Editing JavaScriptMode

== JS mode (formerly Espresso) == For more general information on working with JavaScript in Emacs, see the JavaScript page. For a long while there was debate and back-and-forth about JavaScript support in Emacs. There were a number of different options, in various stages of maturity and completion. As of Emacs 23.2, there is a standard major mode for editing javascript: js-mode. It is derived and updated from Espresso-mode. Espresso-mode itself is a fork of Karl Landstrom's JavaScript mode (described below), but with additional features and robustness improvements. For the legacy page, see http://www.nongnu.org/espresso. For the current js-mode, just get a current Emacs (23.2 or later). If you have a back-rev of Emacs, see EmacsDevelopmentSources for how to get js-mode. js-mode includes: * Support for cc-mode's comment wrapping. * C preprocessor support -- yes, people use this with JavaScript. * Full suite of movement commands, including ##beginning-of-defun##, ##end-of-defun##, and so on. * Configurable recognition of class definitions. JavaScript, being a prototype-based language, has no "classes" per se, but there are constructions used to mean the same thing. * Hierarchical ##imenu## support using the aforementioned class definition recognition. In addition to recognizing top-level functions, ##imenu## will recognize methods. * Improved fontification of regular expression literals == JavaScript mode == Anything with the name "javascript-mode" or "javascript" is likely deprecated -- and decrepit. The following links are kept around for information, but if you are using JavaScript, you want js-mode or [[Js2Mode]]. Usually this name refers to Karl Landstrom's implementation: https://web.archive.org/web/20130313070358/http://www.karllandstrom.se/downloads/emacs/javascript.el Another obsolete implementation by Peter Kruse: https://web.archive.org/web/20190406114129/http://wal.sh/code/elisp/trunk/javascript-kruse.el The Mewde Project contain XEmacs' javascript mode while adding Mozilla Spider Monkey Project Javascript-Shell support. It works inside Emacs, but only primitively. == Fix for Greasemonkey scripts == The following fix from [[EmacsInitFileOfSylecn|Sylecn]] addresses a bug where the metadata block in Greasemonkey scripts confuses the syntax highlighter: (eval-after-load 'js '(progn (setq js--regexp-literal-fix "[^=][=(,:]\\(?:\\s-\\|\n\\)*\\(/\\)\\(?:\\\\.\\|[^/*\\]\\)\\(?:\\\\.\\|[^/\\]\\)*\\(/\\)") (setq js-font-lock-syntactic-keywords-fix ;; "|" means generic string fence `((,js--regexp-literal-fix (1 "|") (2 "|")))) (setq js-font-lock-syntactic-keywords js-font-lock-syntactic-keywords-fix))) ---- ProgrammingModes CategoryJavaScript

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