By Manuel Kiessling

ISBN-10: 1471628442

ISBN-13: 9781471628443

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At this point, content is still “empty”, due to the fact that the callback function passed to exec() has not yet been called - because exec() operates asynchronous. Now, “ls -lah” is a very inexpensive and fast operation (unless there are millions of files in the directory). Which is why the callback is called relatively expeditious - but it nevertheless happens asynchronously. js itself continues with the application, and we may assume that the callback function we passed into exec() will be called only when the “find /” command has finished running.

Js ships with its own package manager, dubbed NPM. js modules in a very convenient fashion. js installation, it boils down to issuing Building the application stack 59 npm install formidable on our command line. 2 npm ok then we are good to go. js. All we need to do is create a new IncomingForm, which is an abstraction of this submitted form, and which can then be used to parse the request object of our HTTP server for the fields and files that were submitted through this form.

Handling the whole bulk of data in one go would result in a blocking operation. js serves our code the POST data in small chunks, callbacks that are called upon certain events. These events are data (an new chunk of POST data arrives) and end (all chunks have been received). js which functions to call back to when these events occur. This is done by adding listeners to the request object that is passed to our onRequest callback whenever an HTTP request is received. addListener("end", function() { // called when all chunks of data have been received }); The question arises where to implement this logic.

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The Node Beginner Book: A Comprehensive Node.js Tutorial by Manuel Kiessling


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