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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Class 2 ~ Javascript ~ Girl Develop IT</title>
<meta name="description" content="This is the official Girl Develop It Core Intro Javascript course. Material based on original material by Sara Chipps, Pamela Fox, Alexis Goldstein, Izzy Johnston and Leo Newball.
The course is meant to be taught in 4 two-hour sections. Each of the slides and practice files are customizable according to the needs of a given class or audience.">
<meta name="author" content="Girl Develop It">
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
<link rel="stylesheet" href="reveal/css/reveal.css">
<link rel="stylesheet" href="reveal/css/theme/gdidefault.css" id="theme">
<!-- For syntax highlighting -->
<!-- light editor<link rel="stylesheet" href="lib/css/light.css">-->
<!-- dark editor--><link rel="stylesheet" href="reveal/lib/css/dark.css">
<!-- If use the PDF print sheet so students can print slides-->
<link rel="stylesheet" href="reveal/css/print/pdf.css" type="text/css" media="print">
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<!-- Opening slide -->
<section>
<img src = "images/gdi_logo_badge.png">
<h3>Beginning Javascript</h3>
<h4>Class 2</h4>
</section>
<!-- Welcome-->
<section>
<h3>Welcome!</h3>
<div class = "left-align">
<p>Girl Develop It is here to provide affordable and accessible programs to learn software through mentorship and hands-on instruction.</p>
<p class ="green">Some "rules"</p>
<ul>
<li>We are here for you!</li>
<li>Every question is important</li>
<li>Help each other</li>
<li>Have fun</li>
</ul>
</div>
</section>
<!-- Loops-->
<section>
<h3>Loops</h3>
<p>Sometimes you want to go through a piece of code multiple times</p>
<p class = "fragment">Why?</p>
<ul>
<li class = "fragment">Showing a timer count down</li>
<li class = "fragment">Displaying the results of a search</li>
<li class = "fragment">Adding images to a slideshow</li>
</ul>
</section>
<section>
<h3>The while loop</h3>
<p>The while loop tells JS to repeat statements while a condition is true:</p>
<pre><code contenteditable class = "javascript">
while (expression) {
// statements to repeat
}
</code></pre>
<pre><code contenteditable class = "javascript">
var x = 0;
while (x < 5) {
console.log(x);
x++;
}
</code></pre>
<div class = "fragment">
Review: '++' means increment by 1!
</div>
<div class = "fragment">
<div class = "yellow">Danger!!</div>
<p>What happens if we forget x++;?</p>
<p>The loop will never end!!</p>
</div>
</section>
<section>
<h3>The for loop</h3>
<p>The for loop is a safer way of looping</p>
<pre><code contenteditable class = "javascript">
for (initialize; condition; update) {
// statements to repeat
}
</code></pre>
<pre><code contenteditable class = "javascript">
for (var i = 0; i < 5; i++) {
console.log(i);
}
</code></pre>
<div class = "fragment">
Less danger of an infinite loop. All conditions are at the top!
</div>
</section>
<!-- Arrays -->
<section>
<h3>Array</h3>
<p>An array is a data-type that holds an ordered list of values, of any type:</p>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
var arrayName = [element0, element1, ...];
</code></pre>
</div>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green', 'Blue', 'Indigo', 'Violet'];
var favoriteNumbers = [16, 27, 88];
var luckyThings = ['Rainbows', 7, 'Horseshoes'];
</code></pre>
</div>
<div class = "fragment">
The length property reports the size of the array:
<pre><code contenteditable class = "javascript">
console.log(rainbowColors.length);
</code></pre>
</div>
</section>
<section>
<h3>Arrays -- returning values</h3>
<p class = "fragment">You can access items with "bracket notation".</p>
<div class = "fragment">
The number inside the brackets is called an "index"
<pre><code contenteditable class = "javascript">
var arrayItem = arrayName[indexNum];
</code></pre>
</div>
<div class = "fragment">
Arrays in JavaScript are "zero-indexed", which means we start counting from zero.
