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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv='X-UA-Compatible' content='IE=edge;chrome=1' />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="google-site-verification" content="qjqVOvRhHfsuDbLOvaAnj2mkUZJ9Xwzg84TMVXduvUc" />
<meta charset="UTF-8">
<title>Hyperloop - Tools for testing and debugging</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://unpkg.com/react@15/dist/react.min.js"></script>
<script src="https://unpkg.com/react-dom@15/dist/react-dom.min.js"></script>
<script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/marked/0.3.5/marked.min.js"></script>
<!-- Opal and Hyperloop -->
<script src="http://cdn.opalrb.org/opal/current/opal.min.js"></script>
<script src="https://rawgit.com/ruby-hyperloop/hyperloop-js/master/dist/opal.min.js"></script>
<script src="https://rawgit.com/ruby-hyperloop/hyperloop-js/master/dist/hyperloop.min.js"></script>
<script src="https://rawgit.com/ruby-hyperloop/hyperloop-js/master/dist/hyperloop-compiler.min.js"></script>
<!-- If you want local copies... -->
<!-- <script src="../../javascripts/opal-compiler.js"></script> -->
<!-- <script src="../../javascripts/hyperloop.js"></script> -->
<script src="https://npmcdn.com/tether@1.2.4/dist/js/tether.min.js"></script>
<script src="../../javascripts/bootstrap.min.js"></script>
<script src="../../javascripts/codemirror.js"></script>
<script src="../../javascripts/ruby.js"></script>
<script src="../../javascripts/matchbrackets.js"></script>
<script src="../../javascripts/react_player.js"></script>
<script src="../../javascripts/highlight.pack.js"></script>
<!-- Components are compiled by Hyperloop Express -->
<script type="text/ruby">
class CodeMirror < Hyperloop::Component
param :code, type: String
param :heading, default: "Code"
param :rows, type: Integer, default: 0
param :top_level_component, type: String
before_mount do
r=rand(2**256).to_s(36)[0..7]
@div_code = "code_#{r}"
@div_result = "result_#{r}"
end
after_mount do
# puts params.code
@editor = `CodeMirror(document.getElementById(#{@div_code}), {
value: #{params.code.to_s},
mode: 'text/x-ruby',
matchBrackets: true,
lineNumbers: false,
indentUnit: 2,
theme: 'github'
});`
`#{@editor}.on('change', #{lambda {on_change} })`
`#{@editor}.setSize(null, #{@editor}.defaultTextHeight()*#{params.rows})` unless params.rows == 0
execute_code
end
render(DIV) do
div.card {
div.card_header { params.heading }
div(id: @div_code)
div.card_header do
img(src: '../../images/hyperloop-logo-small-white.png' , width:'25')
span { ' ' }
'Live editor results'
end
div.card_block(id: @div_result)
}
end
def on_change
execute_code
end
def execute_code
begin
code = `#{@editor}.getValue()`
# puts code
code += "\nElement['##{@div_result}'].render(#{params.top_level_component})"
compiled_code = Opal::Compiler.new(code).compile
`ReactDOM.unmountComponentAtNode(document.getElementById(#{@div_result}));`
# Dispatchers and Receivers example works but Steps example breaks
# Hyperloop::Context.reset!
# `eval(#{compiled_code})`
# Hyperloop::Application::Boot.run()
# Steps example works but Dispatchers and Receivers example breaks
`eval(#{compiled_code})`
Hyperloop::Context.reset!
Hyperloop::Application::Boot.run()
