The advanced search tab clearly harnesses the core’s shadow tiddler $:/core/modules/filters.js to display one of these messages…
Filter error: Missing [ in filter expression
Filter error: Missing closing bracket in filter expression
… when there’s an incomplete filter expression.
I’d like to harness this ability to display a filter-syntax-error message (when user-entered filter is incomplete) in this way. Oddly, this seems to be one place where the actual English language is baked into the core, rather than harnessing a language-specific message. Am I missing something?
We do have a language tiddler $:/language/Error/FilterSyntax — but this doesn’t seem to be harnessed directly by anything else in the core.
What’s the most integrated way to monitor an input-field’s content to conditionally display the syntax error (ideally in language-specific fashion, and ideally specifying which kind of bracket is missing), or to offer some desired behavior only if/when the filter seems syntactically ok?