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api/docs/api-derive/modules/_chain_subscribenewhead_.html
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2019-02-28 13:02:48 +00:00

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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><section class="sidebar-group depth-0"><a href="/api/examples/promise/" class="sidebar-heading clickable open"><span>Examples (Promise API)</span> <!----></a> <ul class="sidebar-links sidebar-group-items"><li><a href="/api/examples/promise/01_simple_connect/" class="sidebar-link">Simple connect</a></li><li><a href="/api/examples/promise/02_listen_to_blocks/" class="sidebar-link">Listen to blocks</a></li><li><a href="/api/examples/promise/03_listen_to_balance_change/" class="sidebar-link">Listen to balance change</a></li><li><a href="/api/examples/promise/04_unsubscribe/" class="sidebar-link">Unsubscribe from listening</a></li><li><a href="/api/examples/promise/05_read_storage/" class="sidebar-link">Read chain state</a></li><li><a href="/api/examples/promise/06_make_transfer/" class="sidebar-link">Make a transfer</a></li><li><a href="/api/examples/promise/08_system_events/" class="sidebar-link">Display system events</a></li><li><a href="/api/examples/promise/09_transfer_events/" class="sidebar-link">Transaction with events</a></li><li><a href="/api/examples/promise/10_upgrade_chain/" class="sidebar-link">Upgrade via sudo</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>Substrate interfaces</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/api/METHODS_RPC.html" class="sidebar-link">Substrate RPC</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/api/METHODS_RPC.html#json-rpc" class="sidebar-link">JSON-RPC</a></li></ul></li><li><a href="/api/METHODS_STORAGE.html" class="sidebar-link">State storage (defaults)</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/api/METHODS_STORAGE.html#storage" class="sidebar-link">Storage</a></li></ul></li><li><a href="/api/METHODS_EXTRINSICS.html" class="sidebar-link">Extrinsics (defaults)</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/api/METHODS_EXTRINSICS.html#extrinsics" class="sidebar-link">Extrinsics</a></li></ul></li><li><a href="/api/METHODS_EVENTS.html" class="sidebar-link">System events (defaults)</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/api/METHODS_EVENTS.html#events" class="sidebar-link">Events</a></li></ul></li></ul></section></li><li><a href="/api/api/" class="sidebar-link">@polkadot/api</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/api/api/#api-selection" class="sidebar-link">API Selection</a></li><li class="sidebar-sub-header"><a href="/api/api/#dynamic-by-default" class="sidebar-link">Dynamic by default</a></li><li class="sidebar-sub-header"><a href="/api/api/#installation-import" class="sidebar-link">Installation &amp; import</a></li><li class="sidebar-sub-header"><a href="/api/api/#registering-custom-types" class="sidebar-link">Registering custom types</a></li><li class="sidebar-sub-header"><a href="/api/api/#users" class="sidebar-link">Users</a></li><li class="sidebar-sub-header"><a href="/api/api/#classes" class="sidebar-link">Classes</a></li></ul></li><li><a href="/api/types/" class="sidebar-link">@polkadot/types</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/api/types/#primitive-types" class="sidebar-link">Primitive types</a></li><li class="sidebar-sub-header"><a href="/api/types/#substrate-types" class="sidebar-link">Substrate types</a></li><li class="sidebar-sub-header"><a href="/api/types/#codec-types" class="sidebar-link">Codec types</a></li><li class="sidebar-sub-header"><a href="/api/types/#rpc-types" class="sidebar-link">RPC types</a></li><li class="sidebar-sub-header"><a href="/api/types/#derived-types" class="sidebar-link">Derived types</a></li></ul></li><li><a href="/api/CONTRIBUTING.html" class="sidebar-link">Contributing</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/api/CONTRIBUTING.html#what" class="sidebar-link">What?</a></li><li class="sidebar-sub-header"><a href="/api/CONTRIBUTING.html#rules" class="sidebar-link">Rules</a></li><li class="sidebar-sub-header"><a href="/api/CONTRIBUTING.html#releases" class="sidebar-link">Releases</a></li><li class="sidebar-sub-header"><a href="/api/CONTRIBUTING.html#changes-to-this-arrangement" class="sidebar-link">Changes to this arrangement</a></li><li class="sidebar-sub-header"><a href="/api/CONTRIBUTING.html#heritage" class="sidebar-link">Heritage</a></li></ul></li></ul> </aside> <main class="page"> <div class="content default"><h1 id="type-aliases"><a href="#type-aliases" aria-hidden="true" class="header-anchor">#</a> Type aliases</h1> <p><a id="headerandvalidators"></a></p> <h2 id="headerandvalidators"><a href="#headerandvalidators" aria-hidden="true" class="header-anchor">#</a> HeaderAndValidators</h2> <p><strong>Ƭ HeaderAndValidators</strong>: <em>[<code>Header</code>, <code>Array</code>&lt;<code>AccountId</code>&gt;]</em></p> <p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/1ea1f6f/packages/api-derive/src/chain/subscribeNewHead.ts#L12" target="_blank" rel="noopener noreferrer">chain/subscribeNewHead.ts:12<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></em></p> <hr> <h1 id="functions"><a href="#functions" aria-hidden="true" class="header-anchor">#</a> Functions</h1> <p><a id="subscribenewhead"></a></p> <h2 id="subscribenewhead"><a href="#subscribenewhead" aria-hidden="true" class="header-anchor">#</a> subscribeNewHead</h2> <p>▸ <strong>subscribeNewHead</strong>(api: <em><code>ApiInterface$Rx</code></em>): <code>(Anonymous function)</code></p> <p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/1ea1f6f/packages/api-derive/src/chain/subscribeNewHead.ts#L25" target="_blank" rel="noopener noreferrer">chain/subscribeNewHead.ts:25<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg></a></em></p> <p><em><strong>description</strong></em>: Subscribe to block headers and extend it with the author</p> <p><em><strong>example</strong></em>:</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code>api<span class="token punctuation">.</span>derive<span class="token punctuation">.</span>chain<span class="token punctuation">.</span><span class="token function">subscribeNewHead</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">{</span> author<span class="token punctuation">,</span> blockNumber <span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token template-string"><span class="token string">`block #</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>blockNumber<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"> was authored by </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>author<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p><strong>Parameters:</strong></p> <table><thead><tr><th>Name</th> <th>Type</th></tr></thead> <tbody><tr><td>api</td> <td><code>ApiInterface$Rx</code></td></tr></tbody></table> <p><strong>Returns:</strong> <code>(Anonymous function)</code></p> <hr></div> <footer class="page-edit"><!----> <!----></footer> <!----> </main></div><div class="global-ui"></div></div>
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