TeXnique | A LaTeX Typesetting Game | Game Engine library
kandi X-RAY | TeXnique Summary
kandi X-RAY | TeXnique Summary
A LaTeX speed-typesetting game. How many formulas can you recreate in three minutes?. "Here’s a game that puts the fun in ‘underfilled hbox’" --The Aperiodical.
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QUESTION
Currently what i do is checking if element exist in page. But my code has alot if conditions because of that. Jquery event listeners doesnt show errow when element doesnt exist. How jquery handles that and what texniques can i use for better design ?
...ANSWER
Answered 2018-May-30 at 10:47How jquery handles that...?
jQuery's API is set-based, not element-based. The DOM's API is element-based. When you do $("#foo").on("click", ...)
in jQuery, if there's no element with the id
"foo"
, $()
returns an empty set, not null
, and calling on
on that set doesn't do anything, but doesn't cause an error either.
Since getElementById
returns an element or null
, you have to have the check you've shown to prevent trying to call methods on null
, which causes an error.
If you want the benefits of a set-based API without using jQuery, you could write your own set of utility functions that use querySelectorAll
to give yourself a thin set-based wrapper around the DOM API, if you like.
Here's a very simple starter example:
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