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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <div class="container" id="container"><div id="grid" class="grid"></div></div>
              
            
!

CSS

              
                * {
  box-sizing: border-box;
}
body {
  margin: 0;
  padding: 0;
  overflow: hidden;
}
span {
  position: fixed;
  z-index: 5000;
  top: 0;
  left: 0;
  width: 50px;
  height: 50px;
  background: white;
}
.container {
  top: 0;
  left: 0;
  position: fixed;
  display: block;
  overflow:hidden;
  width: 100%;
  height: 100vh;
}
.grid {
  display: grid;
  width: 100%;
  height: 100%;
  overflow: hidden;
  curser: grab;
}
.grid:active{
  cursor: grabbing;
}

.grid-item {
  background: #fffff05;
  background-size: cover;
  user-select: none;
  pointer-events: none;
  overflow: hidden;
  background-position: 50%;
}
.grid-item img {
  width: 100%;
  height: 100%;
}
              
            
!

JS

              
                // Uses css grid for the items for no apparent reason
// Original idea, with less issues from https://codepen.io/radixzz/pen/eRJKXy

console.clear();

let photos = Array.from({length: 26}, (v,i)=> i).map( i => `https://anemolo-codepen.s3.amazonaws.com/thumb_${i}.jpg` ) 
// The infinite grid changes the img.src for all images on a jump.
// And downloading that new images shows a flash. Even if it's a blob, or saved on storage
// So, I just convert the images > blobs > dataURI to make the flash go away.
// The drawback is that it doesn't work with large images
photos = photos.map( (src,i) => {
  return fetch(src).then(r => r.blob()).then((blob)=>{
    // Yolo swag blobs
    let reader  =  new FileReader();
    reader.readAsDataURL(blob);
    
    return new Promise( (resolve, reject) =>{
      reader.onload = function(){
        resolve(reader.result);
        //Hopefully this does not cause a memory leak :b
        photos[i] = reader.result;
      }
      reader.onerror = function(){
        reject('Error on reader');
        //Hopefully this does not cause a memory leak :b
        photos[i] = '';
      }
    });
  })
})


class GridItem  {
  constructor(index = 0){
    this.item = document.createElement('div');
    // this.item.append(document)
    this.img = document.createElement('img');
    this.index = index;
    this.setImage();
    // console.log(index)
    
    
    // this.item.append(this.img);
    this.item.classList.add('grid-item');
  }
  setIndex(index){
    this.index = index;
    this.setImage()
  }
  setImage(){
    let image = photos[(this.index % photos.length)];
    if(Object.prototype.toString.call(image) === "[object String]" ){
      this.item.style.backgroundImage = `url(${image})`;
    } else {
      image.then((src)=>{
        this.item.style.backgroundImage = `url(${src})`;
      })
    }
  }
}
class Drag {
  constructor(ele, handleDrag){
     this.dragging = false;
    this.lastX = null;
    this.lastY = null;
    this.handleDrag = handleDrag;
    
    ele.addEventListener('touchstart', this.onStart.bind(this), false);
    ele.addEventListener('touchmove', this.onMove.bind(this), false);
    ele.addEventListener('touchend', this.onEnd.bind(this), false);
    
    ele.addEventListener('mousedown', this.onStart.bind(this))
    ele.addEventListener('mousemove', this.onMove.bind(this));
    ele.addEventListener('mouseup', this.onEnd.bind(this));
    ele.addEventListener('mouseuot', this.onEnd.bind(this));
  }
  onStart(ev){
    ev = ev.type == 'touchstart' ? ev.touches[0] : ev;
    
    this.dragging = true;
    this.lastX = ev.clientX;
    this.lastY = ev.clientY;
    
  }
  onMove(ev){
    
    if(!this.dragging) return; 
    
    
    ev = ev.type == "touchmove" ? ev.touches[ 0 ] : ev;
    let xDelta = ev.clientX - this.lastX;
    let yDelta = ev.clientY - this.lastY;
    let vel = Math.abs(xDelta * yDelta);
    if(vel > 50){
      let v = {x: xDelta * 0.5, y:yDelta * 0.5};
      if(this.anime) this.anime.pause();
      this.anime = anime(
      {targets: v,
        x: 0,
        y: 0,
       update: (anim)=>{
         this.handleDrag(v.x,v.y)
       }
      }
      )
    }
    this.handleDrag(xDelta, yDelta);
    this.lastX = ev.clientX;
    this.lastY = ev.clientY;
    
