area if it is larger than the content area

Currently working on developing an image viewer that has specific requirements to meet. Here they are:

The content area is defined as a grid-area.
If the image is larger than the content area, it must be contained without stretching.
If the image is smaller than the content area, it should be centered within the content area.
Ensure there is always a div tightly wrapping the image.

A visual representation has been sketched below to illustrate the desired behavior for both portrait (top row) and landscape (bottom row) images with the left column demonstrating the expected behavior when the image's resolution exceeds the content area.

Color coding is as follows:

White box: Content area.
Red box: Image.
Blue border: Wrapping div around the image.

https://i.sstatic.net/dzHpo.png

My primary approach thus far has involved absolutely positioning the wrapping div around the image, which generally works fine except when attempting to achieve resize-to-fit behavior. This often results in breaking the tightly wrapped div.

Although I can utilize JavaScript for this task, I would prefer to primarily rely on HTML and CSS due to laying a foundation for future expansions.

javascript html css

Answer 1

Answer №1

It is important to make sure that your div adjusts its size based on the content within it, such as an img. Avoid using absolute positioning in this case. If you are considering using grid, the example below demonstrates how to create a grid layout with a main section surrounded by 20px padding. Use the max value for the img to prevent it from exceeding the size of the grid box and center it within the grid:

const width = document.querySelector( '[name=width]' );
const height = document.querySelector( '[name=height]' );
const image = document.querySelector( 'img' );

function onchange(){
  
  image.src = `http://placehold.it/${width.value}x${height.value}`;
  image.style = '';
  
}

width.addEventListener( 'change', onchange );
height.addEventListener( 'change', onchange );

window.addEventListener( 'DOMContentLoaded', () => setTimeout( onchange, 100 ) );

body, html { height: 100%; }
body { padding: 0; margin: 0; }
main {
  display: grid;
  grid-template: "left top right" 20px "left main right" 1fr "left bottom right" 20px / 20px 1fr 20px;
  height: 100%;
}
main div {
  grid-area: main;
  border: 1px solid red;
  display: inline;
  align-self: center;
  justify-self: center;
}
main div img {
  max-width: 100%;
  max-height: 100%;
  display: block;
}
#inputs {
  position: absolute;
  top: 0;
  left: 0;
  transform: translateY(-100%);
  transition: transform .4s;
  width: 100%;
  padding: 10px;
  background: black;
  color: white;
}
body:hover #inputs {
  transform: translateY(0);
}

<main>
  <div>
    <img />
  </div>
</main>

<div id="inputs">
  <label>Width: <input name="width" value="200" type="number" /></label>
  <label>Height: <input name="height" value="200" type="number" /></label>
</div>

To enable testing of different image sizes, JavaScript has been included. The addition of img.style = '' triggers a CSS recalculation after inserting the new image, ensuring correct sizing upon load.

Answer 2

It is important to make sure that your div adjusts its size based on the content within it, such as an img. Avoid using absolute positioning in this case. If you are considering using grid, the example below demonstrates how to create a grid layout with a main section surrounded by 20px padding. Use the max value for the img to prevent it from exceeding the size of the grid box and center it within the grid:

const width = document.querySelector( '[name=width]' );
const height = document.querySelector( '[name=height]' );
const image = document.querySelector( 'img' );

function onchange(){
  
  image.src = `http://placehold.it/${width.value}x${height.value}`;
  image.style = '';
  
}

width.addEventListener( 'change', onchange );
height.addEventListener( 'change', onchange );

window.addEventListener( 'DOMContentLoaded', () => setTimeout( onchange, 100 ) );

body, html { height: 100%; }
body { padding: 0; margin: 0; }
main {
  display: grid;
  grid-template: "left top right" 20px "left main right" 1fr "left bottom right" 20px / 20px 1fr 20px;
  height: 100%;
}
main div {
  grid-area: main;
  border: 1px solid red;
  display: inline;
  align-self: center;
  justify-self: center;
}
main div img {
  max-width: 100%;
  max-height: 100%;
  display: block;
}
#inputs {
  position: absolute;
  top: 0;
  left: 0;
  transform: translateY(-100%);
  transition: transform .4s;
  width: 100%;
  padding: 10px;
  background: black;
  color: white;
}
body:hover #inputs {
  transform: translateY(0);
}

<main>
  <div>
    <img />
  </div>
</main>

<div id="inputs">
  <label>Width: <input name="width" value="200" type="number" /></label>
  <label>Height: <input name="height" value="200" type="number" /></label>
</div>

To enable testing of different image sizes, JavaScript has been included. The addition of img.style = '' triggers a CSS recalculation after inserting the new image, ensuring correct sizing upon load.

Tips on wrapping a div snugly around an image while also adjusting the image size to fit within the content area if it is larger than the content area

Answer №1

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