Javascript String.fromCharCode Case Sensitivity?

问题:

I am simply listening for a keyup event of an input element and gather the results into a string like so

word=word+String.fromCharCode(key.keyCode);

The problem is that the word is in capital letters while I want it to be case-sensitive. For example if I type abcef my accumulated word becomes 'ABCEF' .

Note - I need a pure javascript solution (no libraries..) Any thoughts?

回答1:

Events like keyup and keydown will return 65 for both a and A (and also true for event.shiftKey if that key is held down).

The keypress event returns different keycodes for upper and lower case letters, so to get this working case sensitive you should use the keypress event, and fromCharCode() will return the correct letter, case sensitive.

回答2:

You can always call .toLowerCase()

word = word + String.fromCharCode(key.keyCode).toLowerCase();

Might make more sense to call .toLowerCase() just once, at the point you decide you're finished accumulating characters.