NDEFReader.write() - Web APIs 编辑

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Secure context

This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The write() method of NDEFReader interface writes a specified message to a compatiable NFC tag.

Syntax

var sessionPromise = NDEFReader.write(message, options);

Parameters

 message

The message to be written, either DOMString or BufferSource or NDEFMessageInit.

options Optional

• ignoreRead -- Boolean specifying whether or not to skip reading for the activated reader objects. Will be ignored if overwrite is false.
• overwrite -- Boolean specifying whether or not existing record should be overwritten, if such exists.
• signal -- optional AbortSignal that allows to cancell this write operation.

Return value

A Promise that resolves with undefined when and if the message transfer is successfully completed.

Exceptions

This method doesn't throw true exceptions; instead, it rejects the returned promise, passing into it a DOMException whose name is one of the following:

AbortError

The write operation was aborted with AbortSignal passed in options.

NotAllowedError

The permission for this operation was rejected or overwrite is false and there are already records on the tag.

NotSupportedError

There is no NFC adapter compatible with Web NFC, or the available NFC adapter does not support pushing messages, or connection can not be established.

NotReadableError

The UA is not allowed to access underlying NFC adapter (e.g., due to user preference).

NetworkError

Transfer failed after it already started (e.g., the tag was removed from the reader).

Specifications