shunchu

// focus first form field element matching these criteria
$(':input:visible:enabled:not(.no-focus, 
                              select, input[readonly=readonly], 
                              input[type=checkbox], 
                              input[type=radio], 
                              input[type=submit]):first').focus();

shunchu

http://stackoverflow.com/questions/3458553/javascript-passing-parameters-to-a-callback-function
function tryMe (param1, param2) {
    alert(param1 + " and " + param2);
}

function callbackTester (callback) {
    callback (arguments[1], arguments[2]);
}

callbackTester (tryMe, "hello", "goodbye");

shunchu

# ====================
# Spell: Dynamic Proxy
# ====================

# Forward to another object any messages that don’t match a method.

class MyDynamicProxy
  def initialize(target)
    @target = target
  end

shunchu

/* Have padding and border that cut into the element's width instead expanding it. */

textarea { 
  -webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
  -moz-box-sizing: border-box;    /* Firefox, other Gecko */
  box-sizing: border-box;         /* Opera/IE 8+ */
}

/* reference: http://css-tricks.com/box-sizing/ */

shunchu

namespace :pg do
  namespace :structure do
    # Does exactly the same as db:structure:dump but with one important
    # difference. It tries to use a compatible version of pg_dump. If you see
    # the following error message, use pg:structure:dump instead.
    #
    #   pg_dump: server version: 9.1.0; pg_dump version: 9.0.4
    #   pg_dump: aborting because of server version mismatch
    #   rake aborted!
    #   Error dumping database

shunchu

t = 236 # seconds
Time.at(t).utc.strftime("%H:%M:%S")
=> "00:03:56"

# Reference
# http://stackoverflow.com/questions/3963930/ruby-rails-how-to-convert-seconds-to-time

shunchu

#!/bin/bash

# setup
FILES=name_of_file_to_match_*.mp4
SEEK_POINT=00:00:30
IMG_FORMAT=png
FRAME_SIZE=150X100
DEST=thumbnails

for f in $FILES

shunchu

echo "gem: --no-ri --no-rdoc" >> ~/.gemrc

shunchu

# Reference: http://madebydna.com/all/code/2011/06/24/eigenclasses-demystified.html

class Dog
  def self.closest_relative
    "wolf"
  end
end

class Dog
  class << self

shunchu

# copy/paste in ~/.bash_profile and invoke it by typing "gh" in commandline

# Opens the github page for the current git repo/branch in your browser

function gh() {
  giturl=$(git config --get remote.origin.url)
  if [ "$giturl" == "" ]
    then
     echo "Not a git repository or no remote.origin.url set"
     exit 1;