Wen's Blog 谢文雄: 2013

Thursday, November 21, 2013

Free memory used by kernel in linux

Check your current memory free
> free

Run this command
> free && sync && echo 3 > /proc/sys/vm/drop_caches && free

Check again
> free

Tuesday, October 29, 2013

Removing url/index.php/... when using CodeIgniter

When creating application using CodeIgniter by default the URL will be as follow:

http://www.mydomain.com/index.php/home

When you want to shown as

http://www.mydomain.com/home

Solution

Put a file .htaccess in your root application folder

The file .htaccess content is

RewriteEngine on
RewriteCond $1 !^(index\.php|images|css|js|robots\.txt)
RewriteRule ^(.*)$ /your-root-folder/index.php/$1 [L]

Thursday, October 24, 2013

Butuh jawaban ?

Butuh Jawaban ?

Tanyakan disini

http://tanyajawab.evo-training.com

Untuk request penambahan kategori, bisa melakukan request via email di boylevantz@gmail.com

Tuesday, September 24, 2013

Lowongan Magang Web Developer

Di buka lowongan untuk posisi magang
Web Programmer

- Dibutuhkan 2 orang
- Skill requirement basic: HTML,javascript,jquery,PHP, MySQL
- No Experience needed
- Akan diberikan training tambahan sebelum kerja
- Dikontrak untuk 1 bulan dengan possibility untuk diperpanjang.
- Kantor di Business Park Kebon jeruk A18
- Bila selesai kontrak akan diberikan surat rekomendasi staff magang dengan cap perusahaan.
- Jam kerja 20 atau 40 jam/minggu

Bagi yang berminat silahkan hubungi via email di
ali@evo-training.com
dengan judul email "Magang Web Programmer"

Thursday, July 18, 2013

Worklight Demo Application

Here is simple application build using IBM Worklight

Preparations:
- Install Eclipse Juno with Worklight

For full source code download here:

Worklight project - project for mobile client side, using IBM Worklight Studio
Server side code - server side code in PHP and MySQL

The application will demo how to:
- Use worklight in offline mode, does not contact Worklight Server
- Call external server side, cross domain (I'm using PHP and MySQL for example)
- Using jQueryMobile
- Using Google Map Javascript API

Code review

get_list.php

<?php header("Access-Control-Allow-Origin: *"); header("Content-type: application/json"); $result = array(); $con = mysql_connect("localhost","root",""); mysql_select_db("demo"); $sql = "select * from contacts"; $rs = mysql_query($sql); while($read = mysql_fetch_array($rs)){ $result[] = array("id"=>$read[0], "name"=>$read[1], "phone"=>$read[2]); } mysql_close($con); echo json_encode($result);?>

In client side application can use jQuery mobile with Worklight

<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<title>DemoApp</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=0">
<link rel="shortcut icon" href="images/favicon.png">
<link rel="apple-touch-icon" href="images/apple-touch-icon.png">
<link rel="stylesheet" href="css/DemoApp.css">
<link rel="stylesheet" href="jqueryMobile/jquery.mobile-1.3.1.min.css">
<link rel="stylesheet" href="jqueryMobile/jquery.mobile.theme-1.3.1.min.css">
<script>window.$ = window.jQuery = WLJQ;</script>
</head>
<body id="content">
<div id="home" data-role="page">
<div data-role="header">
<a href="#add_contact" data-role="button" id="addContact" data-theme="b">Add Contact</a> <h2>Demo App</h2>
<a href="#view_map" data-role="button" id="viewMap" data-theme="b">View Map</a>
</div>
<div data-role="content">
<div id="message"></div>
<ul id="contact_list" data-role="listview">
</ul>
</div>
</div>
<div id="add_contact" data-role="page">
<div data-role="header">
<a href="#" data-role="button" data-rel="back" data-theme="b">Back</a>
<h2>Demo App</h2>
</div>
<div data-role="content">
<div>
<input type="text" id="txtName" placeholder="Your name" />
</div>
<div>
<input type="text" id="txtPhone" placeholder="Your phone" />
</div>
<div>
<input type="button" id="btnSave" value="Save" data-theme="b" />
</div>
</div>
</div>
<div id="view_map" data-role="page">
<div data-role="header">
<a href="#" data-role="button" data-rel="back">Back</a>
<h2>Demo App</h2>
</div>
<div data-role="content">
<div id="canvas"></div>
</div>
</div>
<script src="js/initOptions.js"></script>
<script src="js/DemoApp.js"></script>
<script src="js/messages.js"></script>
<script src="jqueryMobile/jquery.mobile-1.3.1.min.js"></script>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
</body>
</html>

