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class4.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Intermediate JavaScript</title>
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</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<!-- AJAX and JSON -->
<section>
<h1>JSON & AJAX</h1>
</section>
<section>
<h3>JSON</h3>
<ul>
<li class="fragment">JSON = JavaScript Object Notation</li>
<li class="fragment">A set of key/value pairs</li>
<li class="fragment">Keys must be stored in quotes</li>
<li class="fragment">Values can be Number, String, Boolean, Array, Object or null</li>
<li class="fragment">Resembles objects, hash tables, or structs of programming languages</li>
<li class="fragment">Can be validated at <a href="http://jsonlint.com/" target="_blank">JSONlint.com</a></li>
</ul>
<aside class="notes">
<ul>
<li>JSON = JavaScript Object Notation</li>
<li>A set of key/value pairs</li>
<li>Keys must be stored in quotes</li>
<li>Values can be Number, String, Boolean, Array, Object or null</li>
<li>Resembles objects, hash tables, or structs of programming languages</li>
<li>Can be validated at <a href="http://jsonlint.com/" target="_blank">JSONlint.com</a></li>
</ul>
</aside>
</section>
<section>
<h3>Example JSON</h3>
<pre><code class="javascript">{
"firstName": "Jane",
"lastName": "Smith",
"address": {
"streetAddress": "425 2nd Street",
"city": "San Francisco",
"state": "CA",
"postalCode": 94107
},
"phoneNumbers": [
"212 732-1234",
"646 123-4567" ]
}</code></pre>
<aside class="notes">
<ul>
<li>Notice the "" for all the attribute names</li>
<li>JSON supports two widely used (amongst programming languages) data structures:</li>
<li>A <strong>collection of name/value pairs.</strong></li>
<li>An ordered list of values</li>
<li>Since data structure supported by JSON is also supported by most of the modern programming languages data-interchange format.</li>
</aside>
</section>
<section>
<h3>Moving JSON to the DOM</h3>
<p>Start by storing JSON in a variable:</p>
<pre><code class="javascript">var myProfile = {
"firstName": "Natalie",
"lastName": "MacLees",
"cats": ["Mabel", "Ollie"]};</code></pre>
<p>Then, you can access the data stored inside and use it while creating new nodes:</p>
<pre><code class="javascript">var p = document.createElement('p');
p.innerHTML = 'My name is ' + myProfile.firstName + ' ' + myProfile.lastName + '. ';
p.innerHTML += 'My cats are ' + myProfile.cats.join(' and ') + '.';
var body = document.getElementsByTagName('body')[0];
body.appendChild(p);</code></pre>
<a href="http://bit.ly/intermediate-js-json-dom" target="_blank">http://bit.ly/intermediate-js-json-dom</a>
</section>
<section>
<h3>Let's Develop It!</h3>
<p><a href="files/exercise-videoplayer.html" target="_new">Exercise instructions</a></p>
<p><a href="http://bit.ly/intermediate-js-class-4-ex-1" target="_blank">http://bit.ly/intermediate-js-class-4-ex-1</a></p>
<p>
Note: to get json files in your codepen.io
<ol>
<li>
Open Settings
</li>
<li>
Go to JavaScript
</li>
<li>
Add the url to "Add External JavaScript"
</li>
</ol>
</p>
</section>
<section>
<h2>Questions?</h2>
<p>Questions about JSON?</p>
</section>
<section>
<h3>Ajax</h3>
<p>Asynchronous JavaScript And "XML"</p>
<img src="img/ajax.png" height="400" width="600" alt="">
<aside class="notes">
<ul>
<li>Client is your machine/browser</li>
<li>JavaScript</li>
<li>Eventhandler is our listener</li>
<li>Callback function we write</li>
<li>Manipulates the DOM elements on the webpage</li>
<li>During our event handling we can call out to the server with <strong>XMLHttpRequest</strong></li>
</ul>
</aside>
</section>
<section>
<h3>Ajax in the wild</h3>
<img src="img/wild-ajax.png" height="880" width="1136" alt="">
<aside class="notes">
<ul>
<li>Let's look at an example of AJAX</li>
<li>show example of ajax calls in console. <a href="https://twitter.com/gdidayton" target="_blank">https://twitter.com/gdidayton</a></li>
<li>Open the dev tools, go to network tab</li>
<li>Sort by XHR</li>
<li>find something with a json</li>
</ul>
</aside>
</section>
<section>
<h3>Local server</h3>
