[英]why Custom Pipe Doesn't work with local Template variables in Angular 2
我有一个管道只是作为例子,它平方它收到的值低于一个工作正常
模板
<input type = "number" placeholder = "Enter number for which square is to be calculated" [(ngModel)] = "value">
<p>Squared Number is using pipe Transform {{value | square}} </p>
成分
value = 2;
定制管
import { Pipe,PipeTransform } from '@angular/core';
@Pipe({
name:'square'
})
export class SquarePipe implements PipeTransform{
transform(value: number, args?: number[]): number {
return Math.pow(value, 2);
}
}
但是当我尝试使用这样的模板时
它不起作用我需要知道为什么?
<input type = "number" placeholder = "Enter number for which square is to be calculated" #value>
<p>Squared Number is using pipe Transform {{value | square}} </p>
我想你想要的是
<p>Squared Number is using pipe Transform {{value.value | square}} </p>
单独的value
指的是HTMLInputElement
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