115 lines
30 KiB
HTML
115 lines
30 KiB
HTML
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<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></div> <!----></nav> <ul class="sidebar-links"><li><a href="/" class="sidebar-link">Home</a></li><li><a href="/how-it-works.html" class="sidebar-link">How it works?</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/getting-started.html" class="sidebar-link">Getting Started</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/getting-started.html#installation" class="sidebar-link">Installation</a></li><li class="sidebar-sub-header"><a href="/getting-started.html#importing-the-library" class="sidebar-link">Importing the library</a></li><li class="sidebar-sub-header"><a href="/getting-started.html#connecting-to-a-web3-provider" class="sidebar-link">Connecting to a web3 provider</a></li><li class="sidebar-sub-header"><a href="/getting-started.html#reacting-to-data" class="sidebar-link">Reacting to data</a></li><li class="sidebar-sub-header"><a href="/getting-started.html#tracking-state" class="sidebar-link">Tracking state</a></li><li class="sidebar-sub-header"><a href="/getting-started.html#tracking-events" class="sidebar-link">Tracking events</a></li><li class="sidebar-sub-header"><a href="/getting-started.html#tracking-balances" class="sidebar-link">Tracking balances</a></li><li class="sidebar-sub-header"><a href="/getting-started.html#subscriptions" class="sidebar-link">Subscriptions</a></li><li class="sidebar-sub-header"><a href="/getting-started.html#cleanup" class="sidebar-link">Cleanup</a></li></ul></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>Integrations</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/integrations-overview.html" class="sidebar-link">Overview</a></li><li><a href="/react.html" class="active sidebar-link">React</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/vue.html" class="sidebar-link">Vue</a><ul class="sidebar-sub-headers"></ul></li><li><section class="sidebar-group is-sub-group depth-1"><p class="sidebar-heading"><span>Redux</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/redux.html" class="sidebar-link">redux</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/redux-observable.html" class="sidebar-link">redux-observable</a></li></ul></section></li><li><a href="/reactive-graphql.html" class="sidebar-link">reactive-graphql</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/apollo-client.html" class="sidebar-link">apollo-client</a><ul class="sidebar-sub-headers"></ul></li></ul></section></li><li><a href="/tutorial.html" class="sidebar-link">Tutorial</a></li><li><a href="/api.html" class="sidebar-link">API</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/api.html#general" class="sidebar-link">General</a></li><li class="sidebar-sub-header"><a href="/api.html#contract-methods" class="sidebar-link">Contract methods</a></li><li class="sidebar-sub-header"><a href="/api.html#low-level-api-for-data-tracking" class="sidebar-link">Low level API for data tracking</a></li></ul></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="react"><a href="#react" aria-hidden="true" class="header-anchor">#</a> React</h1> <p>We provide a higher-order component to connect to enhance presentational components to react to any observable (not limited to those generated by <strong>Subspace</strong>).</p> <h3 id="usage"><a href="#usage" aria-hidden="true" class="header-anchor">#</a> Usage</h3> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> observe <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'@embarklabs/subspace/react'</span><span class="token punctuation">;</span>
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<span class="token keyword">const</span> ObserverComponent <span class="token operator">=</span> <span class="token function">observe</span><span class="token punctuation">(</span>WrappedComponent<span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>This enhanced component will subscribe to any observable property it receives when the component is mounted and automatically unsubscribe when the component is unmounted.</p> <h3 id="example"><a href="#example" aria-hidden="true" class="header-anchor">#</a> Example</h3> <div class="tip custom-block"><p>This example is available in <a href="https://github.com/embark-framework/subspace/tree/master/examples/react-example1" target="_blank" rel="noopener noreferrer">Github<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></p></div> <h4 id="mycomponentobserver-js"><a href="#mycomponentobserver-js" aria-hidden="true" class="header-anchor">#</a> MyComponentObserver.js</h4> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">import</span> React <span class="token keyword">from</span> <span class="token string">"react"</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> ReactDOM <span class="token keyword">from</span> <span class="token string">'react-dom'</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> <span class="token punctuation">{</span>observe<span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">"@embarklabs/subspace/react"</span><span class="token punctuation">;</span>
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<span class="token keyword">const</span> <span class="token function-variable function">MyComponent</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">{</span>eventData<span class="token punctuation">}</span></span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token comment">// Handle initial state when no data is available</span>
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<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>eventData<span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token operator"><</span>p<span class="token operator">></span>No data<span class="token operator"><</span><span class="token operator">/</span>p<span class="token operator">></span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">return</span> <span class="token operator"><</span>p<span class="token operator">></span><span class="token punctuation">{</span>eventData<span class="token punctuation">.</span>someReturnedValue<span class="token punctuation">}</span><span class="token operator"><</span><span class="token operator">/</span>p<span class="token operator">></span>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
