The JavaScript function presented in this page can be used to Detect when ScrollBar reaches the bottom of the page.
This function is useful when you want to execute some JavaScript code when the user scrolls till the bottom of page, for example to display another content, making an infinite scroll.
Here is the function, named whenScrlBottom(). It must be accessed by the "onscroll" event. 
// function to detect when scroollbar reaches the bottom of page
var whenScrlBottom = function() {
  // https://coursesweb.net/javascript/
  var win_h = (self.innerHeight) ? self.innerHeight : document.body.clientHeight;    // gets window height

  // gets current vertical scrollbar position
  var scrl_pos = window.pageYOffset ? window.pageYOffset : document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop;

  // if scrollbar reaces to bottom
  if (document.body.scrollHeight <= (scrl_pos + win_h)) {
    alert('Bottom');
  }
}

// register event on scrollbar
window.onscroll = whenScrlBottom;

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which HTML5 tag defines marked text? (can be used to highlight parts of text)
<mark> <embed> <span>
<p>Free corses: <mark>coursesweb.net</mark> for Web Development.</p>
Which CSS pseudo-class adds a style to an element when the mouse is over it?
:focus :hover :active
a:hover {
  font-weight: bold;
  color: #00da01;
}
Click on the function which returns a string value that represents the number rounded to the x digits after the decimal point.
toPrecision(x) toFixed(x) floor(x)
var num = 12.34567;
num = num.toFixed(2);
alert(num);       // 12.35
Indicate the PHP function which reads an entire file into an array.
[) file() readfile()
$arr = file("a_file.txt", FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
var_export($arr);
Detect when ScrollBar reaches the bottom of the page

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