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metamask-extension/mascara/example/app.js

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const EthQuery = require('ethjs-query')
window.addEventListener('load', loadProvider)
window.addEventListener('message', console.warn)
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async function loadProvider() {
const ethereumProvider = window.metamask.createDefaultProvider({ host: 'http://localhost:9001' })
const ethQuery = new EthQuery(ethereumProvider)
const accounts = await ethQuery.accounts()
window.METAMASK_ACCOUNT = accounts[0] || 'locked'
logToDom(accounts.length ? accounts[0] : 'LOCKED or undefined', 'account')
setupButtons(ethQuery)
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}
function logToDom(message, context){
document.getElementById(context).innerText = message
console.log(message)
}
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function setupButtons (ethQuery) {
const accountButton = document.getElementById('action-button-1')
accountButton.addEventListener('click', async () => {
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const accounts = await ethQuery.accounts()
window.METAMASK_ACCOUNT = accounts[0] || 'locked'
logToDom(accounts.length ? accounts[0] : 'LOCKED or undefined', 'account')
})
const txButton = document.getElementById('action-button-2')
txButton.addEventListener('click', async () => {
if (!window.METAMASK_ACCOUNT || window.METAMASK_ACCOUNT === 'locked') return
const txHash = await ethQuery.sendTransaction({
from: window.METAMASK_ACCOUNT,
to: window.METAMASK_ACCOUNT,
data: '',
})
logToDom(txHash, 'cb-value')
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})
}