#Json packet sender jquery how to

If the request is already complete, the callback is fired immediately. fail() callbacks on a single request, and even to assign these callbacks after the request may have completed. The Promise interface in jQuery 1.5 also allows jQuery's Ajax methods, including $.getJSON(), to chain multiple. For information about the arguments this function receives, see the jqXHR Object section of the $.ajax() documentation. The jqXHR.done() (for success), jqXHR.fail() (for error), and jqXHR.always() (for completion, whether success or error added in jQuery 1.6) methods take a function argument that is called when the request terminates. It is the easiest for human processing of a JSON document if the document is available as a file in the filesystem. It always gets exchanged between applications as a whole. This jQuery XHR object, or 'jqXHR,' returned by $.getJSON() implements the Promise interface, giving it all the properties, methods, and behavior of a Promise (see Deferred object for more information). Simultaneously, JSON is the ideal format for exchanging data between systems with its simple structure and encoding in the Unicode character set. The jqXHR ObjectĪs of jQuery 1.5, all of jQuery's Ajax methods return a superset of the XMLHTTPRequest object. See the discussion of the jsonp data type in $.ajax() for more details. If the URL includes the string 'callback=?' (or similar, as defined by the server-side API), the request is treated as JSONP instead. For example, all strings represented in JSON, whether they are properties or values, must be enclosed in double-quotes. JSON is a data-interchange format with syntax rules that are stricter than those of JavaScript's object literal notation. Avoid frequent hand-editing of JSON data for this reason. The $.Important: As of jQuery 1.4, if the JSON file contains a syntax error, the request will usually fail silently. You must have JQuery loaded for this to work. $('body').append('' + data.quoteText + ' - ' + data.quoteAuthor + '') There are other ways to do this, but I find $.getJSON to be easier. (Anytime you see the $ in front, you know that we’re dealing with JQuery.) It is JQuery’s way of doing an AJAX call. I find the AJAX command to be a little cumbersome, so I prefer to use JQuery’s function, $.getJSON. It stands for “asynchronous JavaScript and XML” ( XML is a different data format, but we’re using json). Now you have many options to convert the image into a base 64 string. var jBody ( objUploadBody ) // Assuming that our return data is in JSON format, evaluate the body html to get our return data. So, how do you get this into your Javascript program? AJAX comes to the rescue. Then send that string along with the other variables to the php backend. document.getElementsByTagName( 'body' ) 0 // Get a jQuery object of the body so that we can have better access to it. Other formats exist, but json is what we’re using. This is sending back a json formatted package. You can test it now by opening a new window and putting that string in the address bar.

Once this structure is built, it is very easy to add new packet types or to send. fromJson (message, Packet.class) packet.handle (foo) In addition, a Packet instance can be converted to JSON without the need for any custom serializer. For example, if I send it, it will send back a quoteĭata package. registerTypeAdapter (Packet.class, new PacketDeserializer ()). Their server has a program running on it that when it is sent a specific string, it will send back a data packet.

#Json packet sender jquery how to

Specifically to this project, we need an API that tells us how to interface with the forismatic server. In short, an API is just an “application programming interface” or a standard for how we can interface with a program, sever, etc. There are plenty of videos to explain some of these things. I would recommend spending some time on youtube. Yes, this is confusing, take a deep breath.