我有一个 ngFor 循环,在 ionic 6 搜索栏中包含重复的数据。我已经证明了“trackBy”和“map”。
我知道这个网站上有相同的主题,但是从 2020 年开始的,也许有一些新的方式。
¿有人知道另一种方法吗?
谢谢你。
page.ts:
handleInput(event) {
this.text= event.target.value;
let body= new FormData();
body.append('busqueda', this.text)
this.http.post(this._ABSPATH_+'/app/complexsearch/', body).subscribe(res=>{
// Dado que es un proceso cíclico, hay que volver a poner toto a 0
this.showList4=false;
this.showList1=false;
this.showList3=false;
this.showList2=false;
this.showList5=false;
this.muni=res;
if(this.text && this.text.trim != null){
this.show=true;
this.searchedMun= this.muni;
this.searchedMun1= this.muni;
this.searchedMun2= this.muni;
this.searchedMun3= this.muni;
this.searchedMun4= this.muni;
for(let i=0; i<this.muni.length; i++){
this.miType=this.muni[i].busquedatipo;
let miTit=this.muni[i].titulo;
if(this.miType=='evento'){
this.searchedMun= this.searchedMun.filter((muni:any)=>{
return (muni.titulo);
})
this.showList=true;
}
if(this.miType=='provincia'){
this.searchedMun1= this.searchedMun1.filter((muni:any)=>{
return (muni.provincia);
})
this.showList1=true;
}
if(this.miType=='municipio'){
this.searchedMun2= this.searchedMun2.filter((muni:any)=>{
return (muni.municipio);
})
this.showList2=true;
}
if(this.miType=='ubicacion'){
this.searchedMun3= this.searchedMun3.filter((muni:any)=>{
return (muni.nombre);
})
this.showList3=true;
}
}
}
})// Fin petición POST
}
page.html:
<ion-searchbar value="" show-clear-button="focus" placeholder="Buscar evento, categoría o localización" color="light" search-icon="search-sharp" [debounce]="300"
(ionInput)="handleInput($event)" (ionClear)="cancel()"></ion-searchbar>
<ion-card id="listSearch" *ngIf="show">
<ion-card-content>
<ion-list *ngIf="showList">
<ion-label>Eventos</ion-label>
<ion-item *ngFor="let mun of searchedMun" [routerLink]="['/ficha-evento',mun.code]">
<ion-label>{{mun.titulo}}</ion-label>
</ion-item>
</ion-list>
<ion-list *ngIf="showList1">
<ion-label>Provincia</ion-label>
<ion-item *ngFor="let mun of searchedMun1" [routerLink]="['/reel2',mun.provincia,'provincia']">
<ion-label>{{mun.provincia}} <span class="diferenciar">Provincia</span></ion-label>
</ion-item>
</ion-list>
<ion-list *ngIf="showList2">
<ion-label>Municipios</ion-label>
<ion-item *ngFor="let mun of searchedMun2" [routerLink]="['/reel2',mun.municipio,'municipio']">
<ion-label>{{mun.municipio}} <span class="diferenciar">Municipio</span></ion-label>
</ion-item>
</ion-list>
<ion-list *ngIf="showList3">
<ion-label>Lugares</ion-label>
<ion-item *ngFor="let mun of searchedMun3" [routerLink]="['/reel2',mun.municipio,'municipio']">
<ion-label>{{mun.nombre}} <span class="diferenciar">Municipio</span></ion-label>
</ion-item>
</ion-list>
</ion-card-content>
</ion-card>
每个元素都有不同的索引,因此“trackBy:索引不起作用”。
最后我用另一种过滤方法解决了这个问题,如这篇文章所示:
我的代码是:
if(this.miType=='provincia'){
this.searchedMun1= this.searchedMun1.filter((muni:any)=>{
return (muni.provincia);
})
this.test=[
...new Map(this.searchedMun1.map(item=>[item.provincia,item])).values()
]
this.showList1=true;
}
后来在 *ngFor 中,我调用“test”而不是“searchedMuni”。