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() {
  // http://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 tag adds a new line into a paragraph?
<b> <br> <p>
First line ...<br>
Other line...
Which CSS property can be used to add space between letters?
text-size word-spacing letter-spacing
#id {
  letter-spacing: 2px;
}
What JavaScript function can be used to get access to HTML element with a specified ID?
getElementById() getElementsByTagName() createElement()
var elm = document.getElementById("theID");
var content = elm.innerHTML;
alert(content);
Click on the "echo" correct instruction.
echo "CoursesWeb.net" echo "CoursesWeb.net"; echo ""CoursesWeb.net";
echo "Address URL: http://CoursesWeb.net";
Detect when ScrollBar reaches the bottom of the page

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