更新时间:2023-01-20 23:29:02
在第一个 select 元素上创建更改事件处理程序.然后调用一个方法,用它传递选定的值.然后对选定的值进行一些检查,以确定是否要显示下一个选择,然后显示列表.
Create a change event handler on the first select element. Then have that call a method, passing the selected value with it. Then do some checks on the selected values to determine if you want to show the next select and then the list.
*.html ------- template
<ion-content padding>
<ion-item>
<ion-label>State</ion-label>
<ion-select (ionChange)="setDistrictValues(sState)"[(ngModel)]="sState">
<ion-option [value]="sState" *ngFor="let sState of states">{{sState.name}} </ion-option>
</ion-select>
</ion-item>
<ion-item *ngIf="selectedDistricts">
<ion-label>District</ion-label>
<ion-select (ionChange)="setCityValues(sDistrict)" [(ngModel)]="sDistrict">
<ion-option [value]="sDistrict" *ngFor="let sDistrict of selectedDistricts">{{sDistrict.name}}</ion-option>
</ion-select>
</ion-item>
<ion-list *ngIf="selectedCities">
<ion-item *ngFor="let city of selectedCities">
<p>{{city.name}}</p>
</ion-item>
</ion-list>
*.ts ------- controller/component
public states: any[];
public districts: any[];
public cities: any[];
public selectedDistricts: any[];
public selectedCities: any[];
public sState: any;
public sDistrict: any;
appName = 'Ionic App';
constructor(public navController: NavController) {
this.initializeState();
this.initializeDistrict();
this.initializeCity();
}
initializeState(){
this.states = [
{id: 1, name: 'Melaka'},
{id: 2, name: 'Johor'},
{id: 3, name: 'Selangor'}
];
}
initializeDistrict(){
this.districts = [
{id: 1, name: 'Alor Gajah', state_id: 1, state_name: 'Melaka'},
{id: 2, name: 'Jasin', state_id: 1, state_name: 'Melaka'},
{id: 3, name: 'Muar', state_id: 2, state_name: 'Johor'},
{id: 4, name: 'Segamat', state_id: 2, state_name: 'Johor'},
{id: 5, name: 'Shah Alam', state_id: 3, state_name: 'Selangor'},
{id: 7, name: 'Klang', state_id: 3, state_name: 'Selangor'}
];
}
initializeCity(){
this.cities = [
{id: 1, name: 'City of Alor Gajah 1', state_id: 1, district_id: 1},
{id: 2, name: 'City of Alor Gajah 2', state_id: 1, district_id: 1},
{id: 3, name: 'City of Jasin 1', state_id: 1, district_id: 2},
{id: 4, name: 'City of Muar 1', state_id: 2, district_id: 3},
{id: 5, name: 'City of Muar 2', state_id: 2, district_id: 3},
{id: 6, name: 'City of Segamat 1', state_id: 2, district_id: 4},
{id: 7, name: 'City of Shah Alam 1', state_id: 3, district_id: 5},
{id: 8, name: 'City of Klang 1', state_id: 3, district_id: 6},
{id: 9, name: 'City of Klang 2', state_id: 3, district_id: 6}
];
}
setDistrictValues(sState) {
this.selectedDistricts = this.districts.filter(district => district.state_id == sState.id)
}
setCityValues(sDistrict) {
this.selectedCities = this.cities.filter(city => city.district_id == sDistrict.id);
}
选择您所在的州,仅筛选 state_id 与所选州 ID 匹配的地区.城市也是如此.
Select your state, filter for only the districts that have a state_id that matches the selected state ID. The same thing is done for the cities.