how to get browser language via script include or function call

[Eleven_TW]

gs.getSession().getLanguage() will retrieve current session pre-defined language but I want to get browser langugage/language code as kind of backup.

navigator.language || navigator.userLanguage seems like not working since it will show error of navigator is not defined.

also tried to create a new class of script include, but seems like not working either as following:

var BrowserLocaleUtil = Class.create();
BrowserLocaleUtil.prototype = {
    initialize: function() {},

    getBrowserLocale: function(request) {
    var acceptLanguage = request.getHeader('Accept-Language');

    if (acceptLanguage) {
        var languageTag = acceptLanguage.split(',')[0];

        return languageTag;
    } else {
        return 'en';
    }
},

type: 'BrowserLocaleUtil'
};

and call in other script
var browserLocaleUtil = new BrowserLocaleUtil();

var browserLocale = browserLocaleUtil.getBrowserLocale(current.request);

Please help any JavaScript functions to retrieve the browser language code since there is potential missing from either service now user table or current session language set.

[Eleven_TW]

Hi -O-,

Thank you so much for your details.

Everything works fine in background script, I can get locale using the following:

var acceptLanguage = GlideTransaction.get().getRequest().getHeader('Accept-Language');

var locale = acceptLanguage.split(',').shift();

gs.info(acceptLanguage);

=> 

*** Script: en-US,en;q=0.9

But after I created global script include as attached screenshot

and call it in my application script include via:

var browserUtils = new global.BrowserUtils();
var expectedLocale =  browserUtils.getBrowserLocale();

It shows error:

*** Script: Falied to get browser locale {"message":"Cannot convert null to an object.","rhinoException":{}}: no thrown error

Thanks in advance for your help!

[Eleven_TW]

Hi János,

Thank you so much for your details.

When I run it in background script, everything works fine and I can get the following result:

1. running in Global scope with following:

var acceptLanguage= GlideTransaction.get().getRequest().getHeader('Accept-Language');
var languageTag = acceptLanguage.split(',').shift();

gs.log("acceptLanguage " + acceptLanguage);

=>

*** Script: acceptLanguage en-US,en;q=0.9

2. running in my application scope to call the global script include:

var utils = new global.BrowserUtils();

var language = utils.getBrowserLocale();

gs.info(language);

=>

en-US

But when I call in my application scope script include, it always fails with error

"message":"Cannot convert null to an object."

because GlideTransaction.get().getRequest() is always null

do you know the possible root cause?

Thank you so much in advance!

[-O-]

What exactly triggers the scoped Script Include that calls the global Script Include?

I mean not every process/transaction in ServiceNow has an associated request.

Perhaps that is what is going on here.

In any case I would re-write the Script Include to account for the possibility that any of the methods returned invalid result, something like:

var BrowserLocaleUtil = Class.create();

BrowserLocaleUtil.pipe = function (rv, fn) {
	return rv == null ? undefined : fn(rv);
};

BrowserLocaleUtil.prototype = {

	'initialize': function () {

	},

	'getBrowserLocale': function () {
		return this._getAcceptLanguage() || this._getDefaultLanguage();
	},

	'type': 'BrowserLocaleUtil',

	'_getAcceptLanguage': function () {
		return [
			this._getGlideTransaction,
			this._getGlideTransactionRequest,
			this._getGlideTransactionRequestHeader('Accept-Language'),
			this._getBaseLanguageTag
		].reduce(BrowserLocaleUtil.pipe, {});
	},

	'_getBaseLanguageTag': function (data) {
		return String(data).trim().split(/\s*,\s*/g).shift();
	},

	'_getDefaultLanguage': function () {
		return '' + gs.getProperty('glide.sys.language', 'en');
	},

	'_getGlideTransaction': function () {
		return GlideTransaction.get();
	},

	'_getGlideTransactionRequest': function (data) {
		return data.getRequest();
	},

	'_getGlideTransactionRequestHeader': function (headerName) {
		return function (data) {
			return data.getHeader(headerName);
		};
	},

};

This is necessary because other than the above mentioned situation (there is no request in the transaction) even your script (but this one too) can be called from Scripts - Background both while running in global scope or in a private scope.