Create floating button that accompanies a table scroll

Question

I need to create a floating button that accompanies my scroll as I go along, and I want to put a function back on top.

#voltarAoTopo {
  float:right;
  z-index:0;
}

<button id="voltarAoTopo">
    <i class="material-icons">contacts</i>
</button>   

Answer 1

Just create a fixed button in the bottom right corner, and put a Javascript function to return to the top. The button will only appear after 20 pixels of scroll (this you can adjust as you want):

window.onscroll = function() {scrollFunction()};

function scrollFunction() {
    if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
        document.getElementById("myBtn").style.display = "block";
    } else {
        document.getElementById("myBtn").style.display = "none";
    }
}

function topFunction() {
    document.body.scrollTop = 0;
    document.documentElement.scrollTop = 0;
}

p{
display: block; height: 2500px;}

#myBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 9999;
  border: none;
  outline: none;
  background-color: red;
  color: white;
  cursor: pointer;
  padding: 15px;
  border-radius: 10px;
}

#myBtn:hover {
  background-color: #555;
}

<p>Role para baixo</p>
<button onclick="topFunction()" id="myBtn" title="Ir ao topo">Topo</button>

Bonus: Animation using pure JS

Code credit at this link.

window.onscroll = function() {scrollFunction()};

window.requestAnimFrame = (function(){
  return  window.requestAnimationFrame       ||
          window.webkitRequestAnimationFrame ||
          window.mozRequestAnimationFrame    ||
          function( callback ){
            window.setTimeout(callback, 1000 / 60);
          };
})();

function scrollToY(scrollTargetY, speed, easing) {
    // scrollTargetY: the target scrollY property of the window
    // speed: time in pixels per second
    // easing: easing equation to use

    var scrollY = window.scrollY || document.documentElement.scrollTop,
        scrollTargetY = scrollTargetY || 0,
        speed = speed || 2000,
        easing = easing || 'easeOutSine',
        currentTime = 0;

    // min time .1, max time .8 seconds
    var time = Math.max(.1, Math.min(Math.abs(scrollY - scrollTargetY) / speed, .8));

    // easing equations from https://github.com/danro/easing-js/blob/master/easing.js
    var easingEquations = {
            easeOutSine: function (pos) {
                return Math.sin(pos * (Math.PI / 2));
            },
            easeInOutSine: function (pos) {
                return (-0.5 * (Math.cos(Math.PI * pos) - 1));
            },
            easeInOutQuint: function (pos) {
                if ((pos /= 0.5) < 1) {
                    return 0.5 * Math.pow(pos, 5);
                }
                return 0.5 * (Math.pow((pos - 2), 5) + 2);
            }
        };

    // add animation loop
    function tick() {
        currentTime += 1 / 60;

        var p = currentTime / time;
        var t = easingEquations[easing](p);

        if (p < 1) {
            requestAnimFrame(tick);

            window.scrollTo(0, scrollY + ((scrollTargetY - scrollY) * t));
        } else {
            window.scrollTo(0, scrollTargetY);
        }
    }

    // call it once to get started
    tick();
}

function scrollFunction() {
    if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
        document.getElementById("myBtn").style.display = "block";
    } else {
        document.getElementById("myBtn").style.display = "none";
    }
}

p{
display: block; height: 2500px;}

#myBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 9999;
  border: none;
  outline: none;
  background-color: red;
  color: white;
  cursor: pointer;
  padding: 15px;
  border-radius: 10px;
}

#myBtn:hover {
  background-color: #555;
}

<p>Role para baixo</p>
<button onclick="scrollToY(0, 10000, 'easeInOutSine');" id="myBtn" title="Ir ao topo">Topo</button>

Answer 2

#voltarAoTopo {
  float:right;
  z-index:0;
  position:fixed;
  bottom:20px;
  right:15px;
}

And in that detail window, put z-index:9;

You tried so?

Answer 3

Hello,

Set the z-index: considering 9 as above all, and 0 below all.

So,

z-index:0

or

  z-index:1

Answer 4

Use position: relative in the parent element of everything. In the table have a div that has overflow enabled. And out of this div put a button with position: Absolute.

This thumb drive can help you.