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Simple connect
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href="../.." >WsProvider</a>
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<section class="normal markdown-section">
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<p>The WebSocket Provider allows sending requests using WebSocket. Unlike the <a href="_http_index_.httpprovider.html">HttpProvider</a>, it does support subscriptions and allows listening to events such as new blocks or balance changes.</p>
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<pre><code class="lang-javascript"><span class="hljs-keyword">import</span> createApi <span class="hljs-keyword">from</span> <span class="hljs-string">'@polkadot/api'</span>;
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<span class="hljs-keyword">import</span> WsProvider <span class="hljs-keyword">from</span> <span class="hljs-string">'@polkadot/api-provider/ws'</span>;
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<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>);
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<span class="hljs-keyword">const</span> api = createApi(provider);
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</code></pre>
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<p>.
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<em><strong>example</strong></em>: ```javascript
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import createApi from '@polkadot/api';
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import WsProvider from '@polkadot/api-provider/ws';
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const provider = new WsProvider('ws://127.0.0.1:9944');
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const api = createApi(provider);</p>
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<pre><code>
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*__see__*: [HttpProvider](_http_index_.httpprovider.md)
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# Type parameters
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#### EventTypes : `string` &#124; `symbol`
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# Hierarchy
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`EventEmitter`
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**↳ WsProvider**
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# Implements
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* `WSProviderInterface`
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# Constructors
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<a id="constructor"></a>
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## constructor
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⊕ **new WsProvider**(endpoint: *`string`*, autoConnect?: *`boolean`*): [WsProvider](_ws_index_.wsprovider.md)
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*Defined in [ws/index.ts:69](https://github.com/polkadot-js/api/blob/dfd2e70/packages/api-provider/src/ws/index.ts#L69)*
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**Parameters:**
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| Param | Type | Default value | Description |
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| ------ | ------ | ------ | ------ |
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| endpoint | `string` | - | The endpoint url. Usually \`ws://ip:9944\` or \`wss://ip:9944\` |
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| `Default value` autoConnect | `boolean` | true | Whether to connect automatically or not. |
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**Returns:** [WsProvider](_ws_index_.wsprovider.md)
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___
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# Properties
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<a id="prefixed"></a>
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## `<Static>` prefixed
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**● prefixed**: * `string` &#124; `boolean`
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*
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*Inherited from EventEmitter.prefixed*
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*Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:6*
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___
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# Methods
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<a id="addlistener"></a>
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## addListener
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▸ **addListener**(event: *`EventTypes`*, fn: *`ListenerFn`*, context?: *`any`*): `this`
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*Inherited from EventEmitter.addListener*
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*Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:33*
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**Parameters:**
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| Param | Type |
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| ------ | ------ |
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| event | `EventTypes` |
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| fn | `ListenerFn` |
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| `Optional` context | `any` |
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**Returns:** `this`
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___
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<a id="connect"></a>
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## connect
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▸ **connect**(): `void`
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*Defined in [ws/index.ts:99](https://github.com/polkadot-js/api/blob/dfd2e70/packages/api-provider/src/ws/index.ts#L99)*
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The [WsProvider](_ws_index_.wsprovider.md) connects automatically by default. if you decided otherwise, you may connect manually using this method.
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**Returns:** `void`
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___
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<a id="emit"></a>
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## emit
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▸ **emit**(event: *`EventTypes`*, ...args: *`Array`<`any`>*): `boolean`
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*Inherited from EventEmitter.emit*
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*Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:27*
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Calls each of the listeners registered for a given event.
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**Parameters:**
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| Param | Type |
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| ------ | ------ |
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| event | `EventTypes` |
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| `Rest` args | `Array`<`any`> |
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**Returns:** `boolean`
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___
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<a id="eventnames"></a>
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## eventNames
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▸ **eventNames**(): `Array`<`EventTypes`>
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*Inherited from EventEmitter.eventNames*
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*Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:12*
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Return an array listing the events for which the emitter has registered listeners.
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**Returns:** `Array`<`EventTypes`>
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___
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<a id="isconnected"></a>
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## isConnected
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▸ **isConnected**(): `boolean`
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*Defined in [ws/index.ts:116](https://github.com/polkadot-js/api/blob/dfd2e70/packages/api-provider/src/ws/index.ts#L116)*
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Whether the node is connected or not.