<pre><code contenteditable class = "javascript">
var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green', 'Blue', 'Indigo', 'Violet'];
var firstColor = rainbowColors[0];
var lastColor = rainbowColors[6];
</code></pre>
</div>
</section>
<section>
<h3>Arrays -- updating values</h3>
<div class = "fragment">
You can also use bracket notation to change the item in an array:
<pre><code contenteditable class = "javascript">
var awesomeAnimals = ['Corgis', 'Otters', 'Octopi'];
awesomeAnimals[0] = 'Bunnies';
</code></pre>
</div>
<div class = "fragment">
Or to add to an array:
<pre><code contenteditable class = "javascript">
awesomeAnimals[4] = 'Corgis';
</code></pre>
</div>
<div class = "fragment">
You can also use the push method:
<pre><code contenteditable class = "javascript">
awesomeAnimals.push('Ocelots');
</code></pre>
</div>
</section>
<section>
<h3>Loops and Arrays</h3>
Use a for loop to easily look at each item in an array:
<pre><code contenteditable class = "javascript">
var rainbowColors = ['Red', 'Orange', 'Yellow', 'Green', 'Blue', 'Indigo', 'Violet'];
for (var i = 0; i < rainbowColors.length; i++) {
console.log(rainbowColors[i]);
}
</code></pre>
</section>
<!-- Exercise -->
<section>
<h3>Let's Develop It</h3>
<ul>
<li>Add a new link to the exercise from last week</li>
<li>Add an onclick to the link for a function called favoriteThings()</li>
<li>Create a new function called favoriteThings() in the javascript file</li>
<li>In the function, create an array and loop through the results</li>
<li>Post the results in an alert "My favorite things are XX, YY, ZZ'</li>
<li>Bonus -- add an 'and' in the sentence before the last item</li>
</ul>
</section>
<!-- Objects-->
<section>
<h3>Objects</h3>
<p>Objects are a data type that let us store a collection of properties and methods.</p>
<pre><code contenteditable class = "javascript">
var objectName = {
propertyName: propertyValue,
propertyName: propertyValue,
...
};
</code></pre>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
var charlie = {
age: 8,
name: "Charlie Brown",
likes: ["baseball", "The little red-haired girl"],
pet: "Snoopy"
};
</code></pre>
</div>
</section>
<section>
<h3>Objects -- returning values</h3>
<p>Access values of "properties" using "dot notation":</p>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
var charlie = {
age: 8,
name: "Charlie Brown",
likes: ["baseball", "The little red-haired girl"],
pet: "Snoopy"
};
</code></pre>
</div>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
var pet = charlie.pet;
</code></pre>
</div>
</section>
<section>
<h3>Objects -- returning values</h3>
<div class = "fragment">
Or using "bracket notation" (like arrays):
<pre><code contenteditable class = "javascript">
var name = charlie['name'];
</code></pre>
</div>
<div class = "fragment">
Non-existent properties will return undefined:
<pre><code contenteditable class = "javascript">
var gender = charlie.gender
</code></pre>
</div>
</section>
<section>
<h3>Objects -- changing values</h3>
<p>Use dot or bracket notation with the assignment operator to change objects.</p>
<div class = "fragment">
Change existing properties:
<pre><code contenteditable class = "javascript">
charlie.name = "Chuck";
</code></pre>
</div>
<div class = "fragment">
Or add new properties:
<pre><code contenteditable class = "javascript">
charlie.gender = "male";
</code></pre>
</div>
<div class ="fragment">
You can also delete properties:
<pre><code contenteditable class = "javascript">
delete charlie.gender;
</code></pre>
</div>
</section>
<section>
<h3>Arrays of Objects</h3>
<p>Arrays can hold objects too!</p>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
var peanuts = [
{name: "Charlie Brown",
pet: "Snoopy"},
{name: "Linus van Pelt",
pet: "Blue Blanket"}
];
</code></pre>
</div>
<div class = "fragment">
That means we can use a for loop!
<pre><code contenteditable class = "javascript">
for (var i = 0; i < peanuts.length; i++) {
var peanut = peanuts[i];
console.log(peanut.name + ' has a pet named ' + peanut.pet + '.');
}
</code></pre>
</div>
</section>
<section>
<h3>Objects in functions</h3>
<p>You can pass an object into a function as a parameter</p>
<pre><code contenteditable class = "javascript">
var peanut ={
name: "Charlie Brown",
pet: "Snoopy"
};
</code></pre>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
function describeCharacter(character){
console.log(character.name + ' has a pet named ' + character.pet + '.');
}
</code></pre>
</div>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
describeCharacter(peanut);
</code></pre>
</div>
</section>
<!-- Exercise -->
<section>
<h3>Let's Develop It</h3>
<ul>
<li>Add another link that calls the function myFriends() onclick</li>
<li>Add a new function to the javascript myFriends</li>
<li>In the function, create an array of friends objects, with their names and hair colors</li>
<li>Use a for loop to go through each friend and describe them</li>
<li>Alert the results</li>
<li>Bonus -- make a separate functions that describe the friends</li>
</ul>
</section>
<!-- DOM -->
<section>
<h3>DOM</h3>
<ul>
<li class = "fragment">"Document Object Model"</li>
<li class = "fragment">A way to interact with the HTML elements on a webpage</li>
<li class = "fragment">Chrome and Firefox -- Right click --> Inspect Element</li>
</ul>
<img src = "images/dom.png" class = "fragment">
</section>
<section>
<h3>DOM Interaction</h3>
<p class = "fragment">On every webpage, the document object gives us ways of accessing and changing the DOM.</p>
<p class = "fragment left-align">Every DOM "node" has properties. They are connected like a family tree.</p>
<p class = "fragment left-align"> Parent (parentNode), children (childNodes, firstChild), siblings (prevSibling, nextSibling)</p>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
var bodyNode = document.body; // <body>
var htmlNode = document.body.parentNode; // <html>
for (var i = 0; i < document.body.childNodes.length; i++) {
var childNode = document.body.childNodes[i];
//could be <p>, <h1>, etc.
