我从本地存储在项目中的JSON文件中获取数据。 JSON字符串是位置的阵列,其结构是如下所示:如何在Ionic中实现搜索和过滤
JSON文件
{
"locations": [
{
"title": "ABC",
"latitude": -1.2596551,
"longitude": 36.7066604,
"routes":["22","23","105","115"],
"fare":[],
"matatu":[]
},
{
"title": "Adams Arcade",
"latitude": -1.3004204,
"longitude": 36.7770793,
"routes": ["2","4W","102","24","24C","111"],
"fare":[],
"matatu":[]
},
{
"title":"Aga Khan Hospital",
"latitude":-1.2620125,
"longitude":36.8186399,
"routes":["11A","11F","106","107","116"],
"fare":[],
"matatu":[]
}
]
}
而不是滤波在具有管飞中的数据,我在provider
实现的功能来处理这个问题。下面的代码:
import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import 'rxjs/add/operator/map';
import { Geolocation } from '@ionic-native/geolocation';
@Injectable()
export class LocationProvider {
data: any;
constructor(public http: Http, public geolocation: Geolocation) {
}
load(){
if(this.data){
return Promise.resolve(this.data);
}
return new Promise(resolve => {
this.http.get('assets/data/locations.json').map(res => res.json()).subscribe(data => {
this.data = this.applyHarvesine(data.locations);
this.data.sort((locationA, locationB) => {
return locationA.distance - locationB.distance;
});
resolve(this.data);
});
});
}
filterLocations(searchTerm){
return this.data.filter((location) => {
return location.title.toLowerCase().indexOf(searchTerm.toLowerCase()) > -1;
});
}
}
filterLocations()
的功能是取searchTerm
,并返回包含仅符合搜索条件的所述元素的数组。
以下是.ts
和.html
代码,用于呈现它的页面。
.TS
import { Component } from '@angular/core';
import { IonicPage, NavController } from 'ionic-angular';
import { LocationProvider } from '../../providers/location/location';
import { PlaceDetailsPage } from '../place-details/place-details';
@IonicPage()
@Component({
selector: 'page-places',
templateUrl: 'places.html',
})
export class PlacesPage {
searchTerm: string = '';
constructor(public navCtrl: NavController, public locations: LocationProvider) {
}
ionViewDidLoad() {
this.setFilteredLocations();
}
setFilteredLocations(){
return this.locations.filterLocations(this.searchTerm);
}
}
的.html
<ion-content>
<ion-searchbar [(ngModel)]="searchTerm" (ionInput)="setFilteredLocations()"></ion-searchbar>
<ion-list no-lines>
<button ion-item *ngFor="let location of locations.data">
<ion-avatar item-left>
<ion-icon name="pin"></ion-icon>
</ion-avatar>
<h2>{{location.title}}</h2>
<p>{{location.distance}} km</p>
</button>
</ion-list>
</ion-content>
当在搜索栏用户类型,setFilteredLocation()
被称为触发数据的滤波。问题是,没有任何反应。
我哪里出错了?我的直觉是setFilteredLocation()
函数中有什么不对劲,但我不知道它是什么。
是否有其他方法来搜索和过滤不涉及管道?
我不知道足够的离子来可以肯定,但是不应该在'filterLocations'之前调用'load'?如果没有'data',这将是预期的行为 – EdoPut