Download E-books Opa: Up and Running PDF

By Henri Binsztok, Adam Koprowski, Ida Swarczewskaja

Want to simplify net improvement? This hands-on e-book exhibits you the way to put in writing frontend and backend code at the same time, utilizing the Opa framework. Opa offers a whole stack for net program improvement, together with an online server, database engine, distribution libraries, and a programming language that compiles to JavaScript.

You’ll research step by step tips on how to use Opa by means of development tasks throughout the process the e-book: a wiki software just like Wikipedia, and a Twitter-like micro-blogging platform. detect how effortless it's to take advantage of Opa to boost functions with real-time updates, database interactions, and internet carrier design.
• study basic techniques, together with Opa’s useful programming style
• detect how Opa compiles to JavaScript, utilizing jQuery at the frontend and Node.js at the server
• build HTML assets dynamically and embed static assets on an Opa server
• Use Opa’s technique for acting CRUD operations and storing key-value pairs in MongoDB
• construct an Opa consumer interface with the Bootstrap toolkit from Twitter
• examine version varieties, pattern-matching, polymorphic varieties, recursive capabilities, and different complex features
• deal with consumer bills via construction login types, dealing with account activation, and monitoring logged users
• construct a reactive UI—a real-time interface that constantly updates person events

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Rather than together with every one photo one after the other, you should use @static_ resource_directory: assets = @static_resource_directory("resources") This line of code will contain all assets in keeping with all documents from a given listing (here, assets) and its subdirectories. what's the form of this variable? Such an embedded listing is represented as a map‐ ping from filenames (string) to assets (resource), and as a result has the sort map(string, resource). we are going to speak extra approximately maps in “Maps (Dictionaries)” (page 38). The opposite numbers of these directives are @static_content and @static_content_directory, and so they divulge the content material of the exterior records with no wrapping them up as assets. 28 | bankruptcy three: Servers, assets, and URLs Serving assets Embedding assets is step one. your next step is to coach the internet server to serve them for definite requests. have in mind the Server. begin functionality and the way you used it on your first Opa app in “Writing and operating the Code” (page 4)? the second one argument defines how diversified requests will be dealt with. To serve assets from the resour‐ ces listing you first have to embed them: assets = @static_resource_directory("resources") Now you must create a server for them: Server. start(Server. http, {resources: resources}) be aware that ahead of you used a {title: ... , web page: ... } variation for this moment argument to create a single-page app, that's, to direct all shopper requests to web page. This new variation, {resources: ... }, creates a server that simply responds to requests for assets. think that the neighborhood assets listing has the subsequent constitution: +- assets +- imgs | +- opa-logo. png +- css | +- variety. css to that end, working the previous software and directing the browser to http:// localhost:8080/resources/css/style. css could provide the stylesheet. What if you happen to attempted another URL? this may lead to the notorious "Error 404: now not discovered" mistakes. okay, so what should you desired to expand your “Hello net” program a little bit and use a few assets in it? you may use servers: // serve assets Server. start(Server. http, {resources: @static_resource_directory("resources")}) // serve the most web page functionality page() { Opa

This is a demo of an easy Opa app.

} Server. start(Server. http, { name: "Hello web", web page: web page }) be aware how this code mixed the directive to embed the assets and the server dec‐ laration in a single; this is often fullyyt permissible. Serving assets | 29 What occurs in the event you claim multiple server? for each request, the servers might be attempted one after the other. If a request should be dealt with via the assets server, it handles it. another way, the request can be passed over to the second one server, which hence can deal with each request. bear in mind that the order of the servers does subject. when you swapped the declarations, all URLs will be dealt with through your “one web page server” and for this reason no assets may ever be served.

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