Usage

Once you have added SignumJS to your application you usually want to connect to one of the Signum Network nodes to interact with the blockchain.

All you need is to create an API instance to get access to the methods of the blockchain API.

The following example shows how to get an account from the chain.

index.js

const {composeApi} = require('@signumjs/core');

(async () => {
    const api = composeApi({
        nodeHost: 'https://europe.signum.network',
    });

    const account = await api.account.getAccount({accountId: '16107620026796983538'});
    console.log('Account', account);
})();

index.ts

import {composeApi} from '@signumjs/core';

(async (): Promise<void> => {
    const api = composeApi({
        nodeHost: 'https://europe.signum.network',
    });

    const account = await api.account.getAccount({accountId: '16107620026796983538'});
    console.log('Account', account);
})();

It is essential to understand the concept of async/await and Promises in Javascript. Many functions of SignumJS require to communicate with remote servers and therefore you need to be familiar with asynchronous Javascript.

Usage with bundles

When using the bundles imported via <script/>, you need to use the respective namespace to get access to the any of the functions within a module.

index.html

<html lang="en">
<head>
    <link rel="stylesheet" href="css/styles.css">
    <!-- Importing the bundles from the CDN -->
    <script type="application/javascript"
            src='https://cdn.jsdelivr.net/npm/@signumjs/core/dist/signumjs.min.js'></script>
</head>
<body>
    <!-- your body -->
    <script type="application/ecmascript" src="src/main.js"></script>
</body>

main.js

(async () => {
    // the 'namespace' of @signum/core is sig$
    const api = sig$.composeApi({
        nodeHost: 'https://europe.signum.network',
    });

    const account = await api.account.getAccount({accountId: '16107620026796983538'});
    console.log('Account', account);
})();

The modules are bundled using IIFE, to avoid global naming collisions with your application. Keep also in mind, that the bundles do not contain any type information, so your IDE cannot help you with auto-completion.

Each module of SignumJS comes with its own namespace

Module

Namespace

Example

core

sig$

const api = sig$.composeApi({
        nodeHost: 'https://europe.signum.network',
    });

contracts

sig$contracts

const dataView = new sig$contracts.ContractDataView(contract)

crypto

sig$crypto

const hash = sig$crypto.hashSHA256("test")

http

sig$http

const client = new sig$http.HttpClientFactory.createHttpClient('https://jsonplaceholder.typicode.com/');

monitor

sig$monitor

const monitor = new sig$monitor.Monitor<Account>({
    asyncFetcherFn: tryFetchAccount,
    compareFn: checkIfAccountExists,
    intervalSecs: 10, 
        key: 'monitor-account',
    timeoutSecs: 2 * 240 
})

util

sig$util

const value = sig$util.Amount.fromSigna("1000")

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Last updated 4 years ago