Javascript Course

Here is a simple JavaScript function that can be used to move a html element to a random direction in page.

click on the code to select it.
//sets a random absolute position to a html element; receives the html element
function moveElmRand(elm){
 elm.style.position ='absolute';
 elm.style.top = Math.floor(Math.random()*90+5)+'%';
 elm.style.left = Math.floor(Math.random()*90+5)+'%';
}

Funny example with auto-moving a button

- In the following example the moveElmRand() function is called when the mouse is over the button.
<h4>Example auto-moving html element</h4>
<p>Try to click on the following button.</p>

<button id='btn_test'>Catch Me</button>
<script>
//sets a random absolute position to a html element; receives the html element
function moveElmRand(elm){
 elm.style.position ='absolute';
 elm.style.top = Math.floor(Math.random()*90+5)+'%';
 elm.style.left = Math.floor(Math.random()*90+5)+'%';
}

//get the #btn_test
var btn_test = document.querySelector('#btn_test');

//register to call moveElmRand() on mouseenter event to #btn_test
btn_test.addEventListener('mouseenter', function(e){ moveElmRand(e.target);});

//register click to #btn_test
btn_test.addEventListener('click', function(e){ alert('You are Good.');});
</script>

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which HTML5 tag can be used to embed an external application (SWF, PDF) in web page?
<mark> <embed> <canvas>
<embed src="flash_game.swf" width="450" height="350" />
Which CSS pseudo-element adds a special style to the first line of a text?
:first-letter :before :first-line
#id:first-line {
  font-weight: bold;
  color: blue;
}
Click on the window object property which gets or sets the URL of current page.
window.location window.self window.status
var url = window.location;
alert(url);
Indicate the PHP function used to get the contents of a file or page and store it into a string.
fopen() file_put_contents() file_get_contents()
$homepage = file_get_contents("http://coursesweb.net/");
echo $homepage;
Moving html element to a random direction

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