Solving More Hook Problems: An Easy Guide
P粉883278265
2023-08-14 13:19:01
<p>I'm having some problems with hooks in my project. This is a function that checks user permissions and returns true or false.</p>
<pre class="brush:php;toolbar:false;">import { useSelector } from "react-redux";
const CheckPermission = (module_key, permission_key) => {
const { user } = useSelector((state) => ({
user: state.auth.user,
}));
const rolePermissions = user?.role?.role_permissions ?? [];
const return_value = !!rolePermissions.find(
(p_list) =>
p_list.module?.key === module_key &&
p_list.permission?.key === permission_key
);
return return_value;
};
export default CheckPermission;</pre>
<p>然后我在我的侧边栏组件中使用它</p>
<pre class="brush:php;toolbar:false;">const renderMenu = (menu, key) => {
if (!CheckPermission(menu.moduleKey, menu.permissionKey)) {
return null;
}
return (
<Tooltip title={menu.name} placement="right" key={key}>
<NavLink
activeClassName={styles.active}
exact
className={styles.item}
to={menu.path}
>
<span className={styles.iconBox}>{menu.icon}</span>
<span className={styles.itemText}> {menu.name}</span>
</NavLink>
</Tooltip>
);
};
export default ({ collapse, onCollapse, isAdmin }) => {
const { user } = useSelector((state) => ({
user: state.auth.user,
}));
return (
<Layout.Sider
theme="light"
className={classnames(styles.sider, collapse ? styles.collapsed : "")}
collapsible
collapsed={collapse}
onCollapse={onCollapse}
width={collapse ? 64 : 264}
onBreakpoint={() => {}}
breakpoint="xl"
style={{
overflow: "auto",
height: "100vh",
position: "fixed",
left: 0,
top: 0,
paddingTop: "50px",
}}
>
<div className={styles.action}>
{user && user.read_only
? menus.map((menu, i) => {
if (menu.name === "Харилцагч") {
return renderMenu(menu, i);
} else {
return (
menu &&
menu.children &&
// eslint-disable-next-line array-callback-return
menu.children.map((submenu, j) => {
if (submenu.name === "QR данс") {
return (
<div key={i} className={styles.parentnav}>
{renderMenu(submenu, j)}
</div>
);
}
})
);
}
})
: menus.map((menu, i) => {
if (menu.path) {
return renderMenu(menu, i);
} else {
return (
<div key={i} className={styles.parentnav}>
{menu.name ? (
<div
className={`${styles.navlabel} ${styles.partentText}`}
>
{menu.name}
</div>
) : null}
{menu.children.map((submenu, j) => {
if (!submenu.path) return null;
if (isAdmin) {
return renderMenu(submenu, j);
} else {
return null;
}
})}
</div>
);
}
})}
</div>
</Layout.Sider>
);
};</pre>
<p>但是它抛出了"Error: Rendered more hooks than during the previous render.",我该如何在其他地方正确使用我的checkPermission函数。</p>
<p>我尝试在循环中使用checkPermission函数,结果是一样的。</p>
"Error: Rendering with more hooks than the last render" usually occurs when you use React hooks (such as useSelector) in a way that violates the hooks rules. The rules state that hooks must always be called at the top level of a functional component, and not within loops, conditionals, or nested functions. In your code, you seem to be using the CheckPermission function in a loop and conditional.