Input dialog question OK/Cancel Button

Hi there,
I�m busy with an application that displays an input dialog box on start up. It prompts the user for their name. This imput will then be used for a JLabel welcoming the user with their name. If no name is entered. The Jlabel will display �Welcone User�. Everythng works fine but when I press cancel on the input dialog box I get an error. Below is some code of what I�ve done so far.
Thanks,
Patrick.
String name = JOptionPane.showInputDialog(null,
          "Please enter your name",
          "Name input",
          JOptionPane.PLAIN_MESSAGE);
          welcome = new JLabel(name);
          if (name.length() == 0) {
               welcome = new JLabel("Welcome User");
          else if (name.length() > 0) {
               welcome = new JLabel("Welcome " + name);

The error is NullPointerException.
If the cancel button is pushed a null is returned.
Try this test instead
if ((name == null) || (name.length() == 0))
welcome = new JLabel("Welcome User");
}

Similar Messages

How do I create an input box with a cancel button that will end a loop in my script?

I have been working on a script for my client and I am having trouble getting it to work properly. I stole most of the code from the PowerShell Tip of the Week "Creating a Custom Input Box". I also took someone's code for the Show-MessageBox function.
I have slightly modified the original code with two parameters and an additional text box. The first field is for an e-mail address and the second is for an employee number.
I need to know how I can get a Do Until loop to recognize when the cancel button is pushed and break the loop and effectively end the script. The work happens at the end but perhaps I need something added/modified in the InputBox function.
I want the script to check to see if anything has been entered in the second text box. If empty it displays a message and calls the InputBox function again. Then if there is something I use elseif to check to see if it matches my RegEx (digits only). If
it doesn't match it will loop and call the InputBox function again.
This all works fine. The problem I am having is that I cannot cancel out of the form. I'd like the loop to continue until the second box matches my RegEx or Cancel is clicked. Clicking cancel doesn't break the loop. I need to know how I can stop the loop
when cancel is pressed. I've seen Stack "Overflow: PowerShell Cancel Button Stop Script" but I don't think this will work in a loop.
Any help would be awesome. As a note, I DO NOT want to use the VB Interaction stuff.
function InputBox {
param ($Name,$EN)
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
$objForm = New-Object System.Windows.Forms.Form
$objForm.Text = "Data Entry Form"
$objForm.Size = New-Object System.Drawing.Size(300,200)
$objForm.StartPosition = "CenterScreen"
$objForm.KeyPreview = $True
$objForm.Add_KeyDown({if ($_.KeyCode -eq "Enter")
{$x=$objTextBox.Text;$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"
$OKButton.Add_Click({$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 = "Employee Email Address:"
$objForm.Controls.Add($objLabel)
$objTextBox = New-Object System.Windows.Forms.TextBox
$objTextBox.Location = New-Object System.Drawing.Size(10,40)
$objTextBox.Size = New-Object System.Drawing.Size(260,20)
if ($Name) {
$objTextBox.Text = $Name
else {
$objTextBox.Text = "@domain.com"
$objLabel2 = New-Object System.Windows.Forms.Label
$objLabel2.Location = New-Object System.Drawing.Size(10,70)
$objLabel2.Size = New-Object System.Drawing.Size(280,20)
$objLabel2.Text = "Employee Number:"
$objForm.Controls.Add($objLabel2)
$objTextBox2 = New-Object System.Windows.Forms.TextBox
$objTextBox2.Location = New-Object System.Drawing.Size(10,90)
$objTextBox2.Size = New-Object System.Drawing.Size(260,20)
$objForm.Controls.Add($objTextBox)
$objForm.Controls.Add($objTextBox2)
$objForm.Topmost = $True
$objForm.Add_Shown({$objForm.Activate()})
[void] $objForm.ShowDialog()
$Script:ButtonName = $objTextBox.Text
$script:ButtonEN =$objTextBox2.Text
$ButtonName; $ButtonEN
Function Show-MessageBox{
Param(
[Parameter(Mandatory=$True)][Alias('M')][String]$Msg,
[Parameter(Mandatory=$False)][Alias('T')][String]$Title = "",
[Parameter(Mandatory=$False)][Alias('OC')][Switch]$OkCancel,
[Parameter(Mandatory=$False)][Alias('OCI')][Switch]$AbortRetryIgnore,
[Parameter(Mandatory=$False)][Alias('YNC')][Switch]$YesNoCancel,
[Parameter(Mandatory=$False)][Alias('YN')][Switch]$YesNo,
[Parameter(Mandatory=$False)][Alias('RC')][Switch]$RetryCancel,
[Parameter(Mandatory=$False)][Alias('C')][Switch]$Critical,
[Parameter(Mandatory=$False)][Alias('Q')][Switch]$Question,
[Parameter(Mandatory=$False)][Alias('W')][Switch]$Warning,
[Parameter(Mandatory=$False)][Alias('I')][Switch]$Informational)
#Set Message Box Style
IF($OkCancel){$Type = 1}
Elseif($AbortRetryIgnore){$Type = 2}
Elseif($YesNoCancel){$Type = 3}
Elseif($YesNo){$Type = 4}
Elseif($RetryCancel){$Type = 5}
Else{$Type = 0}
#Set Message box Icon
If($Critical){$Icon = 16}
ElseIf($Question){$Icon = 32}
Elseif($Warning){$Icon = 48}
Elseif($Informational){$Icon = 64}
Else{$Icon = 0}
#Loads the WinForm Assembly, Out-Null hides the message while loading.
[System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") | Out-Null
#Display the message with input
$Answer = [System.Windows.Forms.MessageBox]::Show($MSG , $TITLE, $Type, $Icon)
#Return Answer
Return $Answer
$num = "^\d+$"
do {
if (!($ButtonEN)) {
Show-MessageBox -Msg "You must enter a numeric value for the employee number." -Title "Employee Number Missing" -Critical
InputBox -Name $ButtonName
elseif ($ButtonEN -notmatch $num) {
Show-MessageBox -Msg "The employee number must contain numbers only!" -Title "Non-numerical characters found" -Critical
InputBox -Name $ButtonName
until ( ($ButtonEN -match $num) -or (<this is where I want to be able to use the cancel button>)

