Javascript Course

Page sizes

If you want to get the total Height and Width of the page content in JavaScript, you can use this code:
// gets the total height of the page content
var page_height = document.body.offsetHeight ? document.body.offsetHeight : document.height;

// gets the total width of the page content
var page_width = document.body.offsetWidth ? document.body.offsetWidth : document.width;

// Test
alert('Height: '+ page_height +' px \nWidth: '+ page_width +' px');
- Example:

Window sizes

This function, getWindowSize(), can be used to get the Height and Width of the browser window, in pixels:
// Returns an Array with the 'height' and 'width' of the browser window, in pixels
function getWindowSize() {
 // from:
  var win_size = new Array;
  if (self.innerHeight) {
    win_size['height'] = self.innerHeight;
    win_size['width'] = self.innerWidth;
  } else if (document.documentElement && document.documentElement.clientHeight) {
    win_size['height'] = document.documentElement.clientHeight;
    win_size['width'] = document.documentElement.Width;
  } else if (document.body) {
    win_size['height'] = document.body.clientHeight;
    win_size['width'] = document.body.clientWidth;
  return win_size;

// Test: gets the array with the window sizes
var win_dim = getWindowSize();
alert('Height: '+ win_dim['height'] +' px \nWidth: '+ win_dim['width'] +' px');
- Example:

Daily Test with Code Example

Which HTML5 tag is indicated to be used as container for menu with navigation links in Web site?
<section> <nav> <article>
 <li><a href="" title="CSS Course">CSS Course</a></li>
 <li><a href="" title="Flash Games">Flash Games</a></li>
Which CSS property shifts an item horizontally to the left or right of where it was?
text-align clear float
.some_class {
  width: 30%;
  float: left;
Click on the Math object method which returns x, rounded downwards to the nearest integer.
Math.ceil(x) Math.abs(x) Math.floor(x)
var num = 12.34567;
num = Math.floor(num);
alert(num);       // 12
Indicate the PHP function which returns the number of characters in string.
mb_strlen() count() stristr()
$str = "string with utf-8 chars åèö";
$nrchr = mb_strlen($str);
echo $nrchr;        // 30
Get the Height and Width of web Page and browser Window

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