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Having to click twice on a gui button for it to work. RRS feed

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    Hi,

    I have created a gui using xaml to work with my powershell script. It basically works as I want it to but I have to click on a button twice before it will output the expected result. The relevant snippet is:

    ##################

    function get-selecteddate { foreach ($v in $NewExpiry) {
                        if ($WPFlistView.SelectedItem.name -eq $v.name) {
                            $v.'New Expiry Date' = $WPFDateSelector.Selecteddate
                            $tempname = $v.name
                            $tempdate = $v.'New Expiry Date'.ToString("dd.MM.yyyy")
                            $WPFlistbox.AddChild("$tempname will be extended to $tempdate")
                            }
                        }
                        }

    $WPFSelectButton.Add_Click({get-selecteddate})

    ################

    This adds some text to a listbox successfully but only on the second time the button is clicked. I am very new to creating GUIs, so it may be something obvious.

    Thanks for any help!

    Thursday, January 11, 2018 10:54 AM

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    $WPFSelectButton_click = {
    foreach ($v in $NewExpiry) {
        if ($WPFlistView.SelectedItem.name -eq $v.name) {
            $v.'New Expiry Date' = $WPFDateSelector.Selecteddate
            $tempname = $v.name
            $tempdate = $v.'New Expiry Date'.ToString("dd.MM.yyyy")
            $WPFlistbox.AddChild("$tempname will be extended to $tempdate")
        }
    }
}

$WPFSelectButton.Add_Click($WPFSelectButton_click)

    \_(ツ)_/

    Thursday, January 11, 2018 1:30 PM
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    Hi,

    I've tried this and I'm still getting the same thing unfortunately :(

    I have noticed that it doesn't look like I do always have to click twice. Once I have selected a date on the date selector, the first click is not recognised and then the second and any subsequent clicks work.

    If I then select another date on the date selector, the next click is again not recognised.

    Thursday, January 11, 2018 3:55 PM
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    There is no way to guess at what your form is doing.  Somewhere your design or code are an issue.

    Add a trace into the event to show that the code is being called.

    Like this:

    $WPFSelectButton_click = {
    Write-Host 'Button clicked'
    foreach ($v in $NewExpiry) {
        if ($WPFlistView.SelectedItem.name -eq $v.name) {
            $v.'New Expiry Date' = $WPFDateSelector.Selecteddate
            $tempname = $v.name
            $tempdate = $v.'New Expiry Date'.ToString("dd.MM.yyyy")
            $WPFlistbox.AddChild("$tempname will be extended to $tempdate")
        }
    }
}

$WPFSelectButton.Add_Click($WPFSelectButton_click)

    \_(ツ)_/

    Thursday, January 11, 2018 4:05 PM
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    Hi Jrv,

    I had thought to try that. I get the same behaviour: it writes to host on the second and subsequent clicks.

    Thursday, January 11, 2018 4:35 PM
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    I have managed to bypass this issue by getting rid of the select button in the end, and just using the date selector:

    function get-selecteddate { foreach ($v in $NewExpiry) {
                        if ($WPFlistView.SelectedItem.name -eq $v.name) {
                            $v.'New Expiry Date' = $WPFDateSelector.Selecteddate
                            $tempname = $v.name
                            $tempdate = $v.'New Expiry Date'.ToString("dd.MM.yyyy")
                            $dateout = "$tempname will be extended to $tempdate"
                            write-host $dateout
                            $WPFlistbox.AddChild($dateout)
                            $WPFListView.ClearValue()
                            }
                        }
                        }
    $WPFDateSelector.Add_SelectedDatesChanged({get-selecteddate})

    And this works first time when the date is selected.

    I would be interested to find out why it was behaving in this way though.

    Thursday, January 11, 2018 4:40 PM
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    Then something is wrong with your form design or the WPF framework.

    \_(ツ)_/

    Thursday, January 11, 2018 4:40 PM
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    Here is a simple form that tests the WPF and button click:

    Add-Type -AssemblyName presentationframework
    
[xml]$xaml = @'
<Window 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Get All Permissions" Height="200" Width="250"
        WindowStartupLocation="CenterScreen">
    <Grid>
        <Button 
            x:Name="startBtn" Content="Start" 
            HorizontalAlignment="Left" VerticalAlignment="Top"
            Margin="20,20,20,20"
            Width="204" Height="46" FontWeight="Bold" FontSize="22" 
            Background="#FF17EA17" 
            Focusable="False"/>
    </Grid>
</Window>
'@

$rdr = New-Object System.Xml.XmlNodeReader($xaml)
$form = [Windows.Markup.XamlReader]::Load($rdr)

$startBtn = $form.findname('startBtn')
$startBtn.Add_Click({
        #$this.Parent.Parent.Close()
        Write-Host 'Button clicked!'
})
$form.showDialog()


    If it works then you have junk in your code.

    \_(ツ)_/


    Thursday, January 11, 2018 4:57 PM