laalaguer

// Using thor-devkit.js
const Transaction = require('thor-devkit/dist/transaction').Transaction

// Construct transaction body.
const txBody = {
    // Test-net: 0x27,  Main-net: 0x4a.
    chainTag: 0x27,
    // After which block this tx should happen?
    // 16 characters of block ID.
    blockRef: '0x004984e1064ed410',

laalaguer

pragma solidity ^0.5.11;

contract Hello {
    uint public counter;

    constructor () public {
        counter = 0;
    }

    function increaseAmount () public {

laalaguer

/**
 * Get token amount of holder from a contract.
 * @param {String} addressContract 0x started address.
 * @param {String} addressHolder 0x started address.
 */
async function getTokenBalance (addressContract, addressHolder) {
    const balanceOfABI = {
        'constant': true,
        'inputs': [
        {

laalaguer

<template>
  <div id="app">
    <div>
      <b-card style="max-width: 30rem;" :header="myaddress">
        <p>{{myamount}} <span class="text-primary">VTHO</span></p>

        <b-form-group label="To Address:" label-for="toaddress">
          <b-form-input id="toaddress" v-model.trim="toaddress"></b-form-input>
        </b-form-group>

laalaguer

<template>
  <div id="app">
    <div>
      <b-card style="max-width: 30rem;" :header="myaddress">
        <p>{{myamount}} <span class="text-primary">VTHO</span></p>

        <b-form-group label="To Address:" label-for="toaddress">
          <b-form-input id="toaddress" v-model.trim="toaddress"></b-form-input>
        </b-form-group>

laalaguer

<script>
methods: {
 // ... add after refreshTokenBalance()
  transfer () { // Confrim and send out a transfer.
    const evmAmount = utils.humanToEVM(this.toamount.toString(), 18)
    operations.transferToken(this.contract, this.myaddress, this.toaddress, evmAmount, this.toamount, 'VTHO')
      .then(result => {alert('success!')})
      .catch(e => {alert('failed!')})
  }
}

laalaguer

<!-- Continue with the App.vue -->
<script>
const operations = require('./operations.js')
const utils = require('./utils.js')

export default {
  data() {
    return {
      myaddress: '0xa7a609b928c4eac077d0e5640f3fa650746c4fcf',
      myamount: 0,

laalaguer

const BigNumber = require('bignumber.js')
const DECIMALS = function (points) {
  return new BigNumber(10 ** points) // Decimals = 18 on VTHO and most contracts.
}

/**
 * Turn a string to big number.
 * @param {String} aString a number string.
 */
const makeBN = function (aString) {

laalaguer

  export {
    getTokenBalance,
    transferToken
  }

laalaguer

/**
 * Transfer token from one to another.
 * @param {String} addressContract Contract address.
 * @param {String} signerAddress Enforce who signs the transaction.
 * @param {String} toAddress Receiver of transfer.
 * @param {String} amountEVM Big number in string.
 * @param {Number} amountHuman Normal number in Javascript.
 * @param {String} symbol Symbol of token.
 */
async function transferToken (addressContract, signerAddress, toAddress, amountEVM, amountHuman, symbol) {