component = Module.const_get params.top_level_component
# we need to see if the component is valid - try checking if it can render static markup
# the following line generates: `undefined method to_n for SimpleComponent`
# if React.render_to_static_markup( component ).empty?
# invalid_component_message
# end
rescue Exception => e
@time_out = after(0.1) do
unable_to_compile_message e.message
end
end
end
def invalid_component_message
message = div.text_danger do
h3.text_danger {"Oops, invalid Component..."}
p { "Your Component has been rejected by React. A valid Component must have a render macro and return just one HTML element." }
end
Element["##{@div_result}"].render{ message }
end
def unable_to_compile_message reason
message = div.text_danger do
h3.text_danger {"Can't compile..."}
p { reason }
end
Element["##{@div_result}"].render{ message }
end
end
</script>
<script type="text/ruby">
Document.ready? do
Element.find('div.codemirror-live-edit').each do |mount_point|
heading = mount_point.attr('data-heading')
rows = mount_point.attr('data-rows')
top_level_component = mount_point.attr('data-top-level-component')
code = Element[mount_point].find('pre').text.strip
params = {code: code, top_level_component: top_level_component}
params = params.merge({heading: heading}) if heading
params = params.merge({rows: rows.to_i}) if rows
codemirror_component = Object.const_get('CodeMirror')
React.render(React.create_element(codemirror_component, params ), mount_point)
end
end
</script>
<script type="text/ruby">
class ToggleCodemirror < Hyperloop::Component
param :code, type: String
param :heading, default: "Code"
param :rows, type: Integer, default: 0
param :top_level_component, type: String
param :show_code
before_mount do
r=rand(2**256).to_s(36)[0..7]
@div_code = "code_#{r}"
@div_result = "result_#{r}"
end
after_mount do
# puts params.code
@editor = `CodeMirror(document.getElementById(#{@div_code}), {
value: #{params.code.to_s},
mode: 'text/x-ruby',
matchBrackets: true,
lineNumbers: false,
indentUnit: 2,
readOnly: true,
theme: 'github'
});`
`#{@editor}.setSize(null, #{@editor}.defaultTextHeight()*#{params.rows})` unless params.rows == 0
Element['.codediv'].hide('')
mutate.show_code false
end
render(DIV) do
div.card {
div.card_header do
div(class: 'row') do
div(class: 'col-md-6') do
img(src: '../../images/hyperloop-logo-small-white.png' , width:'25')
span { ' ' }
span { params.heading }
end
div(class: 'col-md-6 align-right') do
toggle_link
end
end
end
div(id: @div_code, class: 'codediv')
}
end
def toggle_link
BUTTON(class: 'btn btn-info btn-sm') do
state.show_code ? "Click to hide code" : "Click to show code"
end.on(:click) do |ev|
mutate.show_code !state.show_code
state.show_code ? Element["##{@div_code}"].show('') : Element["##{@div_code}"].hide('')
end
end
end
</script>
<script type="text/ruby">
Document.ready? do
Element.find('div.togglecode').each do |mount_point|
heading = mount_point.attr('data-heading')
rows = mount_point.attr('data-rows')
top_level_component = mount_point.attr('data-top-level-component')
code = Element[mount_point].find('pre').text.strip
params = {code: code, top_level_component: top_level_component}
params = params.merge({heading: heading}) if heading
params = params.merge({rows: rows.to_i}) if rows
codemirror_component = Object.const_get('ToggleCodemirror')
React.render(React.create_element(codemirror_component, params ), mount_point)
end
end
</script>
<link href="../../stylesheets/bootstrap.min.css" rel="stylesheet" />
<link href="../../stylesheets/typography.css" rel="stylesheet" />
<link href="../../stylesheets/override.css" rel="stylesheet" />
<link href="../../stylesheets/divtable.css" rel="stylesheet" />
<!-- <link href="../../stylesheets/code.css" rel="stylesheet" /> -->
<link href="../../stylesheets/github.css" rel="stylesheet" />
<link href="../../stylesheets/highlighting.css" rel="stylesheet" />
<link href="../../stylesheets/codemirror.css" rel="stylesheet" />
<link href="../../stylesheets/monokai-sublime.css" rel="stylesheet" />
<link rel="alternate" type="application/atom+xml" title="Atom Feed" href="/feed.xml" />
<!-- Favicons -->
<link rel="apple-touch-icon" sizes="180x180" href="../../images/apple-touch-icon.png">
<link rel="icon" type="image/png" href="../../images/favicon-32x32.png" sizes="32x32">
<link rel="icon" type="image/png" href="../../images/favicon-16x16.png" sizes="16x16">
<link rel="manifest" href="/images/manifest.json">
<link rel="mask-icon" href="../../images/safari-pinned-tab.svg" color="#e81176">
<meta name="theme-color" content="#ffffff">
</head>
<body>
<div class="navbarbackgroundcolor">
