需要 javascript 表单验证器的帮助

Question

i am relatively new to javascript and have to design a form vlalidator with the following fields

name must start with a capital letter and must have only the characters a-z and A-Z and 

password_field => (must contain atleast two symbols from the list [ @,#,$,%,^,& ] 

whats the best way to meet all the above conditions? should i use regex c or what?

Answer 1

For capital letter this holds: str[0] >= 'A' && str[0] <= 'Z' .

Only letters: a regexp like /^[az]$/i should match.

Length: str.length >= 10 .

Symbols: regexp like str.replace(/[^@#$%^&]+/, "").length >= 2 .

If you want to only use regexps for the password, you could do:

/[@#$%^&]{2,}/.test(str) && /.{10,}/.test(str)

Answer 2

regex will definitively be helpful.

here is an axample of a validator, which is easy to customize: validator

it just requires some kind of translate method - or just replace the calls with your output text.

in the html you set classes for each validator-specification like capitalletter:

<input class="capitalletter" type="text" name="somename" />

and then implement the function capitalletter in the validator object...

JS call will be:

var my_validator = new validator(yourformID);
my_validator.validate()