chandlerkent edited this page Aug 12, 2010
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- What is Objective-J?
- Objective-J is a programming language extension to JavaScript, inspired by the Objective-C language.
- It is a strict super-set of JavaScript, which means all existing JavaScript code will also work in Objective-J.
- Objective-J compiles to plain JavaScript for running in web browsers and server-side JavaScript environments.
- It adds several key features which JavaScript lacks, including:
- true classical inheritance
- dynamic message dispatching (facilitating features like forwardInvocation / method_missing)
- relative and library file imports
- What is Cappuccino?
- Cappuccino is a web application framework written in Objective-J, designed for building rich client-side web applications.
- TODO: elaborate on features, etc.
- Do I have to perform a manual compilation step before running Objective-J applications?
- No, the Objective-J compiler is written in JavaScript, and is automatically run on Objective-J code in the browser at runtime. This allows developers to continue with their familiar “edit, save, refresh” workflow.
- So does Objective-J have to compile my code every time I load the application?
- No, you can perform the compilation once before deployment using the tools, eliminating any startup time caused by the compilation step.
- How can I perform cross-domain HTTP requests in Cappuccino?
- Due to same origin policy restrictions in web browsers it is typically not possibly to perform a request to a server on a different domain, port, or protocol (http vs. https). There are some workarounds, such as using JSONP or Flash.
- How can I perform synchronous HTTP requests in Cappuccino?
- You shouldn’t. Due to the single-threaded nature of JavaScript in web browsers you can’t perform a synchronous HTTP request without hanging the browser’s user interface for the duration of the request, which is a very bad thing to do.
- That said, if you have a very good reason, you are probably looking for:
[CPURLConnection sendSynchronousRequest:[CPURLRequest requestWithURL:aURL] returningResponse:nil];