Here is a simple validation method.
function New-InputBox{
param(
$EmailAddress='',
$EmployeeNumber=''
Add-Type -AssemblyName System.Windows.Forms
$Form=New-Object System.Windows.Forms.Form
$Form.Text='Data Entry Form'
$Form.Size='300,200'
$Form.StartPosition='CenterScreen'
$OKButton=New-Object System.Windows.Forms.Button
$OKButton.Location='75,120'
$OKButton.Size='75,23'
$OKButton.Text='OK'
$OKButton.DialogResult='Ok'
$OKButton.CausesValidation=$true
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$CancelButton.Size = New-Object System.Drawing.Size(75,23)
$CancelButton.Text ='Cancel'
$CancelButton.DialogResult='Cancel'
$CancelButton.CausesValidation=$false
$Form.Controls.Add($CancelButton)
$Label1=New-Object System.Windows.Forms.Label
$Label1.Location='10,20'
$Label1.Size='280,20'
$Label1.Text='Employee Email Address:'
$Form.Controls.Add($Label1)
$TextBox1=New-Object System.Windows.Forms.TextBox
$TextBox1.Location='10,40'
$TextBox1.Size='260,20'
$textbox1.Name='EmailAddress'
$textbox1.Text=$EmailAddress
$Form.Controls.Add($textbox1)
$Label2=New-Object System.Windows.Forms.Label
$Label2.Location='10,70'
$Label2.Size='280,20'
$Label2.Text='Employee Number:'
$Form.Controls.Add($Label2)
$TextBox2=New-Object System.Windows.Forms.TextBox
$TextBox2.Location='10,90'
$TextBox2.Size='260,20'
$TextBox2.Name='EmployeeNumber'
$TextBox2.Text=$EmployeeNumber
$Form.Controls.Add($TextBox2)
$Form.AcceptButton=$OKButton
$Form.CancelButton=$CancelButton
$Form.Topmost = $True
$form1_FormClosing=[System.Windows.Forms.FormClosingEventHandler]{
if($Form.DialogResult -eq 'OK'){
if($textbox1.Text -eq ''){
[void][System.Windows.Forms.MessageBox]::Show('please enter an email address','Validation Error')
$_.Cancel=$true
}else{
# Check empno is all digits
if("$($TextBox2.Text)" -notmatch '^\d+$'){
[void][System.Windows.Forms.MessageBox]::Show('please enter a number "999999"','Validation Error')
$_.Cancel=$true
$form.add_FormClosing($form1_FormClosing)
$Form.Add_Shown({$Form.Activate()})
if($Form.ShowDialog() -eq 'Ok'){
# return the form contents
$Form
if($f=New-InputBox -EmailAddress [email protected]){
'Email is:{0} for Employee:{1}' -f $f.Controls['EmailAddress'].Text,$f.Controls['EmployeeNumber'].Text
}else{
Write-Host 'From cancelled!' -ForegroundColor red
¯\_(ツ)_/¯

