powershell add action to combobox - powershell

Question

at the moment, i want to build a powershell gui. the form is running fine, so there are no problems. now i want to add an event for my selection, for example starting another script choosing "item1" and another script choosing "item2" and so on. how can i achieve that? thanfs for any help.
This is what i have actually.
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
$objForm = New-Object System.Windows.Forms.Form
$objForm.Text = "Combobox"
$objForm.Size = New-Object System.Drawing.Size(300,200)
$objForm.StartPosition = "CenterScreen"
$objForm.KeyPreview = $True
$objForm.Add_KeyDown({if ($_.KeyCode -eq "Enter")
{
foreach ($objItem in $objCombobox.SelectedItem)
{$x += $objItem}
$objForm.Close()
}
})
$objForm.Add_KeyDown({if ($_.KeyCode -eq "Escape")
{$objForm.Close()}})
$OKButton = New-Object System.Windows.Forms.Button
$OKButton.Location = New-Object System.Drawing.Size(75,120)
$OKButton.Size = New-Object System.Drawing.Size(75,23)
$OKButton.Text = "OK"
$OKButton.Add_Click(
{
foreach ($objItem in $objCombobox.SelectedItem)
{$x += $objItem}
$objForm.Close()
})
$objForm.Controls.Add($OKButton)
$CancelButton = New-Object System.Windows.Forms.Button
$CancelButton.Location = New-Object System.Drawing.Size(150,120)
$CancelButton.Size = New-Object System.Drawing.Size(75,23)
$CancelButton.Text = "Cancel"
$CancelButton.Add_Click({$objForm.Close()})
$objForm.Controls.Add($CancelButton)
$objLabel = New-Object System.Windows.Forms.Label
$objLabel.Location = New-Object System.Drawing.Size(10,20)
$objLabel.Size = New-Object System.Drawing.Size(280,20)
$objLabel.Text = "please choose"
$objForm.Controls.Add($objLabel)
$objCombobox = New-Object System.Windows.Forms.Combobox
$objCombobox.Location = New-Object System.Drawing.Size(10,40)
$objCombobox.Size = New-Object System.Drawing.Size(260,20)
[void] $objCombobox.Items.Add("Item 1")
[void] $objCombobox.Items.Add("Item 2")
[void] $objCombobox.Items.Add("Item 3")
[void] $objCombobox.Items.Add("Item 4")
[void] $objCombobox.Items.Add("Item 5")
$objCombobox.Height = 70
$objForm.Controls.Add($objCombobox)
$objForm.Topmost = $True
$objForm.Add_Shown({$objForm.Activate()})
[void] $objForm.ShowDialog()
$x

Answer 1

Continuing on my comment, below the revised script
$x = # the return variable which is updated in the OK Click event
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
$objForm = New-Object System.Windows.Forms.Form
$objForm.Text = "Combobox"
$objForm.Size = New-Object System.Drawing.Size(300,200)
$objForm.StartPosition = "CenterScreen"
$objForm.KeyPreview = $True
$OKButton = New-Object System.Windows.Forms.Button
$OKButton.Location = New-Object System.Drawing.Size(75,120)
$OKButton.Size = New-Object System.Drawing.Size(75,23)
$OKButton.Text = "OK"
$OKButton.DialogResult = [System.Windows.Forms.DialogResult]::OK
$OKButton.Add_Click({
$script:x = $objCombobox.SelectedItem # there is only one SelectedItem
$objForm.Close()
})
$objForm.Controls.Add($OKButton)
$CancelButton = New-Object System.Windows.Forms.Button
$CancelButton.Location = New-Object System.Drawing.Size(150,120)
$CancelButton.Size = New-Object System.Drawing.Size(75,23)
$CancelButton.Text = "Cancel"
$CancelButton.DialogResult = [System.Windows.Forms.DialogResult]::Cancel
$objForm.Controls.Add($CancelButton)
# using this, you do not need the Add_KeyDown events to react on clicking the OK or Cancel button
$objForm.AcceptButton = $OKButton
$objForm.CancelButton = $CancelButton
$objLabel = New-Object System.Windows.Forms.Label
$objLabel.Location = New-Object System.Drawing.Size(10,20)
$objLabel.Size = New-Object System.Drawing.Size(280,20)
$objLabel.Text = "please choose"
$objForm.Controls.Add($objLabel)
$objCombobox = New-Object System.Windows.Forms.Combobox
$objCombobox.Location = New-Object System.Drawing.Size(10,40)
$objCombobox.Size = New-Object System.Drawing.Size(260,20)
$objCombobox.Height = 70
[void] $objCombobox.Items.Add("Item 1")
[void] $objCombobox.Items.Add("Item 2")
[void] $objCombobox.Items.Add("Item 3")
[void] $objCombobox.Items.Add("Item 4")
[void] $objCombobox.Items.Add("Item 5")
$objCombobox.Add_SelectedIndexChanged({
# for demo, just write to console
Write-Host "You have selected '$($this.SelectedItem)'" -ForegroundColor Cyan
# inside here, you can refer to the $objCombobox as $this
switch ($this.SelectedItem) {
