有人可以帮助我使用此代码中的“ref”。在最后一个“视图”组件中，“this.multiSelect”似乎是未定义的。我不明白我为什么会出错以及在哪里出错。它有上下文吗？
import React, { Component } from 'react';
import { View, Text } from 'react-native';
import MultiSelect from 'react-native-multiple-select';
export default class MultiSelectComponent extends Component {
constructor() {
super();
this.state = {
selectedItems : []
};
this.items = [{
id: '92iijs7yta',
name: 'Ondo',
}, {
id: 'suudydjsjd',
name: 'Abuja',
}];
}
onSelectedItemsChange = selectedItems => {
this.setState({ selectedItems });
};
render() {
const { selectedItems } = this.state;
return (
<View style={{ flex: 1 }}>
<MultiSelect
hideTags
items={this.items}
uniqueKey="id"
ref={(component) => { this.multiSelect = component; }}
onSelectedItemsChange = {this.onSelectedItemsChange}
selectedItems={selectedItems}
selectText="Pick Items"
searchInputPlaceholderText="Search Items..."
submitButtonText="Submit"
/>
<View>
{this.multiselect
?
this.multiselect.getSelectedItemsExt(selectedItems)
:
null}
</View>
</View>
);
}
}
您的代码中有错字，错误可能在那里：您正在使用 this.multiselect 并声明
ref={(component) => { this.multiSelect = component; }}
所以也许与这个：
ref={(component) => { this.multiselect = component; }}
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我来说两句