coffeescript | 易学教程

Get a Backbone Model instance's model/class name

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问题 Given an instance of Backbone model, how can I know the "class" (so to speak) of this instance ? For instance: class Car extends Backbone.Model mycar = new Car() And what I need is: mycar.modelName # => 'Car' 回答1: It's problematic in general, I think. I was going to suggest some of the options mentioned here ( How do I get the name of an object's type in JavaScript? ) but I was having issues with the first option. You could always extend all your models to have a function that returned a

Change attribute using checkbox, AJAX, jQuery

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问题 I wish to change the boolean attribute of my Task resource depending on wether checkbox is checked or not. I am stuck as I don't know what to do... I have everything before adding this AJAX checkbox working, whole CRUD, everything tested with rspec and capybara and bootstrapped. I have the following code... views/tasks/show.html.erb 27 <%= form_for [@project, @task], :remote => true do |f| %> 28 <%= f.label :completed %> 29 <%= f.check_box :completed %> 30 <% end %> This :completed is the

Dojo + Rails 3.2.8 + CoffeeScript

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问题 I'm trying to use Dojo Toolkit 1.8 instead JQuery in a Rails 3.2.8 web application, mainly due of the lack of a complete and visually uniform widget based on JQuery. Followed these steps: Unzip dojo, dijit and dojox directories into app/assets/javascripts Changed in application.js //= require_tree . to //= require_directory . Edited application layout (Not unobtrusive yet... just to effect of testing) views/layouts/application.html.erb <!DOCTYPE html> <html> <head> <title>Dojo</title> <%=

Rails 3.1 Ajax question

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问题 I have a scaffold called post which has a title and a description. On my layout I have a link to create a new post that has :remote => true. How would I make it when I click on that remote link to change the content of a div so that I can create a new post? 回答1: Let's suppose the action you will use is called new . You should create a file called new.js.erb into views/posts that will be rendered when you post remotely your form. That file must include the javascript that places the new post

Fixing Initializers deprecation in Ember 1.12.0

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问题 I am refering to this particular deprecation that was introduced in Ember 1.12 lookup was called on a Registry. The initializer API no longer receives a container, and you should use an instanceInitializer to look up objects from the container I looked at the guide, but I am unsure on how to fix this. Here's a snippet of the code I have at the moment initialize = (container, app) -> auth = container.lookup('auth-manager:main') local_config = ($.ajax type: 'GET' url: '/config.json' async:false

How to create a CoffeeScript style existential operator in JavaScript?

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问题 CoffeeScript turns user?.id into if (typeof user !== "undefined" && user !== null) { user.id; } Is it possible to create a JavaScript function exists that would do something similar? i.e. exists(user).id would result in either user.id or null It would be easier if a function accepts another parameter, i.e. exists(user, 'id') , but that wouldn't look as nice. 回答1: No, you can't produce such a function. The problem is that this: any_function(undeclared_variable) will produce a ReferenceError if

how to pass compiler options to mocha

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问题 I run a mocha command to run my tests $ ./node_modules/.bin/mocha --compilers coffee:coffee-script -R spec I wish to pass additional options to the coffee-script compiler (--bare to avoid the outer closure that is introduced when compiling .coffee to .js). Is there a way to do this? I tried $ ./node_modules/.bin/mocha --compilers coffee:coffee-script --bare -R spec but that doesn't look right. It also failed saying that --bare is not a valid option for mocha. error: unknown option `--bare'

Convert image data to render an image in the browser

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问题 I am trying to download an encrypted image file from Amazon S3 through a presigned_link with AJAX, and is getting a bunch of image data gibberish. $(document).on 'click', '.js-download', (event) -> event.preventDefault() $.ajax type: "GET" url: event.currentTarget.href contentType: 'image/jpeg', headers: { 'x-amz-server-side-encryption-customer-algorithm': 'AES256', 'x-amz-server-side-encryption-customer-key': customer_key, 'x-amz-server-side-encryption-customer-key-MD5': customer_key_md5, }

rails, getting syntax error with coffee script

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问题 i am trying to do an autocomplete feature in rails using the jquery ui library. however i keep getting syntax errors "Syntax Error: reserved word "function" on line ..." this is my lessons.js.coffee file jQuery -> $(function() { function split( val ) { return val.split( /,\s*/ ); } function extractLast( term ) { return split( term ).pop(); } $( "#lesson_tag_name" ) // don't navigate away from the field on tab when selecting an item .bind( "keydown", function( event ) { if ( event.keyCode ===

Brunch how to disable RequireJS module wrapping

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问题 Update: For anyone interested in using Brunch with AngularJS I've put together a seed project angular-brunch-seed I'm using Brunch with AngularJS. AngularJS provides a module system so the need for importing file using commonJS / AMD is redundant. Is it possible to disable this feature for files in the /app directory? Essentially I would like it to compile files unaltered like it does for the /vendor directory. So the preferred out come would be: joinTo: 'js/app.js': /^app/ 'js/vendor.js': /