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<!DOCTYPE html>
<html lang="en">
<head>
<title>GDI Mpls - Intermediate JavaScript</title>
<link href='http://fonts.googleapis.com/css?family=Ubuntu+Mono:400,400italic' rel='stylesheet' type='text/css'>
<link rel="stylesheet" type="text/css" href="css/font-awesome.min.css">
<link rel="stylesheet" type="text/css" href="css/reveal.css">
<link rel="stylesheet" type="text/css" href="prism/prism.css">
<link rel="stylesheet" type="text/css" href="css/styles.css">
<script type="text/javascript" src="js/jquery-1.11.2.min.js"></script>
<script type="text/javascript" src="js/reveal.js"></script>
<script type="text/javascript" src="prism/prism.js"></script>
<script type="text/javascript" src="js/scripts.js"></script>
<link rel="icon" type="image/x-icon" href="favicon.ico">
</head>
<body>
<div class="reveal" id="gdi">
<div class="slides">
<!-- - - - - - - - - - - - - - - - - - - - - - - - -->
<!-- Introduction -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - -->
<section>
<h3 class="uppercase no_margin">Intermediate JavaScript</h3>
<div class="meta blue uppercase small_meta">06.11.18 ∙ GDI MPLS ∙ Amy Gebhardt</div>
<img src="img/gdi_logo_badge.png" class="top_margin width_50" style="width:30%;">
<div class="spacer"></div>
<div class="left_align" style="margin-top:-120px;">
<div class="meta white big_meta uppercase tiny_meta">Wifi</div>
<div class="meta gold tiny_meta">Network:
<span class="white">training</span>
</div>
<div class="meta gold tiny_meta">Password:
<span class="white">classroom</span>
</div>
<div class="meta gold tiny_meta">Slides:
<span class="white">https://gdiminneapolis.github.io/intermediate-js/class-two.html</span>
</div>
<div class="meta gold tiny_meta">Project Files:
<span class="white">https://tinyurl.com/yd9bo3y6</span>
</div>
</div>
</section>
<section class="left_align">
<h3 class="uppercase no_margin gold">Welcome Back!</h3>
</section>
<section>
<h3 class="no_margin navy">You belong here.</h3>
</section>
<section class="left_align">
<h3 class="uppercase no_margin white">Expectations</h3>
<div class="spacer big_spacer"></div>
<div class="fragment meta pink small_meta">Review <span class="fragment meta white tiny_meta">(today!)</span></div>
<div class="spacer small_spacer"></div>
<div class="fragment meta pink small_meta">Vanilla JavaScript is ugly <span class="fragment meta white tiny_meta">(today!)</span></div>
<div class="spacer small_spacer"></div>
<div class="fragment meta pink small_meta">Define library and framework <span class="fragment meta white tiny_meta">(today!)</span></div>
<div class="spacer small_spacer"></div>
<div class="fragment meta pink small_meta">Learn how to research, implement, and use a library <span class="fragment meta white tiny_meta">(today!)</span></div>
<div class="spacer small_spacer"></div>
<div class="fragment meta pink small_meta">Hear what the "cool" kids are using these days <span class="fragment meta white tiny_meta">(today!)</span></div>
<div class="spacer small_spacer"></div>
<div class="fragment meta pink small_meta">Do some cool stuff with jQuery</div>
<div class="spacer small_spacer"></div>
</section>
<section>
<h3 class="uppercase no_margin navy">get excited.</h3>
<div class="spacer small_spacer"></div>
<img src="img/excited.gif">
</section>
<!-- - - - - - - - - - - - - - - - - - - - - - - - -->
<!-- Review - Deep Dive (counter) CONTINUED -->
<!-- - - - - - - - - - - - - - - - - - - - - - - - -->
<section>
<div id="ddr">
<div id="result">0</div>
<button id="ddr_subtract">-</button>
<button id="ddr_add">+</button>
</div>
</section>
<section>
<h4 class="no_margin blue">How does it look?</h4>
<div class="fragment white meta small_meta">How about your code?</div>
</section>
<section>
<h4 class="no_margin blue">Refactoring</h4>
<div class="white meta">
"Code refactoring is the process of restructuring existing computer code – changing the factoring – without changing its
external behavior."
</div>
<div class="spacer big_spacer"></div>
<div class="meta gold">
Readability, maintainability, less room for error.
