IDBVersionChangeEvent.md

IDBVersionChangeEvent

Namespace: SpawnDev.SpawnJS.JSObjects
Inherits: Event<IDBOpenDBRequest>
Source: JSObjects/IDBVersionChangeEvent.cs
MDN Reference: IDBVersionChangeEvent on MDN

The IDBVersionChangeEvent interface of the IndexedDB API indicates that the version of the database has changed, as the result of an onupgradeneeded event handler function. https://developer.mozilla.org/en-US/docs/Web/API/IDBVersionChangeEvent

Constructors

Signature	Description
IDBVersionChangeEvent(SpawnJSObjectReference _ref)	Deserialization constructor

Properties

Property	Type	Access	Description
OldVersion	long	get	The oldVersion read-only property of the IDBVersionChangeEvent interface returns the old version number of the database. A number containing a 64-bit integer.
NewVersion	long?	get	The newVersion read-only property of the IDBVersionChangeEvent interface returns the new version number of the database. A number that is a 64-bit integer or null if the database is being deleted.

Examples

SpawnDev.SpawnJS Mapping Note: The JavaScript examples below show the standard Web API usage. In SpawnDev.SpawnJS, the same API is available with C# conventions:

• Properties and methods use PascalCase (e.g., readyState becomes ReadyState)
• Events use ActionEvent with +=/-= (e.g., addEventListener("click", fn) becomes OnClick += handler)
• Async methods return Task<T> instead of Promise<T>
• Objects should be disposed with using statements
• Access via JS.Get<IDBVersionChangeEvent>(...) or constructor new IDBVersionChangeEvent(...)

const note = document.querySelector("ul");

// Let us open version 4 of our database
const DBOpenRequest = window.indexedDB.open("toDoList", 4);

// these two event handlers act on the database being opened successfully, or not
DBOpenRequest.onerror = (event) => {
  note.appendChild(document.createElement("li")).textContent =
    "Error loading database.";
};

DBOpenRequest.onsuccess = (event) => {
  note.appendChild(document.createElement("li")).textContent =
    "Database initialized.";

  // store the result of opening the database in the db variable. This is used a lot later on, for opening transactions and suchlike.
  const db = DBOpenRequest.result;
};

See full example on MDN