<p>We're going to start writing some ajax now.</p>
<p>If you haven't already, get a local server running.</p>
<p><a href="files/exercise-localserver.html" target="_new">Local Server Help</a></p>
</section>
<section>
<h3>Local server</h3>
<ol>
<li>Open Terminal</li>
<li>Navigate to your project directory. You can do this using the <code>cd</code> command in the terminal.</li>
<li>Run this command: <code>python -m SimpleHTTPServer</code>
<ul><li>If you are running Python 3, run this command instead: <code>python -m http.server 8000</code></li></ul>
</li>
<li>If successful, you should then be able to access your project folder by pointing your browser to http://localhost:8000</li>
</ol>
<p><a href="files/exercise-localserver.html" target="_new">Local Server Help</a></p>
</section>
<section>
<h3>The <code>XMLHttpRequest</code> object</h3>
<ul>
<li>A native JavaScript object that can communicate <span class="blue">asynchronously</span> between the client and the server.</li>
<li>To use it, we create a new instance of the object:
<pre><code class="javascript">var request = new XMLHttpRequest();</code></pre>
</li>
<li>...and then use the properties and methods of that object to make an ajax call</li>
</ul>
<p class="fragment"></br>
<strong>Asynchronous</strong> means you can move on to another task before it finishes, while <strong>synchronous</strong> means you wait for it to finish before moving on to another task.
</p>
<aside class="notes">
Make note of asynchronous v. syncronous. How this will be important
for waiting for your data to return.
</aside>
</section>
<section>
<h3>Getting ready to communicate</h3>
<p>Now that we've created an instance of the XHR object, it needs to be prepped for communition. That requires three things:</p>
<ol>
<li>The <code>readystatechange</code> event handler</li>
<li>The <code>open()</code> method</li>
<li>The <code>send()</code> method</li>
</ol>
<p></br>
<a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest" target="_blank">Check out the documentation for XMLHttpRequest</a>
</p>
<aside class="notes">
These are talked about on the next slides
</aside>
</section>
<section>
<h3><code>readystatechange</code></h3>
<ul>
<li>During an ajax operation, the server sends updates to the client about the current status of the communication by updating a property of the XHR object called <code>readyState</code>.</li>
<li class="fragment">Each time the <code>readyState</code> property is changed, the <code>readystatechange</code> event is fired.</li>
<li class="fragment">If you add an event listener function to the <code>readystatechange</code> event, your function will execute each time the server pings the client with an update.</li>
</ul>
<aside class="notes">
<li>Each time the <code>document.readyState</code> property is changed, the <code>readystatechange</code> event is fired.</li>
<li>If you add an event listener function to the <code>readystatechange</code> event, your function will execute each time the server pings the client with an update.</li>
</aside>
</section>
<section>
<h3>An <code>onreadystatechange</code> example</h3>
<pre><code class="javascript">var request = new XMLHttpRequest();
if(request) {
request.addEventListener('readystatechange', function(){
console.log(request.readyState);
});
}</code></pre>
<aside class="notes">
This code doesn't do anything right now. Since there are no state changes
</aside>
</section>
<section>
<h3>The <code>open()</code> method</h3>
<div class="left-align">
<p>The <code>open()</code> method takes two required arguments:</p>
<ol>
<li>The type of request (string)</li>
<li>The location of the file on the server (string)</li>
</ol>
<pre><code class="javascript">XMLHttpRequest.open(method, url)
XMLHttpRequest.open(method, url, async)
XMLHttpRequest.open(method, url, async, user)
XMLHttpRequest.open(method, url, async, user, password)
</code></pre>
<div class="fragment">
<p > And an additional optional argument:</p>
<ol>
<li>Whether or not the request should be asynchronous (Boolean)</li>
</ol>
</div>
</div>
<aside class="notes">
<div class="left-align">
