I am trying to build my own carousel with pure JavaScript.
I'm struggling with picking up the most efficient way to add an infinite carousel
option.
For some reasons, every element (photo, generic object) must have an id
The algorithm I see goes like that:
- If the user is scrolling to the last object (to right) then append
the first DOM object to the array back
- If the user is scrolling to
the first object (to left) then add the last DOM child to array
front.
Is this going to work? Is there any other efficient way of doing an infinite carousel?
I have also heard that it's better to use translate property rather than changing the left, right properties, so it there would be more work for the GPU than for CPU.
I created a simple slider with css transformations as the animation technique and plain Javascript.
var img = document.getElementsByClassName("img")[0];
img.style.transform = 'translate('+value+'px)';
You can test it in this codepen snippet. http://codepen.io/TobiObeck/pen/QKpaBr
A press on a button translates all images in the respective direction along the x-axis. An image on the edge, is set transparent outerImg.style.opacity = '0';
and translated to the other side. You can add or remove image elements in HTML and it still works.
In this second codepen snippet you can see how it works. The opacity
is set to 0.5
so it is observable which image switches the side. Because overflow: hidden
is removed, you can see how the images on the edge enqueue on the other side.
http://codepen.io/TobiObeck/pen/WGpdLE
Moreover it is notworthy that it is checked wether the animation is complete, otherwise the simultaneously added translations would look odd. Therefore a click won't trigger another animation until unless the animation is completed.
img.addEventListener("transitionend", transitionCompleted, true);
var transitionCompleted = function(){
translationComplete = true;
}
leftBtnCLicked(){
if(translationComplete === true){
//doAnimation
}
}