JavaScript Photo Gallery

An Instagram-inspired pleasantly styled photo gallery rendered on demand

Made with: JavaScript

I wanted to post a few pictures from my trips and other activities here in the site. Looking around the web for ideas I settled on a simple square format for the pictures, with a subtle frame and a gray transparent rectangle for the description placed at the bottom of the photo:

University of Miami

These are the style declarations for the photos: {
  padding: 4px;
  border: 1px solid #ccc;
  margin-bottom: 1em;
  margin-right: 2%;

.picbox {
  display: inline-block; 
  margin: 0.5em;

figure {
  margin: 0;
  position: relative;


figcaption {
  font-size: 0.85em;
  line-height: 1.5;
  color: #fff;
  background: rgba(19,43,102, .50);
  bottom: 0;
  position: absolute;
  margin-bottom: 33px;
  margin-left: 5px;
  padding: 0.6em;
  box-sizing: border-box; 

Since I’m using a mobile first approach, the style declarations above apply to small screens. For screen sizes 769px and up I created a media query slightly modifying the size of the pictures:

@media (min-width: 769px) { {
  width: 300px;

I placed the pictures in my img folder and then created a JSON file with the url and description of each picture. Every time I want to add a picture to the gallery, I add a new member at the top of the object.

Finally, I created the following JavaScript script that renders the images in the gallery. The script uses the fetch() method to pull the information from the JSON file and then parses it to convert it into a JavaScript object (in this case an array). It then maps over the array and builds the HTML elements that hold the gallery and the pictures. Once the map function is done, the HTML is placed in the proper place in the photos HTML template via the document.getElementById() method.

By using a small script we avoid having to hard code the HTML page every time we want to add a picture.

To see the gallery in action click here.

Last updated: Jan 8, 2020

© 2024 Mario Sanchez Carrion