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Add notes and sample code for 2015-03-12 session
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‎session-notes/2015-03-12/README.md

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# Fundamentals of Web Development
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**March 12, 2015**
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Questions:
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- Mark: objects not saving properly (using DataMapper)
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- Sagar: trouble using flash error messages
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- Theodore: updating an element on a page without a refresh
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- Guillermo: simple input form has type datetime local

‎session-notes/2015-03-12/alarmist/Gemfile

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source 'https://rubygems.org'
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gem 'sinatra'
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gem 'datamapper'
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gem 'dm-sqlite-adapter'

‎session-notes/2015-03-12/alarmist/Gemfile.lock

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GEM
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remote: https://rubygems.org/
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specs:
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addressable (2.3.7)
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bcrypt (3.1.10)
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bcrypt-ruby (3.1.5)
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bcrypt (>= 3.1.3)
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data_objects (0.10.15)
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addressable (~> 2.1)
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datamapper (1.2.0)
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dm-aggregates (~> 1.2.0)
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dm-constraints (~> 1.2.0)
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dm-core (~> 1.2.0)
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dm-migrations (~> 1.2.0)
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dm-serializer (~> 1.2.0)
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dm-timestamps (~> 1.2.0)
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dm-transactions (~> 1.2.0)
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dm-types (~> 1.2.0)
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dm-validations (~> 1.2.0)
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dm-aggregates (1.2.0)
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dm-core (~> 1.2.0)
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dm-constraints (1.2.0)
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dm-core (~> 1.2.0)
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dm-core (1.2.1)
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addressable (~> 2.3)
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dm-do-adapter (1.2.0)
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data_objects (~> 0.10.6)
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dm-core (~> 1.2.0)
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dm-migrations (1.2.0)
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dm-core (~> 1.2.0)
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dm-serializer (1.2.2)
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dm-core (~> 1.2.0)
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fastercsv (~> 1.5)
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json (~> 1.6)
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json_pure (~> 1.6)
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multi_json (~> 1.0)
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dm-sqlite-adapter (1.2.0)
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dm-do-adapter (~> 1.2.0)
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do_sqlite3 (~> 0.10.6)
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dm-timestamps (1.2.0)
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dm-core (~> 1.2.0)
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dm-transactions (1.2.0)
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dm-core (~> 1.2.0)
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dm-types (1.2.2)
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bcrypt-ruby (~> 3.0)
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dm-core (~> 1.2.0)
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fastercsv (~> 1.5)
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json (~> 1.6)
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multi_json (~> 1.0)
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stringex (~> 1.4)
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uuidtools (~> 2.1)
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dm-validations (1.2.0)
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dm-core (~> 1.2.0)
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do_sqlite3 (0.10.15)
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data_objects (= 0.10.15)
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fastercsv (1.5.5)
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json (1.8.2)
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json_pure (1.8.2)
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multi_json (1.11.0)
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rack (1.6.0)
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rack-protection (1.5.3)
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rack
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sinatra (1.4.5)
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rack (~> 1.4)
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rack-protection (~> 1.4)
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tilt (~> 1.3, >= 1.3.4)
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stringex (1.5.1)
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tilt (1.4.1)
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uuidtools (2.1.5)
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PLATFORMS
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ruby
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DEPENDENCIES
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datamapper
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dm-sqlite-adapter
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sinatra

‎session-notes/2015-03-12/alarmist/models.rb

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require 'data_mapper'
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DataMapper.setup(:default, 'sqlite:alarmist.db')
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class Alarm
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include DataMapper::Resource
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property :id, Serial
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property :area, String, required: true
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property :engaged, Boolean, required: true, default: false
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end
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DataMapper.finalize
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DataMapper.auto_upgrade!

‎session-notes/2015-03-12/alarmist/public/poll.js

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$(document).ready(function() {
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var createAlarmElement = function(alarm) {
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var area = alarm.area;
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var engaged = alarm.engaged;
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html = '<h5>' + area;
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if (engaged === true) {
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html += ' ALERT!'
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}
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html += '</h5>'
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return html
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}
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var updateAlarmList = function(alarms) {
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alarms.forEach(function(alarm, index) {
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var alarmSelector = '#' + alarm.id
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var content = createAlarmElement(alarm)
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$(alarmSelector).html(content)
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});
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}
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var queryAlarms = function() {
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console.log("Requesting '/alarms'...")
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$.getJSON('/alarms', updateAlarmList)
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};
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setInterval(queryAlarms, 5000);
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});

‎session-notes/2015-03-12/alarmist/server.rb

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require 'sinatra'
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require_relative './models.rb'
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get '/' do
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@alarms = Alarm.all
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erb :index
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end
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get '/alarms' do
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@alarms = Alarm.all
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@alarms.to_json
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end

‎session-notes/2015-03-12/alarmist/views/index.erb

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<html>
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<head>
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<title>Alarmist</title>
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<script src="https://code.jquery.com/jquery-2.1.3.js"></script>
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<script src="poll.js"></script>
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</head>
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<body>
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<% @alarms.each do |alarm| %>
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<div id="<%= alarm.id %>" class="alarm">
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<h5><%= alarm.area %>
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<% if alarm.engaged %>
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ALERT!
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<% end %>
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</h5>
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</div>
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<% end %>
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</body>
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</html>

‎session-notes/2015-03-12/flash-example/server.rb

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require 'sinatra'
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enable :sessions
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helpers do
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def flash_get(key)
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value = session[key]
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session.delete(key)
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value
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end
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def flash_save(key, value)
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session[key] = value
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end
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end
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get '/' do
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message = flash_get(:message)
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if message
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"your message is #{message}"
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else
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"no message"
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end
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end
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get '/write' do
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message = params[:message]
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flash_save(:message, [1, 2, 3, message])
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redirect '/'
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end

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