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What is initial value of an empty drop-down?

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Level 3

I have written a script to populate the items in a drop-down list but only if there is no entry already existing.

The problem I have is recognizing that the list is empty. I have tried to test for null (if dropdown.isNull = true) and testing the

rawValue = "" and a bunch of other things with no good result.

I'm sure this is easy but apparently not for me.

Thanks for the help!

1 Accepted Solution

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Correct answer by
Former Community Member

Those commands are testing the value that is selected by the user. As they have not selected anything yet they will not have a value.

The command:

DropDownList1.items.nodes.length

Will give you the number of items in the DDlist. It is 1 based. Note that it will not count any items that were added to the dropdown by the user.

Paul

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3 Replies

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Correct answer by
Former Community Member

Those commands are testing the value that is selected by the user. As they have not selected anything yet they will not have a value.

The command:

DropDownList1.items.nodes.length

Will give you the number of items in the DDlist. It is 1 based. Note that it will not count any items that were added to the dropdown by the user.

Paul

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Level 3

Both are correct! Thanks for the assistance!

The following has evaluated to null or missing: ==> liqladmin("SELECT id, value FROM metrics WHERE id = 'net_accepted_solutions' and user.id = '${acceptedAnswer.author.id}'").data.items [in template "analytics-container" at line 83, column 41] ---- Tip: It's the step after the last dot that caused this error, not those before it. ---- Tip: If the failing expression is known to be legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)?? ---- ---- FTL stack trace ("~" means nesting-related): - Failed at: #assign answerAuthorNetSolutions = li... [in template "analytics-container" at line 83, column 5] ----