Javascript Course

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 tag is used in <table> to create table header cell?
<thead> <th> <td>
<table><tr>
  <th>Title 1</th>
  <th>Title 2</th>
</tr></table>
Which CSS property sets the distance between lines?
line-height word-spacing margin
.some_class {
  line-height: 150%;
}
Which function opens a new browser window.
alert() confirm() open()
document.getElementById("id_button").onclick = function(){
  window.open("http://coursesweb.net/");
}
Indicate the PHP function that returns an array with names of the files and folders inside a directory.
mkdir() scandir() readdir()
$ar_dir = scandir("dir_name");
var_export($ar_dir);
Detect when ScrollBar reaches the bottom of the page

Last accessed pages

  1. Get and change IFrame content through a JavaScript script created in another IFrame (16553)
  2. Shape Tween - Flash Animation (6185)
  3. CSS Border (6122)
  4. Disable button and Enable it after specified time (17587)
  5. Follow the mouse cursor with a DIV inside a Parent (8391)

Popular pages this month

  1. Courses Web: PHP-MySQL JavaScript Node.js Ajax HTML CSS (524)
  2. CSS cursor property - Custom Cursors (70)
  3. The Mastery of Love (50)
  4. PHP-MySQL free course, online tutorials PHP MySQL code (48)
  5. Read Excel file data in PHP - PhpExcelReader (46)