Cannot get "this" from callback

@alexmehler wrote:

Hey guys, im grinding my teeth here lol

i load a json with

readJSON(filename) {

this.file.readAsText(this.file.externalRootDirectory + "xtracker", filename).then(() => this.successCallback, this.failureCallback);

}

but in

successCallback(result) { console.log(this)};

ig get undefined , means i cannot fill the variable for my ngfor list, this.clients

i tried some hacks like ()=> but to no avail

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