471 lines
13 KiB
HTML
471 lines
13 KiB
HTML
|
|
<!DOCTYPE HTML>
|
|
<html lang="" >
|
|
<head>
|
|
<meta charset="UTF-8">
|
|
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
|
|
<title>Simple connect · Polkadot API Book</title>
|
|
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
|
|
<meta name="description" content="">
|
|
<meta name="generator" content="GitBook 3.2.3">
|
|
|
|
|
|
|
|
|
|
<link rel="stylesheet" href="../../gitbook/style.css">
|
|
|
|
|
|
|
|
|
|
<link rel="stylesheet" href="../../gitbook/gitbook-plugin-highlight/website.css">
|
|
|
|
|
|
|
|
<link rel="stylesheet" href="../../gitbook/gitbook-plugin-search/search.css">
|
|
|
|
|
|
|
|
<link rel="stylesheet" href="../../gitbook/gitbook-plugin-fontsettings/website.css">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<meta name="HandheldFriendly" content="true"/>
|
|
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
|
|
<meta name="apple-mobile-web-app-capable" content="yes">
|
|
<meta name="apple-mobile-web-app-status-bar-style" content="black">
|
|
<link rel="apple-touch-icon-precomposed" sizes="152x152" href="../../gitbook/images/apple-touch-icon-precomposed-152.png">
|
|
<link rel="shortcut icon" href="../../gitbook/images/favicon.ico" type="image/x-icon">
|
|
|
|
|
|
<link rel="next" href="../02_listen_to_blocks/" />
|
|
|
|
|
|
<link rel="prev" href="../" />
|
|
|
|
|
|
</head>
|
|
<body>
|
|
|
|
<div class="book">
|
|
<div class="book-summary">
|
|
|
|
|
|
<div id="book-search-input" role="search">
|
|
<input type="text" placeholder="Type to search" />
|
|
</div>
|
|
|
|
|
|
<nav role="navigation">
|
|
|
|
|
|
|
|
<ul class="summary">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<li class="header">Packages</li>
|
|
|
|
|
|
|
|
<li class="chapter " data-level="1.1" data-path="../../">
|
|
|
|
<a href="../../">
|
|
|
|
|
|
Introduction
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1.2" data-path="../../api/">
|
|
|
|
<a href="../../api/">
|
|
|
|
|
|
api
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="1.2.1" data-path="../../api/classes/_index_.api.html">
|
|
|
|
<a href="../../api/classes/_index_.api.html">
|
|
|
|
|
|
Api
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1.3" data-path="../../api-provider/">
|
|
|
|
<a href="../../api-provider/">
|
|
|
|
|
|
api-provider
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="1.3.1" data-path="../../api-provider/classes/_http_index_.httpprovider.html">
|
|
|
|
<a href="../../api-provider/classes/_http_index_.httpprovider.html">
|
|
|
|
|
|
HttpProvider
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1.3.2" data-path="../../api-provider/classes/_ws_index_.wsprovider.html">
|
|
|
|
<a href="../../api-provider/classes/_ws_index_.wsprovider.html">
|
|
|
|
|
|
WsProvider
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="1.4" data-path="../../api-rx/">
|
|
|
|
<a href="../../api-rx/">
|
|
|
|
|
|
api-rx
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="1.4.1" data-path="../../api-rx/classes/_index_.rxapi.html">
|
|
|
|
<a href="../../api-rx/classes/_index_.rxapi.html">
|
|
|
|
|
|
ApiRx
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
<li class="header">Examples</li>
|
|
|
|
|
|
|
|
<li class="chapter " data-level="2.1" data-path="../">
|
|
|
|
<a href="../">
|
|
|
|
|
|
Overview
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter active" data-level="2.2" data-path="./">
|
|
|
|
<a href="./">
|
|
|
|
|
|
Simple connect
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.3" data-path="../02_listen_to_blocks/">
|
|
|
|
<a href="../02_listen_to_blocks/">
|
|
|
|
|
|
Listen to blocks
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.4" data-path="../03_listen_to_balance_change/">
|
|
|
|
<a href="../03_listen_to_balance_change/">
|
|
|
|
|
|
Listen to balance change
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.5" data-path="../04_generate_account/">
|
|
|
|
<a href="../04_generate_account/">
|
|
|
|
|
|
Generate Accounts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.6" data-path="../05_read_storage/">
|
|
|
|
<a href="../05_read_storage/">
|
|
|
|
|
|
Read Storage
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.7" data-path="../06_craft_extrinsic/">
|
|
|
|
<a href="../06_craft_extrinsic/">
|
|
|
|
|
|
Craft Extrinsic
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="2.8" data-path="../07_transfer_dots/">
|
|
|
|
<a href="../07_transfer_dots/">
|
|
|
|
|
|
Transfer DOTs
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
<li class="divider"></li>
|
|
|
|
<li>
|
|
<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
|
