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Building a Web Application with JavaScript and IndexedDB

Creating a Cursor for the Object Store

Explore how to create and use a cursor in IndexedDB to efficiently iterate over records in an object store. Understand the openCursor() method, its parameters, and how to handle cursor events to access or manipulate data sequentially within a web application.

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The openCursor() method

The openCursor() method is used to open a cursor across one of the object stores in an IndexedDB database. It allows us to iterate over the records in the store, searching for a specific key or range of keys.

Syntax

openCursor()
openCursor(query)
openCursor(query, direction)
Syntax of the openCursor() method

The openCursor() method has two optional parameters that can be used to specify the cursor options:

  • query: This parameter specifies the key or the key rangeRange of keys from 1–5. to use for the cursor. If nothing is passed then the cursor will be opened for all the data in the object store.

  • ...