[英]How to filter array based on selected item
我在 json 文件中有一个对象数组:
[
{
"department": "Sound Department",
"subDepartments": [
"Supervising Sound Editor",
"Dialog Editor",
"Sound Designer",
"Foley Artis",
"Sound Recordist"
]
},
{
"department": "Camera Department",
"subDepartments": [
"Camera Operator",
"Second Assistant Camera",
"Other Assistant Camera",
"Steadycam Operator",
"Focus Puller"
]
},
{
"department": "Production Department",
"subDepartments": [
"Camera Operator",
"Second Assistant Camera",
"Other Assistant Camera",
"Steadycam Operator",
"Focus Puller"
]
}
]
由此我创建了一个部门下拉菜单。 从那里我想根据选择的部门创建另一个子部门的下拉菜单。
Departments 的下拉菜单工作正常,并且将该部门存储在 state 中。我只是不知道如何过滤这些。
import React, { useState } from "react";
import "./CreateJobPage3.css"
import Button from "../Input/Button";
import Select from "../Input/Select";
import departmentData from "../Data/departmentSheet.json";
const CreateJobPage3 = (props) => {
const [department, setDepartment] = useState()
const [subDepartment, setSubDepartment] = useState()
const departments = departmentData.map((data) => data.department)
const subDepartments = departmentData.filter(item => {
return item.department === department;
});
const departmentHandler = (props) =>{
setDepartment(props)
}
const subDepartmentHandler = (props) =>{
setSubDepartment(props)
}
return (
<>
<div className="CJP3___inner">
<Select
placeholder="Choose Department"
options={departments}
value={department}
onChangeOption={departmentHandler}
/>
<Select
placeholder="Choose Department"
options={subDepartments}
value={subDepartment}
onChangeOption={subDepartmentHandler}
isMulti={true}
/>
</div>
<Button className="isGrey formButton" text={"Add Function"} />
</>
);
};
export default CreateJobPage3;
所以你已经有了过滤,你缺少的是从 object 中获取subDepartments
属性,为此你可以使用map
,但因为你的subDepartments
本身是一个数组,我会使用flatMap
,否则结果将是[['sub1,'sub2']]
const subDepartments = departmentData.filter(item => {
return item.department === department;
}).flatMap(item => item.subDepartments);
这里有 2 个问题。 通过使用Array.filter
您的结果将是整个部门 object 的数组,而您只需要子部门。 在这种情况下,使用Array.find然后访问 subDepartments 数组要快一些。
const departmentData = [{ "department": "Sound Department", "subDepartments": [ "Supervising Sound Editor", "Dialog Editor", "Sound Designer", "Foley Artis", "Sound Recordist" ] }, { "department": "Camera Department", "subDepartments": [ "Camera Operator", "Second Assistant Camera", "Other Assistant Camera", "Steadycam Operator", "Focus Puller" ] }, { "department": "Production Department", "subDepartments": [ "Camera Operator", "Second Assistant Camera", "Other Assistant Camera", "Steadycam Operator", "Focus Puller" ] } ] let department = "Production Department" const subDepartments = departmentData.filter(item => { return item.department === department; }); console.log('Current Method:', subDepartments) const subDepartmentsNew = departmentData.find(item => { return item.department === department; }).subDepartments; console.log('New Method:', subDepartmentsNew)
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