I have added a form in my app. When I send the form data to my local server I create an image with a title. When I attach images I should be using input type="file"
. Also, I should use FormData in my app.
But when I write my component I have an error 'formElem' is not defined
in the two lines commented in the code. How do I fix it?
Here is my component code:
const AddImage = (props) => {
formElem.onsubmit = async (e) => { // ERROR THERE
e.preventDefault();
try {
const response = await api(`${imageRoute}`, {
method:'POST',
body: new FormData(formElem), // ERROR THERE
});
} catch(e) {
console.error(e);
}
};
return (
<div className="formImage">
<form id="formElem">
<input type="text" name="name" value=""/>
<input type="text" name="surname" value=""/>
<input type="file" name="picture" accept="image/*"/>
<div className="formButtonImage">
<button type="submit">Add</button>
</div>
</form>
</div>
);
};
There is quite a lot of issues in your code but this should fix most of them:
import React, { useRef } from "react";
const AddImage = (props) => {
const formRef = useRef();
const handleSubmit = async (event) => {
event.preventDefault();
const data = new FormData(formRef.current);
// Let's assume that api and imageRoute SOMEHOW exists
try {
const response = await api(imageRoute, {
method: 'POST',
body: data, // ERROR THERE
});
} catch(e) {
console.error(e);
}
};
return (
<div className="formImage">
<form onSubmit={handleSubmit} ref={formRef}>
<input type="text" name="name" />
<input type="text" name="surname" />
<input type="file" name="picture" accept="image/*" />
<div className="formButtonImage">
<button type="submit">Add</button>
</div>
</form>
</div>
);
}
Make sure you remove value=""
from your form elements, otherwise React will treat them as controlled and you will not be able to actually write to them.
const AddImage = (props) => {
const formEl = useRef(null)
const onsubmit = () => {
e.preventDefault();
try {
const response = await api(`${imageRoute}`, {
method:'POST',
body: new FormData(formEl.curent), // ERROR THERE
});
} catch(e) {
console.error(e);
}
}
return (
<div className="formImage">
<form ref={formEl}onSubmit={onSubmit}>
<input type="text" name="name" value=""/>
<input type="text" name="surname" value=""/>
<input type="file" name="picture" accept="image/*"/>
<div className="formButtonImage">
<button type="submit">Add</button>
</div>
</form>
</div>
);
};
But would be better to hang listener on did mount
const AddImage = (props) => {
const formEl = useRef(null)
useEffect(() => {
formEl.current.addEventListener('submit', () => ...)
}, [])
return (
<div className="formImage">
<form ref={formEl}>
<input type="text" name="name" value=""/>
<input type="text" name="surname" value=""/>
<input type="file" name="picture" accept="image/*"/>
<div className="formButtonImage">
<button type="submit">Add</button>
</div>
</form>
</div>
);
};
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