You should always include the full error message (and backtrace if available) as well as telling us the relevant version of Go you used to compile your program and the particular package you believe is the source of the problem. A minimal reproducible example is also a good idea if feasible.
In this case we're guessing you're using https://pkg.go.dev/html/template but we shouldn't have to guess. Jon guessed that the error is from a Javascript interpreter, and not a Go stdlib package, because of the lack of context and the wording of the partial error message you gave us. I'm guessing the error is from src/text/template/exec.go: s.errorf("can't evaluate field %s in type %s", fieldName, typ) Note that html/template delegates the actual substitution to text/template. The documentation for html/template ( https://pkg.go.dev/html/template@go1.23.4) explicitly states that the HTML type should not contain comments: HTML encapsulates a known safe HTML document fragment. It should not be used for HTML from a third-party, or HTML with unclosed tags or comments. The outputs of a sound HTML sanitizer and a template escaped by this package are fine for use with HTML. Whether that package comment is relevant is unclear since you didn't provide enough information for us to do more than make educated guesses. I took the first example program at https://pkg.go.dev/html/template@go1.23.4 and inserted your string as the first line of the "const tpl = ..." definition. That resulted in this runtime failure: 2024/12/30 23:28:23 template: webpage:2:21: executing "webpage" at <.nonExistingData>: can't evaluate field nonExistingData in type struct { Title string; Items []string } Does that look like the error you're seeing? On Mon, Dec 30, 2024 at 11:23 AM atilkan <emrahatil...@gmail.com> wrote: > Hi, > I am trying to add html comment (yes, they will be removed). I believe it > strips the comments after processing the template. If you put non-existing > property inside html comments, it throws error. > Maybe better to strip comments before processing the template? > > `<!-- <input value='{{.nonExistingData}}'> -->` > > I would paste the whole error but you have to search needle in haystack. > Basically says* "can't evaluate field nonExistingData"*. > > > Have a nice day. > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion visit > https://groups.google.com/d/msgid/golang-nuts/10547051-0324-4257-a81d-33644d92bca5n%40googlegroups.com > <https://groups.google.com/d/msgid/golang-nuts/10547051-0324-4257-a81d-33644d92bca5n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- Kurtis Rader Caretaker of the exceptional canines Junior and Hank -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/golang-nuts/CABx2%3DD-RKO%3DMtnWz5R2iu792G%2B8OsRtgKBNHDti%3DjNeyV0DmHw%40mail.gmail.com.
