Check values in a form (Javascript) -

-



i've 5 variables in form, simplicity named them a, b, c, d , e. in order submit form (a or (b or c)) , (d or e) must have value (i hope it's clear :p). i've tried with

if ((a == "" || (b == "" || c == "")) && (d == "" || e == "")) {     alert ("error!"); } else {     form.submit(); }

but doesn't work in every case. example, if a, b , c have value, form submitted if neither d or e have values. thank help!

if have strings, reverse condition , check logical , and 1 or.

var = '', b = '', c = '', d = '', e = '';        if (a && b && c || d && e) {      console.log('form.submit();');  } else {      console.log('error!');  }

why works:

given

(a == "" || (b == "" || c == "")) && (d == "" || e == "")

simplified a == "" equivalent !a

(a == "" || b == "" || c == "") && (d == "" || e == "")  (!a || !b || !c) && (!d || !e)

de morgan's laws !(a && b) = !a || !b or !(a || b) = !a && !b

 (!a || !b || !c) && (!d || !e)   !(a &&  b &&  c) && !(d &&  e)  !((a &&  b &&  c) ||  (d &&  e))

operator precedence

!(a && b && c || d && e)

now switch/negate <-> else

a && b && c || d && e




wiki

Comments

Post a Comment

Popular posts from this blog

python - Read npy file directly from S3 StreamingBody -

-
i have many .npy (numpy) , .json files saved in s3, need download , load these files. for json files downloading files , loading dictionary using following code: obj = s3.object(bucket, key) response = obj.get() body = response['body'].read().decode('utf-8') data = json.loads(body) that way avoid writing .json file disk , reading it. now want same .npy files, equivalent? currently downloading file, saving temp file on disk , loading np.load avoid if possible. following https://stackoverflow.com/a/28196540/3509999 : obj = s3.object(bucket, key) io.bytesio(obj.get()["body"].read()) f: # rewind file f.seek(0) arr = np.load(f) wiki
Read more

kotlin - Out-projected type in generic interface prohibits the use of metod with generic parameter -

-
i start using kotlin , defined interface this: interface aadapter<vh : recyclerview.viewholder> { fun oncreateaviewholder(parent: viewgroup): vh fun onbindaviewholder(v: vh, position: int) } and when try use on code: class klasa ( private val adapter: aadapter<*> ) { fun dosth(){ //... val vh = this.adapter.oncreateaviewholder(parent) //on below line error adapter.onbindaviewholder(v, position) //... } } i error out-projected type 'aadapter<*>' prohibits use of 'public abstract fun onbindaviewholder(v: t, position: int): unit i tied add "in" or "out" definition i'm confused. how allow it. replace aadapter<*> aadapter<recyclerview.viewholder> . class klasa ( private val adapter: aadapter<recyclerview.viewholder> ) { // ... because have declared aadapter has type parameter vh type subclass of recyclerview....
Read more

Asterisk AGI Python Script to Dialplan does not work -

-
i'm stuck project have check database of sip extension incoming caller id , dial sip extension. below receive when run script on asterisk cli. -- registered sip '9125' @ 192.168.1.102:50142 > saved useragent "zoiper rv2.8.40" peer 9125 [2017-08-22 13:53:33] notice[5095]: chan_sip.c:24558 handle_response_peerpoke: peer '9125' reachable. (17ms / 2000ms) == using sip rtp tos bits 184 == using sip rtp cos mark 5 -- executing [0112617769@from-trunk:1] answer("sip/obitrunk1-0000000d", "") in new stack > 0x1ca50d0 -- probation passed - setting rtp source address 192.168.1.98:16834 -- executing [0112617769@from-trunk:2] agi("sip/obitrunk1-0000000d", "test.py") in new stack -- launched agi script /var/lib/asterisk/agi-bin/test.py args: ['/var/lib/asterisk/agi-bin/test.py'] env line: agi_request: test.py env line: agi_channel: sip/obitrunk1-0000000d env line: agi_language: en env line: a...
Read more