Angular 4中的升序和降序排序 [英] Ascending and Descending Sort in Angular 4
问题描述
为什么排序功能起作用:
Why is it that sort function is working :
<th (click)="sort('transaction_date')">Transaction Date <i class="fa" [ngClass]="{'fa-sort': column != 'transaction_date', 'fa-sort-asc': (column == 'transaction_date' && isDesc), 'fa-sort-desc': (column == 'transaction_date' && !isDesc) }" aria-hidden="true"> </i></th>
这不起作用的时候:
<th (click)="sort('user.name')">User <i class="fa" [ngClass]="{'fa-sort': column != 'user.name', 'fa-sort-asc': (column == 'user.name' && isDesc), 'fa-sort-desc': (column == 'user.name' && !isDesc) }" aria-hidden="true"> </i></th>
html
html
<tr *ngFor="let inner of order.purchase_orders | orderBy: {property: column, direction: direction}">
<td>{{ inner.transaction_date | date }}</td>
<td>{{ inner.user.name }}</td>
</tr>
ts
sort(property){
this.isDesc = !this.isDesc; //change the direction
this.column = property;
this.direction = this.isDesc ? 1 : -1;
console.log(property);
};
管道
import {Pipe, PipeTransform} from '@angular/core';
@Pipe({
name: 'orderBy'
})
export class OrderByPipe implements PipeTransform {
transform(records: Array<any>, args?: any): any {
if(records && records.length >0 ){
return records.sort(function(a, b){
if(a[args.property] < b[args.property]){
return -1 * args.direction;
}
else if( a[args.property] > b[args.property]){
return 1 * args.direction;
}
else{
return 0;
}
});
}
};
}
谢谢.
推荐答案
这里的问题是:
The issue here is :
对象的嵌套属性,orderBy必须提供排序依据 一级属性的基础
Nested property of object, orderBy must be providing the sorting on the basis of first level of properties
我正在考虑,inner
应该看起来像这样
I am considering, inner
should be look like this,
{
transaction_date : '10/12/2014'
user : {
name : 'something',
...
}
}
尝试使该对象像在第一级上采用所有可排序的属性 (或者您必须通过这种方式更改order)
try to make this object like, take all sortable property on first level ( OR you must have to change the orderBy that way )
{
transaction_date : '10/12/2014'
user_name : 'something',
user : {
name : 'something',
...
}
}
然后尝试.
<th (click)="sort('user_name')">
User <i class="fa" [ngClass]="{'fa-sort': column != 'user_name',
'fa-sort-asc': (column == 'user_name' && isDesc),
'fa-sort-desc': (column == 'user_name' && !isDesc) }"
aria-hidden="true">
</i>
</th>
将records.map(record => record['user_name'] = record.user.name);
添加到您的transform
函数中,如下所示:
Add records.map(record => record['user_name'] = record.user.name);
, to your transform
function , like this :
这将使对象符合我的建议:
This will make the object as I suggested :
export class OrderByPipe implements PipeTransform {
transform(records: Array<any>, args?: any): any {
if(records && records.length >0 ){
records.map(record => record['user_name'] = record.user.name); // add here
return records.sort(function(a, b){
....
}
};
}
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