"Item 1" { <# do something when Item 1 is selected #> }
"Item 2" { <# do something when Item 2 is selected #> }
"Item 3" { <# do something when Item 3 is selected #> }
"Item 4" { <# do something when Item 4 is selected #> }
"Item 5" { <# do something when Item 5 is selected #> }
}
})
$objForm.Controls.Add($objCombobox)
$objForm.Topmost = $True
$objForm.Add_Shown({$objForm.Activate()})
[void] $objForm.ShowDialog()
# IMPORTANT clean up the form when done
$objForm.Dispose()
$x
As you can see, I have removed both $objForm.Add_KeyDown() event handlers, as they are not needed when you set $objForm.AcceptButton = $OKButton and $objForm.CancelButton = $CancelButton. Also, always remove the form from memory when done with it using $objForm.Dispose()
As per your comment, I understand you want to perform the selected action only after closing the form.
In that case also remove the $OKButton.Add_Click() event handler and just store the selected option in $script:x in the SelectedIndexChanged event:
$x = # the return variable which is updated in the SelectedIndexChanged event handler
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
$objForm = New-Object System.Windows.Forms.Form
$objForm.Text = "Combobox"
$objForm.Size = New-Object System.Drawing.Size(300,200)
$objForm.StartPosition = "CenterScreen"
$objForm.KeyPreview = $True
$objForm.Topmost = $True
$OKButton = New-Object System.Windows.Forms.Button
$OKButton.Location = New-Object System.Drawing.Size(75,120)
$OKButton.Size = New-Object System.Drawing.Size(75,23)
$OKButton.Text = "OK"
$OKButton.DialogResult = [System.Windows.Forms.DialogResult]::OK
$objForm.Controls.Add($OKButton)
$CancelButton = New-Object System.Windows.Forms.Button
$CancelButton.Location = New-Object System.Drawing.Size(150,120)
$CancelButton.Size = New-Object System.Drawing.Size(75,23)
$CancelButton.Text = "Cancel"
$CancelButton.DialogResult = [System.Windows.Forms.DialogResult]::Cancel
$objForm.Controls.Add($CancelButton)
# using this, you do not need the Add_KeyDown events to react on clicking the OK or Cancel button
$objForm.AcceptButton = $OKButton
$objForm.CancelButton = $CancelButton
$objLabel = New-Object System.Windows.Forms.Label
$objLabel.Location = New-Object System.Drawing.Size(10,20)
$objLabel.Size = New-Object System.Drawing.Size(280,20)
$objLabel.Text = "please choose"
$objForm.Controls.Add($objLabel)
$objCombobox = New-Object System.Windows.Forms.Combobox
$objCombobox.Location = New-Object System.Drawing.Size(10,40)
$objCombobox.Size = New-Object System.Drawing.Size(260,20)
$objCombobox.Height = 70
[void] $objCombobox.Items.Add("Item 1")
[void] $objCombobox.Items.Add("Item 2")
[void] $objCombobox.Items.Add("Item 3")
[void] $objCombobox.Items.Add("Item 4")
[void] $objCombobox.Items.Add("Item 5")
$objCombobox.Add_SelectedIndexChanged({
# inside here, you can refer to the $objCombobox as $this
# set the return variable to the SelectedItem
$script:x = $this.SelectedItem # there is only one SelectedItem
# or, if you want it to, you can start the action here immediately without leaving the form:
# switch ($this.SelectedItem) {
# "Item 1" { <# do something when Item 1 is selected #> }
# "Item 2" { <# do something when Item 2 is selected #> }
# "Item 3" { <# do something when Item 3 is selected #> }
# "Item 4" { <# do something when Item 4 is selected #> }
# "Item 5" { <# do something when Item 5 is selected #> }
# }
})
$objForm.Controls.Add($objCombobox)
$objForm.Add_Shown({$objForm.Activate()})
$dialogResult = $objForm.ShowDialog()
# IMPORTANT clean up the form when done
$objForm.Dispose()
if ($dialogResult -eq 'OK' -and ![string]::IsNullOrWhiteSpace($x)) {
# the form was not cancelled and a selection was made
# for demo, just write to console
Write-Host "You have selected '$($x)'" -ForegroundColor Cyan
switch ($x) {
"Item 1" { <# do something when Item 1 is selected #> }
"Item 2" { <# do something when Item 2 is selected #> }
"Item 3" { <# do something when Item 3 is selected #> }
"Item 4" { <# do something when Item 4 is selected #> }
"Item 5" { <# do something when Item 5 is selected #> }
}
}
else {
Write-Host "You have cancelled the dialog or did not select anything"
}
Ok, apparently now you want the form to stay after making a choice and clicking the OK button (and thus perform the chosen action).
