Have you ever clicked on an image on a webpage that opens up a larger version of the image with navigation to view other photos?
Some folks call it a pop-up. Others call it a lightbox. Bootstrap calls it a modal. I mention Bootstrap because I want to use it to make the same sort of thing. So, let’s call it a modal from here on out.
Why Bootstrap? you might ask. Well, a few reasons:
- I’m already using Bootstrap on the site where I want this effect, so there’s no additional overhead in terms of loading resources.
- I want something where I have complete and easy control over aesthetics. Bootstrap is a clean slate compared to most modal plugins I’ve come across.
- The functionality I need is fairly simple. There isn’t much to be gained by coding everything from scratch. I consider the time I save using the Bootstrap framework to be more beneficial than any potential drawbacks.
Here’s where we’ll end up:
Let’s go through that, bit by bit.
Step 1: Create the image gallery grid
Let’s start with the markup for a grid layout of images. We can use Bootstrap’s grid system for that.
Now we need data attributes to make those images interactive. Bootstrap looks at data attributes to figure out which elements should be interactive and what they should do. In this case, we’ll be creating interactions that open the modal component and allow scrolling through the images using the carousel component.
About those data attributes:
- We’ll add
data-target="#exampleModal"to the parent element
(#gallery). This makes it so clicking anything in the gallery opens the modal. We should also add the data-target value (
#exampleModal) as the ID of the modal itself, but we’ll do that once we get to the modal markup.
- Let’s add
data-slide-toattribute to each image. We could add those to the image wrappers instead, but we’ll go with the images in this post. Later on, we’ll want to use the data-target value (
#carouselExample) as the ID for the carousel, so note that for when we get there. The values for
data-slide-toare based on the order of the images.
Here’s what we get when we put that together:
Interested in knowing more about data attributes? Check out the CSS-Tricks guide to them.
Step 2: Make the modal work
This is a carousel inside a modal, both of which are standard Bootstrap components. We’re just nesting one inside the other here. Pretty much a straight copy-and-paste job from the Bootstrap documentation.
Here’s some important parts to watch for though:
- The modal ID should match the
data-targetof the gallery element.
- The carousel ID should match the
data-targetof the images in the gallery.
- The carousel slides should match the gallery images and must be in the same order.
Here’s the markup for the modal with our attributes in place: