ngbTypeahead 不适用于 Angular 6 和 ng-bootstrap答案

【问题标题】：ngbTypeahead not working with Angular 6 and ng-bootstrapngbTypeahead 不适用于 Angular 6 和 ng-bootstrap
【发布时间】：2019-03-21 06:42:09
【问题描述】：

我正在尝试在基本的 Angular 6 应用程序上使用 ngbTypeahead。应用程序中没有很多其他依赖项。我不断收到以下方法签名未找到错误...

ERROR TypeError: Object(...)(...) is not a function
at Observable.push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.pipe (Observable.js:91)

如果我遵循这一行，它会以这段代码结束，这是它正在寻找的方法。

return pipeFromArray(operations)(this);

这里是导入

import { Component, OnInit } from '@angular/core';
import {Observable} from 'rxjs';
import {debounceTime, map} from 'rxjs/operators';

这是我的 package.json

{
  "name": "myapp",
  "version": "1.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve --proxy-config proxy.conf.json",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^6.1.0",
    "@angular/common": "^6.1.0",
    "@angular/compiler": "^6.1.0",
    "@angular/core": "^6.1.0",
    "@angular/forms": "^6.1.0",
    "@angular/http": "^6.1.0",
    "@angular/platform-browser": "^6.1.0",
    "@angular/platform-browser-dynamic": "^6.1.0",
    "@angular/router": "^6.1.0",
    "@ng-bootstrap/ng-bootstrap": "^3.0",
    "core-js": "^2.5.4",
    "rxjs": "^6.1.0",
    "rxjs-compat": "^6.1.0",
    "zone.js": "~0.8.26"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.7.0",
    "@angular/cli": "~6.1.2",
    "@angular/compiler-cli": "^6.1.0",
    "@angular/language-service": "^6.1.0",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "~4.2.1",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~1.7.1",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.0",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.3.0",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1",
    "typescript": "~2.7.2"
  }
}

【问题讨论】：

确保，如果你是链式/单一操作符，你已经添加了管道操作符。
请提供更多信息？您可能没有正确导入角度引导模块。

标签： angular ng-bootstrap rxjs6

【解决方案1】：

我遇到了同样的问题，只是因为过滤器代码错误。确保在 [ngbTypeahead] 上调用的过滤器方法确实返回了一个 Observable。在我的情况下，我替换了代码并且没有返回任何导致未定义问题的内容。

例子：

search = (text$: Observable<string>) =>
    text$
      .debounceTime(200)
      .distinctUntilChanged()
      .map(term => term.length < 2 ? []
        : states.filter(v => new RegExp(term, 'gi').test(v)).splice(0, 10));`

There is a plunker with working code here:

【讨论】：