In that case, you can simplify like this:
$x = #() # the return variable (an array with all selections made in order)
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName System.Drawing
$objForm = New-Object System.Windows.Forms.Form
$objForm.Text = "Combobox"
$objForm.Size = New-Object System.Drawing.Size(300,200)
$objForm.StartPosition = "CenterScreen"
$objForm.KeyPreview = $True
$objForm.Topmost = $True
$OKButton = New-Object System.Windows.Forms.Button
$OKButton.Location = New-Object System.Drawing.Size(75,120)
$OKButton.Size = New-Object System.Drawing.Size(75,23)
$OKButton.Text = "OK"
$OKButton.Add_Click({
$selected = $objCombobox.SelectedItem
$script:x += $objCombobox.SelectedItem
if (![string]::IsNullOrWhiteSpace($selected)) {
Write-Host "Performing action $($selected)" -ForegroundColor Yellow
$objLabel.Text = "Performing action $($selected)"
switch ($selected) {
"Item 1" { <# do something when Item 1 is selected #> }
"Item 2" { <# do something when Item 2 is selected #> }
"Item 3" { <# do something when Item 3 is selected #> }
"Item 4" { <# do something when Item 4 is selected #> }
"Item 5" { <# do something when Item 5 is selected #> }
}
$objLabel.Text = "Please choose"
$objCombobox.SelectedIndex = -1 # reset the combobox to blank
}
})
$objForm.Controls.Add($OKButton)
$CancelButton = New-Object System.Windows.Forms.Button
$CancelButton.Location = New-Object System.Drawing.Size(150,120)
$CancelButton.Size = New-Object System.Drawing.Size(75,23)
$CancelButton.Text = "Cancel"
$CancelButton.DialogResult = [System.Windows.Forms.DialogResult]::Cancel
$objForm.Controls.Add($CancelButton)
# using this, you do not need the Add_KeyDown events to react on clicking the OK or Cancel button
$objForm.AcceptButton = $OKButton
$objForm.CancelButton = $CancelButton
$objLabel = New-Object System.Windows.Forms.Label
$objLabel.Location = New-Object System.Drawing.Size(10,20)
$objLabel.Size = New-Object System.Drawing.Size(280,20)
$objLabel.Text = "please choose"
$objForm.Controls.Add($objLabel)
$objCombobox = New-Object System.Windows.Forms.Combobox
$objCombobox.Location = New-Object System.Drawing.Size(10,40)
$objCombobox.Size = New-Object System.Drawing.Size(260,20)
$objCombobox.Height = 70
[void] $objCombobox.Items.Add("Item 1")
[void] $objCombobox.Items.Add("Item 2")
[void] $objCombobox.Items.Add("Item 3")
[void] $objCombobox.Items.Add("Item 4")
[void] $objCombobox.Items.Add("Item 5")
$objForm.Controls.Add($objCombobox)
$objForm.Add_Shown({$objForm.Activate()})
$dialogResult = $objForm.ShowDialog()
# IMPORTANT clean up the form when done
$objForm.Dispose()
if ($dialogResult -ne 'Cancel' -or $x.Count -eq 0) {
# the form was cancelled or no selection was made
# for demo, just write to console
Write-Host "You have cancelled the dialog or did not select anything.."
}
else {
Write-Host "The selection(s) you made were $($x -join ', ')" -ForegroundColor Cyan
}