Question

141

ReferenceError: TextEncoder is not defined

rated 0 times [ 144] [ 3] / answers: 1 / hits: 129001 / 11 Years ago, thu, october 31, 2013, 12:00:00

I'm writing a simple addon in Firefox - 24, on Linux.
I get the error:

ReferenceError: TextEncoder is not defined

when I do: var encoder = new TextEncoder();
the function I'm using is:

function write_text(filename, text) {

    var encoder = new TextEncoder();

    var data = encoder.encode(text);

    Task.spawn(function() {

       let pfh =  OS.File.open(/tmp/foo, {append: true});

       yield pfh.write(text);

       yield pfh.flush();

       yield pfh.close(); 

    });

}

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answered 11 Years ago adrianobeds · Accepted Answer

Ah, you're using the SDK, I gather when re-reading the actual error of your other question.

You need to import TextEncoder explicitly from some other module, as SDK modules lack the class.

You need to yield OS.File.open.

append: is only supported in Firefox 27+

.flush() is only supported in Firefox 27+ (and a bad idea anyway). Use .writeAtomic if you need that.

You write: true to write to a file.

Here is a full, working example I tested in Firefox 25 (main.js)

const {Cu} = require(chrome);

// It is important to load TextEncoder like this using Cu.import()

// You cannot load it by just |Cu.import(resource://gre/modules/osfile.jsm);|

const {TextEncoder, OS} = Cu.import(resource://gre/modules/osfile.jsm, {});

const {Task} = Cu.import(resource://gre/modules/Task.jsm, {});



function write_text(filename, text) {

    var encoder = new TextEncoder();

    var data = encoder.encode(text);

    filename = OS.Path.join(OS.Constants.Path.tmpDir, filename);

    Task.spawn(function() {

       let file = yield OS.File.open(filename, {write: true});

       yield file.write(data);

       yield file.close(); 

       console.log(written to, filename);

    }).then(null, function(e) console.error(e));

}



write_text(foo, some text);