</div>
</section>
<section>
<h4 class="no_margin blue">Refactor your counter</h4>
<div class="spacer big_spacer"></div>
<div class="fragment meta white small_meta">
Use a different
<span class="gold">selector</span> to get both buttons into an
<span class="inline_code">array</span>.
</div>
<hr />
<div class="fragment meta white small_meta">
Using a
<span class="inline_code">for</span>
<span class="gold">loop</span>, step through each button and add the
<span class="gold">click event listener</span> it. When clicked, update the
<span class="inline_code">HTML</span> and the
<span class="gold">class</span> for the
<span class="inline_code">result</span> element.
</div>
<hr />
<div class="fragment meta white small_meta">
There should only be
<span class="inline_code">addEventListener()</span> in your code.
</div>
</section>
<section>
<div class="meta white tiny_meta task_quote">
Use a different
<span class="gold">selector</span> to get both buttons into an
<span class="inline_code">array</span>.
</div>
<div class="spacer big_spacer"></div>
<div class="spacer big_spacer"></div>
<div class="fragment meta white small_meta">
Instead of using
<span class="inline_code">getElementById()</span> for the
<span class="inline_code">add</span>
and
<span class="inline_code">subtract</span> buttons, you can use
<span class="inline_code">getElementsByTagName()</span>.
</div>
<div class="fragment" style="height:95px;">
<pre class="language-markup" data-src="src_samples/get_elements_by_tag_name.js"></pre>
<div style="clear:both;"></div>
</div>
<div class="fragment meta white small_meta">
<span class="inline_code">buttons</span> is now an
<span class="gold">array</span> of
<span class="gold">elements</span>.
</div>
</section>
<section>
<div class="meta white tiny_meta task_quote">
Using a
<span class="inline_code">for</span>
<span class="gold">loop</span>, step through each button and add the
<span class="gold">click event listener</span> it. When clicked, update the
<span class="inline_code">HTML</span> and the
<span class="gold">class</span> for the
<span class="inline_code">result</span> element.
</div>
<div class="spacer big_spacer"></div>
<div class="spacer big_spacer"></div>
<div class="fragment meta white small_meta">
Set up the
<span class="inline_code">for</span>
<span class="gold">loop</span> and set the
<span class="gold">break condition</span>
to be the
<span class="inline_code">length</span> of the
<span class="inline_code">buttons</span> array.
</div>
<div class="fragment" style="height:175px;">
<pre class="language-markup" data-src="src_samples/set_up_for_loop.js"></pre>
<div style="clear:both;"></div>
</div>
</section>
<section>
<div class="meta white tiny_meta task_quote">
Using a
<span class="inline_code">for</span>
<span class="gold">loop</span>, step through each button and add the
<span class="gold">click event listener</span> it. When clicked, update the
<span class="inline_code">HTML</span> and the
<span class="gold">class</span> for the
<span class="inline_code">result</span> element.
</div>
<div class="spacer big_spacer"></div>
<div class="spacer big_spacer"></div>
<div class="fragment meta white small_meta">
Store the "current" button on each
<span class="gold">iteration</span> of the
<br />loop using
<span class="gold">bracket notation</span>.
</div>
<div class="fragment" style="height:155px;">
<pre class="language-markup" data-src="src_samples/for_loop_save_btn.js"></pre>
<div style="clear:both;"></div>
</div>
</section>
<section>
<div class="meta white tiny_meta task_quote">
Using a
<span class="inline_code">for</span>
<span class="gold">loop</span>, step through each button and add the
<span class="gold">click event listener</span> it. When clicked, update the
<span class="inline_code">HTML</span> and the
<span class="gold">class</span> for the
<span class="inline_code">result</span> element.
</div>
<div class="spacer big_spacer"></div>
<div class="spacer big_spacer"></div>
<div class="fragment meta white small_meta">
Add the
<span class="gold">event listener</span> for the current button.
</div>
<div class="fragment" style="height:255px;">
<pre class="language-markup" data-src="src_samples/for_loop_with_event_listener.js"></pre>
<div style="clear:both;"></div>
</div>
</section>
<section>
<div class="meta white tiny_meta task_quote">
Using a
<span class="inline_code">for</span>
<span class="gold">loop</span>, step through each button and add the
<span class="gold">click event listener</span> it. When clicked, update the
<span class="inline_code">HTML</span> and the
<span class="gold">class</span> for the
<span class="inline_code">result</span> element.
