我正试图从浏览器上安装的MetaMask中获取地址。我们过去在JS中这样做如下：
const T1 = async () => {
let Address = await window.ethereum.request({
method: "eth_requestAccounts",
});
accountChangeHandler(Address.toString());
// console.log(Address.toString());
};
或
let balance = await window.ethereum.request({
method: "eth_getBalance",
params: [address, "latest"],
});
在PyScript中，我知道我们可以导入js模块并使用window.ethereum，但我不知道如何用方法发送请求。我知道pyfetch。
我看不出如何像在JS中那样导入地址或发送事务。
我写了这个PyScript代码：
from js import document, alert, window, console
from pyodide import create_proxy
from pyodide.http import pyfetch
import asyncio
document.getElementById("status").innerHTML = "Click the button to check Metamask"
async def Check_if_Metamask(param):
if not window.ethereum:
alert("install metamask")
else:
document.getElementById("status").innerHTML = "Metamask is already installed"
document.getElementById("msg").innerHTML = "Welcome!"
# console.log(window.ethereum.request)
a = await window.ethereum.request(
{
method: "eth_requestAccounts",
}
)
Address = await pyfetch(a, method="Get")
output = Address
console.log(output)
console.log("This is a")
console.log(a)
def setup():
# Create a JsProxy for the callback function
click_proxy = create_proxy(Check_if_Metamask)
# Set the listener to the callback
e = document.getElementById("submit-button2")
e.addEventListener("click", click_proxy)
setup()
相关联的HTML如下
<html>
<head>
<title>Button Event Proxy</title>
<!-- <link rel="stylesheet" href="../Illustration 2/pyscript.css" /> -->
<link rel="stylesheet" href="./buttoncss.css" />
<script defer src="../Illustration 2/pyscript.js"></script>
</head>
<body>
<div id="status">Check Metamask!</div>
<br />
<div id="msg"></div>
<br />
<button class="button-17" id="submit-button2">check</button>
<py-script src="./code.py"> </py-script>
</body>
</html>
当从pyscript在DOM上调用javascript函数时，我们必须创建一个代理并将其设置为回调。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<link rel="stylesheet" href="https://pyscript.net/alpha/pyscript.css" />
<script defer src="https://pyscript.net/alpha/pyscript.js"></script>
</head>
<body>
<button id="connect" style="color:blue" >Connect</button>
<py-script>
from js import alert, window,console,document
# since sending request to metamask async we need this
import asyncio
from pyodide import create_proxy
if not window.ethereum:
alert("install metamask")
if window.ethereum:
button = document.querySelector("button")
# you need to pass "event" arg even though you do not use it. Otherwise it will throw this error
# TypeError: request_eth() takes 0 positional arguments but 1 was given
async def request_eth(event):
try:
await window.ethereum.request(method="eth_requestAccounts")
except Exception as e:
console.log(e)
function=create_proxy(request_eth)
button.addEventListener("click", function,False)
</py-script>
</body>
</html>