![](/img/trans.png)
[英]How many times does React.js instantiate its components when user browses a SPA app?
[英]How to rerender unrelated components when a dropdown changes its selected value in react.js
我有一個包含帳戶名稱和帳戶 ID 的下拉列表。 下拉列表是我的 NavMenu.js 中名為 AccountsDropdown 的子項
render () {
return (
<header>
<Navbar className="navbar-expand-sm navbar-toggleable-sm ng-white border-bottom box-shadow mb-3" light>
<Container>
<div><NavbarBrand className="brand-name" tag={Link} to="/">PABST</NavbarBrand><br />
<NavbarText className="sub-headline" to="/">Budget Allocation & Forecasting</NavbarText></div>
<NavbarToggler onClick={this.toggleNavbar} className="mr-2" />
<AccountsDropdown></AccountsDropdown>
<Collapse className="d-sm-inline-flex flex-sm-row-reverse center-align-flex margin-right" isOpen={!this.state.collapsed} navbar>
<ul className="navbar-nav flex-grow">
<NavItem>
<NavLink tag={Link} id={"budgetplanner"} onClick={() => this.handleChange("budgetplanner")} className={"budgetplanner" === this.state.selectedNavItem ? "active" : "inactive"} to="/"><EventNoteIcon ></EventNoteIcon>Budget Planner</NavLink>
</NavItem>
<NavItem>
<NavLink tag={Link} id={"budgetresults"} onClick={() => this.handleChange("budgetresults")} className={"budgetresults" === this.state.selectedNavItem ? "active" : "inactive"} to="/budget-results"><PieChartRoundedIcon></PieChartRoundedIcon>Budget Results</NavLink>
</NavItem>
<NavItem>
<NavLink tag={Link} id={"docs"} onClick={() => this.handleChange("docs")} className={"docs" === this.state.selectedNavItem ? "active" : "inactive"} to="/fetch-data"><FolderRoundedIcon></FolderRoundedIcon>Docs</NavLink>
</NavItem>
</ul>
</Collapse>
Redux 不是強制實現這一點的。 向 BudgetResults & AccountsDropdown 添加一個共同的祖先。 將狀態向上移動到這個祖先。 然后,您可以使用 prop 回調或 Context API 來實現它。
"
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.