什麼刷新視圖反應或代碼總是直播顯示?什麼時候在擴展Component的類中調用render()?
我有一個名爲removeAdmin和makeAdmin的函數,它將Admins添加和刪除用戶,然後當用戶是admin時,會員組件渲染和管理員屏蔽徽標呈現。它工作正常,但我想知道每次使用函數更改UI時是否觸發渲染,或者如果渲染實時監聽組件中的更改?
class MemberList extends Component {
constructor(props) {
super(props)
this.state = {
members: [],
loading: false,
administrators: []
}
this.makeAdmin = this.makeAdmin.bind(this)
this.removeAdmin = this.removeAdmin.bind(this)
}
componentDidMount(){
this.setState({loading:true})
fetch('https://api.randomuser.me/?nat=US&results=12')
.then(response => response.json())
.then(json => json.results)
.then(members => this.setState({
members,
loading:false
}))
}
makeAdmin(email){
const administrators = [
...this.state.administrators,
email
]
this.setState({administrators})
}
removeAdmin(email){
const administrators = this.state.administrators.filter(
adminEmail => adminEmail !== email
)
this.setState({administrators})
}
render() {
const { members, loading } = this.state
return (
<div className="member-list">
<h1>Society Members</h1>
{
(loading) ?
<span> loading...</span>:
<span>{members.length} members</span>
}
{ (members.length)?
members.map(
(member, i) =>
<Member key={i}
// This admin prop is worked out by enumerating through the administrator
// array with some(). some() passes in the enumerators, checking whether
// the current member in members.map() exists in the administrators array
// and returns admin=true if so.
admin={this.state.administrators.some(
adminEmail => adminEmail === member.email
)}
name={member.name.first + '' + member.name.last}
email={member.email}
thumbnail={member.picture.thumbnail}
makeAdmin={this.makeAdmin}
removeAdmin={this.removeAdmin}/>
):
<span>Currently 0 members</span>
}
</div>
)
和會員組分:
class Member extends Component {
componentWillMount(){
this.style={
backgroundColor: 'grey'
}
}
render() {
const { name, thumbnail, email, admin, makeAdmin, removeAdmin } = this.props
return (
<div className="member" style={this.style}>
<h1>{ name } {(admin) ? <FaShield/> : null}</h1>
<div>
<img src={ thumbnail }/>
</div>
<div>
{
(admin)?
<Button title="Make Admin" onClick={() => removeAdmin(email) } color="#841584"> Remove Admin </Button>
:
<Button title="Make Admin" onClick={() => makeAdmin(email) } color="#841584"> Make Admin </Button>
}
<a href={`mailto:${ email }`}><p> {email} </p></a>
</div>
</div>
)
}
}
export default Member
你剛剛問過什麼('我想知道每次使用函數更改UI時渲染是否被觸發,或者渲染是否實時監聽組件的變化?')是一個非常基本的React問題,你可以通過谷歌搜索在5分鐘內找到答案。 – DrunkDevKek