</div>
<div class="spacer big_spacer"></div>
<div class="spacer big_spacer"></div>
<div class="fragment meta white small_meta">
To determine if we should
<span class="gold">add</span> or
<span class="gold">subtract</span> 1 from the result, we'll need to get at the current button's
<span class="inline_code">innerHTML</span>. We need to do this with the
<span class="inline_code">this</span> keyword.
</div>
<div class="fragment skinny_pre" style="height:205px;">
<pre class="language-markup" data-src="src_samples/button_inner_html.js"></pre>
<div style="clear:both;"></div>
</div>
</section>
<section>
<div class="meta white tiny_meta task_quote">
Using a
<span class="inline_code">for</span>
<span class="gold">loop</span>, step through each button and add the
<span class="gold">click event listener</span> it. When clicked, update the
<span class="inline_code">HTML</span> and the
<span class="gold">class</span> for the
<span class="inline_code">result</span> element.
</div>
<div class="spacer big_spacer"></div>
<div class="spacer big_spacer"></div>
<div class="fragment meta white small_meta">
There are a few different ways to go forward. You could use a
<span class="gold">conditional statement</span> to add or subtract 1.
<br />
<br /> You could also use the +/-
<span class="gold">string</span> and convert it to an
<span class="gold">interger</span>
since JavaScript will keep track of the sign. That way, you could always add the value.
</div>
</section>
<section>
<div class="white meta big_meta">
<span class="gold">Option #1:</span> Use conditional statements</div>
<div class="fragment" style="height:665px;">
<pre class="language-markup" data-src="src_samples/for_loop_operations.js"></pre>
<div style="clear:both;"></div>
</div>
</section>
<section>
<div class="white meta big_meta">
<span class="gold">Option #2:</span> Use the string & always add</div>
<div class="fragment" style="height:605px;">
<pre class="language-markup" data-src="src_samples/for_loop_operations_second_option.js"></pre>
<div style="clear:both;"></div>
</div>
</section>
<section>
<div class="white meta big_meta">
<span class="gold">Option #3:</span> ??</div>
</section>
<section>
<div class="meta white tiny_meta task_quote">
Using a
<span class="inline_code">for</span>
<span class="gold">loop</span>, step through each button and add the
<span class="gold">click event listener</span> it. When clicked, update the
<span class="inline_code">HTML</span> and the
<span class="gold">class</span> for the
<span class="inline_code">result</span> element.
</div>
<div class="spacer big_spacer"></div>
<div class="spacer big_spacer"></div>
<div class="fragment meta white small_meta">
Finally, update the
<span class="gold">class</span> just as we did before.
</div>
<div class="fragment skinny_pre" style="height:325px;">
<pre class="language-markup" data-src="src_samples/for_loop_add_class.js"></pre>
<div style="clear:both;"></div>
</div>
</section>
<section>
<h4 class="no_margin blue">Save and test.
<br />Is everything still working as it did?</h4>
<div class="spacer"></div>
<img src="img/refactormeme.jpg" class="fragment">
</section>
<section>
<h2 class="blue">Ready for a break?</h2>
</section>
<section>
<h2 class="white">Even though we've refactored, JavaScript can still be kind of ugly.</h2>
<div class="spacer"></div>
<div class="blue fragment meta small_meta">
In the world of programming, developers are always trying to find ways to make writing code easier and prettier.
