js(9)

SYNOPSIS

js - Javascript programming language

FILES

hkjs.emf - Javascript programming language hook definition
js.eaf - Javascript programming language abbreviation file
js.etf - Javascript programming language template file

EXTENSIONS

.js - Javascript language file

DESCRIPTION

The js file type templates share much with the c(9) template definitions, utilising the electric 'C' features for automatic layout of text.

General Editing


On creating a new file, a new header is automatically included into the file. time(2m) is by default enabled, allowing the modification time-stamp to be maintained in the header.

Hilighting


The hilighting features allow commands, variables, logical, preprocessor definitions, comments, strings and characters of the language to be differentiated and rendered in different colors.

Auto Layout


The C-Mode indent(2) performs automatic layout of the text.

restyle-region(3) and restyle-buffer(3) are available to reformat (re-layout) selected sections of the buffer, or the whole buffer, respectively.

Comments may be formatted using esc o, which reformats the comments according to the current fill paragraph. If a comment commences with /***... then the comment is automatically formatted to a box.

Folding and Information Hiding


Generic folding is enabled within the Javascrip file. The folds occur about functions defined with the function keyword and a closing curly brace both at the beginning of a line. collapse-all(3) (un)folds all regions in the file, collapse-current(3) (un)folds the current region.

Navigation via Item List


The Javascript offers beside folding as well support for displaying an outline of the functions and classes of the Javascript file for easy navigation using the item-list(3) command.

Abbreviations


The installation comes with a default abbreviation file for Javascript language file editing which can be used by writing short abbreviations like "for", "if", "elif" (else if) or "func" (function) - and then pressing the key-binding for the expand-abbrev-handle(3) command. The list of abbreviations can be used interactively in the GUI version of MicroEmacs using the abbrev-list(3) command.

List Items


Item listing is available and the key constructs of the file may be listed in the item-list.

Tags


A C-tags file may be generated within the editor using the Tools -> Javascript-Tools -> Generate Tag File. find-tag(2) takes the user to the file using the tag information.

Short Cuts


The short cut keys used within the buffer are:

C-c C-c - Comment out the current line.
C-c C-d - Uncomment the current line.
C-c C-e - Comment to the end of the line with stars (*).
A-C-i - Restyle the current region.
esc q - Format a comment.
esc o - Format a comment.
f2 - (Un)fold the current region.
C-f2 - (Un)fold all regions.
f6 - List items.
esc f6 - Close item list,

NOTES

The hilighting or the addition of new item list matches is typically extended using a file myjs.emf.

SEE ALSO

abbrev-list(3), c(9), collapse-all(3), collapse-current(3), expand-abbrev-handle(3), find-tag(2), item-list(3), jstags(3f), restyle-buffer(3), restyle-region(3), time(2m).

Supported File Types

Ref: js(9) File: m9typ055.9 Date: 2026/02/24

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