New-UDTableColumn Render Parameter Issues

PowerShell Universal
1

I’m attempting to create a table of Windows services and their states (Running or stopped) with a custom button on each row using the -Render parameter of New-UDTableColumn. The button will say either Start or Stop based on the state of the service and clicking a button will either start or stop the associated service.

I’m getting the error Cannot bind argument to parameter 'InputObject' because it is null. and I’ve determined that it’s because the $Body variable is null.

I referenced the following resources when putting my code together:

  • PowerShell Universal documentation
  • New-UDTableColumn cmdlet documentation
    Note: The cmdlet help for New-UDTableColumn states the following for the Render parameter:
    How to render this table. Use this parameter instead of property to render custom content within a column. The $Body variable will contain the current row being rendered. – I tried removing the Property parameter, but I get an error stating that it is required.
  • Forum post New-UDTable Column render

Below is the code I’m using. Is there anything in particular I’m doing wrong?

$srvrHostname = "Server1"
$WinServices = Get-WmiObject -ComputerName $srvrHostname -Class "win32_service" | Select-Object -First 10
$Theme = @{
    light = @{
        palette = @{
            primary = @{
                main = '#9e9e9e'
            }
        }
    }
}
New-UDDashboard -Title "$srvrHostname Windows Services Status - TestEnv" -Theme $Theme -DefaultTheme 'Light' -Content {
    $Header = New-UDCardHeader -Title "$srvrHostname Windows Services Status"
    $Body = New-UDCardBody -Content {
        $Data = $WinServices
        $Columns = @(
            New-UDTableColumn -Property Name -Title "Name"
            New-UDTableColumn -Property State -Title "State"
            New-UDTableColumn -Property Started -Title "Start/Stop" -Render {
                $Item = $Body | ConvertFrom-Json
                if ($Item.Started -eq $true) {
                    New-UDButton  -Id "bloopers" -Text "Stop" -OnClick {
                        Show-UDToast -Message 'Starting Service...' -Duration 5000
                    }
                } else {
                    New-UDButton -Variant text -Text 'Start' -OnClick {
                        Show-UDToast -Message 'Starting Service...' -Duration 5000
                    }
                }
            }
        )
        New-UDTable -Data $Data -Columns $Columns -Dense
    }
    New-UDCard -Body $Body -Header $Header
}

Product: PowerShell Universal
Version: 2.12.5
2

Not sure about the core issue… But try this.

$Item = $Eventdata.Started
3

Hey @adam,

Jori’s solution worked although I had to set $Item = $Eventdata. I’m concerned that this means the PSU and New-UDTableColumn documentation are incorrect with regard to using the Render parameter.

@Jori, thank you for the assistance!

For the sake of posterity, the full, functional script is below:

$srvrHostname = "Server1"
$WinServices = Get-WmiObject -ComputerName $srvrHostname -Class "win32_service" | Select-Object -First 10
$Theme = @{
    light = @{
        palette = @{
            primary = @{
                main = '#9e9e9e'
            }
        }
    }
}
New-UDDashboard -Title "$srvrHostname Windows Services Status - TestEnv" -Theme $Theme -DefaultTheme 'Light' -Content {
    $Header = New-UDCardHeader -Title "$srvrHostname Windows Services Status"
    $Body = New-UDCardBody -Content {
        $Data = $WinServices
        $Columns = @(
            New-UDTableColumn -Property Name -Title "Name"
            New-UDTableColumn -Property State -Title "State"
            New-UDTableColumn -Property Started -Title "Start/Stop" -Render {
                $Item = $Eventdata
                if ($Item.Started -eq $true) {
                    New-UDButton  -Id "bloopers" -Text "Stop" -OnClick {
                        Show-UDToast -Message 'Starting Service...' -Duration 5000
                    }
                } else {
                    New-UDButton -Variant text -Text 'Start' -OnClick {
                        Show-UDToast -Message 'Starting Service...' -Duration 5000
                    }
                }
            }
        )
        New-UDTable -Data $Data -Columns $Columns -Dense
    }
    New-UDCard -Body $Body -Header $Header
}