<p>The <code>open()</code> method takes two required arguments:</p>
<ol>
<li>The type of request (string)</li>
<li>The location of the file on the server (string)</li>
</ol>
<span >
<p>And an additional optional argument:</p>
<ol>
<li>Whether or not the request should be asynchronous (Boolean)</li>
</ol></span>
</div>
</aside>
</section>
<section>
<h3>Request types: <code>GET</code> and <code>POST</code></h3>
<dl>
<dt><code>GET</code></dt>
<dd>
<ul>
<li>Most commonly used</li>
<li>When you just want to retrieve a file from the server and you don't need to send any data</li>
<li>Also capable of sending a small amount of data as a query string</li>
</ul>
</dd>
<dt><code>POST</code></dt>
<dd>
<ul>
<li>Useful for sending a lot of data to the server</li>
</ul>
</dd>
</dl>
<p><small>Just FYI, there are some other request types too (<code>PUT</code>, <code>DELETE</code>, and <code>HEAD</code>, for example), but they're not a concern for the stuff we're doing.</small></p>
</section>
<section>
<h3>Location of the file</h3>
<ul>
<li>A string that contains either a relative, absolute, or full path to a file on the server</li>
<li>The file you are requesting must reside in the same domain as the JavaScript file that is making the request.</li>
</ul>
</section>
<section>
<h3>Cross Domain Policy</h3>
<h4>or Same-Origin Policy</h4>
<p>If we're on this page: <a>http://store.company.com/dir/page.html</a></p>
<p>Here's how these ajax requests will work out:</p>
<table>
<thead>
<tr>
<th>URL</th>
<th>Outcome</th>
<th>Reason</th>
</tr>
</thead>
<tbody>
<tr class="success">
<td>http://store.company.com/dir2/other.html</td>
<td>Success</td>
<td></td>
</tr>
<tr class="success">
<td>http://store.company.com/dir/inner/other.html</td>
<td>Success</td>
<td></td>
</tr>
<tr class="failure">
<td>https://store.company.com/secure.html</td>
<td>Failure</td>
<td>Different protocol</td>
</tr>
<tr class="failure">
<td>http://store.company.com:81/dir/etc.html</td>
<td>Failure</td>
<td>Different port</td>
</tr>
<tr class="failure">
<td>http://news.company.com/dir/other.html</td>
<td>Failure</td>
<td>Different host</td>
</tr>
<tr class="failure">
<td>http://google.com</td>
<td>Failure</td>
<td>Different host</td>
</tr>
</tbody>
</table>
<p class="fragment">
This is to prevent malicious scripts from running on the page.
</p>
</section>
<section>
<h3>Asynchronous</h3>
<p>Indicates whether the request should occur asynchronously or not.</p>
<p>If <code>true</code>, the script will make the request and won't wait for the response from the server before moving on to the rest of the script.</p>
<p>If <code>false</code>, the browser will stop processing the script until the ajax request is completed.</p>
<h4>Use <code>true</code>!</h4>
</section>
<section>
<h3>The <code>send()</code> method</h3>
<p>Once your request is prepped by the <code>open()</code> method, it's ready to be sent!</p>
<pre><code class="javascript">XMLHttpRequest.send(body)</code></pre>
</section>
<section>
<h3><code>send()</code> using <code>GET</code></h3>
<pre><code class="javascript">var request = new XMLHttpRequest();
if(request) {
request.addEventListener('readystatechange', function(){
console.log(request.readyState);
});
request.open('GET', 'me.json', true);
request.send();
}</code></pre>
<p>Here's a <a href="files/me.json">me.json</a> file you can include in your project to call.</p>
<p>
Here is a link to the <a href="https://gist.githubusercontent.com/kcjonesevans/25d86771f45b4f4fc61f92185c473404/raw/28c65580c775243e7adb4851611c7923e233c04c/me.json" target="_blank">gist</a>
</p>
<p><a href="http://bit.ly/intermediate-js-class4-xmlhttprequest" target="_blank">http://bit.ly/intermediate-js-class4-xmlhttprequest</a></p>
</section>
<section>
<h3>The <code>readyState</code> property</h3>
<p>Indicates the current state of the Ajax request. Possible values:</p>
<img src="img/readystate.png" width="1136" alt="">
</section>
<section>
<h3><code>POST</code>: The <code>setRequestHeader()</code> method</h3>
