Deleting objects

Deleting objects is pretty similar to retrieving them using get, only we use delete instead.

Note

The snippets in this section are located at snippets/07/ex6-delete-objects/* in the code package of this book. When using the interactive snippet playground, select 7: IndexedDB and examples 6a and 6b.

Let's take a look at an example:

// Example Snippet 6a
let req = db.transaction(["definition"],"readwrite").objectStore("definition").delete("02124272");
req.onerror = function (evt) {
  console.log("[DB] An error occurred: ", evt.target.error);
};
req.onsuccess = function () {
  console.log("Deleted the entry.");
};

It's important to note that the success event will be called even if the object couldn't be found in order to be deleted. If some other error does occur, error will be fired instead.

Let's see Treo's version:

// Example Snippet 6b
let definitionStore = db.store("definition");
definitionStore.del("02124272")
  .then(() => console.log("Entry deleted."))
  .catch((err) ...