How to change URL without refreshing?

You can change the URL without refreshing  with  location.hash  .

For ex: facebook and twitter use this method.

http://twitter.com/#!/username

Browsers use the # symbol as page anchors and you create your own prefix to catch the URL like #!
You can  listen to URL with  window.onhaschange  to send a XHTTP request when it changes.

Example:

<script type="text/javascript"> 

window.onhashchange = function() {

    var link = location.hash.replace('#!','');

// add  your XHTTP request code here

    alert('URL changed. Your link is "'+ link +'"');

}

</script>

<a href="#!/en/home/">change url</a>

If you wish to check browsers' onhaschange capability, you can use the code below:

<script type="text/javascript">
if ("onhashchange" in window) { alert('location hash is enable!'); } 

</script> 

How to round numbers in JavaScript?

You can use Math Object or Bitwise Operator for round a number:

round(a) - Returns the value of a to the nearest integer. If the values decimal value is .5 or greater the next highest integer value is returned otherwise the next lowest integer is returned.


floor(a) - Rounds the passed value down to the previous integer. If the passed value is already an integer the returned value is the same as the passed value.


ceil(x) - Rounds up the value of "a" to the next integer. If the value is a already whole number, the return value will be the same as the passed value.

<script type="text/javascript">
var original=28.453;
//round "original" to the nearest integer
var result = Math.round(original);  //returns 28

//other way

var result = original >> 0;  //returns 28

//round "original" to  down to the previous integer

var result = Math.floor(original);  //returns 28

//round "original" to  up to the next integer

var result = Math.ceil(original);  //returns 29

//round "original" to two decimals
var result = Math.round(original*100)/100;  //returns 28.45
// other way
var result = (original *100 >> 0) *0.01;  //returns 28.45
</script>

How to HTML5 tags working in IE8?

You can get HTML5 tags working in IE8 by including this JavaScript in the head.

<script type="text/javascript">
 document.createElement('header');
 document.createElement('hgroup');
 document.createElement('nav');
 document.createElement('menu');
 document.createElement('section');
 document.createElement('article');
 document.createElement('aside');
 document.createElement('footer');
</script>