DZone Snippets: validation code

jquery validation not clearing errors example

joshjdevl (Josh) — Thu, 26 Jun 2008 16:38:17 GMT

// jquery validation example not clearing error messages







  





    

  





  



   
























        
                          
                    
        Email Address


                
        
    

        Password


                
        

    
        Re-enter password

Rails validation for Phone

sikelianos (Zeke Sikelianos) — Thu, 31 Jan 2008 00:38:40 GMT



  validates_length_of :phone, :is => 10, :message => 'must be 10 digits, excluding special characters such as spaces and dashes. No extension or country code allowed.', :if => Proc.new{|o| !o.phone.blank?}

  validates_length_of :fax, :is => 10, :message => 'must be 10 digits, excluding special characters such as spaces and dashes. No extension or country code allowed.', :if => Proc.new{|o| !o.fax.blank?}

Mark directories to be deleted based on their date-stamp

jrobertson (James Robertson) — Sun, 30 Dec 2007 17:33:47 GMT

This Ruby code selects file directories which are older than a certain date and outputs an XML file naming all the directories to be removed. It does this by reading a directory listing formatted within the XML file 'dir.xml', all directories are named by a date-stamp, which is used to determine if the directory should be removed.

This example is used to maintain the webcamera (named 'pear') which saves it's images to a date-stamped directory daily. Any directory which is older than 14 days will be marked for deletion.



  def directory_housekeeping()

    lifespan = 14

    format_mask = 'm_d_y'

    separator = format_mask.match(/[\_*\-]/).to_s

    

    earliest_date = Time.now + (60 * 60 * 24) * -lifespan

    cut_off_date = Date.new(y=earliest_date.year,m=earliest_date.month,d=earliest_date.day)

        

    a_format = Array.new

    a_format[0] = format_mask.match(/^[y,m,d]*/).to_s

    a_format[1] = format_mask.match(separator + '[y,m,d]*').to_s.gsub(separator,'')

    a_format[2] = format_mask.match('[y,m,d]$').to_s

    

    file = File.new('../housekeeping/webcam_pear/dir.xml')

    ddoc = REXML::Document.new(file)

    file.close

    

    file_delete = File.new('../housekeeping/webcam_pear/files2delete.xml', 'w')

    doc_delete = Document.new()

    doc_delete.add_element('files')

    

    ddoc.root.elements.each('file') do |file_node|

      sfile = file_node.text

      idate = Array.new

      idate[0] = sfile.match(/^\d*/).to_s.to_i

      idate[1] = sfile.match(/\_\d*/).to_s.gsub(separator,'').to_i

      idate[2] = sfile.match(/\_\d*\d$/).to_s.gsub(separator,'').to_i



      h = Hash.new

      0.upto(2) {|i| h[a_format[i]] = idate[i]}



      file_date = Date.new(y=h['y'], m=h['m'], d=h['d'])



      if file_date < cut_off_date

        o_file2delete = Element.new('file')

        o_file2delete.text = file_date.strftime(dformat)

        doc_delete.root.add_element o_file2delete

      end

    end

    file_delete.puts doc_delete

  end

file: dir.xml

file: files2delete.xml

Using Regular Expressions to validate a fixed length numerical string.

jrobertson (James Robertson) — Tue, 09 Oct 2007 11:55:10 GMT

Using Ruby and Regular Sxpressions, this code successfully validates a string if it contains exactly 3 numbers.



a = '547'

/^\d\d\d$/ ~= a

Using Regular Expressions to validate a numerical string.

jrobertson (James Robertson) — Tue, 09 Oct 2007 11:45:13 GMT

Using Ruby and Regular Expressions, this code validates a string for numbers only. If the string variable contains only numbers then 0 will be returned otherwise nil.



a = '134323'

/^[0-9]*$/ =~ a

#result returns 0, indicating success

Rails URL Validation

jnewland (Jesse Newland) — Wed, 12 Sep 2007 14:03:00 GMT

No regexes, allows URLs with ports or IPs. Inspiration from here



  validates_each :href, :on => :create do |record, attr, value|

    begin

      uri = URI.parse(value)

      if uri.class != URI::HTTP

        record.errors.add(attr, 'Only HTTP protocol addresses can be used')

      end

    rescue URI::InvalidURIError

      record.errors.add(attr, 'The format of the url is not valid.')

    end

  end

validate parent model

edxerx (Ed Erx) — Fri, 11 May 2007 01:22:55 GMT

Validate a parent model in child model
based on a post at http://www.railsweenie.com/forums/1/topics/439
question : can this be improvised?

Book (parent)



class Book < ActiveRecord::Base

  has_many :pages

end

Pages (children)



class Pages < ActiveRecord::Base

  belongs_to :book

  

  validates_presence_of :page_id # this is not enough, anything can go in this field



  # we check if the parent object is valid or not

  validate do |page|

   if page.blank?

     unless page.book(true)

       errors.add(:page_id, "must be a valid Book id")

     end

   end

  end



end

Snazzy url fixer using Ruby's super method

sikelianos (Zeke Sikelianos) — Thu, 10 May 2007 22:46:46 GMT

Within the body of a method, a call to super acts just like a call to that original method, except that the search for a method body starts in the superclass of the object that was found to contain the original method.



  def url=(addr)

    super (addr.blank? || addr.starts_with?('http')) ? addr : "http://#{addr}"

  end

Validate uniqueness of an id pair

sikelianos (Zeke Sikelianos) — Wed, 09 May 2007 02:22:57 GMT



# Prevent user from joining group twice

def validate

	errors.add_to_base("You are already a member of the #{self.group.name} Group") unless Grouping.find(:all, :conditions => {:user_id => self.user_id, :group_id => self.group_id}).blank?

end

Javascript numeric validation

leftist (Pete Forde) — Mon, 29 Jan 2007 11:37:31 GMT

I've seen a lot of takes on numeric validation, and most have serious flaws. For example, (!isNaN) returns inconsistent results and shouldn't be used to verify numericality. This should cover all cases, and supports a decimal point as well as negative numbers.



function isNumeric(value) {

  if (value == null || !value.toString().match(/^[-]?\d*\.?\d*$/)) return false;

  return true;

}

This logic is straight-forward: if the parameter isn't null, convert it to a string and match it against a RegEx to throw out false cases. Otherwise, return true.