CoffeeScript execute functions from string with parameters

Question

I have in my html something like this:

<input type="text" data-validators="length(5,25);notNull();links(1);" />

Functions: length, notNull and links are in my Validation class. I am getting these functions with jQuery

  $(this).find('[data-validation]').each ->
    validatorsString = $(this).attr "data-validation"
    validatorsArray = validatorsString.split ";"
    validatorsObject = new Validation($(this).val())
    for v in validatorsArray
      if typeof validatorsObject[v] == "function"
        validatorsObject[v]

This works fine when I dont use parameters (arg1, arg2) but now I want to use parameters. How to check if these functions exists in class and execute it with paramters (with no limits, it can be 1, 5, 10 params)

bokonic · Accepted Answer · 2013-05-26 23:44:44Z

3

Since you can't dynamically call functions with arguments as strings (unless you use eval), the best method to achieve the functionality you want you'll have to parse your data-validation information:

given this string: validatorsString="length(5,25);notNull();links(1);", you could parse it into function names and arguments using a regular expression:

validatorsString.replace(/([\w_$]+)\(([\w_$,]+)\)/g, (all, fn, args) ->
  args = args.split ',' if args
  if typeof validatorsObject[fn] is 'function'
    validatorsObject[fn].apply validatorsObject, args
)

edited May 26, 2013 at 23:44

answered May 26, 2013 at 15:57

bokonic

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