Af:dialog model-restore / cancel-button processing best practice ?

Using JDev 11.1.1.3; if I have an af:dialog running in an af:popup which contains auto-submit components (for cross-component enablement, validation etc.). My question is what are the preferred ways of discarding the model submitted changes made through popup processing if/when the af:dialog cancel button is pressed by user ? Figured that using a task flow for the content that is the popup could be an option, and using the task flow savepoint restore feature, but that looks more like database restore than model restore. I want to be able to restore the model content to the way it looked before the popup executed, without necessitating a submit to the database. How is this most commonly and best achieved ?
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Also there are savepoints managed by the ADF Controller, but I could be of little help here because I have never used them. I suspect that this mechanism could be what you need, so you may have a look here for more details:
Adding Save Points to a Task Flow
and in this thread:
{thread:id=2128956}
Dimitar

In File Dialog, when click Cancel button, it prompts error and VI exits

Does anyone can give me an idea on how to solve this problem? When the user click on the Cancel button in the File Dialog box, it prompts out error and says "Operation canceled by user". How can I handle this error?
I got the same error when I click on the Cancel button when the system prompts me for replacing an existing file. Btw, how can I stop the system from prompting me to replace an existing file? Thankssss.....

Hi,
A similiar topic was discussed here
http://forums.ni.com/ni/board/message?board.id=170&message.id=151316#M151316
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Hi.,
I hope this url will help u..
http://docs.oracle.com/cd/E23549_01/apirefs.1111/e12419/tagdoc/af_inputDate.html
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parame

ADF Dialog Framework Cancel Button

Hi all,
We're experiencing, in multiple applications, a problem with a Cancel button (immediate="true") on a page launched by the dialog framework. While the value does not change in the model layer (saving to the database confirms this), it does seem to appear in the application UI, even after clicking the cancel button, until you post data.
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Message was edited by:
Avrom
[Further edit:] Wait, no, there's something even stranger going on here. Note that the text input in the dialog isn't bound to "#{bindings.SomeAttr.inputValue}"; it's bound to "#{processScope.editorValue}". And the cancel button doesn't even have a returnActionListener! So how is the value getting passed back to the original form?
Message was edited by:
Avrom

How to handle "ok" and "cancel" button of dialog popup?

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Thanks, with my regards.
Ali

You need dialogListener..
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Creating a dialog box with OK and Cancel buttons without OADialogPage

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Hi,
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The problem I have is I open the dialog box and push my button to call another script to run. But if there is an error the error is hid behind the dialog box. I would like to Call the dialog box, push button and then close my dialog box before the script runs. Can that be done.
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Go to Solution.

Hi J,
If you're willing to have the SUDialog close to unubstruct the view of a potential error dialog, then why not conditionally call the next script right after the SudDlgShow() command in the script that calls the SUDialog? If the user closes the dialog with the Cancel action, you don't run the script, but if they close with the Ok action, you do-- like this:
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Brad Turpin
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National Instruments

Today i made a gamecenter account and when i play a game like clash of clans it takes me to gamecenter and i log in then it takes me to a blank page with a cancel button so my question is how do i sign in to gamecenter when this happens

today i made a gamecenter account and when i play a game like clash of clans it takes me to gamecenter and i log in then it takes me to a blank page with a cancel button so my question is how do i sign in to gamecenter when this happens

Try:
FaceTime, Game Center, Messages: Troubleshooting sign in issues

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