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<h1 style="text-align: center;">node - expressjs</h1>
<h2>[previously]</h2>
<ol>
<li>[REFERENCE]</li>
<ol>
<li>] # 5218 - learning&nbsp;<a href="/view/task?id=5218" target="_blank">node on windows</a> -</li>
<li>] #&nbsp;191 -&nbsp;<a href="/view/chapters?id=191" target="_blank">BOOK of&nbsp;javascript</a>&nbsp;</li>
<li>] # # - <a href="http://expressjs.com/4x/api.html" target="_blank">API 4.x</a>&nbsp;</li>
<li>] # # - <a href="http://stackoverflow.com/questions/tagged/express" target="_blank">stackoverflow</a>-express&nbsp;</li>
<li>] # # - <a href="http://stackoverflow.com/questions/5778245/expressjs-how-to-structure-an-application" target="_blank">ExpressJS How to structure an application?</a>&nbsp;</li>
</ol>
<li>] NEW task IN <ol>
<li>] why express -&nbsp;personally, i fell into using/learning&nbsp;express, was included in a starter site template, then in a tutorial i looked at, it seemed as good as any i had used before(i hadnt used any before), and 100K+ cant be wrong can they?</li>
</ol></li>
<li>] example - my first "express" app <ol>
<li>] <a href="/view/task?id=4800" target="_blank">PASS</a> - </li>
<li>] using </li>
<li>] PRB with calling out to an api and processing the results</li>
<li>] </li>
</ol></li>
<li>[00:00] NEW task IN CREATE-article# #</li>
<ol>
<li>] # # - overview - a lightweight server side&nbsp;(MVC) application development&nbsp;framework, popular,</li>
<ol>
<li>PROs =</li>
<li>CONS =</li>
<li>ALTS = sails.js, loopback.io</li>
<li>] express or sails&nbsp;- <a href="http://www.quora.com/Should-one-learn-Express-js-or-Sails-js" target="_blank">http://www.quora.com/Should-one-learn-Express-js-or-Sails-js</a>&nbsp;sails = express + ORM + MVC structure, ALSO loopback.io</li>
</ol></ol>
<li>[00:00] NEW task IN </li>
<ol>
<li>]</li>
</ol>
<li>[00:00] how to - understanding how express works </li>
<ol>
<li>] app.js - your web server, the 'main' or your&nbsp;app</li>
<ol>
<li>] my example/sample program is named - server.js</li>
<li>] this is the name of the file to launch when you start your app</li>
<ol>
<li>] node server.js</li>
</ol>
<li>] it is the main configuration file for your Express app.</li>
<li>] .listen(port) -</li>
</ol>
<li>] requires</li>
<ol>
<li>] telling your app which program/packages and data to use&nbsp;The require function is pretty straight forward. It's a built-in Node function that imports an object (module.exports) from another file or module.</li>
<li>] /routes - specifing a file which will define&nbsp;which routes your app will use</li>
<li>] /users -</li>
</ol>
<li>] requires --&gt; module.exports()</li>
<ol>
<li>] define code that will be avail, code file needs module.exports{ function(){} }, app need requires(''</li>
</ol>
<li>] <a href="http://expressjs.com/api.html#app.set" target="_blank">app.set</a></li>
<ol>
<li>]</li>
<li>] app.set('views', path.join(__dirname, 'views'));&nbsp; specify the path to the view folder</li>
<li>] app.set('view engine', 'jade');&nbsp; - specify which view engine to use</li>
<li>*] CC jade templating package -&nbsp;&nbsp; simplifies your HTML files and gives you conditionals, Instead of saving your files as .html, you'll now have to save them as .jade in your /views folder</li>
</ol>
<li>] <a href="http://expressjs.com/4x/api.html#app.use" target="_blank">app.use</a>&nbsp;&nbsp;</li>
<ol>
<li>] tells the app how to use the parameters you're giving it. This can be a function or a path and a function</li>
<li>] Mounts the <a href="http://expressjs.com/guide/using-middleware.html" target="_blank">middleware</a> <code>function</code>(s) at the <code>path</code>. If <code>path</code> is not specified, it defaults to &ldquo;/&rdquo;.</li>
<li>] example defaults - app.use(bodyparser.json())</li>
</ol>
<li>] special 404</li>
<ol>
<li>] not the result of an error but rather the app running out of {route} options.</li>
<li>] Once the request doesn't match any of the routes, it will reach the following function.</li>
</ol>
<li>] error handling </li>
<ol>
<li>] specify code in app.js to handle errors</li>
<li>] render full errors in development mode VS error messages in production</li>
</ol>
<li>] module.exports</li>
<ol>
<li>] Remember that require function?(#2) That makes use of the module.exports! When you want to use some variables or functions from another file, you attach them to the module.exports.</li>
<li>] example -</li>
<ol>
<li>var&nbsp;myModule = {</li>
<li>&nbsp; add: function (a,b){</li>
<li>&nbsp;&nbsp;&nbsp;&nbsp; return a+b;</li>
<li>&nbsp; }</li>
<li>module.exports(myModule);</li>
</ol>
<li>] add a requires statement to your app.js</li>
<ol>
<li>var&nbsp;myModule = require('./mymodule.js');</li>
</ol>
<li>] use</li>
<ol>
<li>myModule.add(3,2); // 5</li>
</ol>
<li>] CC - practical experience</li>
<ol>
<li>] #&nbsp;<a href="/view/task?id=5273" target="_blank">5273 -v-004-002</a> - &nbsp;&nbsp;practical experience USING/implementing modules in the PASS app - SUMMARY = x]&nbsp;module works but diferent code than this document, ] unsuccessfull at making api call from within module, same code works in the 'index.js' page</li>
</ol></ol></ol></ol>
<h2>[currently]</h2>
<ol>
<li>] adding requestjs </li>
<ol>
<li>] for handling http requests</li>
</ol></ol>
<h2>[next]</h2>
<ol>
<li>] <a href="http://expressjs.com/starter/basic-routing.html">http://expressjs.com/starter/basic-routing.html</a>&nbsp;-</li>
<ol>
<li>]</li>
</ol>
<li>] <a href="http://jilles.me/getting-the-express-app-js/">http://jilles.me/getting-the-express-app-js/</a></li>
<ol>
<li>]</li>
</ol>
<li>] <a href="https://www.packtpub.com/books/content/understanding-express-routes" target="_blank">understanding express routes </a>-</li>
<ol>
<li>]</li>
</ol>
<li>] <a href="http://eloquentjavascript.net/04_data.html">http://eloquentjavascript.net/04_data.html</a>&nbsp;- data structures objects and arrarys</li>
</ol>
&nbsp;
<hr />
&nbsp;
2] understanding expressjs
&nbsp;
<pre style="background: white; color: black; font-family: Consolas; font-size: 10pt;">// TRY adding special 404 - aka no routes matched
function next(err){
 alert('doodledoop');
}
 
app.use(function(req, res, next) { 
 var err = new Error('that piglet is NOT Found');
 err.status = 404;
 
 res.status(err.status || 500);
 res.render('./errors/404', {
 message: err.message,
 error: {}
 })
 //next(err);
 
});</pre>