LLC-JavaScript/js_debugging.html at master · pearlchen/LLC-JavaScript · GitHub

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<!DOCTYPE html>
<html>
<head>
<metacharset="utf-8">
<title>Ladies Learning Code - JavaScript March 18, 2012</title>
<metaname="viewport" content="width=1280">

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<body>CODE</body>
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<articleclass='slide slide-subhead'>
<h1>Going Beyond JavaScript Basics</h1>
<p>You're getting to be quite the pro!</p>
</article>

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<articleclass='slide slide-subhead'>
<h1>Debugging!</h1>
<p>Squash those crawly things in your code.</p>
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<h2>What's a Bug?</h2>
<p>As <ahref="http://en.wikipedia.org/wiki/Grace_Hopper#Anecdotes" target="_blank">the story</a> goes, the term &quot;software bug&quot; got its name because a real moth flew into a computer system causing strange, unexpected behaviours to happen in a computer program. </p>
<p>Nowadays, bugs are mostly due to human error in one of two areas:</p>
<ol>
<li>
 Syntax - missing semi-colons, typos, case-sensitivity</li>
<li>
 Logic - trying to access a variable that doesn't exist yet, writing an incorrect conditional test</li></ol>
<p>Luckily there's a few things to help us hunt them down quicker...</p>
</article>

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<h2>Chrome Developer Console</h2>
<p>Use the built in developer tools in Chrome to debug your code. (Firefox+Firebug is similar but not exactly the same.)</p>
<p>[Wrench Icon] &gt; Tools &gt; Developer Tools ( Alt+Cmd+L for Mac, Ctrl+L for Windows) Click on the Console tab.</p>
<p><imgsrc="assets/ChromeConsole.gif" width="632" height="84" alt="Chrome debugger tabs" /></p>
</article>

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<h2>Right click &gt; Inspect Element</h2>
<p>Easiest way to remember is to right-click on any web page and select "Inspect Element". In the new panel, select the "Console" tab to see JavaScript errors or to play in the console sandbox.</p>
<p><imgsrc="assets/ChromeInspector.gif" width="243" height="248" alt="Right click to see Inspect Element in the popup" /></p>
</article>

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<h2>Inspecting the DOM</h2>
<p>You can inspect any webpage with the debugger. </p>
<p>Let's open up the Ladies Learning Code Events page: <ahref="http://ladieslearningcode.com/events/" target="_blank">http://ladieslearningcode.com/events/</a>.</p>
<p>How can we use the console to find out how many events are listed on this page?</p>
</article>

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<h2>More info</h2>
<ul>
<li><ahref="https://developers.google.com/chrome-developer-tools/docs/overview" target="_blank">Chrome Developer Tools: Overview</a></li>
<li>Video: <ahref="http://www.youtube.com/watch?v=N8SS-rUEZPg" target="_blank">Google I/O 2011: Chrome Dev Tools Reloaded</a></li>
<li>Video: <ahref="https://www.youtube.com/watch?v=3pxf3Ju2row" target="_blank">Google I/O 2012 - Chrome Developer Tools Evolution</a></li>
</ul>
</article>

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