[英]TypeError: undefined is not an object (evaluating style.width) react native
[英]React Native TypeError: undefined is not an object ('evaluating useFormikContext.errors')
我正在开发一个带有本机反应的应用程序。 对表单使用 formik,我收到此错误 'TypeError: undefined is not an object (evalating '_useFormikContext.errors') '
import { useFormikContext } from "formik";
import { ErrorMessage } from "./index";
import ImageInputList from "../ImageInputList";
function FormImagePicker({ name }) {
const { errors, setFieldValue, touched, values } = useFormikContext();
const imageUris = values[name];
const handleAdd = (uri) => {
setFieldValue(name, [...imageUris, uri]);
};
const handleRemove = (uri) => {
setFieldValue(
name,
imageUris.filter((imageUri) => imageUri !== uri)
);
};
return (
<>
<ImageInputList
imageUris={imageUris}
onAddImage={handleAdd}
onRemoveImage={handleRemove}
/>
<ErrorMessage error={errors[name]} visible={touched[name]} />
</>
);
}
export default FormImagePicker;
您正在尝试获取尚未定义的对象属性,请尝试执行以下操作:
{errors && (<ErrorMessage error={errors[name]} visible={touched[name]} />)}
如果这不是您想要的,请尝试找到不同的解决方案,但请始终记住,您不能像那样得到errors[name]
,您必须确保在这样做之前存在errors
。
希望这能解决您的问题,干杯!
您应该在 formik 组件中调用FormImagePicker
:
<AppForm
initialValues={{
title: "",
price: "",
description: "",
category: null,
images: [],
}}
validationSchema={validationSchema}
onSubmit={(values) => console.log(values)}
>
<FormImagePicker name="images" /> // ==> here <==
<AppFormField maxLength={255} name="title" placeholder="Title" />
<AppFormField
keyboardType="numeric"
maxLength={8}
name="price"
placeholder="Pirce"
width={120}
/>
<AppFormPicker
item={categories}
name="category"
placeholder="Category"
width={"50%"}
PickerItemComponent={CategoryPickerItem}
numberOfColumns={3}
/>
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