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**Returns:** `boolean`
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true if connected
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___
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<a id="listenercount"></a>
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## listenerCount
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▸ **listenerCount**(event: *`EventTypes`*): `number`
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*Inherited from EventEmitter.listenerCount*
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*Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:22*
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Return the number of listeners listening to a given event.
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**Parameters:**
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| Param | Type |
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| ------ | ------ |
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| event | `EventTypes` |
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**Returns:** `number`
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___
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<a id="listeners"></a>
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## listeners
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▸ **listeners**(event: *`EventTypes`*): `Array`<`ListenerFn`>
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*Inherited from EventEmitter.listeners*
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*Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:17*
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Return the listeners registered for a given event.
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**Parameters:**
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| Param | Type |
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| ------ | ------ |
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| event | `EventTypes` |
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**Returns:** `Array`<`ListenerFn`>
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___
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<a id="off"></a>
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## off
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▸ **off**(event: *`EventTypes`*, fn?: *[ListenerFn](../interfaces/_ws_index_.wsprovider.eventemitter.listenerfn.md)*, context?: *`any`*, once?: * `undefined` &#124; `false` &#124; `true`*): `this`
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*Inherited from EventEmitter.off*
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*Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:44*
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**Parameters:**
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| Param | Type |
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| ------ | ------ |
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| event | `EventTypes` |
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| `Optional` fn | [ListenerFn](../interfaces/_ws_index_.wsprovider.eventemitter.listenerfn.md) |
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| `Optional` context | `any` |
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| `Optional` once | `undefined` &#124; `false` &#124; `true`|
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**Returns:** `this`
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___
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<a id="on"></a>
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## on
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▸ **on**(type: *[ProviderInterface$Emitted](../modules/_types_d_.md#providerinterface_emitted)*, sub: *[ProviderInterface$EmitCb](../modules/_types_d_.md#providerinterface_emitcb)*): `this`
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*Overrides EventEmitter.on*
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*Defined in [ws/index.ts:126](https://github.com/polkadot-js/api/blob/dfd2e70/packages/api-provider/src/ws/index.ts#L126)*
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Listens on events after having subscribed using the [subscribe](_ws_index_.wsprovider.md#subscribe) function.
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**Parameters:**
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| Param | Type | Description |
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| ------ | ------ | ------ |
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| type | [ProviderInterface$Emitted](../modules/_types_d_.md#providerinterface_emitted) | Event |
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| sub | [ProviderInterface$EmitCb](../modules/_types_d_.md#providerinterface_emitcb) | Callback |
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**Returns:** `this`
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[description]
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___
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<a id="once"></a>
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## once
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▸ **once**(event: *`EventTypes`*, fn: *`ListenerFn`*, context?: *`any`*): `this`
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*Inherited from EventEmitter.once*
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*Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:38*
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Add a one-time listener for a given event.
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**Parameters:**
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| Param | Type |
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| ------ | ------ |
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| event | `EventTypes` |
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| fn | `ListenerFn` |
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| `Optional` context | `any` |
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**Returns:** `this`
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___
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<a id="removealllisteners"></a>
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## removeAllListeners
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▸ **removeAllListeners**(event?: *[EventTypes]()*): `this`
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*Inherited from EventEmitter.removeAllListeners*
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*Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:49*
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Remove all listeners, or those of the specified event.
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**Parameters:**
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| Param | Type |
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| ------ | ------ |
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| `Optional` event | [EventTypes]() |
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**Returns:** `this`
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___
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<a id="removelistener"></a>
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## removeListener
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▸ **removeListener**(event: *`EventTypes`*, fn?: *[ListenerFn](../interfaces/_ws_index_.wsprovider.eventemitter.listenerfn.md)*, context?: *`any`*, once?: * `undefined` &#124; `false` &#124; `true`*): `this`
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*Inherited from EventEmitter.removeListener*
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*Defined in /home/travis/build/polkadot-js/api/node_modules/eventemitter3/index.d.ts:43*
|
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Remove the listeners of a given event.
