[英]How to insert a dropdown using React JS
import React, { Component } from 'react'; import { Link } from 'react-router' import { Dropdown, DropdownMenu, DropdownItem, Progress } from 'reactstrap'; import Session from 'redux-react-session'; import BeaconSettings from '../BeaconSettings'; class NewBeacon extends Component { constructor(props) { super(props); this.state = {inputname: '', inputdescription: '' , inputzone: '' , inputstore: '' , inputfloor: ''}; this.handleName = this.handleName.bind(this); this.handleDescription = this.handleDescription.bind(this); this.handleZone = this.handleZone.bind(this); this.handleStore = this.handleStore.bind(this); this.handleFloor = this.handleFloor.bind(this); this.handleSubmit = this.handleSubmit.bind(this); // alert("hey"); this.toggleStore = this.toggleStore.bind(this); this.toggleFloor = this.toggleFloor.bind(this); this.toggleZone = this.toggleZone.bind(this); this.state = { dropdownZone: false }; this.state ={ dropdownStore: false }; this.state ={ dropdownFloor: false }; this.state = { data:[ {name:"Nikko Laus1"}, {name:"Sam Collins"}, {name:"Carl Smith Wesson"} ], store:[ {name:"abcd"}, {name:"Sam Collins"}, {name:"Carl Smith Wesson"} ], floor:[ {name:"Ist"}, {name:"IInd"}, {name:"IIIrd"} ] }; } static contextTypes = { router: React.PropTypes.object.isRequired } handleSubmit(event){ alert('Submitted: ' + this.state.inputname + this.state.inputdescription + this.state.inputzone + this.state.inputstore + this.state.inputfloor); event.preventDefault(); this.context.router.push('/components/BeaconSettings'); } toggleZone() { this.setState({ dropdownZone: !this.state.dropdownZone }); } toggleStore() { this.setState({ dropdownStore: !this.state.dropdownStore }); } toggleFloor() { this.setState({ dropdownFloor: !this.state.dropdownFloor }); } handleName(event) { this.setState({inputname: event.target.value}); } handleDescription(event){ this.setState({inputdescription: event.target.value}); } handleZone(event){ this.setState({inputzone: event.target.value}); } handleFloor(event){ this.setState({inputfloor: event.target.value}); } handleStore(event){ this.setState({inputstore: event.target.value}); } render() { let Zone = this.state.data.map(person => { return <DropElement key={person.id} data={person}/> }); let Store = this.state.store.map(person => { return <DropElement key={person.id} data={person}/> }); let Floor = this.state.floor.map(person => { return <DropElement key={person.id} data={person}/> }); return (<div><div> <div className="animated fadeIn"> <br /><div className="card" style={{ width: 77 + '%' }}> <div className="card-header"> Create Beacon </div> <div className="card-block"> <div className="input-group mb-1"> <span className="input-group-addon"><i className="icon-user"></i></span> <input type="text" className="form-control" value={this.state.inputname} onChange={this.handleName} placeholder="Name" /> </div> <div className="input-group mb-1"> <span className="input-group-addon"><i className="fa fa-align-justify"></i></span> <input type="textArea" value={this.state.inputdescription} onChange={this.handleDescription} className="form-control" placeholder="Description"/> </div> <div className="card-header"> Select a zone</div> <div className="card-block"><div className="px-1 row">Zone: <div className="px-2 mb-1"> <Dropdown isOpen={this.state.dropdownZone} toggle={this.toggleZone}> <input type="text" value={this.state.inputzone} onChange={this.handleZone} className="caret" placeholder="Select a Zone" onClick={this.toggleZone} data-toggle="dropdown" aria-haspopup="true" aria-expanded={this.state.dropdownZone} /> <DropdownMenu> <DropdownItem>{Zone}<divider /></DropdownItem> </DropdownMenu> </Dropdown></div></div></div> <div className="card-header"> Select a Store</div> <div className="card-block"><div className="px-1 row">Store: <div className=" px-2 mb-1"> <Dropdown isOpen={this.state.dropdownStore} toggle={this.toggleStore}> <input type="text" value={this.state.inputstore} onChange={this.handleStore} className="caret" placeholder="Select a Store" onClick={this.toggleStore} data-toggle="dropdown" aria-haspopup="true" aria-expanded={this.state.dropdownStore} /> <DropdownMenu> <DropdownItem>{Store}<divider /></DropdownItem> </DropdownMenu> </Dropdown> </div></div></div> <div className="card-header"> Select a floor</div> <div className="card-block"><div className="px-1 row">Floor: <div className=" px-2 mb-1"> <Dropdown isOpen={this.state.dropdownFloor} toggled={this.toggleFloor}> <input type="text" value={this.state.inputfloor} onChange={this.handleFloor} placeholder="Select a Floor" onClick={this.toggleFloor} data-toggled="dropdown" aria-haspopup="true" aria-expanded={this.state.dropdownFloor} /> <DropdownMenu> <DropdownItem>{Floor}<divider /></DropdownItem> </DropdownMenu> </Dropdown></div></div></div> </div> </div> </div> </div> <div className="px-2 row" style={{ width: 90 + '%' }}> <div><button className="nav-link btn btn-block btn-success" onClick={this.handleSubmit} activeClassName="active"> Next</button> </div><div className="px-2"><Link to={'/components/social-buttons'} className="nav-link btn btn-block btn-danger" activeClassName="active"> Cancel</Link> </div> <div className="float-right"><Link to={'/components/social-buttons'} className="nav-link btn btn-block btn-success" activeClassName="active"> Default Notification </Link></div> </div></div> ) } } class DropElement extends React.Component { constructor() { super(); } render() { return (<DropdownItem>{this.props.data.name} </DropdownItem> ); } } export default NewBeacon;
这是我的代码,我想使用尝试过的React JS插入下拉菜单,但这不是正确的方法,也不是应用下拉菜单的方法,因此如何处理该问题,我希望使用数组完成动态处理
怎么不需要每个Dropdowntype都有单独的句柄函数,而不是将标识符传递给为您完成工作的onChange函数。 同样,在构造函数中,您应该在一个this.state
广告中定义所有状态变量,而不要创建多个状态变量。 我希望这有帮助
import React, { Component } from 'react';
import { Link } from 'react-router'
import { Dropdown, DropdownMenu, DropdownItem, Progress } from 'reactstrap';
import Session from 'redux-react-session';
import BeaconSettings from '../BeaconSettings';
class NewBeacon extends Component {
constructor(props) {
super(props);
this.state = {inputname: '',
inputdescription: '' ,
inputzone: '' ,
inputstore: '' ,
inputfloor: '',
dropdownZone: false,
dropdownStore: false,
dropdownFloor: false,
data:[
{name:"Nikko Laus1"},
{name:"Sam Collins"},
{name:"Carl Smith Wesson"}
],
store:[
{name:"abcd"},
{name:"Sam Collins"},
{name:"Carl Smith Wesson"}
],
floor:[
{name:"Ist"},
{name:"IInd"},
{name:"IIIrd"}
]
};
this.handleName = this.handleName.bind(this);
this.handleDescription = this.handleDescription.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
this.handleChange = this.handleChange.bind(this);
this.toggleDropdown = this.toggleDropdown.bind(this);
// alert("hey");
}
static contextTypes = {
router: React.PropTypes.object.isRequired
}
handleSubmit(event){
alert('Submitted: ' + this.state.inputname + this.state.inputdescription + this.state.inputzone + this.state.inputstore + this.state.inputfloor);
event.preventDefault();
this.context.router.push('/components/BeaconSettings');
}
toggleDropdown(dropType) {
this.setState({[dropType]: !this.state[dropType]})
}
handleName(event) {
this.setState({inputname: event.target.value});
}
handleDescription(event){
this.setState({inputdescription: event.target.value});
}
handleChange(event, type) {
