angular-pipe

@Pipe({name:'myPipe', pure: false}) I am unable to understand impure pipes, some what better with pure pipes. Please explain me with a simple and basic example? Günter Zöchbauer A pure pipe is only called when Angular detects a change in the value or the parameters passed to a pipe. An impure pipe is called for every change detection cycle no matter whether the value or parameters changes. This is relevant for changes that are not detected by Angular when you pass an array or object that got the content changed (but is still the same instance) when the pipe injects a service to get access to

I am trying to use a custom pipe to filter my *ngFor loop using an input field with ngModel. With my other custom pipe (sortBy), it works perfectly fine. However, the filter pipe seems to make it that none of the data appears. I'm still learning this, and I tried a few variations to no avail: -filter: term -filter: {{term}} -filter: 'term' -filter" {{'term'}} So I think the problem may lie elsewhere in the code. If anyone can help I'd really appreciate it. Here is my code: HTML Component <div style="text-align:center"> <h1> Welcome to {{title}}!! </h1> </div> <h2>Please choose your favorite

When I use my custom pipe in a template, it is like this: {{user|userName}} And it works well. Is it possible to use a pipe in the code? I try to use it like this: let name = `${user|userName}`; But it shows userName is not defined My alternative way is using db.collection.findOne() manually in the code. But is there any smart way? This is the way you can use @Pipe in a component: import { YourPipeComponentName } from '@angular/...'; class YourService { constructor(private pipe: YourPipeComponentName) {} YourFunction(value) { this.pipe.transform(value, 'pipeFilter'); } } Hongbo Miao @Siva is

So I am trying to build a custom pipe to do a search filter of multiple values in a ngFor loop. I have looked for a number of hours for a good working example, and most of them are based on previous builds and don't seem to work. So I was building the Pipe and using the console to give me the values. However, I cannot seem to get the input text to show up. Here are the previous places I have looked to find working examples: Angular 4 Pipe Filter http://jilles.me/ng-filter-in-angular2-pipes/ https://mytechnetknowhows.wordpress.com/2017/02/18/angular-2-pipes-passing-multiple-filters-to-pipes/