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<span class="token comment">// MyComponent will now observe any observable prop it receives</span>
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<span class="token comment">// and update its state whenever the observable emits an event</span>
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<span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token function">observe</span><span class="token punctuation">(</span>MyComponent<span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br></div></div><h4 id="app-js"><a href="#app-js" aria-hidden="true" class="header-anchor">#</a> App.js</h4> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">import</span> React<span class="token punctuation">,</span> <span class="token punctuation">{</span>Component<span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'react'</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> ReactDOM <span class="token keyword">from</span> <span class="token string">'react-dom'</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> Subspace <span class="token keyword">from</span> <span class="token string">'@embarklabs/subspace'</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> MyComponentObserver <span class="token keyword">from</span> <span class="token string">'./MyComponentObserver'</span><span class="token punctuation">;</span>
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<span class="token keyword">class</span> <span class="token class-name">App</span> <span class="token keyword">extends</span> <span class="token class-name">Component</span> <span class="token punctuation">{</span>
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state <span class="token operator">=</span> <span class="token punctuation">{</span>
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myEventObservable$<span class="token punctuation">:</span> <span class="token keyword">null</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">async</span> <span class="token function">componentDidMount</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">const</span> MyContractInstance <span class="token operator">=</span> <span class="token operator">...</span><span class="token punctuation">;</span> <span class="token comment">// TODO: obtain a web3.eth.contract instance</span>
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<span class="token keyword">const</span> subspace <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Subspace</span><span class="token punctuation">(</span><span class="token string">"wss://localhost:8545"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// Use a valid provider (geth, parity, infura...)</span>
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<span class="token keyword">await</span> subspace<span class="token punctuation">.</span><span class="token function">init</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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<span class="token keyword">const</span> myEventObservable$ <span class="token operator">=</span> subspace<span class="token punctuation">.</span><span class="token function">trackEvent</span><span class="token punctuation">(</span>MyContractInstance<span class="token punctuation">,</span> <span class="token string">"MyEvent"</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>filter<span class="token punctuation">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span> fromBlock<span class="token punctuation">:</span> <span class="token number">1</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">setState</span><span class="token punctuation">(</span><span class="token punctuation">{</span> myEventObservable$ <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token function">render</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token operator"><</span>MyComponentObserver eventData<span class="token operator">=</span><span class="token punctuation">{</span><span class="token keyword">this</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>myEventObservable$<span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token punctuation">}</span>
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<span class="token keyword">export</span> <span class="token keyword">default</span> App<span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br></div></div><div class="warning custom-block"><p class="custom-block-title">Handling Contract Objects</p> <p>The variable <code>MyContractInstance</code> is a <code>web3.eth.Contract</code> object pointing to a deployed contract address. You can use a DApp framework like <a href="https://embark.status.im/docs/contracts_javascript.html" target="_blank" rel="noopener noreferrer">Embark<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a> to easily import that contract instance: <code>import { MyContract } from './embarkArtifacts/contracts';</code>, or use web3.js directly (just like in the example <a href="https://github.com/status-im/subspace/blob/master/examples/react/src/MyContract.js#L36-L42" target="_blank" rel="noopener noreferrer">source code<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a>)</p></div> <h4 id="index-js"><a href="#index-js" aria-hidden="true" class="header-anchor">#</a> index.js</h4> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">import</span> React <span class="token keyword">from</span> <span class="token string">'react'</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> ReactDOM <span class="token keyword">from</span> <span class="token string">'react-dom'</span><span class="token punctuation">;</span>
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<span class="token keyword">import</span> App <span class="token keyword">from</span> <span class="token string">'./App'</span><span class="token punctuation">;</span>
