Logic - do not display if value is empty

Question

In my gridColum, I am displaying an email link, with an envelope-o icon.

However, if the value of the field is empty or null, it's still displaying the icon.

How do I add the if logic to this code to not display the icon if the value of the field is empty or null? I've edited the code below to shorten the field recordtype! info.

a!richTextDisplayField(
  value: {
    a!richTextItem(
      text: {
        a!richTextIcon(
          icon: "envelope-o"
        ),
        a!localVariables(
          local!fullString: fv!row['recordType!technicalPointOfContact'],
          extract(
            "--beginning--" & " " & local!fullString,
            "g--",
            " <"
          )
        )
      },
      link: a!safeLink(
        uri: "mailto://" & extract(fv!row['recordType!technicalPointOfContact'], "<",">")
      )
    )
  }
)

In addition the following code is throwing "Invalid Syntax errors"

  link: a!safeLink(
        uri: "mailto://" & extract(fv!row['recordType!technicalPointOfContact'], "<",">")
      ),
   linkStyle: "STANDALONE" <--- invalid syntax???
   )

Mike Schmitt · Accepted Answer

Here's an expression rule I just whipped up that will extract the name and email, presuming the formatting is exactly on-spec and no funny business has happened with special characters. Note that extract() returns an array, so we have to take care to cast that as a singular result (my favorite way is just to take the first index() of the result). 
 a!localVariables(
 local!name: index(extract(
 "--beginning--" & ri!emailString,
 "ng--",
 " <"
 ), 1, null()),
 
 local!email: index(extract(
 ri!emailString,
 "<",
 ">"
 ), 1, null()),

a!map(
 name: local!name,
 email: local!email
 )
)

Mike Schmitt · Answer

Given that, you would re-write your original column value to something more like this, assuming we call the above expression rule " rule!GLBL_parseEmail() " for example: 
 a!richTextDisplayField(
 value: a!localVariables(
 local!emailMap: rule!GLBL_parseEmail(emailString: fv!row['recordType!POC etc']),
 {
 a!richTextItem(
 showWhen: a!isNotNullOrEmpty(local!emailMap.email),
 text: {
 a!richTextIcon(
 icon: "envelope-o"
 ),
 local!emailMap.name
 },
 link: a!safeLink(
 uri: "mailto://" & local!emailMap.email
 ),
 linkStyle: "STANDALONE"
 ),
 
 a!richTextItem(
 showWhen: a!isNullOrEmpty(local!emailMap.email),
 text: "(none)",
 size: "SMALL",
 style: "EMPHASIS",
 color: "SECONDARY"
 )
 }
 )
)

Yogi Patel · Answer

Add showhen condition in a!richTextDisplayField. 
 a!richTextDisplayField(
 value: {
 a!richTextItem(
 )
 },
 showWhen: a!isNotNullOrEmpty(fv!row['recordType!technicalPointOfContact'])
)

Mike Schmitt · Answer

You really, really, really ought to consider moving this parser to its own expression rule. Trying to have this code hard-coded into a grid like this just makes stuff un-readable, and then of course when you get little errors like this it's also very hard to test.

Mike Schmitt · Answer

I would suggest putting the showWhen condition in the RichTextItem object actually - the richTextDisplayField still needs to show up (afaik) so the column has some content, even if it's blank. additionally my normal trick here would be to add one extra RichTextItem to the displayField's array, set to show ONLY when the email is blank, in which case i show like " (none) " using nice richText formatting also.

Logic - do not display if value is empty

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