MyCrypto/common/containers/Tabs/SendTransaction/components/AmountField.tsx

import React from 'react';
import translate, { translateRaw } from 'translations';
import UnitDropdown from './UnitDropdown';
import { Ether } from 'libs/units';

interface Props {
  value: string;
  unit: string;
  tokens: string[];
  balance: number | null | Ether;
  onChange?(value: string, unit: string): void;
}

export default class AmountField extends React.Component {
  public props: Props;

  public render() {
    const { value, unit, onChange, balance } = this.props;
    const isReadonly = !onChange;
    return (
      <div className="row form-group">
        <div className="col-xs-11">
          <label>{translate('SEND_amount')}</label>
          <div className="input-group">
            <input
              className={`form-control ${isFinite(Number(value)) &&
              Number(value) > 0
                ? 'is-valid'
                : 'is-invalid'}`}
              type="text"
              placeholder={translateRaw('SEND_amount_short')}
              value={value}
              disabled={isReadonly}
              onChange={isReadonly ? void 0 : this.onValueChange}
            />
            <UnitDropdown
              value={unit}
              options={['ether'].concat(this.props.tokens)}
              onChange={isReadonly ? void 0 : this.onUnitChange}
            />
          </div>
          {!isReadonly &&
            balance && (
              <span className="help-block">
                <a onClick={this.onSendEverything}>
                  <span className="strong">
                    {translate('SEND_TransferTotal')}
                  </span>
                </a>
              </span>
            )}
        </div>
      </div>
    );
  }

  public onUnitChange = (unit: string) => {
    if (this.props.onChange) {
      this.props.onChange(this.props.value, unit);
    }
  };

  public onValueChange = (e: React.SyntheticEvent<HTMLInputElement>) => {
    if (this.props.onChange) {
      this.props.onChange(
        (e.target as HTMLInputElement).value,
        this.props.unit
      );
    }
  };

  public onSendEverything = () => {
    if (this.props.onChange) {
      this.props.onChange('everything', this.props.unit);
    }
  };
}