我正在构建一个离子3应用程序,我面临一个奇怪的问题。 我最近将此模块添加到我的应用程序以启用数据缓存: https://www.npmjs.com/package/ionic-cache
它适用于我的应用程序中的所有页面,除了以下一页:
<ion-header>
<ion-navbar>
<ion-title>{{navParams.get('name')}}</ion-title>
</ion-navbar>
</ion-header>
<ion-content padding>
<ion-segment [(ngModel)]="view">
<ion-segment-button value="info">
Info
</ion-segment-button>
<ion-segment-button value="recensioni">
Recensioni
</ion-segment-button>
</ion-segment>
<div [ngSwitch]="view">
<div id="info">
<div *ngSwitchCase="'info'">
<div class="flexBox">
<div *ngIf="details != undefined" [style.background]="(details.open_now) ? 'green' : 'red'"></div>
<span *ngIf="details != undefined && details.open_now">Aperto</span>
<span *ngIf="details != undefined && !details.open_now">Chiuso</span>
<ion-icon name="call" (click)="call()"></ion-icon>
<ion-icon name="navigate" (click)="navigateTo()"></ion-icon>
</div>
</div>
<div #map2 [style.height]="(view == 'info') ? '35vh' : '0px'"></div>
<div *ngSwitchCase="'info'" id="slides">
<ion-slides *ngIf="details != undefined">
<ion-slide *ngFor="let img of details.photos" (click)="openImg($event)">
<img [src]="'https://maps.googleapis.com/maps/api/place/photo?key=AIzaSyD_9bj_Ao6nklX7PWrM_1E-iDH4EPVWV6A&maxwidth=1600&photoreference=' + img.photo_reference" />
</ion-slide>
</ion-slides>
</div>
</div>
<div id="rec">
<div *ngSwitchCase="'recensioni'">
<ion-list-header>
<div id="avg">
<div>
<span item-start text-wrap>Voto Google: </span>
<span item-end text-wrap class="end" *ngIf="navParams.get('rating') != undefined">{{navParams.get('rating')}}/5</span>
<span item-end text-wrap class="end" *ngIf="navParams.get('rating') == undefined">Nessuna valutazione!</span>
</div>
<div>
<span item-start text-wrap class="start">Voto Tripadvisor: </span>
<ion-spinner item-end text-wrap class="end" *ngIf="!loaded" name="dots"></ion-spinner>
<span item-end text-wrap class="end" *ngIf="loaded && rating != undefined">{{rating}}/5</span>
<span item-end text-wrap class="end" *ngIf="loaded && rating == undefined">Nessuna valutazione!</span>
</div>
</div>
</ion-list-header>
<ion-list>
<ion-item *ngFor="let recensione of reviews">
<div class="center">
<ion-avatar>
<img [src]="recensione.profile_photo_url">
</ion-avatar>
</div>
<p class="name">{{recensione.author_name}}</p>
<div class="rating">
<div class="star-ratings-sprite">
<span [style.width]="(100*recensione.rating/5) + '%'" class="star-ratings-sprite-rating"></span>
</div>
</div>
<div *ngIf="recensione.title != undefined" class="title">
<span text-wrap>{{recensione.title}}</span>
</div>
<span class="review" text-wrap>{{recensione.text}}</span>
<div class="date">
<p>{{recensione.relative_time_description}}</p>
</div>
</ion-item>
</ion-list>
<ion-spinner *ngIf="!loaded"></ion-spinner>
<ion-infinite-scroll (ionInfinite)="scrapeNext($event)" threshold="1000px">
<ion-infinite-scroll-content></ion-infinite-scroll-content>
</ion-infinite-scroll>
</div>
</div>
</div>
</ion-content>
在此页面中,我显示了有关特定餐厅的信息和评论(评论显示在离子列表中)。 要检索评论,我在.ts文件中使用了以下代码:
this.scraper.getTaReviews(this.navParams.get('name'))
.subscribe(data => {
console.log(data)
if (data != "no data") {
this.placeId = data.placeId;
this.risId = data.risId;
this.hasNext = data.hasNext;
this.rating = data.avgRating;
this.reviews = this.reviews.concat(data.reviews);
console.log(this.reviews);
}
this.loaded = true;
})
显然,我在构造函数中启动了review变量为空数组。
这是调用http调用的函数:
getTaReviews(ris: string) {
let request = this.http.get(this.hostname + ':8090/tarev?ris=' + ris + '&citta=' + this.share.getProvincia()).map(res => res.json()).retry();
return this.cache.loadFromObservable(ris + "-" + this.share.getProvincia(), request);
// return this.http.get(this.hostname + ':8090/tarev?ris=' + ris + '&citta=' + this.share.getProvincia()).map(res => res.json()).retry();
}
未注释的部分是新部分,注释部分是旧工作部分。 我的问题是,当我第一次打开页面并获取数据时,一切正常,并且离子列表中的评论正确显示。但是,当我使用缓存数据时,即使reviews数组包含正确的数据(我在控制台日志中检查过),也不会填充列表中的ion-items。正如我之前所说,如果我不使用离子缓存,它可以正常工作,但我无法解释为什么这种行为只影响这个页面。此外,所有其他缓存数据(评论除外)都正确显示,看起来它只是与ngFor语句有关。
答案 0 :(得分:0)
我设法解决了这个问题,但它仍然有点奇怪。 如果我以这种方式添加超时,它会完美地运行:
this.scraper.getTaReviews(this.navParams.get('name'))
.subscribe(data => {
console.log(data)
if (data != "no data") {
this.placeId = data.placeId;
this.risId = data.risId;
this.hasNext = data.hasNext;
this.rating = data.avgRating;
setTimeout(_ => this.reviews = this.reviews.concat(data.reviews), 1000);
console.log(this.reviews);
}
this.loaded = true;
})