|
Published with GitBook
|
|
</a>
|
|
</li>
|
|
</ul>
|
|
|
|
|
|
</nav>
|
|
|
|
|
|
</div>
|
|
|
|
<div class="book-body">
|
|
|
|
<div class="body-inner">
|
|
|
|
|
|
|
|
<div class="book-header" role="navigation">
|
|
|
|
|
|
<!-- Title -->
|
|
<h1>
|
|
<i class="fa fa-circle-o-notch fa-spin"></i>
|
|
<a href="../.." >Simple connect</a>
|
|
</h1>
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div class="page-wrapper" tabindex="-1" role="main">
|
|
<div class="page-inner">
|
|
|
|
<div id="book-search-results">
|
|
<div class="search-noresults">
|
|
|
|
<section class="normal markdown-section">
|
|
|
|
<h1 id="simple-connect">Simple Connect</h1>
|
|
<p>The following example shows how to instantiate a Polkadot API object and use it to connect to a node.</p>
|
|
<pre><code class="lang-javascript"><span class="hljs-keyword">const</span> Api = <span class="hljs-built_in">require</span>(<span class="hljs-string">'@polkadot/api'</span>).default
|
|
<span class="hljs-keyword">const</span> WsProvider = <span class="hljs-built_in">require</span>(<span class="hljs-string">'@polkadot/api-provider/ws'</span>).default
|
|
<span class="hljs-keyword">const</span> provider = <span class="hljs-keyword">new</span> WsProvider(<span class="hljs-string">'ws://127.0.0.1:9944'</span>)
|
|
<span class="hljs-keyword">const</span> api = <span class="hljs-keyword">new</span> Api(provider)
|
|
|
|
<span class="hljs-keyword">async</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getChain</span> (<span class="hljs-params"></span>) </span>{
|
|
<span class="hljs-keyword">return</span> api.system.chain()
|
|
}
|
|
|
|
<span class="hljs-keyword">async</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">main</span> (<span class="hljs-params"></span>) </span>{
|
|
<span class="hljs-keyword">const</span> chain = <span class="hljs-keyword">await</span> getChain()
|
|
|
|
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">'You are connected to chain:'</span>, chain)
|
|
}
|
|
|
|
main().finally(_ => process.exit())
|
|
</code></pre>
|
|
|
|
|
|
</section>
|
|
|
|
</div>
|
|
<div class="search-results">
|
|
<div class="has-results">
|
|
|
|
<h1 class="search-results-title"><span class='search-results-count'></span> results matching "<span class='search-query'></span>"</h1>
|
|
<ul class="search-results-list"></ul>
|
|
|
|
</div>
|
|
<div class="no-results">
|
|
|
|
<h1 class="search-results-title">No results matching "<span class='search-query'></span>"</h1>
|
|
|
|
</div>
|
|
</div>
|
|
</div>
|
|
|
|
</div>
|
|
</div>
|
|
|
|
</div>
|
|
|
|
|
|
|
|
<a href="../" class="navigation navigation-prev " aria-label="Previous page: Overview">
|
|
<i class="fa fa-angle-left"></i>
|
|
</a>
|
|
|
|
|
|
<a href="../02_listen_to_blocks/" class="navigation navigation-next " aria-label="Next page: Listen to blocks">
|
|
<i class="fa fa-angle-right"></i>
|
|
</a>
|
|
|
|
|
|
|
|
</div>
|
|
|
|
<script>
|
|
var gitbook = gitbook || [];
|
|
gitbook.push(function() {
|
|
gitbook.page.hasChanged({"page":{"title":"Simple connect","level":"2.2","depth":1,"next":{"title":"Listen to blocks","level":"2.3","depth":1,"path":"examples/02_listen_to_blocks/README.md","ref":"examples/02_listen_to_blocks/README.md","articles":[]},"previous":{"title":"Overview","level":"2.1","depth":1,"path":"examples/README.md","ref":"examples/README.md","articles":[]},"dir":"ltr"},"config":{"plugins":["include-codeblock"],"root":"docs","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"include-codeblock":{"check":false,"edit":false,"lang":"","fixlang":false,"template":"default","theme":"chrome","unindent":false},"highlight":{},"search":{},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"fontsettings":{"theme":"white","family":"sans","size":2},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"Polkadot API Book","gitbook":">=2.4.0"},"file":{"path":"examples/01_simple_connect/README.md","mtime":"2018-09-21T08:16:07.475Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2018-09-21T08:20:14.104Z"},"basePath":"../..","book":{"language":""}});
|
|
});
|
|
</script>
|
|
</div>
|
|
|
|
|
|
<script src="../../gitbook/gitbook.js"></script>
|
|
<script src="../../gitbook/theme.js"></script>
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-search/search-engine.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-search/search.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-lunr/lunr.min.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-lunr/search-lunr.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-sharing/buttons.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|
|
|