<p>Since we're sending data with the <code>POST</code> type, we have an extra step. We need to use the <code>setRequestHeader</code> method of the XHR object to set the request headers.</p>
<p>Request headers are bits of metadata that describe the request so the server understands what to expect from the data received.</p>
<p><code>setRequestHeader()</code> takes two arguments:</p>
<ol>
<li>Name of the header (string)</li>
<li>Value of the header (string)</li>
</ol>
<pre><code class="javascript">XMLHttpRequest.setRequestHeader(header, value);</code></pre>
</section>
<section>
<h3><code>setRequestHeader()</code> example</h3>
<p>If you are sending data to the server, you need to set the value of the <code>Content-type</code> header to <code>application/x-www-form-urlencoded</code>, like this:</p>
<pre><code class="javascript">request.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');</code></pre>
<p>This tells the server to expect some data and for that data to be URL-encoded.</p>
<p><span class="blue">URL-encoded</span> means spaces become plus signs (+) and non-alphanumeric characters need to be encoded as <a href="http://www.degraeve.com/reference/urlencoding.php">hex values</a>.</span></p>
<pre><code class="javascript">'name=Natalie+MacLees&message=JavaScript+is+awesome%21'</code></pre>
</section>
<section>
<h3><code>send()</code> using <code>POST</code></h3>
<pre><code class="javascript">var request = new XMLHttpRequest();
if(request) {
request.addEventListener('readystatechange', function(){
console.log(request.readyState);
});
request.open('POST', 'me.php', true);
request.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
request.send('name=Natalie+MacLees&message=JavaScript+is+awesome%21');
}</code></pre>
<p>
<a href="http://bit.ly/intermediate-js-class4-post" target="_blank">http://bit.ly/intermediate-js-class4-post</a>
</p>
<p>
This code won't work with simpleserver (which does not support POST)
</p>
</section>
<section>
<h3>Let's Develop It!</h3>
<p>In your project folder, create a simple <code>.txt</code> file with a sentence of plain text in it.</p>
<p>Next, set up a new XMLHttpRequest (XHR) object and get the file. Use the console tools to view the request.</p>
</section>
<section>
<h3>Receiving a response</h3>
<p>Phew! Now we've got sending a request down - let's learn how to receive a response!</p>
</section>
<section>
<h3>The <code>readyState</code> property</h3>
<p>Indicates the current state of the Ajax request. Possible values:</p>
<img src="img/readystate.png" width="1136" alt="">
</section>
<section>
<h3><code>readyState</code> property and the <code>readyStateChange</code> event</h3>
<p>In theory, the readyState property counts from 0 to 4 in order.</p>
<p>In practice, what happens is a bit unpredictable.</p>
<p>What we <em>can</em> count on is that if the value has reached <code>4</code>, the server has finished sending a response.</p>
</section>
<section>
<h3>Checking the <code>readyState</code></h3>
<pre><code class="javascript">var request = new XMLHttpRequest();
var doSomething = function() {
if (request.readyState == 4) {
console.log('The request is complete!');
//do something with the response here
}
}
if(request) {
request.addEventListener('readystatechange', doSomething);
request.open('GET', 'me.json', true);
request.send();
}</code></pre>
<p><code>doSomething()</code> gets called every time the value of the <code>readyState</code> property changes, but our <code>if</code> statement ensures nothing will happen unless the value is <code>4</code>.</p>
<p>
<a href="http://bit.ly/intermediate-js-class4-readystate" target="_blank">http://bit.ly/intermediate-js-class4-readystate</a>
</p>
</section>
<section>
<h3>Status</h3>
<p>When the server sends back a response, it always includes response headers with metadata about the response.</p>
<p>These headers include a <span class="blue">status code</span> - a three digit number that is part of the HTTP protocol</p>
<p>Some examples:</p>
<ul>
<li><code>404</code> - not found</li>
<li><code>403</code> - forbidden</li>
<li><code>500</code> - internal server error</li>
</ul>
</section>
<section>
<h3>200 OK</h3>
