> Le 8 août 2019 à 11:07, fanerge <[email protected]> a écrit :
>
> There are many such requirements in a real development scenario, such as how
> many characters are allowed to be entered by the user, which is something we
> should consider not in Unicode for Basic Multilingual Plane.
I have cases where I want to limit the length of user input, for which purpose
I just use <input maxlength>, although it gives inconsistent results across the
three browsers I have tested: two of them limit the number of UTF-16 code
units, one of them limits the number of grapheme clusters (and none of them
limit the number of code points).
In fact, for my purpose, I have no reason to impose a limit for a precise
number of *code points* (as opposed to other possible definitions of “length”
such as *UTF-16 code units* or *grapheme clusters*). Technically, I am usually
limited by the size of a column in the database, for which the “size”
corresponds typically to the number of bytes in a UTF-8 encoded string. From a
user point-of-view, the number of “characters” is better approximated by the
number of grapheme clusters. None of those two notions of “length” correspond
to the number of code points.
—Claude
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