LazyLoad

Overview

The LazyLoad component defers the loading of off-screen content (like images, videos, or heavy components) until it is about to enter the viewport.
This improves initial page load times and enhances performance.

Preview

Preview

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Code

<LazyLoad 
  threshold="0px"
  animation="fade"
  once={false}
  placeholder={<div className="p-6 text-center">Loading...</div>}
>
  <div className="bg-gray-200 rounded-lg shadow text-center p-10">
    Your Content
  </div>
</LazyLoad>

Installation

CLI

ignix add component lazyload

manual

import React, { useEffect, useRef, useState } from "react";

export interface LazyLoadProps {
children: React.ReactNode;
className?: string;
threshold?: string; // e.g. "100px"
placeholder?: React.ReactNode;
once?: boolean;
animation?: "fade" | "slide" | "none";
}

export const LazyLoad: React.FC<LazyLoadProps> = ({
children,
className,
threshold = "0px",
placeholder = null,
once = true,
animation = "none",
}) => {
const ref = useRef<HTMLDivElement | null>(null);
const [isVisible, setIsVisible] = useState(false);

useEffect(() => {
if (!ref.current) return;

const observer = new IntersectionObserver(
  (entries) => {
    entries.forEach((entry) => {
      if (entry.isIntersecting) {
        setIsVisible(true);
        if (once) {
          observer.disconnect(); // unobserve after first load
        }
      } else if (!once) {
        setIsVisible(false); // re-hide if once=false
      }
    });
  },
  { rootMargin: threshold }
);

observer.observe(ref.current);

return () => observer.disconnect();
}, [threshold, once]);

// Animation classes
const animationClass =
animation === "fade"
  ? "transition-opacity duration-700 ease-in-out opacity-0 data-[visible=true]:opacity-100"
  : animation === "slide"
  ? "transition-transform duration-700 ease-in-out translate-y-4 opacity-0 data-[visible=true]:translate-y-0 data-[visible=true]:opacity-100"
  : "";

return (
<div
  ref={ref}
  className={`${className ?? ""} ${animationClass}`}
  data-visible={isVisible}
>
  {isVisible ? children : placeholder}
</div>
);
};

Usage

Import the component:

import { LazyLoad } from './components/ui';

Example usage:

<LazyLoad 
  threshold="100px" 
  animation="fade" 
  once={true}
  placeholder={<Skeleton />}
>
  <HeavyContent />
</LazyLoad>

Props

Prop	Type	Default	Description
children	React.ReactNode	required	The content to lazy load.
className	string	""	Custom CSS class names.
threshold	string	"100px"	Distance from the viewport to start loading (e.g., "0px", "200px").
placeholder	React.ReactNode	null	Placeholder shown until the content is loaded.
once	boolean	true	If true, content loads only once. If false, it toggles visibility when entering/exiting viewport.
animation	"fade" | "slide" | "none"	"fade"	Animation effect applied when content appears.