angular2-services

问题 I'm trying to post form data, but I'm getting the following error on submit: TypeError: Cannot create property '_id' on string '{"[object Object]":""}'. My post was successfully captured: Movie {id: "8", firstname: "test", lastname: "test", hero: "test", photo: "xxxxxxxx"} But the data is not saved in MongoDB. I'm using the MEAN stack with Angular2. My server.js : //Need to write the Express code var express = require('express'); var path = require('path'); var bodyParser = require('body

问题 I wanted to use a value from a subscribe method in another one, but it gives me undefined because it is not async. Is there a method to use those values together? I want to use this.internships another time in the following subscribe method but it becomes undefined. Thank you for helping! Code: ngOnInit(): void { this._internshipAssignmentService.getInternshipAssignments() .subscribe(internships => { this.internships = internships; <---- value which gives an object this.internshipsHelper =

问题 I want to implement autocomplete feature , so an identical option i found was using multi-select drop-down. So i used this module - https://www.npmjs.com/package/ng-multiselect-dropdown But after ditto implementing, i get these errors - Error - ERROR Error: Uncaught (in promise): Error: Template parse errors: Can't bind to 'placeholder' since it isn't a known property of 'ng- multiselect-dropdown'. 1. If 'placeholder' is an Angular directive, then add 'CommonModule' to the '@NgModule.imports'

问题 I'm trying to do something after an Observable / subscribe completes. I'm changing an Input property in the subscribe( onNext ) method, but ngOnChanges never fires. What should I be doing differently? import { Component, EventEmitter, OnInit, AfterViewInit, OnChanges, SimpleChanges, Input, Output } from '@angular/core'; @Component({ templateUrl: 'myTemplate.html' , providers: [ NamesService ] }) export class MyPage { @Input() names: any[]; constructor( public namesSvc: NamesService) {}

问题 I want to Pass parameters to POST method in angular 2 but it is not working whwn I used params:new httpParams().set() but it is not worked .I also tried params:new httpParams().set() and headers then also it is not worked & finally I got the solution with Formdata 回答1: You can use formData to send http params or any kind of attachment. let formData = new FormData(); formData.append('key1', 'value1'); formData.append('key2', 'value2'); // http request with post method this.httpService.post(

问题 I am working on an angular2 project, I have a file in assets folder and I have created a button to download the file while running the app. I see there are quite a many solutions to the above problem so i got confused. Can you please help. <button pButton type="button" (click)="f1()" label="Download Sample Defaults XML File"></button> I need code for f1() which can help me download the file to my Download folder when clicking on above button. Help appreciated. Thanks 回答1: You can either style

问题 I've got the method in my app.component that changes languages in my LangService. When the change occurs the LangService should then response with Observable object to all my other components as I have subscribed to changes in all my components. Unfortunately, it's not happening. It only response to the app.component that called the function for changing the language. I'm not sure where I have made a mistake. Maybe I'm just misunderstanding the whole concept as I'm new to Angular. Here is the

问题 I decided to put LoginComponent, AuthService, LoggedInGuard inside a module called AuthModule: import { NgModule } from '@angular/core'; import { CommonModule } from '@angular/common'; import { AuthComponent } from './auth.component'; import { LoginComponent } from './components/login/login.component'; import { AuthService } from './services/auth/auth.service'; import { StorageService } from './services/storage/storage.service'; import { RequestService } from './services/request/request

问题 Ok it's my first day doing some Angular 2 using typescript and I am try to make a simple getter and setter service. import {Injectable} from "angular2/core"; @Injectable() export class TodoService { private _todos:Array = []; get todos():Array { return this._todos; } set todos(value:Array) { this._todos = value; } } Can anyone explain why the Typescript compiler is throwing the following error as I think it should be ok. ERROR in [default] /Users/testguy/WebstormProjects/angular2-seed/src/app

问题 I am new to Angular 2/4 and typescript.. I want to get the radio button values selected for the Phone, email and address and pass the selected values to typescript page. client.info.ts How do I go about getting the values of the radio button clicked in typescript from html page. I have included my typescript and html code below. Currently this is not working can someone help here is my code for the client-info.component.html(data pulled from JSOn file) <div class="section-container"> <!--<div