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javascriptnode.jsthisnode-red

Understanding a this._(STRING) call in node RED

I'm trying to understand existing code of the Switch node in node-red to deal with and make my own node correctly.

I'm stuck with these lines :

var operators = [
                {v:"eq",t:"=="},
                {v:"neq",t:"!="},
                {v:"lt",t:"<"},
                {v:"lte",t:"<="},
                {v:"gt",t:">"},
                {v:"gte",t:">="},
                {v:"btwn",t:this._("switch.rules.btwn")},
                {v:"cont",t:this._("switch.rules.cont")},
                {v:"regex",t:this._("switch.rules.regex")},
                {v:"true",t:this._("switch.rules.true")},
                {v:"false",t:this._("switch.rules.false")},
                {v:"null",t:this._("switch.rules.null")},
                {v:"nnull",t:this._("switch.rules.nnull")},
                {v:"else",t:this._("switch.rules.else")}
            ];

Especially with the this._("switch.rules.smthg"). How it will work ? Sometime in the code, i will see this call, but i'm not able to find where is it stored, and so make my own, like this._(myawesomenode.myawesomesection.myawesomepropertie)

EDIT

Thanks to your comments, i've seen it's for internationalisation.

Suppposing i have this catalog :

{
    "and": {
        "list": {
            "key": "THE DATA I WANT"
        }    
    }
}

How can i have my data ? I've tried something like this._(and.list.key) without result.

Solution

  • This is the function to pull in the translated version of a label.

    "switch.rules.btwn" is the key to look up the version of the label in the right language for the user.

    See the Internationalisation section of the Node-RED documentation for more details.