|
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**Parameters:**
|
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|
| Param | Type |
|
|
| ------ | ------ |
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|
| event | `EventTypes` |
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| `Optional` fn | [ListenerFn](../interfaces/_ws_index_.wsprovider.eventemitter.listenerfn.md) |
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| `Optional` context | `any` |
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| `Optional` once | `undefined` &#124; `false` &#124; `true`|
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**Returns:** `this`
|
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___
|
|
<a id="send"></a>
|
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|
|
## send
|
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▸ **send**(method: *`string`*, params: *`Array`<`any`>*, subscription?: *`SubscriptionHandler`*): `Promise`<`any`>
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|
*Defined in [ws/index.ts:130](https://github.com/polkadot-js/api/blob/dfd2e70/packages/api-provider/src/ws/index.ts#L130)*
|
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|
|
**Parameters:**
|
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|
|
| Param | Type |
|
|
| ------ | ------ |
|
|
| method | `string` |
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|
| params | `Array`<`any`> |
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|
| `Optional` subscription | `SubscriptionHandler` |
|
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|
**Returns:** `Promise`<`any`>
|
|
|
|
___
|
|
<a id="subscribe"></a>
|
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|
|
## subscribe
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|
▸ **subscribe**(type: *`string`*, method: *`string`*, params: *`Array`<`any`>*, callback: *[ProviderInterface$Callback](../modules/_types_d_.md#providerinterface_callback)*): `Promise`<`number`>
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*Defined in [ws/index.ts:183](https://github.com/polkadot-js/api/blob/dfd2e70/packages/api-provider/src/ws/index.ts#L183)*
|
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|
Allows subscribing to a specific event.
|
|
*__example__*: ```javascript
|
|
const provider = new WsProvider('ws://127.0.0.1:9944');
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|
const api = createApi(provider);
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api.state.storage([[storage.staking.public.freeBalanceOf, <Address>]], (_, values) => {
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console.log(values)
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|
}).then((subscriptionId) => {
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|
console.log('balance changes subscription id: ', subscriptionId)
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})
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</code></pre><p><strong>Parameters:</strong></p>
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<table>
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<thead>
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|
<tr>
|
|
<th>Param</th>
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<th>Type</th>
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<th>Description</th>
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|
</tr>
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|
</thead>
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|
<tbody>
|
|
<tr>
|
|
<td>type</td>
|
|
<td><code>string</code></td>
|
|
<td>Subscription type</td>
|
|
</tr>
|
|
<tr>
|
|
<td>method</td>
|
|
<td><code>string</code></td>
|
|
<td>Subscription method</td>
|
|
</tr>
|
|
<tr>
|
|
<td>params</td>
|
|
<td><code>Array</code><<code>any</code>></td>
|
|
<td>Parameters</td>
|
|
</tr>
|
|
<tr>
|
|
<td>callback</td>
|
|
<td><a href="../modules/_types_d_.md#providerinterface_callback">ProviderInterface$Callback</a></td>
|
|
<td>Callback</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p><strong>Returns:</strong> <code>Promise</code><<code>number</code>>
|
|
Promise resolving to the dd of the subscription you can use with [[unsubscribe]].</p>
|
|
<hr>
|
|
<p><a id="unsubscribe"></a></p>
|
|
<h2 id="unsubscribe">unsubscribe</h2>
|
|
<p>▸ <strong>unsubscribe</strong>(type: <em><code>string</code></em>, method: <em><code>string</code></em>, id: <em><code>number</code></em>): <code>Promise</code><<code>boolean</code>></p>
|
|
<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/dfd2e70/packages/api-provider/src/ws/index.ts#L192" target="_blank">ws/index.ts:192</a></em></p>
|
|
<p>Allows unsubscribing to subscriptions made with <a href="_ws_index_.wsprovider.html#subscribe">subscribe</a>.</p>
|
|
<p><strong>Parameters:</strong></p>
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Param</th>
|
|
<th>Type</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
<tr>
|
|
<td>type</td>
|
|
<td><code>string</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td>method</td>
|
|
<td><code>string</code></td>
|
|
</tr>
|
|
<tr>
|
|
<td>id</td>
|
|
<td><code>number</code></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p><strong>Returns:</strong> <code>Promise</code><<code>boolean</code>></p>
|
|
<hr>
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