我有一個嵌套的物件陣列，每個物件都有一個這樣的嵌套options陣列。
const [formFields, setFormFields ] = useState({
formTitle: '',
fields: [
{name: 'country', val: '', type: 'radio', options: ['Japan', 'Korea', 'usa'] },
{name: 'state', val: '', type: 'select', options: ['texas', 'florida']},
{name: 'location', val: '', type: 'text', options: []},
]})
嵌套options陣列中的每個專案都應該是可編輯的 textInput 中的一個值。我希望能夠通過單擊按鈕在 textInput 中添加/洗掉/編輯這些值。請問我將如何能夠實作這一目標？
我的代碼
<Containter>
{formFields.fields.map((field, index) => (
<View key={index}>
<View>
<TextInput
onChangeText={(value ) => {
onChange({name: field.name, value });
}}
value={field.name}
/>
</View>
{(field.type === 'select' || field.type === 'radio') && (
<>
{field.options.map((option) => (
<TextInput value={option}
onChangeText={(value ) => {
onChange({name: field.options, ...field.options, value });
}}
/>
<Text onPress={removeOption}>X</Text>
))}
<Button title="add option" />
</>
)
}
<IconButton
icon="delete"
onPress={handleRemoveField}
/>
</View>
))}
<Button
onPress={handleAddField}
title="Add"
/>
</Containter>
uj5u.com熱心網友回復：
// in constructor
this.onChange = this.onChange.bind(this)
// in class
onChange (index,value) {
this.setState(state => {
const fields = state.fields.map((field,i) => {
if (i==index) field.val = value
return field
})
return {
...state,
fields
}
})
}
// in component
onChangeText( (e) => onChange(index, e.target.value) )uj5u.com熱心網友回復：
添加和刪??除實作：
onAdd (index,value) {
const fields = formFields.fields.map((field,i) => {
if (i==index) {
const options = [...field.options,value]
return {...field, options}
}
return field
})
setFormFields(
{
...formFields,
fields
}
)
}
onRemove (index,value) {
const fields = formFields.fields.map((field,i) => {
if (i==index) {
const options = field.options.filter((item) => item != value)
return {...field, options}
}
return field
})
setFormFields(
{
...formFields,
fields
}
)
}轉載請註明出處，本文鏈接：https://www.uj5u.com/yidong/378800.html
標籤：javascript 数组 反应 反应原生
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