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Sending one-off messages can get cumbersome if you are exchanging a lot of messages between a background script and a content script. If a content script needs to use a JavaScript library, then the library itself should be injected as a content script alongside the content script that wants to use it: So, for example, if the page includes jQuery, the content script can't see it. One practical consequence of this behavior is that a content script doesn't have access to any JavaScript libraries loaded by the page. This means that content scripts can rely on DOM properties behaving predictably, without worrying about its variables clashing with variables from the page script. The same is true in reverse page scripts cannot see JavaScript properties added by content scripts. confirm ( 'Are you sure?' ) // calls the original nfirm() foo ) // undefined // sees the original form of redefined properties backgroundColor = 'blue' // can't see properties added by page-script.jsĬonsole. content-script.js // can access and modify the DOM let pageScriptPara = document. Using method (3), you can also load scripts into pages packaged with your extension, but you can't load scripts into privileged browser pages (like ' about:debugging' or ' about:addons'). Using methods (1) and (2), you can only load scripts into pages whose URLs can be represented using a match pattern. This means that variables from one content script can directly be accessed by another content script, regardless of how the content script was loaded. There is only one global scope per frame, per extension. (For example, in response to the user clicking on a browser action.) In Manifest V2, using tabs.executeScript(), or Manifest V3, using scripting.executeScript(), you can load a content script into a specific tab whenever you want.

(This is similar to method 1, except that you can add and remove content scripts at runtime.) Using the contentScripts API, you can ask the browser to load a content script whenever the browser loads a page whose URL matches a given pattern.

At runtime, into pages that match URL patterns.

Using the content_scripts key in your manifest.json, you can ask the browser to load a content script whenever the browser loads a page whose URL matches a given pattern.

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At install time, into pages that match URL patterns.

You can load a content script into a web page in one of three ways:

Differences between API implementations.

coffee files anywhere:ĬoffeeScript on the top left, compiled JavaScript output on the bottom right. Latest Version: 2.7.0 # Install locally for a project: The compiled output is readable, pretty-printed, and tends to run as fast or faster than the equivalent handwritten JavaScript. You can use any existing JavaScript library seamlessly from CoffeeScript (and vice-versa).

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The golden rule of CoffeeScript is: “It’s just JavaScript.” The code compiles one-to-one into the equivalent JS, and there is no interpretation at runtime. CoffeeScript is an attempt to expose the good parts of JavaScript in a simple way. Underneath that awkward Java-esque patina, JavaScript has always had a gorgeous heart.

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Try CoffeeScript Introduction Overview CoffeeScript 2 What’s New in CoffeeScript 2 Compatibility Installation Usage Command Line Node.js Transpilation Language Reference Functions Strings Objects and Arrays Comments Lexical Scoping and Variable Safety If, Else, Unless, and Conditional Assignment Splats, or Rest Parameters/Spread Syntax Loops and Comprehensions Array Slicing and Splicing Everything is an Expression Operators and Aliases Existential Operator Destructuring Assignment Chaining Function Calls Bound (Fat Arrow) Functions Generator Functions Async Functions Classes Prototypal Inheritance Switch/When/Else Try/Catch/Finally Chained Comparisons Block Regular Expressions Tagged Template Literals Modules Embedded JavaScript JSX Type Annotations Literate CoffeeScript Source Maps Cake, and Cakefiles 'text/coffeescript' Script Tags Integrations Build Tools Code Editors Frameworks Linters and Formatting Testing Resources Books Screencasts Examples Chat Annotated Source Contributing GitHub Unsupported ECMAScript Features let and const Named Functions and Function Declarations get and set Shorthand Syntax Breaking Changes From 1.x Bound (Fat Arrow) Functions Default Values Bound Generator Functions Classes super and this super and extends JSX and the Operators Literate CoffeeScript Parsing Argument Parsing and #! Lines Changelog Browser-Based Tests Version 1.x DocumentationĬoffeeScript is a little language that compiles into JavaScript.