February 27, 2012
How to Round Floating Number in Javascript

Rounding a floating number is easy as pie. There are many ways to do that. Let’s see the example.

Using .toFixed

// toFixed(3) 
var num = 58.8963;
var result = num.toFixed(3); // result equal to 58.896

// toFixed(2) when the number has no decimal places
num = 70;
result = num.toFixed(3); // result equal to 70.000

Error in Floating Point :

num = 162.295
num *= 100 // 16229.499999999998
num = Math.round(num) // 16229
num /= 100 // 162.29

As we see at second point, num will return exact value. So beware to use it for calculation.

(Source: http)

9:43pm  |   URL: http://tmblr.co/Z4M89yH9ihvX
(View comments) 
Filed under: javascript tips programming web development 
January 26, 2012
Mengambil Nilai dari URI Parameter

Sekedar ingin berbagi tips, bagaimana cara mengambil sebuah nilai / value yang sebelumnya di parsing pada URI parameter. Misalkan  dalam sebuah URI : http://localhost/myapp?id=88&param1=robee , nah, kita mau mengambil variable param1 yang berisi nilai robee tersebut untuk diolah lagi.

Buat function :

   
var QueryString = function () {
	  var query_string = {};
	  var query = window.location.search.substring(1);
	  var vars = query.split("&");
	  for (var i=0;i<vars.length;i++) {
	    var pair = vars[i].split("=");
	    if (typeof query_string[pair[0]] === "undefined") {
	      query_string[pair[0]] = pair[1];
	    } else if (typeof query_string[pair[0]] === "string") {
	      var arr = [ query_string[pair[0]], pair[1] ];
	      query_string[pair[0]] = arr;
	    } else {
	      query_string[pair[0]].push(pair[1]);
	    }
	  } 
	    return query_string;
	} ();

Untuk Menggunakannya :

   
nama= QueryString.param1;

10:19pm  |   URL: http://tmblr.co/Z4M89yFR2pt_
(View comments) 
(Notes: 23)
  
Filed under: javascript coding programming web development 
Liked posts on Tumblr: More liked posts »