[whatwg] Proposal: Adding methods like getElementById and getElementsByTagName to DocumentFragments

[Glenn Maynard]

On Thu, Oct 10, 2013 at 9:22 AM, Boris Zbarsky <bzbarsky at mit.edu> wrote:

> On 10/10/13 10:15 AM, Glenn Maynard wrote:
>
>> When I'm doing this I just make sure that the strings don't need
>> escaping in the first place.  Many of these look like they do that
>> (probably most "ID" cases are things like random numbers or
>> alphanumerics).
>>
>
> Let's take a look at Simon's examples from actual web pages:
>
>   .querySelectorAll("#"+M+" "+m)
>   .querySelectorAll('.'+classes[**i])
>
> If M is a random number, it needs escaping.  Similar if classes[i] is a
> random number.  In particular, ID and class selectors cannot start with a
> digit.


That's why I said "many".  There are obviously several cases that do need
escaping.


>  FWIW, I rarely use IDs at all: I use classes, even if there will
>> probably only be one of something.
>>
>
> Classes have the same syntax as IDs in CSS (both are identifiers), so it's
> the same issue.
>

My point was that I never use getElementById (and getElementsByClassName
returns an array, so it's wrong too).

-- 
Glenn Maynard