101 lines
2.8 KiB
JavaScript
101 lines
2.8 KiB
JavaScript
import EmbarkJS from 'Embark/EmbarkJS';
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import SimpleStorage from 'Embark/contracts/SimpleStorage';
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import React from 'react';
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import { Form, FormGroup, FormControl, HelpBlock, Button } from 'react-bootstrap';
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class Blockchain extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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valueSet: 10,
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valueGet: "",
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logs: []
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}
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}
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handleChange(e) {
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this.setState({ valueSet: e.target.value });
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}
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checkEnter(e, func) {
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if (e.key !== 'Enter') {
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return;
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}
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e.preventDefault();
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func.apply(this, [e]);
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}
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setValue(e) {
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e.preventDefault();
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var value = parseInt(this.state.valueSet, 10);
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// If web3.js 1.0 is being used
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if (EmbarkJS.isNewWeb3()) {
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SimpleStorage.methods.set(value).send({ from: web3.eth.defaultAccount });
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this._addToLog("SimpleStorage.methods.set(value).send({from: web3.eth.defaultAccount})");
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} else {
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SimpleStorage.set(value);
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this._addToLog("#blockchain", "SimpleStorage.set(" + value + ")");
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}
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}
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getValue(e) {
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e.preventDefault();
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if (EmbarkJS.isNewWeb3()) {
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SimpleStorage.methods.get().call()
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.then(_value => this.setState({ valueGet: _value }))
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this._addToLog("SimpleStorage.methods.get(console.log)");
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} else {
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SimpleStorage.get()
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.then(_value => this.setState({ valueGet: _value }));
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this._addToLog("SimpleStorage.get()");
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}
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}
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_addToLog(txt) {
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this.state.logs.push(txt);
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this.setState({ logs: this.state.logs });
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}
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render() {
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return (<React.Fragment>
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<h3> 1. Set the value in the blockchain</h3>
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<Form inline onKeyDown={(e) => this.checkEnter(e, this.setValue)}>
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<FormGroup>
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<FormControl
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type="text"
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defaultValue={this.state.valueSet}
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onChange={(e) => this.handleChange(e)}/>
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<Button bsStyle="primary" onClick={(e) => this.setValue(e)}>Set Value</Button>
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<HelpBlock>Once you set the value, the transaction will need to be mined and then the value will be updated
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on the blockchain.</HelpBlock>
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</FormGroup>
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</Form>
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<h3> 2. Get the current value</h3>
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<Form inline>
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<FormGroup>
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<HelpBlock>current value is <span className="value">{this.state.valueGet}</span></HelpBlock>
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<Button bsStyle="primary" onClick={(e) => this.getValue(e)}>Get Value</Button>
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<HelpBlock>Click the button to get the current value. The initial value is 100.</HelpBlock>
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</FormGroup>
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</Form>
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<h3> 3. Contract Calls </h3>
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<p>Javascript calls being made: </p>
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<div className="logs">
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{
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this.state.logs.map((item, i) => <p key={i}>{item}</p>)
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}
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</div>
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</React.Fragment>
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);
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}
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}
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export default Blockchain;
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