Mittwoch, 18. Mai, 2016

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Delving into Node.js and Express web framework 36 Lets build our application following the MVC pattern If you want to follow along but you dread typing, you can clone the finished project from Github⁸⁰. If you would like to test the project, you have to: • run npm install after cloning • and run node server from the root of the application (where the server.js file is placed) • open up your browser at http://localhost:1337⁸¹ Folder structure So, on a premise of you taking my word for it, let’s create this infamous MVC folder structure. Just copy paste this in your terminal: 1 mkdir app && cd app && mkdir controllers && mkdir models\ 2 && mkdir routes && mkdir views && cd .. && mkdi\ 3 r config && cd config && mkdir env && cd .. && m\ 4 kdir public && cd public && mkdir css && mkdir img &\ 5 & mkdir js && cd .. && tree and you should see the following output (also, you will see the node_modules folder structure which was created when you node installed the express library, not shown here for brevity): folderStructure ⁸⁰https://github.com/Hitman666/MEAN_MVC_2ndTutorial ⁸¹http://localhost:1337
Delving into Node.js and Express web framework 37 Controller Now, in the app/controllers folder, create a file named index.server.controller.js with the following lines of code: 1 exports.render = function(req, res) { 2 res.send('Howdy World'); 3 }; Here we’re using a CommonJS module pattern to define a function named render() which we’ll then later use to require this module and use its function. Express routing Once we’ve created a controller, we’ll need to use Express routing functionality to make use of this controller. Express routing example is shown in the following code snippet: 1 app.get('/', function(req, res) { 2 res.send('This is a GET request'); 3 }); This tells Express to execute the middleware function for any HTTP request that comes through a GET method and is directed to the root path (‘/’). If we would need to deal with POST requests, we would simply use app.post. Express can chain several middlewares in a single routing definition, which means that middleware functions will be called in order. This is usually used to validate requests before executing the response logic. To understand this better, lets take a look at the following example: 1 var port = 1337; 2 var express = require('express'); 3 4 var nameExists = function(req, res, next) { 5 if (req.param('name')) { 6 next(); 7 } 8 else { 9 res.send('What is your name?'); 10 } 11 }; 12 13 var sayHowdy = function(req, res, next) {
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Mittwoch, 18. Mai, 2016

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