javascript - Why is my || (OR) behaving like an && (and)? -



javascript - Why is my || (OR) behaving like an && (and)? -

i hoping 1 can help me here:

i want validate user input (email address) on html form. want both '@' (at sign) , '.' (period) nowadays in user input string.

here code check if case:

function email_checker(id_name){ var email = document.getelementbyid(id_name).value; if (email.indexof('@') == -1 && email.indexof('.') == -1){ code } }

the weird thing thing works || (logical or) operator instead of &&. so, suppose question doubles in sense;

a) if (logical or) works in code, why (logical and) not work?

b) why (logical or) work - work if (logical and) , not or?

(hope makes sense :)

i'm missing something. help much appreciated.

demorgan's laws answers why. if want have both, have check has@ , has.; failure of not(has@ , has.), breaks downwards not(has@) or not(has.), can write hasnt@ or hasnt.. current code checks hasnt@ , hasnt., equivalent not(has@ or has.) (i.e. failure against rule of "has @ to the lowest degree @ or ., not both" - not rule wanted).

javascript validation email logical-operators

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