I am following the serverless-stack.com tutorial. But I am stuck after creating the login button.
I keep getting the error:
Uncaught Error: Too many re-renders. React limits the number of renders to prevent an infinite loop.
I don't know what is causing the render so many times. I combined my LoaderButton instead of importing to make it simpler.
import React, { useState } from "react";
import { Auth } from "aws-amplify";
import { useHistory } from "react-router-dom";
import { FormGroup, FormControl, ControlLabel } from "react-bootstrap";
import { useFormFields } from "../libs/hooksLib";
import { onError } from "../libs/errorLib";
import "../css/index.css";
const LoaderButton = (
isLoading,
className = "",
disabled = false,
...props ) => {
return(
<Button
className={`LoaderButton ${className}`}
disabled={disabled || isLoading}
{...props}
>
{isLoading && <Glyphicon glyph="refresh" className="spinning" />}
{props.children}
</Button>
)
};
export default function Login() {
let history = useHistory();
const [isLoading, setIsLoading] = useState(false);
const [fields, handleFieldChange] = useFormFields({
email: "",
password: ""
});
function validateForm() {
return fields.email.length > 0 && fields.password.length > 0;
}
async function handleSubmit(event) {
event.preventDefault();
setIsLoading(true);
try {
await Auth.signIn(fields.email, fields.password);
userHasAuthenticated(true);
console.log(history);
//history.push("/");
} catch (e) {
onError(e);
setIsLoading(false);
}
}
return (
<div className="Login">
<form onSubmit={ () => { handleSubmit() } }>
<FormGroup controlId="email" bsSize="large">
<ControlLabel>Email</ControlLabel>
<FormControl
autoFocus
type="email"
value={fields.email}
onChange={ () => { handleFieldChange() } }
/>
</FormGroup>
<FormGroup controlId="password" bsSize="large">
<ControlLabel>Password</ControlLabel>
<FormControl
type="password"
value={fields.password}
onChange={ () => { handleFieldChange() } }
/>
</FormGroup>
<LoaderButton
block
type="submit"
bsSize="large"
isLoading={ () => { isLoading() } }
disabled={() => { !validateForm() }}
>
Login
</LoaderButton>
</form>
</div>
);
}
hooksLib.js / useFormFields
import { useState } from 'react'
const useFormFields = (initalState) => {
const [fields, setValues] = useState(initalState)
return [
fields,
setValues({
...fields,
[event.target.id]: event.target.value
})
]
}
export { useFormFields }
Your custom hook should look like this if you want to accept the event
value:
const useFormFields = (initalState) => {
const [fields, setValues] = useState(initalState)
return [
fields,
(event) => setValues({
...fields,
[event.target.id]: event.target.value
})
]
}
Since that parameter is actually a callback that should occur.
Also, your LoadingButton
implementation needs to change to this:
<LoaderButton
block
type="submit"
bsSize="large"
isLoading={isLoading} // This is a boolean value, not a function
disabled={() => !validateForm()}
>...</LoaderButton>
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