<div class="container">
<nav class="navbar navbar-ligh">
<button class="navbar-toggler hidden-sm-up" type="button" data-toggle="collapse" data-target="#exCollapsingNavbar2" aria-controls="exCollapsingNavbar2" aria-expanded="false" aria-label="Toggle navigation">
☰
</button>
<div class="collapse navbar-toggleable-xs" id="exCollapsingNavbar2">
<ul class="nav navbar-nav">
<li class="nav-item">
<a href="/" class="nav-link"><span class='navfirstletter'>H</span>yperloop</a>
</li>
<li class="nav-item">
<a href="/start/components" class="nav-link active"><span class='navfirstletter'>S</span>tart</a>
</li>
<li class="nav-item">
<a href="/installation" class="nav-link"><span class='navfirstletter'>I</span>nstallation</a>
</li>
<li class="nav-item">
<a href="/tutorials" class="nav-link"><span class='navfirstletter'>T</span>utorials</a>
</li>
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<a href="/gems" class="nav-link"><span class='navfirstletter'>G</span>ems</a>
</li>
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<a href="https://github.com/ruby-hyperloop" class="nav-link"><span class='navfirstletter'>G</span>ithub</a>
</li>
<li class="nav-item">
<a href="/tools" class="nav-link"><span class='navfirstletter'>T</span>ools</a>
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<input type="text" name="search" />
</li> -->
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</div>
<div class="jumbotron page-header">
<div class="container">
<div class="row hidden-sm-down">
<div class="col-md-2">
<div class="hyperlooplogo">
</div>
</div>
<div class="col-md-8">
<h1 class="display-4 project-name">Hyperloop</h1>
<h4 class="display-7 project-tagline">
Tools for testing and debugging
</h4>
</div>
</div>
<div class="row hidden-md-up">
<div class="col-md-3">
<div class="hyperlooplogo">
</div>
</div>
<div class="col-md-9">
<h1 class="h1 project-name center-text">Hyperloop</h1>
</br>
<h2 class="h5 project-tagline center-text">
Tools for testing and debugging
</h2>
</div>
</div>
</div>
</div>
<div class="page-header-underline">
<div class="container">
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</div>
<div class="container">
<div class="row">
<div class="col-md-3 sidenavcol">
<ul class="nav">
<li class="nav-item"><a href="/tools#hyper-console">Hyper-console</a></br></li>
<li class="nav-item"><a href="/tools#hyper-spec">Hyper-spec</a></br></li>
<li class="nav-item"><a href="/tools#hyper-trace">Hyper-trace</a></br></li>
<li class="nav-item"><a href="/tools#opalhotreloader">Opal Hot Reloader</a></br></li>
<li class="nav-item"><a href="/tools#debuggingtips">Debugging tips</a></br></li>
</ul>
<div class="getstarted">
<br>
<hr>
<p>NEWS: RubyHyperloop is to be renamed Hyperstack. Come and see the work-in-progress site: </p>
<!-- <button type="button" class="btn btn-primary btn-lg btn-hyperlooppink" onclick="https://hyperstack.org';">https://hyperstack.org</button> -->
<a href='https://hyperstack.org'>https://hyperstack.org</a>
</div>
<br>
</div>
<div class="col-md-9 main-content">
<h1><div class="chaptertitle"><span class="bigfirstletter">D</span>ebugging tips</div>
</h1>
<h3 id="javascript-console">JavaScript Console</h3>
<p>At any time during program execution you can breakout into the JavaScript console by simply adding a line of back-ticked JavaScript to your ruby code:</p>
<pre class="highlight ruby"><code><span class="sb">`debugger;`</span>
</code></pre>
<p>If you have source maps turned on you will then be able to see your ruby code (and the compiled JavaScript code) and set browser breakpoints, examine values and continue execution. See <a href="http://opalrb.com/docs/guides/v0.10.1/source_maps.html">Opal Source Maps</a> if you are not seeing source maps.</p>
<p>You can also inspect ruby objects from the JavaScript console. <a href="http://dev.mikamai.com/post/103047475349/3-tricks-to-debug-opal-code-from-your-browser">Here are three tricks</a>.</p>
<h3 id="puts-is-your-friend">Puts is your friend</h3>
<p>Anywhere in your HyperReact code you can simply <code>puts any_value</code> which will display the contents of the value in the browser console. This can help you understand React program flow as well as how data changes over time.</p>
<pre class="highlight ruby"><code><span class="k">class</span> <span class="nc">Thing</span> <span class="o"><</span> <span class="no">Hyperloop</span><span class="o">::</span><span class="no">Component</span>
<span class="n">param</span> <span class="ss">initial_mode: </span><span class="mi">12</span>
<span class="n">before_mount</span> <span class="k">do</span>