  }
  onEnd(ev){
    this.dragging = false;
    
  }
}
class InfiniteGrid {
  constructor(nCol = 2, nRow = 2){
    this.grid = document.getElementById('grid');
    this.container = document.getElementById('container');
    this.Drag = new Drag(this.container, this.onDrag.bind(this));
    this.offsetX = 0;
    this.offsetY = 0;
    // Overshoot items
    this.items = [];
    this.setGrid(nCol,nRow);
    
    
    
  }
  onDrag(xDelta, yDelta){
    this.offsetX += xDelta;
    this.offsetY += yDelta;
    
    // Move the grid back by 1 item whenever it goes over 1/2 of an item
    // Making the movement invisible
    const itemWidth = 100./this.cols;
    const itemHeight = 100./this.rows;
    const pixelWidth = (itemWidth * window.innerWidth) / 100;
    const pixelHeight = (itemHeight * window.innerHeight) / 100;
    let jumpX = null;
    let jumpY = null;
    if(Math.abs(this.offsetX) > pixelWidth/2.){
      this.offsetX -= pixelWidth* Math.sign(this.offsetX);
      jumpX = Math.sign(this.offsetX);
    }
    if(Math.abs(this.offsetY) > pixelHeight/2.){
      this.offsetY -= pixelHeight * Math.sign(this.offsetY);
      jumpY = Math.sign(this.offsetY);
    }
    // console.log(this.rows, this.cols, jumpY)
    if(jumpX || jumpY){
      this.items.forEach(item => {
        if(jumpX) item.setIndex(this.shiftIndex(item.index + jumpX));
        if(jumpY) item.setIndex(this.shiftIndex(item.index + jumpY * (this.cols +2 )));
      })
    }
    
    this.grid.style.transform = `translate(${this.offsetX}px,${this.offsetY}px)`;
  }
  shiftIndex(index){
    if(index < 0 ){
      index = this.items.length + index;
    }
    index = index % this.items.length;
    
    return index;
  }
  
  setGrid(nCol = 2, nRow = 2) {            
    if(nCol === this.cols && nRow === this.rows) return;
    
    // Overshoot items
    const cols = nCol + 2;
    const rows = nRow + 2;
    // Add space for 2 more rows and columns using the current col/row size
    this.container.style.width = `${100 + 100/nCol*2.}vw`;
    this.container.style.height = `${100 + 100/nRow*2.}vh`;
     // Move the grid back by 1 col and row
    this.container.style.transform = `translate(${-100/nCol}vw, ${-100/nRow}vh)`
    
    // Do everything else taking into account the overshoot items
    this.grid.style.gridTemplateColumns = Array.from({length: cols}, ()=>'1fr').join(' ');
    this.grid.style.gridTemplateRows =  Array.from({length: rows}, ()=>'1fr').join(' ');
    
    const nItems =  cols * rows;
    this.cols = nCol;
    this.rows = nRow; 
    while(nItems < this.items.length){
    this.grid.removeChild(this.grid.children[this.items.length -1]);
      this.items = this.items.slice(0,this.items.length - 1);
    }
    while(nItems > this.items.length) {
        const item = new GridItem(this.items.length);
        this.items = this.items.concat(item);
        this.grid.append(item.item) 
    }
    
    this.items.forEach((item,index)=>{
      item.setIndex(index);
    })
    
  }
}

const grid = getColsAndRows();
const Infinite = new InfiniteGrid(grid.cols,grid.rows);

window.addEventListener('resize', ()=>{
const aspectRatio = window.innerWidth / window.innerHeight;
  
  const grid = getColsAndRows();
  Infinite.setGrid(grid.cols, grid.rows);
})

function getColsAndRows(){
  let cols = 3;
  let rows = 3;
  if(window.innerWidth > 800){
    cols = 4;
    rows = 4;
  }
  if(window.innerWidth < 500){
    rows = 1;
  }
  
const aspectRatio = window.innerWidth / window.innerHeight;
  
  cols +=  Math.max(0,Math.floor(aspectRatio) - 1);
  rows += Math.max(0, Math.floor(1. / (aspectRatio - 0.4)) -1)
  
  rows = Math.min(5, rows);
  cols = Math.min(8, cols);
  
  return {cols, rows};
}
              
            
!
999px

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