Conditional Html Style In Powershell
I have a script to display VM disk status for our vCenter. I would like to be able to highlight the rows in which 'Free Space%' is less than 20. I can't find a way to isolate this
Solution 1:
By manually outputting the table as advised by Matt, and using some CSS classes (please don't use inline styling (style="..." in the HTML tags), add classes in the CSS stylesheet, as you already have one), you can achieve this.
Also, check the changes I made to the CSS, it's a bit shorter (and more readable like this).
I have a similar script running at work that displays the content of a CSV file on a webpage, adding classes on the fly depending of the values.
CSS :
<style>body {
background: #003366;
height: 100%;
width: 100%;
padding: 0;
}
table{
text-align: center;
width: 850px;
padding-bottom: 10px;
border: 1px solid black;
margin: 0 auto;
font-family: Georgia;
}
th {
border: 1px solid black;
padding: 5px;
background-color: grey;
color: #FFDB4D;
}
td {
border: 1px solid black;
padding: 2px;
background-color: grey;
color: white;
}
p {
font-size: 3em;
text-align: center;
font-family: Georgia;
color: #FFDB4D
}
tr.under-20td {
/* this targets cells in rows having class="under-20" */background-color: red;
font-weight: bold;
}
</style>With a for / foreach loop, you can output the table structure which is basically :
HTML :
<table><!-- table start --><tr><!-- row start --><th>First name</th><!-- header cell --><th>Last name</th><!-- header cell --></tr><!-- row end --><tr><!-- row start --><td>John</td><!-- normal cell --><td>Doe</td><!-- normal cell --></tr><!-- row end --><trclasss="under-20"><!-- cells in this row will have a red background based on the stylesheet above --><td>Jane</td><td>Doe</td></tr></table><!-- table end -->Example of PS code to generate the table (feel free to ask if you don't get it) :
$title = "page title goes here"
$stylesheet = "/* CSS goes here */
body {
font-family: Arial, sans-serif
}
th {
background-color: grey;
}
tr.under-20 td {
background-color: red;
color: white;
}"
$html = "<html>
<head>
<title>$title</title>
<style>`n`
$stylesheet`n`
</style>
</head>
<body>"foreach ($vm in $servers) {
$html += "`n`t`t<table>`
`n`t`t`t<tr>`
`n`t`t`t`t<th>Name</th>`
`n`t`t`t`t<th>Path</th>`
`n`t`t`t`t<th>Capacity</th>`
`n`t`t`t`t<th>Free space (MB)</th>`
`n`t`t`t`t<th>Free space (%)</th>`
`n`t`t`t</tr>"foreach($disk in $vm.extensiondata.Guest.Disk) {
$name = $vm.name
$diskpath = $disk.Diskpath
$capacity = [math]::Round($disk.Capacity/ 1MB)
$freeSpace = [math]::Round($disk.FreeSpace/ 1MB)
$freePercent = [math]::Round(((100 * $disk.FreeSpace) / $disk.Capacity), 0)
if($freePercent -le 20) {
$rowclass = "under-20"
} else {
$rowclass = ""
}
$html += "`n`t`t`t<tr class=`"$rowclass`">``n`t`t`t`t<td>$name</td>``n`t`t`t`t<td>$diskpath</td>``n`t`t`t`t<td>$capacity</td>``n`t`t`t`t<td>$freeSpace</td>``n`t`t`t`t<td>$freePercent</td>``n`t`t`t</tr>"
}
$html += "`n`t`t</table>"
}
$html += "`n`t</body>`n</html>"
$html | Out-File "diskreport.html"
Escaped tabs and newlines provide code indentation, trailing backticks in the strings are intended.
Solution 2:
Found Set-CellColor function at
https://community.spiceworks.com/topic/843831-convert-html-background-cell-color-based-on-condition
But it seemed to be broke. Fixed the per-cell functionality but have not tested the -ROW switch
Function Set-CellColor {
<#
.SYNOPSIS
Function that allows you to set individual cell colors in an HTML table
.DESCRIPTION
To be used inconjunction with ConvertTo-HTML this simple function allows you
to set particular colors for cells in an HTML table. You provide the criteria
the script uses to make the determination if a cell should be a particular
color (property -gt 5, property -like "*Apple*", etc).
You can add the function to your scripts, dot source it to load into your current
PowerShell session or add it to your $Profile so it is always available.
To dot source:
.".\Set-CellColor.ps1"
.PARAMETER Property
Property, or column that you will be keying on.
.PARAMETER Color
Name or 6-digit hex value of the color you want the cell to be
.PARAMETER InputObject
HTML you want the script to process. This can be entered directly into the
parameter or piped to the function.
.PARAMETER Filter
Specifies a query to determine if a cell should have its color changed. $true
results will make the color change while$false result will return nothing.
Syntax
<Property Name> <Operator> <Value>
<Property Name>::= the same as $Property. This must match exactly
<Operator>::= "-eq" | "-le" | "-ge" | "-ne" | "-lt" | "-gt"| "-approx" | "-like" | "-notlike"
<JoinOperator> ::= "-and" | "-or"
<NotOperator> ::= "-not"
The script first attempts to convert the cell to a number, and if it fails it will
cast it as a string. So 40 will be a number and you can use -lt, -gt, etc. But 40%
would be cast as a string so you could only use -eq, -ne, -like, etc.
.PARAMETER Row
Instructs the script to change the entire row to the specified color instead of the individual cell.
