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var count = 0;

$("body").on({
    click:function(){
       $(this).after("<p>Another paragraph! "+(++count)+"</p>");
    }
}, "p");

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// author http://stackoverflow.com/users/112407/rune-fs
$("div.id_100 option:selected").prop("selected",false);
$("div.id_100 option[value=" + value + "]").prop("selected",true);

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<?php
class Eksport extends CI_Controller {

  function export() {
    $file_name = "Nama file.xls";
    header("Content-type: application/vnd.ms-excel");
    header("Content-Disposition: attachment; filename={$file_name}");
    header("Expires: 0");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    $data = array(

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#Install dependencies

sudo apt-get update
sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev python-software-properties libffi-dev

#Install Ruby with rbenv

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Install Rails 4.2

Before install Rails 4.2, we need to install node.js first

sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get install nodejs

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Git Commands cheatsheet

Basic

Undoing Changes

Inisialisasi Git

$ git init

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Enable or disable device on ubuntu 14.04

type xinput and see the device id

$ xinput

To disable device, type this line

$ xinput --disable xx xx adalah id device

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//to safely serialize
$safe_string_to_store = base64_encode(serialize($multidimensional_array));

//to unserialize...
$array_restored_from_db = unserialize(base64_decode($encoded_serialized_string));

// to update serialized data
$data = unserialize($serializedData);
if(array_key_exists('key', $data) {
    $data['key'] = 'New Value';

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Add new row to the last row of table

$('#myTable tr:last').after('<tr>...</tr><tr>...</tr>');

Remove current row of the table

$(this).closest('tr').remove();

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Type in one input field and show in other input field realtime. Also replace non alpha numeric with empty space and replace space with underscore.

$('body').on('keyup', '.input-label', function(event) {
     var me = $(this);
     var valOfme = me.val();   
     valOfme = valOfme.replace(/[^a-zA-Z 0-9]+/g,'').replace(/\s+/g,'_');
     me.closest('tr').find('input.input-field').val(valOfme);   
});