Javascript – File Upload Form Check When No File Selected

I was about to create a file upload form and want to check whether user has choose a file or not. I have tried using

if (typeof(variable) == 'undefined' || variable == null)


if (variable == null)

and many other way, just got luck when using

var filenames = $('#userfile')[0].files;
if (filenames.length > 0)


Excel VBA – ZIP Compress a file

I just got a need to compress a file through Excel VBA, here’s what I have found so far from Google.
You will need adding reference to Microsoft Scripting Runtime and Microsoft Shell Controls and Automation (by clicking menu Tools > Reference)

Option Explicit
Option Base 0

Private Declare Sub Sleep Lib “kernel32” (ByVal dwMiliseconds As Long)

Public Sub MakeZip(zipPath As String, filePath As String)
MakeEmptyZip zipPath
AddFile zipPath, filePath
End Sub

Private Sub AddFile(zipPath As String, filePath As String)
Dim sh As Shell32.Shell, fdr As Shell32.Folder, cntItems As Integer ‘cnt = Count
Set sh = CreateObject(“Shell.Application”)
Set fdr = sh.Namespace(zipPath)
cntItems = fdr.Items.Count
fdr.CopyHere filePath, 4 + 16 + 1024
Sleep 1000
Loop Until cntItems < fdr.Items.Count
Set fdr = Nothing
Set sh = Nothing
End Sub

Private Sub MakeEmptyZip(zipPath As String)
Dim fso As Scripting.FileSystemObject
Set fso = CreateObject(“Scripting.FileSystemObject”)
If fso.FileExists(zipPath) Then
fso.DeleteFile zipPath
End If
fso.CreateTextFile(zipPath).Write “PK” & Chr(5) & Chr(6) & String(18, Chr(0))
Set fso = Nothing
End Sub

Private Sub cmdCompress_Click()
Dim sourcePath As String
Dim zippedPath As String

Dim sourceBaseName As String
Dim zippedBaseName As String

Dim sourceFullPath As String
Dim zippedFullPath As String

sourcePath = “C:\Users\Remo\Downloads\”
zippedPath = “C:\Users\Remo\Downloads\”

sourceBaseName = “DATA.MDB”
zippedBaseName = “”

sourceFullPath = sourcePath + sourceBaseName
zippedFullPath = zippedPath + zippedBase

Call MakeZip(zippedFullPath, sourceFullPath)

MsgBox (“File ” + sourceBaseName + ” successfully compressed into ” + zippedBaseName)
End Sub


VirtualBox – Change Focus from Guest to Host and Vice Versa (Windows Host)

I use Windows 7 host with Ubuntu Server and Centos Minimal guest, sometimes when I move mouse cursor into virtualbox window it will disappear, even I’ve tried to move the mouse everywhere the cursor could not appear outside virtualbox window. I just found that pressing RIGHT CTRL key will bring the cursor back outside virtualbox window