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ReactDOM<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span><span class="token operator"><</span>App <span class="token operator">/</span><span class="token operator">></span><span class="token punctuation">,</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'root'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">import</span> <span class="token punctuation">{</span> observe <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">"@embarklabs/subspace/react"</span><span class="token punctuation">;</span>
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<span class="token keyword">const</span> <span class="token function-variable function">ProductComponent</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token punctuation">{</span> maxRating<span class="token punctuation">,</span> minRating<span class="token punctuation">,</span> averageRating <span class="token punctuation">}</span></span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token operator"><</span>ul<span class="token operator">></span>
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<span class="token operator"><</span>li<span class="token operator">></span><span class="token operator"><</span>b<span class="token operator">></span>minimum rating<span class="token punctuation">:</span> <span class="token operator"><</span><span class="token operator">/</span>b<span class="token operator">></span> <span class="token punctuation">{</span>minRating<span class="token punctuation">}</span><span class="token operator"><</span><span class="token operator">/</span>li<span class="token operator">></span>
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<span class="token operator"><</span>li<span class="token operator">></span><span class="token operator"><</span>b<span class="token operator">></span>maximum rating<span class="token punctuation">:</span> <span class="token operator"><</span><span class="token operator">/</span>b<span class="token operator">></span> <span class="token punctuation">{</span>maxRating<span class="token punctuation">}</span><span class="token operator"><</span><span class="token operator">/</span>li<span class="token operator">></span>
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<span class="token operator"><</span>li<span class="token operator">></span><span class="token operator"><</span>b<span class="token operator">></span>average rating<span class="token punctuation">:</span> <span class="token operator"><</span><span class="token operator">/</span>b<span class="token operator">></span> <span class="token punctuation">{</span>averageRating<span class="token punctuation">}</span><span class="token operator"><</span><span class="token operator">/</span>li<span class="token operator">></span>
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<span class="token operator"><</span><span class="token operator">/</span>ul<span class="token operator">></span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span><span class="token punctuation">;</span>
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<span class="token keyword">const</span> ReactiveProductComponent <span class="token operator">=</span> <span class="token function">observe</span><span class="token punctuation">(</span>ProductComponent<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">const</span> Product <span class="token operator">=</span> subspace<span class="token punctuation">.</span><span class="token function">contract</span><span class="token punctuation">(</span><span class="token punctuation">{</span>abi<span class="token punctuation">,</span> address<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">const</span> rating$ <span class="token operator">=</span> Product<span class="token punctuation">.</span>events<span class="token punctuation">.</span>Rating<span class="token punctuation">.</span><span class="token function">track</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token string">"rating"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">pipe</span><span class="token punctuation">(</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token parameter">x</span> <span class="token operator">=></span> <span class="token function">parseInt</span><span class="token punctuation">(</span>x<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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ReactDOM<span class="token punctuation">.</span><span class="token function">render</span><span class="token punctuation">(</span>
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<span class="token operator"><</span>ReactiveProductComponent
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maxRating<span class="token operator">=</span><span class="token punctuation">{</span>rating$<span class="token punctuation">.</span><span class="token function">pipe</span><span class="token punctuation">(</span><span class="token function">$max</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">}</span>
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minRating<span class="token operator">=</span><span class="token punctuation">{</span>rating$<span class="token punctuation">.</span><span class="token function">pipe</span><span class="token punctuation">(</span><span class="token function">$min</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">}</span>
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averageRating<span class="token operator">=</span><span class="token punctuation">{</span>rating$<span class="token punctuation">.</span><span class="token function">pipe</span><span class="token punctuation">(</span><span class="token function">$average</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">}</span>
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<span class="token operator">/</span><span class="token operator">></span><span class="token punctuation">,</span>
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document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'hello-example'</span><span class="token punctuation">)</span>
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<span class="token punctuation">)</span><span class="token punctuation">;</span>
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