Having trouble invoking a method in a TypeScript class: Error message indicating the method is not present in the object

It's driving me crazy, but I can't seem to figure out why my ResetDB method is unable to call the InitializeDB method when the ResetDB button is clicked by the user. The ResetDB method gets triggered successfully with the button click, but things go awry after that:

var md: ManageCustOrderDatabase;

$(function () {
  md = new ManageCustOrderDatabase();

  $("#ResetDb").click(md.ResetDB);
});

class ManageCustOrderDatabase {
  public ResetDB() {
    alert("A");
    this.InitializeDB();
    alert("C");
  }

  public InitializeDB() {
    alert("q");        
  }
}

Answer №1

Your approach lacks the correct reference to this because it is not invoked directly like: md.ResetDB(), but rather passed and executed later in a different scope.

You have a couple of options to address this issue:

$("#ResetDb").click(md.ResetDB.bind(md));

Alternatively, you can utilize Arrow functions like so:

$("#ResetDb").click(() => md.ResetDB());

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