JavaScript: JSLint throws "Read Only

Question

My code:
note: the Slider Object is declared but omitted in the snippet below for better readability

"use strict"; /*global arrayContainer, SliderInstance, DomObjects */ arrayContainer = new Slider.constructArray(); SliderInstance = Object.beget(Slider); DomObjects = { animationContainer: document.getElementById('animationContainer'), buttonRight: document.getElementById('buttonRight'), buttonRightDots: document.getElementById('buttonRightDots'), ieEffectImg: document.getElementById('ie_effectIMG') };

This is what JSLint produces (and on the other two Objects SliderInstance and DomObjects)

Error: Problem at line 3 character 1: Read only. arrayContainer = new Slider.constructArray(); Problem at line 3 character 1: Stopping. (27% scanned).

How do I satisfy JSLint's requirements? What does "Read only." mean?

glebm · Accepted Answer · 2014-06-18 22:15:47Z

49

Try this:

 /*global arrayContainer:true, SliderInstance:true, DomObjects:true, document, Slider*/

Informs JSLint that these globals are assigned intentionally.

edited Jun 18, 2014 at 22:15

answered Sep 13, 2010 at 23:09

glebm

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4 Comments

Cloudscape Germany Over a year ago

You've got a keen eye and good understanding of JSLint. That worked nicely. JSLint Docs say: "Each name can optionally be followed by a colon and either true or false, true indicated that the variable may be assigned to by this file, and false indicating that assignment is not allowed which is the default." Some interesting questions arise out of this answer. 1) Why doesn't it matter what boolean I assign to the global document object? And more importantly: 2) Why does JSLint or JavaScript care about -where- I assign global objects?

glebm Over a year ago

Oh, this is to avoid assigning global object by accident (e.g. forgetting the var keyword and writing document = $('#attachment_document')

glebm Over a year ago

Also, JavaScript itself does not care where you assign those, only JSLint does.

rob Over a year ago

FYI make sure there is no space after /* or before the closing */, spent ages trying to work out why the directive was not being used.

Luke Schafer · Accepted Answer · 2010-09-13 23:11:51Z

use

/*global arrayContainer:true, SliderInstance:true, DomObjects:true */

see doco under 'Global Variables' - the 'true' says that this file can assign to those variables.

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