84 lines
1.8 KiB
Markdown
84 lines
1.8 KiB
Markdown
# @parity/parity.js
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Parity.js is a thin, fast, Promise-based wrapper around the Ethereum APIs.
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[https://github.com/paritytech/parity/tree/master/js/src/api](https://github.com/paritytech/parity/tree/master/js/src/api)
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## installation
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Install the package with `npm install --save @parity/parity.js`
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## usage
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### initialisation
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```javascript
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// import the actual Api class
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import { Api } from '@parity/parity.js';
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// do the setup
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const provider = new Api.Provider.Http('http://localhost:8545');
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const api = new Api(provider);
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```
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### making calls
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perform a call
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```javascript
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api.eth
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.coinbase()
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.then((coinbase) => {
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console.log(`The coinbase is ${coinbase}`);
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});
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```
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multiple promises
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```javascript
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Promise
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.all([
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api.eth.coinbase(),
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api.net.listening()
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])
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.then(([coinbase, listening]) => {
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// do stuff here
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});
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```
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chaining promises
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```javascript
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api.eth
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.newFilter({...})
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.then((filterId) => api.eth.getFilterChanges(filterId))
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.then((changes) => {
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console.log(changes);
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});
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```
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### contracts
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attach contract
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```javascript
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const abi = [{ name: 'callMe', inputs: [{ type: 'bool', ...}, { type: 'string', ...}]}, ...abi...];
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const address = '0x123456...9abc';
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const contract = new api.newContract(abi, address);
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```
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find & call a function
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```javascript
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contract.instance
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.callMe
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.call({ gas: 21000 }, [true, 'someString']) // or estimateGas or postTransaction
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.then((result) => {
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console.log(`the result was ${result}`);
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});
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```
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## apis
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APIs implement the calls as exposed in the [Ethcore JSON Ethereum RPC](https://github.com/paritytech/ethereum-rpc-json/) definitions. Mapping follows the naming conventions of the originals, i.e. `eth_call` becomes `eth.call`, `personal_accounts` becomes `personal.accounts`, etc.
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