Django JavaScript Integration: AJAX and jQuery by Jonathan Hayward

By Jonathan Hayward

This ebook will train you the way to counterpoint your AJAX functions with Django and jQuery in a realistic demeanour with minimal fuss. It introduces AJAX fundamentals, will get a bit deeper, after which is going chapter-by-chapter via a delicately selected case research. It demonstrates how diverse items of a Django AJAX software paintings in themselves and are prepare and particularly leads you thru development an intranet worker photograph listing with social networking beneficial properties. This booklet is for individuals trying to combine AJAX / JavaScript performance into their net functions. it really is for Django clients who're seeking to simply combine AJAX positive aspects into their purposes. Conversely, it's going to even be a necessary significant other for clients acquainted with Django and jQuery who're and searching to combine them of their AJAX purposes. A operating wisdom of Django and easy familiarity with AJAX and jQuery are assumed.

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There's a lot there, and it's a lot harder to understand than learning by jumping in. Closures represent a key concept in core JavaScript, along with other things such as functions, objects, and prototypes. Closures are part of the conceptual landscape and not only because they are the basis on how to effectively create an object with private fields. So we will jump in and give a closure that serves as a proof of concept as, effectively, an object with private fields. To give a standard, "bare JavaScript" example of using a closure to create an object with private variables, which creates an object that stores an integer value, has a getter and setter, but in Java fashion ensures that the field can only have an integer value.

Among other problems, setting it to false can lock up the visitor's browser. The last two arguments are the username and password as optionally specified in HTTP. If they are not specified, they default to any username and password defined for the web page. 5. send(content) Content can be a string or a reference to a document. Properties A bare-bones XMLHttpRequest object can be expected to have the following properties: 1. onreadystatechange, which is called without argument each time the ready state of XMLHttpRequest changes.

GetAllResponseHeaders() This returns all HTTP response headers sent with the response. 3. getResponseHeader(headerName) This returns the requested header if available, or a browser-dependent false value if the header is not defined. [ 14 ] Chapter 1 4. open(method, URL, asynchronous, username, password) The method is GET, POST, HEAD, or one of the other less frequently used methods defined for HTTP. The URL is the relative or absolute URL to fetch. As a security measure for JavaScript running in browsers on trusted internal networks, a same origin policy is in effect, prohibiting direct access to servers other than one the web page came from.

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