rxjs

临时存储

由 别等时光非礼了梦想. 提交于 2019-12-30 13:46:38
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 1、技术选型：angular + npm +typescript。适用于大型的项目并且向外部提供我们的组件 整体架构设计： 在angular的架构下面通过组件化的方式来构造界面，并且利用观察者等模式来实现数据之间的通信。通过面向对象的思想来实现组件的封装。 通过promise和rxjs来解决代码中的异步 通过npm的方式引用第三库package.json来控制版本 2、父模块是一个逻辑上的概念，用来组织各个模块和统一处理数据的地方 每一个子组件都够进行不同的组合，组织成一个大的业务组件 3、 https://github.com/querycap/reactorx 来源： oschina 链接： https://my.oschina.net/u/2285087/blog/3150809

RxJS: MergeMap with Preserving Input order

由 二次信任 提交于 2019-12-30 11:21:51
问题 Requirement: urls = [url1, url2, url3] Fire all 3 urls parallely and paint the Dom in the sequnce of the urls list ex: Finished order of urls = [url3, url1, url2] when url1 finishes Immediately render the DOM, without waiting for url2 If url2, url3 finishes before url1, then store url2, url3 and paint the DOM after url1 arrives Paint the DOM with order [url1, url2, url3] My Work using promises: // Fired all 3 urls at the same time p1 = fetch(url1) p2 = fetch(url2) p3 = fetch(url3) p1.then

RxJS wait until promise resolved

由 血红的双手。 提交于 2019-12-30 10:35:15
问题 I'm still figuring out reactive programming so I'm pretty sure this is very basic, but the number of stream transformations is pretty overwhelming to a beginner. I'm creating an Observable from a DOM event. This event should in turn trigger a REST call and all other DOM events will be ignored until this event has been resolved. const stream = Observable.fromEvent(document, 'some-event') stream .flatMap(() => httpRestService()) .subscribe(() => { }) How do I ignore the events from the stream

RxJS wait until promise resolved

由 一曲冷凌霜 提交于 2019-12-30 10:35:13
问题 I'm still figuring out reactive programming so I'm pretty sure this is very basic, but the number of stream transformations is pretty overwhelming to a beginner. I'm creating an Observable from a DOM event. This event should in turn trigger a REST call and all other DOM events will be ignored until this event has been resolved. const stream = Observable.fromEvent(document, 'some-event') stream .flatMap(() => httpRestService()) .subscribe(() => { }) How do I ignore the events from the stream

Firestore + AngularFire2 pagination ( query items by range - .startAfter(lastVisible) )

由 倾然丶 夕夏残阳落幕 提交于 2019-12-30 07:12:17
问题 In a component I want to pull a range of items from FireStore, for ex. from 0 to 5, from 5 to 10 etc. I found this in FireStore's docs, but they dont use AngularFire2 so as harder I tried to refactor as bigger mess I got. I made it working by simply splice() 'ing: service -> topFirstScores(): AngularFirestoreCollection<Score> { return this.fireRef.collection('scores', r => r .orderBy('score', 'desc').limit(6) ); } component -> $scores = new Subject(); this.scores$ = this.$scores.asObservable(

Angular2 HTTP using observables subscribe showing data undefined

由 喜夏-厌秋 提交于 2019-12-30 06:53:42
问题 I don't know what I'm doing wrong but somehow i'm not able to read data, though the data is coming from server in response and even the data is getting showed inside service extractData method when I'm putting the console but in component inside subscribe function it is giving me undefined. Help me what I'm doing wrong, what I'm assuming is that this is the problem of async but, I have no idea how correct it. Any help will be appreciable. Thanx in advance Component.ts import { Component,

How to identify which item in FormArray emitted valueChanges event?

由 别说谁变了你拦得住时间么 提交于 2019-12-30 06:46:26
问题 In Angular , is there a way to identify which FormGroup / FormControl in a dynamic FormArray emitted the valueChanges event? My FormArray is dynamic. It starts out empty and users could add a FormGroup to the FormArray by clicking a button. When valueChanges, I need to re-validate the control. Since I dont know which control emitted the event, I loop through the entire FormArray and validate all FormGroup / FormControl even though only one control changed - and this is every time when

How to identify which item in FormArray emitted valueChanges event?

由 对着背影说爱祢 提交于 2019-12-30 06:46:01
问题 In Angular , is there a way to identify which FormGroup / FormControl in a dynamic FormArray emitted the valueChanges event? My FormArray is dynamic. It starts out empty and users could add a FormGroup to the FormArray by clicking a button. When valueChanges, I need to re-validate the control. Since I dont know which control emitted the event, I loop through the entire FormArray and validate all FormGroup / FormControl even though only one control changed - and this is every time when

How to bundle Angular2 RC1 with systemjs

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-30 05:56:33
问题 Prior to the release candidates angular supplied a bundled file. Since the release candidates there's no more bundled file. Including angular2 and rxjs my app now makes 671 requests over 7secs to load. This has crippled development. Does anyone know how to bundle angular and rxjs and include these in system.config? 回答1: In order to get a lighter weight project you should check SystemJS Builder or JSPM to bundle your project. Example seed project: https://github.com/madhukard/angular2-jspm

rxjs核心概念之Observable

由 为君一笑 提交于 2019-12-30 04:54:18
RxJS简介 RxJS 是基于观察者模式和迭代器模式以函数式编程思维来实现的。简单来讲RxJS的运行就是基于Observable和Observer之间的数据生产和消费的互动过程。因此，理解RxJs，首先要对Observable和Observer有深入的理解。顾名思义，Observable就是 可被观察者 ，Observer就是 观察者 ，两者通过Observable上的sunscribe方法作为桥梁将两者联系起来。 RxJS的数据流就是Observable对象，其实现了观察者模式（Observer Pattern）和迭代器模式（Iterator Pattern）这两种设计模式。 观察者模式 Observer Pattern 定义 观察者模式是软件设计模式的一种。在此种模式中，一个目标对象管理所有相依于它的观察者对象，并且在它本身的状态改变时主动发出通知。这通常透过呼叫各观察者所提供的方法来实现。此种模式通常被用来实时事件处理系统。----维基百科 当对象之间存在一对多的关系，就可以使用观察者模式，比如当一个对象更新时通知并更新到给多个对象。其中发布通知的是发布者，接收通知执行更新的是观察者。观察者模式属于行为模式。在RxJS中，Observable就是发布者，Observer几件事观察者，二者通过订阅subscribe进行关联。 source$就是一个Observable对象
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