Correct me if I am wrong, but it appears that CoffeeScript does not compile/join code (each class has its own file) in the correct order.
If I have these classes in the following files:
Button.coffee
class Button extends UIComponent
UIComponent.coffee
class UIComponpent
When I compile these classes (using the --join flag), it outputs the classes in the incorrect order (i.e. putting Button ahead of UIComponent). So when the referenced .js file is used on a web page, it throws the "Cannot read property 'prototype' of undefined" error
Is this an issue that anyone else experiences? If so, is the standard use of CoffeeScript to not use classes? I'm just confused on why this doesn't appear to be a standard implementation? Perhaps I am using CoffeeScript incorrectly.
CoffeeScript isn't responsible for your dependency management.
You could use something like require.js to define your dependencies, then use CoffeeScript to compile your JavaScript files separately, and then use the r.js optimiser to minify and concatenate your compiled JS.
Related
I've got a List of classes I want to send down to a Scala Template in Play! Framework 2.2.3
however I ran into some issues while trying to do so.
The class I want the list to contain is an arbitrary class type that comes from a package outside of my workspace, but not natively from Java. See the picture below.
Note: I do not have a project/Build.scala file.
The above image represents the first line in my scala template, I have tried to use #import as well (#import com.***.***.type._, com.***.***.type.Version, etc) but to no avail.
This is the error message given to me by Play! Framework.
Is there an issue with the namespacing? Everything works fine when using classes located in my workspace.
The Paths are correct, I've double checked that. For reasons I cannot disclose more code in this region, if more information is required please ask for it and I'll edit the post.
The problem is related to package named type. This word is reserved in Scala as language keyword. You need to escape it like this:
#import List[com.your.package.`type`.Version]
I have two GWT modules with its own entry point, ModuleA and ModuleB. I am using Window.assign() to move from ModuleA to ModuleB. One Variable value is set in ModuleA. How to access the same value from ModuleB?
Thanks in advance.
I have written a couple of answers which could help you to deal with this.
Since you cannot share pure java between two compiled modules: GWT: How to share a java Object (ie: EventBus) between two modules, I suggest to export methods using jsni: How to communicate two modules in GWT. But I would use gwt-exporter or gwt-query to avoid writing js by hand which normally is a source of mistakes: Calling GWT Java function from JavaScript
Note, that these solutions only work in the case both modules are loaded in the same html.
If you want to pass a value to a different page downloading the actual, you can append those values to the new url and read it in the second application:
// Module A
Window.Location.assign("module_B.html?msg=whatever");
// Module B
String msg = Window.Location.getParameter("msg");
IMO the best way would be to implement the observer/observable pattern in pure JavaScript in your host page, and use JSNI in your application to register handlers/fire events.
I have one Fay file which is the heart of my program, however I need some helpers for my logic, for instance a method to replace substrings. From what I understand, if I need such methods which are offered by many Haskell libraries from Hackage directly, I can't use those Haskell libraries, but I must copy-paste the code in my project. So it's what I did, I copy-pasted a "replace" function together with other helpers from the MissingH library in a new file in my project: Utils.hs.
That Utils.hs compiles without problems with Fay. Also I import it in my main Fay file and I get a JS file for the main project file without problems. However at runtime I get the following error:
ReferenceError: Utils$$36$ is not defined
I don't think that Fay will include the code from the helper file in my main JS file, so I'm including both JS files in the loading HTML. And to make even more sure that when I load the main file, that the utils file is loaded, I load it like that:
$.getScript("Utils.js", function(){
$.getScript("FayConfig.js");
});
But despite this I still get the error. I tried compiling the Utils.hs with "--library" but it didn't help.
So my question is, which setup do I need to achieve that the generated JS will find the helper functions that I put in another HS file, knowing that at compile-time, Fay (apparently) finds them without problems? Is there an example of such a setup online? Most of the Fay uses that I found have all the code in a single HS file, though they often use external Fay code from cabal, as with fay-jquery. In my case, setting up a cabal project just for these simple helpers would be overkill.
Which version of Fay are you using (fay --version)? It seems like you are using a version older than
0.16 where forgetting import Prelude wouldn't give any warnings, see this closed ticket. So upgrade fay and/or add import Prelude.
We're also considering renaming operators in the produced output to make error messages like these easier to understand.
You do not need to invoke fay several times, fay outputs all dependencies into the same js file. So there's no difference from using a cabal package in that regard.
Hope this helps, otherwise please give me a way to reproduce this.
I'm trying to change some otherwise working code by pulling all the classes into separate files. This works for most classes, except for the part where it reads class window.Timeline. The error message reads ReferenceError: window is not defined
Any suggestions?
It sounds like your file containing that class isn't getting loaded into the window context. Is it possible that it got loaded in the context of another class? Could you post some cod examples in a jsFiddle?
The pattern that I usually follow when exporting coffeescript symbols to the parent context is
exports = exports ? this
class MyClass
someField: false
exports.MyClass = MyClass
If you are using a modern browser and know how to access the debugging console, you could put
console.log this
At the end of the file that is throwing the reference error. This will allow you to have a look to see what the this context is, which may help you troubleshoot.
I'm trying to work through groovy's Implementing Local AST Transformations tutorial, but whenever I clean my project I get this error in each file that has the #WithLogging annotation in it:
Groovy:Could not find class for Transformation Processor AC.LoggingASTTransformation declared by AC.WithLogging
So you have a package named "AC" that contains both "WithLogging.groovy" and "LoggingASTTransformation.groovy" classes? Does it also contain any classes that implement the "WithLogging" interface?
If so, I'd suggest you move the class(es) that use your annotation to a location outside of the annotation defining package (the default will suffice, for diagnostic purposes) - Order of compilation matters with transformations. See this post on the groovy users mailing list for more on that.
Also try changing the annotation from #WithLogging to #AC.WithLogging.
As far as cleaning with Eclipse is concerned, I had a similar issue and found that I had to make a trivial modification after a clean to any file that contained my annotation. IE, add a space somewhere. Then save the file. This should rebuild everything properly.