<span class="n">state</span><span class="p">.</span><span class="nf">mode!</span> <span class="n">params</span><span class="p">.</span><span class="nf">initial_mode</span>
<span class="nb">puts</span> <span class="s2">"before_mount params.initial_mode=</span><span class="si">#{</span><span class="n">params</span><span class="p">.</span><span class="nf">initial_mode</span><span class="si">}</span><span class="s2">"</span>
<span class="k">end</span>
<span class="n">after_mount</span> <span class="k">do</span>
<span class="vi">@timer</span> <span class="o">=</span> <span class="n">every</span><span class="p">(</span><span class="mi">60</span><span class="p">)</span> <span class="p">{</span> <span class="n">force_update!</span> <span class="p">}</span>
<span class="nb">puts</span> <span class="s2">"after_mount params.initial_mode=</span><span class="si">#{</span><span class="n">params</span><span class="p">.</span><span class="nf">initial_mode</span><span class="si">}</span><span class="s2">"</span>
<span class="k">end</span>
<span class="n">render</span> <span class="k">do</span>
<span class="n">div</span><span class="p">(</span><span class="ss">class: :time</span><span class="p">)</span> <span class="k">do</span>
<span class="nb">puts</span> <span class="s2">"render params.initial_mode=</span><span class="si">#{</span><span class="n">params</span><span class="p">.</span><span class="nf">initial_mode</span><span class="si">}</span><span class="s2">"</span>
<span class="nb">puts</span> <span class="s2">"render state.mode=</span><span class="si">#{</span><span class="n">state</span><span class="p">.</span><span class="nf">mode</span><span class="si">}</span><span class="s2">"</span>
<span class="p">.</span><span class="nf">.</span><span class="p">.</span>
<span class="nf">end</span><span class="p">.</span><span class="nf">on</span><span class="p">(</span><span class="ss">:change</span><span class="p">)</span> <span class="k">do</span> <span class="o">|</span><span class="n">e</span><span class="o">|</span>
<span class="n">state</span><span class="p">.</span><span class="nf">mode!</span><span class="p">(</span><span class="n">e</span><span class="p">.</span><span class="nf">target</span><span class="p">.</span><span class="nf">value</span><span class="p">.</span><span class="nf">to_i</span><span class="p">)</span>
<span class="nb">puts</span> <span class="s2">"on:change e.target.value.to_i=</span><span class="si">#{</span><span class="n">e</span><span class="p">.</span><span class="nf">target</span><span class="p">.</span><span class="nf">value</span><span class="p">.</span><span class="nf">to_i</span><span class="si">}</span><span class="s2">"</span>
<span class="nb">puts</span> <span class="s2">"on:change (too high) state.mode=</span><span class="si">#{</span><span class="n">state</span><span class="p">.</span><span class="nf">mode</span><span class="si">}</span><span class="s2">"</span> <span class="k">if</span> <span class="n">state</span><span class="p">.</span><span class="nf">mode</span> <span class="o">></span> <span class="mi">100</span>
<span class="k">end</span>
<span class="k">end</span>
<span class="k">end</span>
<span class="k">end</span>
</code></pre>
</div>
</div>
</div>
<div class="page-footer-upperline">
<div class="container">
</div>
</div>
<footer class="nav-footer">
<section class="sitemap">
<a href="/" class="nav-home"></a>
<div>
<h6><a href="/start/components" class="hyperloop-white">Start</a></h6>
<a href="/start/components">Components</a>
<a href="/start/stores">Stores</a>
<a href="/start/models">Models</a>
<a href="/start/operations">Operations</a>
<a href="/start/policies">Policies</a>
<a href="/start/pragmatic">Pragmatic Thinking</a>
</div>
<div>
<h6><a href="/tutorials" class="hyperloop-white">Tutorials</a></h6>
<a href="/tutorials/hyperloopcomps">Hyperloop COMPS</a>
<a href="/tutorials/hyperloopjs">Hyperloop.js</a>
<a href="/tutorials/hyperlooprails">Hyperloop and Rails</a>
<a href="/tutorials/hyperloopdeploy">Hyperloop deployment</a>
<a href="/tutorials/opal">Opal</a>
<a href="/tutorials/videos">Videos</a>
</div>
<div>
<h6><a href="/installation" class="hyperloop-white">Installation</a></h6>
<a href="/installation#opal-playground">Hyperloop.js</a>
<a href="/installation#ror">With Ruby On Rails</a>
<a href="/installation#with-sinatra">With Sinatra</a>
<a href="/installation#deployment">Deployment</a>
</div>
<div>
<h6><a href="/gems" class="hyperloop-white">Gems</a></h6>
<a href="https://github.com/ruby-hyperloop/hyperloop">hyperloop</a>
<a href="https://github.com/ruby-hyperloop/hyperloop-js">hyperloop-js</a>
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