<p>The most common status code is <code>200</code>, which means <code>OK</code>. It indicates the response was successfully sent.</p>
<p>The XHR object has a property called <code>status</code> where the status code is stored. We can check it to make sure we got a successful response:</p>
<pre><code class="javascript">var doSomething = function() {
if(request.readyState == 4) {
if(request.status == 200) {
console.log('The request is complete and ok.');
//do something with the response here
}
}
}</code></pre>
</section>
<section>
<h3>When things don't go as planned...</h3>
<p>We can also add an <code>else</code> statement to deal with situations where things don't go according to plan:</p>
<pre><code class="javascript">var doSomething = function() {
if(request.readyState == 4) {
if(request.status == 200) {
console.log('The request is complete and ok.');
//do something with the response here
} else {
//something went wrong
}
}
}</code></pre>
</section>
<section>
<h3>The <code>responseText</code> property</h3>
<p>The <code>responseText</code> property of the XHR object contains the data sent from the server as a string.</p>
<pre><code class="javascript">var doSomething = function() {
if(request.readyState == 4) {
if(request.status == 200) {
console.log(request.responseText);
}
}
}</code></pre>
</section>
<section>
<h3>But we need JSON!</h3>
<p>The <code>responseText</code> property contains our data, but it's a string, and we need JSON. We just need to convert it to JSON like this:</p>
<pre><code class="javascript">var jsonObj = JSON.parse(request.responseText);</code></pre>
</section>
<section>
<h3>Putting it all together</h3>
<p>Let's step through fetching some information from the server with ajax and displaying it on our page.</p>
<p>
<a href="http://bit.ly/intermediate-js-class4-all" target="_blank">http://bit.ly/intermediate-js-class4-all</a>
</p>
</section>
<section>
<h3>First, we need to create, prep, and send our request:</h3>
<pre><code class="javascript">var request = new XMLHttpRequest();
var displayResponse = function(){
// we'll write some code here later
};
if (request) {
request.addEventListener('readystatechange', displayResponse);
request.open('GET', 'me.json', true);
request.send();
}</code></pre>
</section>
<section>
<h3>Next, we need a place in our HTML to display the results:</h3>
<pre><code class="xml"><div id="resultsBox"></div></code></pre>
</section>
<section>
<h3>Then, we'll handle the response</h3>
<pre><code class="javascript">var displayResponse = function(){
if (request.readyState == 4) {
if (request.status == 200) {
var jsonObj = JSON.parse(request.responseText);
var p = document.createElement('p');
p.innerHTML = 'My name is ' + jsonObj.firstName + ' ' + jsonObj.lastName + ' and I live at ' + jsonObj.address.streetAddress + ' in ' + jsonObj.address.city + '. ';
p.innerHTML += 'My zip code is ' + jsonObj.address.postalCode + '.';
var displayBox = document.getElementById('resultsBox');
displayBox.appendChild(p);
}
}
};</code></pre>
<p>We're using what we already learned about dealing with JSON!</p>
</section>
<section>
<h3>Let's Develop It!</h3>
<p><a href="files/exercise-ajaxvideoplayer.html" target="_new">Exercise Instructions</a></p>
</section>
<section>
<h3>Ajax</h3>
<p>The <code>XMLHttpRequest</code> is the heart and soul of ajax. Its methods and properties drive the requests that make ajax feel so responsive.</p>
</section>
<section>
<h3>Things to keep in mind</h3>
<ul>
<li>Cross domain requests are restricted.</li>
<li>Multiple ajax requests don't return in the same order they were sent.</li>
</ul>
</section>
<section>
<h2>Questions?</h2>
<p>Questions about JSON or Ajax before we wrap up?</p>
</section>
<section>
<h3>Survey</h3>
<p>Survey info and links in <a href="https://gdidayton.slack.com" target="_blank">slack</a>.</p>
</section>
<section>
<h3>Thank you!</h3>
<p>As you keep working with JavaScript, if you have questions or get stuck, post in our <a href="https://gdidayton.slack.com">slack</a> and we'll help you out!.</p>
</section>
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