this.setState({[type]: event.target.value});
}
render() {
let Zone = this.state.data.map(person =>
{
return <DropElement key={person.id} data={person}/>
});
let Store = this.state.store.map(person =>
{
return <DropElement key={person.id} data={person}/>
});
let Floor = this.state.floor.map(person =>
{
return <DropElement key={person.id} data={person}/>
});
return (<div><div>
<div className="animated fadeIn">
<br /><div className="card" style={{ width: 77 + '%' }}>
<div className="card-header">
Create Beacon
</div>
<div className="card-block">
<div className="input-group mb-1">
<span className="input-group-addon"><i className="icon-user"></i></span>
<input type="text" className="form-control" value={this.state.inputname} onChange={this.handleName} placeholder="Name" />
</div>
<div className="input-group mb-1">
<span className="input-group-addon"><i className="fa fa-align-justify"></i></span>
<input type="textArea" value={this.state.inputdescription} onChange={this.handleDescription} className="form-control" placeholder="Description"/>
</div>
<div className="card-header">
Select a zone</div>
<div className="card-block"><div className="px-1 row">Zone:
<div className="px-2 mb-1">
<Dropdown isOpen={this.state.dropdownZone} toggle={this.toggleDropdown.bind(this, 'dropdownZone'}>
<input type="text" value={this.state.inputzone} onChange={this.handleChange.bind(this, 'inputzone'} className="caret" placeholder="Select a Zone"
onClick={this.toggleDropdown.bind(this, 'dropdownZone'}} data-toggle="dropdown" aria-haspopup="true" aria-expanded={this.state.dropdownZone} />
<DropdownMenu>
{Zone}
</DropdownMenu>
</Dropdown></div></div></div>
<div className="card-header">
Select a Store</div>
<div className="card-block"><div className="px-1 row">Store:
<div className=" px-2 mb-1">
<Dropdown isOpen={this.state.dropdownStore} toggle={this.toggleDropdown.bind(this, 'dropdownStore'}}>
<input type="text" value={this.state.inputstore} onChange={this.handleChange.bind(this, 'inputstore')} className="caret" placeholder="Select a Store"
onClick={this.toggleDropdown.bind(this, 'dropdownStore'}} data-toggle="dropdown" aria-haspopup="true" aria-expanded={this.state.dropdownStore} />
<DropdownMenu>
{Store}
</DropdownMenu>
</Dropdown>
</div></div></div>
<div className="card-header">
Select a floor</div>
<div className="card-block"><div className="px-1 row">Floor:
<div className=" px-2 mb-1">
<Dropdown isOpen={this.state.dropdownFloor} toggled={this.toggleDropDown.bind(this, 'dropdownFloor')}>
<input type="text" value={this.state.inputfloor} onChange={this.handleChange.bind(this, 'inputfloor')} placeholder="Select a Floor"
onClick={this.toggleDropdown.bind(this, 'dropdownFloor')} data-toggled="dropdown" aria-haspopup="true" aria-expanded={this.state.dropdownFloor} />
<DropdownMenu>
{Floor}
</DropdownMenu>
</Dropdown></div></div></div>
</div>
</div>
</div>
</div>
<div className="px-2 row" style={{ width: 90 + '%' }}>
<div><button className="nav-link btn btn-block btn-success" onClick={this.handleSubmit} activeClassName="active">
Next</button>
</div><div className="px-2"><Link to={'/components/social-buttons'} className="nav-link btn btn-block btn-danger" activeClassName="active"> Cancel</Link>
</div>
<div className="float-right"><Link to={'/components/social-buttons'} className="nav-link btn btn-block btn-success" activeClassName="active">
Default Notification
</Link></div>
</div></div>
)
}
}
class DropElement extends React.Component
{
constructor()
{
super();
}
render()
{
return (<DropdownItem>{this.props.data.name}
</DropdownItem>
);
}
}
export default NewBeacon;
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