</div>
</section>
<section>
<div class="fragment kind_of_skinny_pre no_margin_pre" style="height:605px;">
<pre class="language-markup" data-src="src_samples/jquery_tease.js"></pre>
<div style="clear:both;"></div>
</div>
</section>
<section>
<h2>JavaScript Libraries & Frameworks</h2>
</section>
<section class="left_align">
<h2 class="gold">A JavaScript library is...</h2>
<h3>a package of pre-written JavaScript that allows for easier development.</h3>
<div class="spacer"></div>
<div class="blue fragment meta big_meta">Easier, cleaner code.</div>
<div class="blue fragment meta big_meta">Avoid re-inventing the wheel.</div>
<div class="blue fragment meta big_meta">Get away from tricky "vanilla" JS.</div>
<div class="blue fragment meta big_meta">Be consistent with standards.</div>
</section>
<section class="left_align">
<h2 class="gold">A JavaScript framework is...</h2>
<h3>a package of pre-written JavaScript that allows for easier development.</h3>
<div class="spacer"></div>
<div class="blue fragment meta big_meta">Easier, cleaner code.</div>
<div class="blue fragment meta big_meta">Avoid re-inventing the wheel.</div>
<div class="blue fragment meta big_meta">Get away from tricky "vanilla" JS.</div>
<div class="blue fragment meta big_meta">Be consistent with standards.</div>
</section>
<section class="left_align">
<h2 class="gold">Frameworks are a lifestyle.</h2>
<div class="white fragment meta big_meta">Tend to be more about standards/consistency.</div>
<div class="white fragment meta big_meta">About methodologies, philosophies, & code structure.</div>
<h2 class="gold">Libraries are a collection of tools.</h2>
<div class="white fragment meta big_meta">Tend to be more about plugins, features, etc.</div>
<div class="white fragment meta big_meta">About providing tools without all the rules.</div>
</section>
<section>
<img src="img/potato.gif" style="width: 40%;">
</section>
<section>
<img src="img/potato-code.jpg" style="width: 70%;">
</section>
<section>
<h2 class="gold">Be prepared:</h2>
<h2 class="white">You'll see blogs, developers, even companies use these terms differently.</h2>
</section>
<section>
<h2 class="gold">Popular Libraries:</h2>
<div class="spacer"></div>
<div class="img_wrapper">
<img class="fragment" src="img/jquery.png">
<img class="fragment" src="img/jqueryui.png">
<img class="fragment" src="img/momentjs.jpeg">
<img class="fragment" src="img/chartjs.jpeg">
<img class="fragment" src="img/mootools.png">
</div>
</section>
<section>
<h2 class="gold">Popular Frameworks:</h2>
<div class="spacer"></div>
<div class="img_wrapper">
<img class="fragment img_50" src="img/angular.jpeg">
<img class="fragment img_50" src="img/backbone.jpeg">
<img class="fragment img_20" src="img/ember.png">
<img class="fragment img_50" src="img/ionic.jpg">
<img class="fragment img_50" src="img/react.png">
</div>
</section>
<section>
<h2 class="white">JavaScript libraries and frameworks live in separate <span class="inline_code">.js</span> files.</h2>
<div class="spacer"></div>
<div class="blue meta">You include these in your own project directory and then you can use them!</div>
</section>
<section>
<h4 class="no_margin gold">Let's try it!</h4>
<span class="spacer"></span>
<div class="fragment meta white small_meta">
Browse to http://momentjs.com/ and download <span class="inline_code">moment.min.js</span>.<br />
<div class="spacer"></div>
<img src="img/momentdownload.png">
</div>
<hr />
<div class="fragment meta white small_meta">
Move the <span class="inline_code">moment.min.js</span> file to your project's <span class="inline_code">lib</span> directory.
</div>
<hr />
<div class="fragment meta white small_meta">
Create a new file in the <span class="inline_code">intermediate-js-project-files</span> directory.
</div>
<hr />
<div class="fragment meta white small_meta">
Save as <span class="inline_code">workingWithMoment.js</span>.
</div>
</section>
<section>
<div class="fragment meta white small_meta">
In <span class="inline_code">index.html</span>, update the <span class="inline_code">src</span> attribute
of your <span class="inline_code"><script></span> tag and then add a new one for <span class="inline_code">moment.min.js</span>.
</div>
<div class="fragment" style="height:265px;">
<pre class="language-markup" data-src="src_samples/include_moment.html"></pre>
<div style="clear:both;"></div>
</div>
<div class="fragment meta white small_meta">
Now your page knows about <span class="inline_code">moment</span>!
</div>
</section>
<section>
<h4 class="no_margin gold">Let's try it!</h4>
<div class="spacer"></div>
<div class="fragment meta white small_meta">
Using the new <span class="gold">library</span>, have your page display your age.
</div>
<hr />
<div class="fragment meta white small_meta">
Use <span class="inline_code">fromNow()</span> method shown on the MomentJS front page.
</div>
<hr />
<div class="fragment meta white small_meta">
Part of using libraries and frameworks is learning how to follow their documentation.
</div>
</section>
<section class="left_align">
<h4 class="no_margin gold">Installing libraries/frameworks</h4>
<div class="meta gold big_meta">for your project</div>
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1) Download & save in your project directory.
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(GitHub, website, etc)
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2) Use a CDN.
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(content delivery network; allow someone else - like Google - to host)
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3) Use a package manager.
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(<a href="https://yarnpkg.com/lang/en/">yarn</a>, <a href="https://www.npmjs.com/">npm</a>, <a href="https://bower.io/">bower</a>, etc)
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<h2 class="blue uppercase">Thanks for coming</h2>
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See you next week!
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Have feedback you'd like to share before next week? Let us know!
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