[英]Updating React-Select menu with setState?
我試圖讓 React-Select 根據用戶輸入顯示不同的下拉菜單列表:
const helpOptions = [
{ value: "user", label: "u:<String> User Operator" },
{ value: "day", label: "d:<Number> Date Operator" },
{ value: "week", label: "w:<Number> Week Operator" },
{ value: "month", label: "m:<Number> Month Operator" },
{ value: "bracket", label: "() Brackets Operator" },
{ value: "and", label: "&& AND Operator" },
{ value: "or", label: "|| OR Operator" },
{ value: "not", label: "~ NOT Operator" }
];
const userOptions = [
{ value: "john", label: "u:John" },
];
class Field extends Component {
state = {
menu: userOptions,
value: ""
};
onInputChange = e => {
if (e.substring(0, 1) === "?") {
this.setState(
{
menu: helpOptions,
value: e
},
() => {
console.log(this.state.menu);
}
);
} else {
this.setState({
menu: []
});
}
};
render() {
const { menu, value } = this.state;
console.log("rendering");
console.log(menu);
return (
<Select
isMulti
value={value}
options={menu}
onInputChange={this.onInputChange}
/>
);
}
}
期望的行為是如果輸入到搜索字段中的文本的第一個字符是“?” 菜單將填充helpOptions
的常量。 否則它將(暫時)為空。
代碼沙盒: https://codesandbox.io/s/runtime-sun-cfg71
從控制台日志中,我似乎得到了值並且渲染似乎正在工作。 但是,我仍然收到“無選項”作為 React-Select 組件的響應。
如何根據用戶的輸入動態更改 React-Select 菜單項?
更新
如果您希望state
在調用setState
后更新,您需要使用 function,它僅在更新 state 后才有效:
this.setState(state => ({
...state,
menu: helpOptions
}));
首先,您需要在組件中調用構造函數。 其次,在react-select
屬性value
的文檔中不存在。 第三,最好在更改之前復制您的 state。
這是一個有效的代碼:
import React, { Component } from "react";
import Select from "react-select";
import "./styles.css";
const helpOptions = [
{ value: "user", label: "u:<String> User Operator" },
{ value: "day", label: "d:<Number> Date Operator" },
{ value: "week", label: "w:<Number> Week Operator" },
{ value: "month", label: "m:<Number> Month Operator" },
{ value: "bracket", label: "() Brackets Operator" },
{ value: "and", label: "&& AND Operator" },
{ value: "or", label: "|| OR Operator" },
{ value: "not", label: "~ NOT Operator" }
];
const userOptions = [
{ value: "john", label: "u:John" },
{ value: "stan", label: "d:Stan" },
{ value: "addison", label: "w:Addison" },
{ value: "dionis", label: "m:Dionis" }
];
class Field extends Component {
constructor(props) {
super(props);
this.state = {
menu: userOptions,
value: ""
};
}
onInputChange = e => {
if (e.substring(0, 1) === "?") {
console.log("help");
this.setState({
...this.state,
menu: helpOptions
});
} else {
this.setState({
...this.state,
menu: userOptions
});
}
};
render() {
const { menu, value } = this.state;
return <Select isMulti options={menu} onInputChange={this.onInputChange} />;
}
}
export default Field;
這是關於代碼沙盒的示例。
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