在 node.js 中正确使用全局变量还是有更好的方法? [英] Using global variables properly in node.js or is there a better way of doing this?
问题描述
我试图从我的 checkout.html 文件(如下)中获取用户输入的金额，以便我可以在 server.js 上的 Stripe 代码中使用它节点服务器.
我无法从表单中获取 amount 字段，所以我禁用了它并使用 console.log 和变量.我试图让它与传递值的全局变量一起工作.
来自 Stripe 网站示例的这 2 个文件(您从页面中选择node"和html"，然后点击预构建"强>'也)
POST 到服务器端代码，然后使用 带有 Express 的 JSON 正文解析器，以便它在服务器端请求中结束.
I am trying to get a user entered amount from my checkout.html file ( below ) so that I can use it in the Stripe code on the server.js node server.
I wasn't able to get the amount field from the form to work so I disabled it and am working with console.log and variables. I was trying to make it work with a global variable passing the value.
These 2 files from the example on the Stripe website ( you select 'node' and 'html' from the page, and click 'prebuilt' also )
https://stripe.com/docs/checkout/integration-builder
My alterations ( sorry the var assignments numbers are all just random for testing )
**server.js**
( lines 8-9 )
var test = 2242;
// console.log( amountglobal);
( line 22 )
unit_amount: test,
**checkout.html** (line 47 )
amountglobal = 67865555;
My issue is that if I uncomment line 9 ( with the aim of trying to use the amountglobal gloabal var in line 22 ) then for some reason the server wont start, saying amountglobal is not defined ... so I possibly have the global variable wrong in checkout.html, it's
amountglobal = 67865555;
... and maybe there's a better way of doing this in the first place, I understand global variables are not the ideal usually.
The end result here is to be a payment form where the user can type in their own ( previously agreed) price.
Thanks.
FULL FILES
server.js
const stripe = require('stripe')
('sk_test_51IAvl4KYIMptSkmlXwuihwZa8jtdIrnD79kSQcnhvQKbg9dbAXiZisFmasrKHIK9B75d9jgeyYK8MULLbFGrGBpU00uQgDvtnJ');
const express = require('express');
const app = express();
app.use(express.static('.'));
const YOUR_DOMAIN = 'http://localhost:4242';
var test = 2242;
console.log( amountglobal);
app.post('/create-checkout-session', async (req, res) => {
const session = await stripe.checkout.sessions.create({
payment_method_types: ['card'],
line_items: [
{
price_data: {
currency: 'usd',
product_data: {
name: 'Stubborn Attachments',
images: ['https://i.imgur.com/EHyR2nP.png'],
},
unit_amount: test,
},
quantity: 1,
},
],
mode: 'payment',
success_url: `${YOUR_DOMAIN}/success.html`,
cancel_url: `${YOUR_DOMAIN}/cancel.html`,
});
res.json({ id: session.id });
});
app.listen(4242, () => console.log('Running on port 4242'));
Checkout.html
<!DOCTYPE html>
<html>
<head>
<title>Buy cool new product</title>
<link rel="stylesheet" href="style.css">
<script src="https://polyfill.io/v3/polyfill.min.js?version=3.52.1&features=fetch"></script>
<script src="https://js.stripe.com/v3/"></script>
</head>
<body>
<section>
<div class="product">
<img
src="https://i.imgur.com/EHyR2nP.png"
alt="The cover of Stubborn Attachments"
/>
<div class="description">
<h3>Stubborn Attachments</h3>
<h5>$20.00</h5>
</div>
</div>
<form id="frm12" action="#">
First name: <input type="text" name="amount" value = "435"><br>
<!-- <input type="button" onclick="myFunction()" value="Submit"> -->
<input type="submit" id="checkout-button" value="Checkout">
</form>
</section>
</body>
<script type="text/javascript">
function myFunction() {
console.log("test");
document.getElementById("frm1").submit();
}
// Create an instance of the Stripe object with your publishable API key
var stripe = Stripe("pk_test_51IAvl4KYIMptSkmlAwhNvG0CDJRnr2hyrJuRnfdnfaEEhHPwCWsr9QK183a1pKUQ4PLrrtEqiElFLTVHIiSueX6r00TyXooIcu");
var checkoutButton = document.getElementById("checkout-button");
var amount = document.getElementById("amount");
amountglobal = 67865555;
// console.log(amount);
checkoutButton.addEventListener("click", function () {
fetch("/create-checkout-session", {
method: "POST",
})
.then(function (response) {
return response.json();
})
.then(function (session) {
console.log('here');
return stripe.redirectToCheckout({ sessionId: session.id });
})
.then(function (result) {
// If redirectToCheckout fails due to a browser or network
// error, you should display the localized error message to your
// customer using error.message.
if (result.error) {
alert(result.error.message);
}
})
.catch(function (error) {
console.error("Error:", error);
});
});
</script>
</html>
You need to POST the data from your client side code to your server side code, and then use a JSON body parser with Express so that it ends up in the server-side request.
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