function for evaluating string data type

[herci]

hi everybody..
I would like to know if it exist any function in Java or Javascript that I can use to evaluate if a data is numeric or string..


thanks very much

 

[onpnt]

you can test the value with regular expressions to see if the value for one can be converted to integer or is a string

if there are any characters other then digits in the value it will not convert to int correctly. you can also use
new string()

http://www.devguru.com/Technologies/ecmascript/quickref/string.html

new Boolean()

http://www.devguru.com/Technologies/ecmascript/quickref/boolean.html

parseFloat

http://www.devguru.com/Technologies/ecmascript/quickref/parsefloat.html

parseInt

http://www.devguru.com/Technologies/ecmascript/quickref/parseint.html

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[adam0101]

You can use the isNaN() function to test if it is "Not A Number"

Adam
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[EdwardMartinIII]

herci,

JavaScript is basically nontyped. You can check for the presence of certain characters in the string, but that means you have to decide what your rules are and then code to implement them. This depends on the purpose for which you are coding.

What do you think should be considered an "alpha" and what is a numeric? For example:

"3847598374956734985349857349085734905873098739087598364896387236458976348905726350324650237456027346508234608235603246502346532487563249732450834650364508732645086234508723450873645087634508763240872634087263450872634807236408726589724368972365087243650872346098234698235623457623508326405236.2000000000000000000000000000000000000000001"
"7.45.55"
"fourteen"
" 19 "
"(5)"
"6*4"
"!0------------0!"
"44!" (the result of the factorial operation on 44)
"4!" (the cry of a Hank Aaron fan)
"90210-4103" (a ZIP code)
"(206) 555-1212"
"123-45-6789" (a SSN)

Oooh, validation can be so fun!

Cheers,


Edward

"Cut a hole in the door. Hang a flap. Criminy, why didn't I think of this earlier?!" -- inventor of the cat door