我尝试使用 React Hook Form 进行文件输入验证,是的。我写了下面的代码,但是当我测试文件的大小时,它在这里显示console.log(value[0].size);
即使我在文件输入中选择了一个文件,该值也是未定义的。这有什么问题吗?
我在用FormProvider
and useFormContext
.
在我的 Parent.js 中,我有以下代码:
const Parent = () => {
const addingProcess = () => {
//..
};
const validationSchema = Yup.object().shape({
photo: Yup.mixed()
.required("You need to provide a file")
.test("fileSize", "File Size is too large", (value) => {
console.log(value[0].size);
return value[0].size <= 5242880;
})
.test("fileType", "Unsupported File Format", (value) =>
["image/jpeg", "image/png", "image/jpg"].includes(value.type)
),
});
const methods = useForm({
mode: "onSubmit",
resolver: yupResolver(validationSchema),
});
const { handleSubmit } = methods;
return (
<Wrapper>
<FormProvider {...methods}>
<Form onSubmit={handleSubmit(addingProcess)}>
<Photos />
</Form>
</FormProvider>
</Wrapper>
);
};
在我的 Photos.js 中我有:
const Photos = () => {
return (
<Wrapper>
<PhotoHolder/>
</Wrapper>
);
};
export default Photos;
在我的 PhotoHolder.js 文件中,我有这个(是的,我需要像这样的 onChange):
const PhotoHolder = () => {
const { register } = useFormContext();
const validator = register("photo");
return (
<Input
name="photo"
type="file"
multiple
onChange={(e) => {
validator.onChange(e);
}}
/>
);
};