/Javascript/jQuery/Jquery fixed element on scroll footer

Jquery fixed element on scroll footer

var socialFloat = document.querySelector('#social-float');
var footer = document.querySelector('#footer');

function checkOffset() {
  function getRectTop(el){
    var rect = el.getBoundingClientRect();
    return rect.top;
  }
  
  if((getRectTop(socialFloat) + document.body.scrollTop) + socialFloat.offsetHeight >= (getRectTop(footer) + document.body.scrollTop) - 10)
    socialFloat.style.position = 'absolute';
  if(document.body.scrollTop + window.innerHeight < (getRectTop(footer) + document.body.scrollTop))
    socialFloat.style.position = 'fixed'; // restore when you scroll up
  
  socialFloat.innerHTML = document.body.scrollTop + window.innerHeight;
}

document.addEventListener("scroll", function(){
  checkOffset();
});

Source: stackoverflow.com

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