//any html element
}
</code></pre>
</div>
</section>
<section>
<h3>DOM Interaction: Easier</h3>
<p class = "fragment blue">Finding every element on the page by siblings and children is time consuming!</p>
<p class = "fragment">The document object also provides methods for finding DOM nodes without going one by one</p>
<div class = "fragment">
Find element by id
<pre><code contenteditable class = "html">
<img id="mainpicture" src="http://girldevelopit.com/assets/pink-logo.png">
</code></pre>
<pre><code contenteditable class = "javascript">
var img = document.getElementById('mainpicture');
</code></pre>
</div>
</section>
<section>
<h3>DOM Interaction: Easier</h3>
<div class = "fragment">
Find element by tag name (p, li, div, etc.)
<pre><code contenteditable class = "html">
<li class="peanut">Charlie Brown</li>
<li class="peanut">Linus van Pelt</li>
</code></pre>
<pre><code contenteditable class = "javascript">
var listItems = document.getElementsByTagName('li');
for (var i =0; i < listItems.length; i++) {
var listItem = listItems[i];
}
</code></pre>
</div>
</section>
<!-- Methods-->
<section>
<h3>Methods</h3>
<ul>
<li class = "fragment">Methods are functions that are associated with an object</li>
<li class = "fragment">The affect or return a value for a specific object</li>
<li class = "fragment">Used with dot notation</li>
</ul>
<div class = "fragment">
Previously seen example:
<pre><code contenteditable class = "javascript">
var img = document.getElementById('mainpicture');
</code></pre>
</div>
</section>
<!-- Attributes-->
<section>
<h3>DOM Nodes -- Attributes</h3>
<p>We can use node methods to set and retrieve attributes</p>
<div class = "fragment">
getAttribute/setAttribute
<pre><code contenteditable class = "javascript">
var img = document.getElementById('mainpicture');
img.getAttribute('src');
img.setAttribute('src', 'http://girldevelopit.com/assets/pink-logo.png');
</code></pre>
<pre><code contenteditable class = "javascript">
var img = document.getElementById('mainpicture');
img.getAttribute('class');
img.setAttribute('class', 'picture-class');
</code></pre>
</div>
</section>
<!-- Inner HTML-->
<section>
<h3>DOM innerHTML</h3>
<p>Each DOM node has an innerHTML property:</p>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
document.body.innerHTML;
</code></pre>
</div>
<div class = "fragment">
You can set innerHTML yourself to change the contents of the node:
<pre><code contenteditable class = "javascript">
document.body.innerHTML = '<p>I changed the whole page!</p>';
</code></pre>
</div>
<div class = "fragment">
You can also just add to the innerHTML instead of replace everything:
<pre><code contenteditable class = "javascript">
document.body.innerHTML += "...just adding this bit at the end of the page.";
</code></pre>
</div>
</section>
<!-- Create element and append child-->
<section>
<h3>DOM Modifying</h3>
<p>The document object can create new nodes:</p>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
document.createElement(tagName);
document.createTextNode(text);
document.appendChild();
</code></pre>
</div>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
var newImg = document.createElement('img');
newImg.src = 'http://girldevelopit.com/assets/pink-logo.png';
document.body.appendChild(newImg);
</code></pre>
</div>
<div class = "fragment">
<pre><code contenteditable class = "javascript">
var newParagraph = document.createElement('p');
var paragraphText = document.createTextNode('New Paragraph!');
newParagraph.appendChild(paragraphText);
document.body.appendChild(newParagraph);
</code></pre>
</div>
</section>
<!-- Exercise-->
<section>
<h3>Let's Develop It</h3>
<ul>
<li>Put it all together</li>
<li>Modify your existing three functions to add new elements to the screen instead of fire an alert</li>
<li>Keep in mind how to find an element, how to append an element, and how to change the inner html of an element</li>
<li>There are lots of possible solutions! Be creative!</li>
</ul>
</section>
<!-- -->
<section>
<h2>Questions?</h2>
<div style = "font-size:1200%; height:100%; margin-top:40%" class ="blue">?
<div class ="clear"></div></div>
</section>
</div>
<footer>
<div class="copyright">
Javascript ~ Girl Develop It ~
<a rel="license" href="http://creativecommons.org/licenses/by-nc/3.0/deed.en_US"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-nc/3.0/80x15.png" /></a>
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