On javascript side

$(document).ready(function(){
$('#addContact').click(function(){
$('#txtName').val('');
$('#txtPhone').val('');
$.mobile.changePage('#add_contact');
});
$('#viewMap').click(function(){

$.mobile.changePage('#view_map');
loadMap();

});
$('#btnSave').click(function(){
var name = $('#txtName').val();
var phone = $('#txtPhone').val();
if(name.trim()==''){
alert('Name is required');
$('#txtName').focus();
return;
}
if(phone.trim()==''){
alert('Phone is required');
$('#txtPhone').focus();
return;
}
addContact(name, phone);
});

loadContactList();

});

For full source code download here:

Worklight project - project for mobile client side, using IBM Worklight Studio
Server side code - server side code in PHP and MySQL

Tuesday, February 26, 2013

Create beautiful random color with Javascript

<html>
<head>
</head>
<body>

<div id="content" />

<script>

var golden_ratio = 0.618033988749895;

function hsv_to_rgb(h, s, v){
var r,g,b,p,q,v;
var hi = (h*6);
var f = h*6 - hi;
p = v * (1 - s);
q = v * (1 - f*s);
t = v * (1 - (1-f) * s);
hi = parseInt(hi,10);

if(hi==0) { r=v; g=t; b=p; }
if(hi==1) { r=q; g=v; b=p; }
if(hi==2) { r=p; g=v; b=t; }
if(hi==3) { r=p; g=q; b=v; }
if(hi==4) { r=t; g=p; b=v; }
if(hi==5) { r=v; g=p; b=q; }
return { r : parseInt(r*256,10), g : parseInt(g*256,10), b: parseInt(b*256,10) }
}

var html = '';

var rnd = Math.random();
var rnds = 0.5;
var rndv = 0.95;

for(var i=0;i<6;i++){
rnd += golden_ratio;
rnd %= 1;

var color = hsv_to_rgb(rnd, rnds, rndv);
var hexString = '#'+color.r.toString(16)+color.g.toString(16)+color.b.toString(16);
html += '<div style="width:50px;height:50px;background-color: '+hexString+'"> </div><br/>';
}

rnds = 0.25;
rndv = 0.8;
for(var i=0;i<6;i++){
console.log('*');
rnd += golden_ratio;
rnd %= 1;

var color = hsv_to_rgb(rnd, rnds, rndv);
var hexString = '#'+color.r.toString(16)+color.g.toString(16)+color.b.toString(16);
html += '<div style="width:50px;height:50px;background-color: '+hexString+'"> </div><br/>';
}

rnds = 0.3;
rndv = 0.99;
for(var i=0;i<6;i++){
console.log('*');
rnd += golden_ratio;
rnd %= 1;

var color = hsv_to_rgb(rnd, rnds, rndv);
var hexString = '#'+color.r.toString(16)+color.g.toString(16)+color.b.toString(16);
html += '<div style="width:50px;height:50px;background-color: '+hexString+'"> </div><br/>';
}

//console.log(html);
document.getElementById('content').innerHTML = html;
</script>

</body>

</html>

Saturday, January 12, 2013

Convert binary to decimal

Convert

Convert binary to decimal.
Input 101, will be output as 5

#include <stdio.h>
#include <string.h>
#include <math.h>

int main()
{
long int y, num, sum,k;
char x[8];

// Harusnya input terlebih dahulu, jgn strlen dulu
scanf("%s",x); fflush(stdin);

sum = 0;
k=strlen(x);

for (y=0; y<k; y++)
{
num=x[y]-'0';
sum=sum + powl(2,num);
}

printf("%d", sum);

getchar();

return 0;
}

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