[英]Material React Select Multiple: How i can remove from my array when i click in a selected element?
我正在关注这个CodeSandBox示例,了解如何进行多种材料选择。
这是我的array
,具有所有可能的选项:
const permissionsGroupList = [
{ name: 'Sellers' },
{ name: 'Admins' }
];
这是我选择的选项的状态:
const [groupPermissions, setGroupPermissions] = useState([]);
我添加所选选项的功能:
const handleChangeGroupPermissions = event => {
setGroupPermissions(event.target.value);
};
我的模板组件:
<InputLabel id="mult-check-permissions">Grupo de permissões</InputLabel>
<Select
labelId="mult-check-permissions"
id="demo-mutiple-checkbox"
multiple
label="Grupo de permissões"
onChange={handleChangeGroupPermissions}
value={groupPermissions}
input={<Input disableUnderline={true} />}
renderValue={selected =>
selected.map(value => <Chip key={value.id} label={value.name} />)
}
>
{permissionsGroupList.map(permissionGroup => (
<MenuItem
key={permissionGroup.name}
value={{ name: permissionGroup.name }}
>
<Checkbox
checked={groupPermissions.some(
group => group.name === permissionGroup.name
)}
/>
<ListItemText primary={permissionGroup.name} />
</MenuItem>
))}
</Select>
在示例中,当我选择一个已选择的选项时,元素将从数组groupPermissions
删除。 在我的例子中,当我点击一个已经选择的选项时,这个元素再次放入数组中。
我还需要做些什么才能获得与沙箱示例类似的结果?
我看到沙箱 Select 以字符串数组的形式获取数据,因此您可以简单地将 permissionsGroupList 映射为字符串数组,而不使用name
属性。
const Select = MaterialUI.Select; const Input = MaterialUI.Input; const Chip = MaterialUI.Chip; const MenuItem = MaterialUI.MenuItem; const Checkbox = MaterialUI.Checkbox; const ListItemText = MaterialUI.ListItemText; const permissionsGroupList = [ { name: 'Sellers' }, { name: 'Admins' }, ].map(p => p.name);//data in sandbox is NOT an array of objects const App = () => { const [ groupPermissions, setGroupPermissions, ] = React.useState([]); const handleChangeGroupPermissions = e => { setGroupPermissions(e.target.value); }; return ( <Select labelId="mult-check-permissions" id="demo-mutiple-checkbox" multiple label="Grupo de permissões" value={groupPermissions} input={<Input disableUnderline={true} />} onChange={handleChangeGroupPermissions} renderValue={selected => selected.map(val => <Chip key={val} label={val} />) } > {permissionsGroupList.map(permissionGroup => ( <MenuItem key={permissionGroup} value={permissionGroup} > <Checkbox checked={groupPermissions.includes( permissionGroup )} value={permissionGroup} /> <ListItemText primary={permissionGroup} /> </MenuItem> ))} </Select> ); }; ReactDOM.render(<App />, document.getElementById('root'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.8.4/umd/react.production.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.8.4/umd/react-dom.production.min.js"></script> <script src="https://unpkg.com/@material-ui/core@4.9.7/umd/material-ui.production.min.js"></script> <div id="root"></div>
是的,您的解决方案只是将一个新项目添加到您的groupPermissions
数组中。
你应该做什么:
groupPermissions
所以你的手柄选项应该是这样的:
const handleChangeGroupPermissions = event => {
const { value } = event.target;
if (groupsPermissions.includes(value) {
// deep clone from your object array
const newGroupsPermissions = JSON.parse(JSON.stringify(groupPermissions ));
newGroupsPermissions = newGroupsPermissions.filter(item => {
return item.name !== value;
});
setGroupPermissions(newGroupsPermissions);
} else {
setGroupPermissions([...groupsPermissions, { name: value }]);
}
};
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