DZone Snippets: add code

Increment a date using Ruby

jrobertson (James Robertson) — Wed, 05 Mar 2008 13:43:34 GMT

This Ruby code converts a string into a date and increments the day, week, month, quarter or year.



def date_add(sdate='', unit='',i=0)



  sdate[/(\d+)\/(\d+)\/(\d+)\s(\d+):(\d+):(\d+)/]

  iyear = $3.to_i; imonth = $2.to_i; iday = $1.to_i; ihour = $4.to_i; imin = $5.to_i; isec = $6.to_i

  

  case  unit

    when 'days'

      t1 = Time.local(iyear,imonth,iday,ihour,imin,isec)

      t1 += (60 * 60 * 24 * i)

    when 'weeks'

      t1 = Time.local(iyear,imonth,iday,ihour,imin,isec)

      t1 += (60 * 60 * 24 * 7 * i) 

    when 'months'

      imonth += i

      if imonth < 12 then

        t1 = Time.local(iyear,imonth+i,iday,ihour,imin,isec)

      else

        t1 = Time.local(iyear+=1,imonth -12,iday,ihour,imin,isec)

      end

    when 'quarter'

      imonth += 3

      if imonth <= 12 then

        t1 = Time.local(iyear,imonth,iday,ihour,imin,isec)

      else

        t1 = Time.local(iyear+=1,imonth - 12,iday,ihour,imin,isec)

      end    

    when 'years'

      t1 = Time.local(iyear+i,imonth,iday,ihour,imin,isec)

    else

      raise 'not a valid date unit'

  end

  t1

end



date_add("17/03/2008 17:48:00",'months',2)

output: Sat May 17 17:48:00 +0100 2008

svn-add-all-new-files

sessy (sessy) — Wed, 31 Oct 2007 10:00:54 GMT

alias svn-add-all-new-files='svn st|grep ^?|sed s/?//|xargs svn add $1'

HTML/JavaScript - Select list - Add/Remove Options (DOM)

bradalyst (brad) — Wed, 22 Aug 2007 12:39:41 GMT

from http://www.mredkj.com/tutorials/tutorial005.html

Overview

* Insert Before Selected - A new option is created and added above the selected option (as determined by selectedIndex). If none are selected, then no option is added.
* Remove Selected - Deletes the selected option (or options) from the list. If no options are selected, no options are deleted.
* Append Last - No matter what is selected, a new option is added at the end.
* Remove Last - No matter what is selected, the last option is deleted from the list.

Explanation

According to DOM Level 1, the following is the syntax for the add and remove methods in HTMLSelectElement:

void add(in HTMLElement element, in HTMLElement before) raises(DOMException);
void remove(in long index);

The add method takes two arguments: the element to add, and the element to insert before. The spec also says you can add to the end of the list by passing null as the second argument.

The remove method just takes a number: the index of the option to be removed.

The JavaScript

The HTML







Insert Before Selected




Remove Selected









Append Last




Remove Last

Javascript Manipulate Class Names

Will_Rickards (Will Rickards) — Wed, 20 Sep 2006 21:34:35 GMT

I often have to manipulate class names of objects in javascript.
But className can have multiple classes in it.
These functions deal with that.



// ----------------------------------------------------------------------------

// HasClassName

//

// Description : returns boolean indicating whether the object has the class name

//    built with the understanding that there may be multiple classes

//

// Arguments:

//    objElement              - element to manipulate

//    strClass                - class name to add

//

function HasClassName(objElement, strClass)

   {



   // if there is a class

   if ( objElement.className )

      {



      // the classes are just a space separated list, so first get the list

      var arrList = objElement.className.split(' ');



      // get uppercase class for comparison purposes

      var strClassUpper = strClass.toUpperCase();



      // find all instances and remove them

      for ( var i = 0; i < arrList.length; i++ )

         {



         // if class found

         if ( arrList[i].toUpperCase() == strClassUpper )

            {



            // we found it

            return true;



            }



         }



      }



   // if we got here then the class name is not there

   return false;



