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Integration Guide (ePad-vision SDK for Chrome & Firefox)

7.0 – Chrome Integration

The Native Messaging Host (NMH) is the critical component of the ePad-vision SDK and Chrome

allows access to NMH in web pages via extensions. Integration into a web page requires a background

extension that acts as a bridge between the web page and the native messaging host application.

The following sections explain installation of NMH, writing extensions for NMH access, installation of

extension, and API access

7.1 – Creating an Extension

The first step of the extension is to write the manifest file. Below is the sample manifest.json file of the

ChromeExtension of the SDK.

{

"name": "ePad-vision SDK Chrome Sample Extension",

"version": "1.0",

"manifest_version": 2,

"background": {

"scripts": ["background.js"],

"persistent": false

"content_scripts": [{

"matches": ["http://*/*", “<all_urls>"],

"js": ["content.js"]

}],

"permissions" : ["nativeMessaging","activeTab","tabs","<all_urls>"]

}

Parameter

Description

Name

Name of the extension

Version

Version of the extension

Manifest_version

Version of the manifest.

Background

This section specifies the information about the JS file which has the

reference of the extension background JS file. This file will have all the

code for communication with Chrome Native Messaging Host.

Persistent specifies if the extension background js is an event page or

not. Specifying false will make the JavaScript page load when the

specific event happens. We suggest you to keep this the same.

Content_Scripts

This section has information related to the script file which gets injected

into the web page. Content script code registers for an event which web

page raises, and when the event is raised, it invokes the background

script for NMH communication.

The matches attribute specifies the application URLs into which the

content script should be injected.

Js: content java script file.

Permissions

List of permissions the extension requires for communicating with the

device.

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