.INPUTS
HTML with table
.OUTPUTS
HTML
.EXAMPLE
get-process | convertto-html | set-cellcolor -Propety cpu -Color red -Filter "cpu -gt 1000" | out-file c:\test\get-process.html
Assuming Set-CellColor has been dot sourced, run Get-Process and convert to HTML.
Then change the CPU cell to red only if the CPU field is greater than 1000.
.EXAMPLE
get-process | convertto-html | set-cellcolor cpu red -filter "cpu -gt 1000 -and cpu -lt 2000" | out-file c:\test\get-process.html
Same as Example 1, but now we will only turn a cell red if CPU is greater than 100
but less than 2000.
.EXAMPLE
$HTML = $Data | sort server | ConvertTo-html -head$header | Set-CellColor cookedvalue red -Filter "cookedvalue -gt 1"
PS C:\> $HTML = $HTML | Set-CellColor Server green -Filter "server -eq 'dc2'"
PS C:\> $HTML | Set-CellColor Path Yellow -Filter "Path -like ""*memory*""" | Out-File c:\Test\colortest.html
Takes a collection of objects in$Data, sorts on the property Server and converts to HTML. From there
we set the "CookedValue" property to red if it's greater then 1. We then send the HTML through Set-CellColor
again, this time setting the Server cell to green if it's "dc2". One more time through Set-CellColor
turns the Path cell to Yellow if it contains the word "memory"in it.
.EXAMPLE
$HTML = $Data | sort server | ConvertTo-html -head$header | Set-CellColor cookedvalue red -Filter "cookedvalue -gt 1" -Row
Now, if the cookedvalue property is greater than 1 the function will highlight the entire row red.
.NOTES
Author: Martin Pugh
Twitter: @thesurlyadm1n
Spiceworks: Martin9700
Blog: www.thesurlyadmin.com
Changelog:
1.6 Fixed missing Style=`" and other mising double quotes or un-escaped, -ROW switch not tested
1.5 Added ability to set row color with -Row switch instead of the individual cell
1.03 Added error message in case the $Property field cannot be found in the table header
1.02 Added some additional text to help. Added some error trapping around $Filter creation.
1.01 Added verbose output
1.0 Initial Release
.LINK
http://community.spiceworks.com/scripts/show/2450-change-cell-color-in-html-table-with-powershell-set-cellcolor
#>
[CmdletBinding()]
Param (
[Parameter(Mandatory=$True,Position=0)]
[string]$Property,
[Parameter(Mandatory=$True,Position=1)]
[string]$Color,
[Parameter(Mandatory=$True,ValueFromPipeline)]
[Object[]]$InputObject,
[Parameter(Mandatory=$True)]
[string]$Filter,
[Parameter(Mandatory=$False)]
[switch]$Row
)
Begin {
Write-Verbose "$(Get-Date): Function Set-CellColor begins"
If ($Filter) {
If ($Filter.ToUpper().IndexOf($Property.ToUpper()) -ge 0) {
$Filter = $Filter.ToUpper().Replace($Property.ToUpper(),"`$Value")
Try {
[scriptblock]$Filter = [scriptblock]::Create($Filter)
} Catch {
[string]$ErrorMessage = "$($_.Exception.Message) $($_.ScriptStackTrace) $($_.Exception.InnerException)"
Write-Warning "$(Get-Date): ""$Filter"" caused an error
`r`n $ErrorMessage"
Return
}
} Else {
Write-Warning "Could not locate $Propertyin the Filter, which is required. Filter: $Filter"
Return
}
}
}
Process {
ForEach ($Line in $InputObject) {
If ($Line.IndexOf("<tr><th") -ge 0)
{ Write-Verbose "$(Get-Date): Processing headers..."
$Search = $Line | Select-String -Pattern '<th ?[a-z\-:;"=]*>(.*?)<\/th>' -AllMatches
$Index = 0
ForEach ($Match in $Search.Matches) {
If ($Match.Groups[1].Value -eq $Property) { Break }
$Index ++
}
If ($Index -eq $Search.Matches.Count) {
Write-Warning "$(Get-Date): Unable to locate property: $Property in table header"
Return
}
Write-Verbose "$(Get-Date): $Property column found at index: $Index"
}
If ($Line -match "<tr( background-color:.+?"")?><td") {
$Search = $Line | Select-String -Pattern '<td ?[a-z\-:;"=]*>(.*?)<\/td>' -AllMatches
$Value = $Search.Matches[$Index].Groups[1].Value -as [double]
If (-not $Value) {
$Value = $Search.Matches[$Index].Groups[1].Value
}
If (Invoke-Command $Filter) {
If ($Row) {
Write-Verbose "$(Get-Date): Criteria met! Changing row to $Color..."
If ($Line -match "<tr background-color:(.+?)"">") {
$Line = $Line -replace "<tr Style=`"background-color:$($Matches[1])`"","<tr Style=`"background-color:$Color`""
}
Else {
$Line = $Line.Replace("<tr>","<tr Style=`"background-color:$Color`">")
}
}
Else {
Write-Verbose "$(Get-Date): Criteria met! Changing cell to $Color..."
$Line = $Line.Replace($Search.Matches[$Index].Value,"<td Style=`"background-color:$Color`">$Value</td>")
}
}
} Else {
# Write-Host "no Match"
}
Write-Output $Line
}
}
End {
Write-Verbose "$(Get-Date): Function Set-CellColor completed"
}
}
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