   }

// 

// HasClassName

// ----------------------------------------------------------------------------





// ----------------------------------------------------------------------------

// AddClassName

//

// Description : adds a class to the class attribute of a DOM element

//    built with the understanding that there may be multiple classes

//

// Arguments:

//    objElement              - element to manipulate

//    strClass                - class name to add

//

function AddClassName(objElement, strClass, blnMayAlreadyExist)

   {



   // if there is a class

   if ( objElement.className )

      {



      // the classes are just a space separated list, so first get the list

      var arrList = objElement.className.split(' ');



      // if the new class name may already exist in list

      if ( blnMayAlreadyExist )

         {



         // get uppercase class for comparison purposes

         var strClassUpper = strClass.toUpperCase();



         // find all instances and remove them

         for ( var i = 0; i < arrList.length; i++ )

            {



            // if class found

            if ( arrList[i].toUpperCase() == strClassUpper )

               {



               // remove array item

               arrList.splice(i, 1);



               // decrement loop counter as we have adjusted the array's contents

               i--;



               }



            }



         }



      // add the new class to end of list

      arrList[arrList.length] = strClass;



      // add the new class to beginning of list

      //arrList.splice(0, 0, strClass);

      

      // assign modified class name attribute

      objElement.className = arrList.join(' ');



      }

   // if there was no class

   else

      {



      // assign modified class name attribute      

      objElement.className = strClass;

   

      }



   }

// 

// AddClassName

// ----------------------------------------------------------------------------





// ----------------------------------------------------------------------------

// RemoveClassName

//

// Description : removes a class from the class attribute of a DOM element

//    built with the understanding that there may be multiple classes

//

// Arguments:

//    objElement              - element to manipulate

//    strClass                - class name to remove

//

function RemoveClassName(objElement, strClass)

   {



   // if there is a class

   if ( objElement.className )

      {



      // the classes are just a space separated list, so first get the list

      var arrList = objElement.className.split(' ');



      // get uppercase class for comparison purposes

      var strClassUpper = strClass.toUpperCase();



      // find all instances and remove them

      for ( var i = 0; i < arrList.length; i++ )

         {



         // if class found

         if ( arrList[i].toUpperCase() == strClassUpper )

            {



            // remove array item

            arrList.splice(i, 1);



            // decrement loop counter as we have adjusted the array's contents

            i--;



            }



         }



      // assign modified class name attribute

      objElement.className = arrList.join(' ');



      }

   // if there was no class

   // there is nothing to remove



   }

// 

// RemoveClassName

// ----------------------------------------------------------------------------

Addition for hashes in Ruby

peter (Peter Cooperx) — Mon, 20 Feb 2006 08:48:52 GMT

Why, oh, why is there no addition for hashes in Ruby? 'update' can do the trick, but only returns what was updated, rather than the whole updated hash. It also forces an update rather than being passive.

Sometimes you only want to temporarily do an add, and this is how I pulled it off:

class Hash

  def +(add)

    temp = {}

    add.each{|k,v| temp[k] = v}

    self.each{|k,v| temp[k] = v}

    temp

  end

end

Now you can do stuff like:

x = { :a => 1 }

y = { :b => 2 }



# x + y => { :a => 1, :b => 2 }, but x and y are untouched

# x + { :c => 3 } => { :a => 1, :c => 3 }

If you want to force an add, it's easy:

x += y => { :a => 1, :b => 2 } (this is now what x contains)

add face to pane snippet

gregg.irwin (Gregg Irwin) — Thu, 19 Jan 2006 03:15:07 GMT



add-button: does [

    append lay/pane layout/offset [

        button [alert "I'm new!"]

    ] 100x100

    show lay

]

view lay: layout [size 400x300 button [add-button]]

add face to pane snippet

gregg.irwin (Gregg Irwin) — Thu, 19 Jan 2006 03:14:14 GMT



add-button: does [

    append lay/pane layout/offset [

        button [alert "I'm new!"]

    ] 100x100

    show lay

]

view lay: layout [size 400x300 button [add-button]]