小编Raf*_*sto的帖子

尝试在角度cli中创建库时,我收到以下错误

Schematic "library" not found in collection "@schematics/angular".
Error: Schematic "library" not found in collection
"@schematics/angular".
    at SchematicEngine.createSchematic (/home/rafaelvicio/node-v8.9.3-linux-x64/lib/node_modules/@angular/cli/node_modules/@angular-devkit/schematics/src/engine/engine.js:143:23)
    at CollectionImpl.createSchematic (/home/rafaelvicio/node-v8.9.3-linux-x64/lib/node_modules/@angular/cli/node_modules/@angular-devkit/schematics/src/engine/collection.js:12:29)
    at Object.getSchematic (/home/rafaelvicio/node-v8.9.3-linux-x64/lib/node_modules/@angular/cli/utilities/schematics.js:47:23)
    at Class.run (/home/rafaelvicio/node-v8.9.3-linux-x64/lib/node_modules/@angular/cli/tasks/schematic-get-options.js:12:40)
    at Class.beforeRun (/home/rafaelvicio/node-v8.9.3-linux-x64/lib/node_modules/@angular/cli/commands/generate.js:101:31)
    at Promise.resolve.then (/home/rafaelvicio/node-v8.9.3-linux-x64/lib/node_modules/@angular/cli/ember-cli/lib/cli/cli.js:138:24)
    at <anonymous>

命令 ng --version

显示了这个

Angular CLI: 1.7.4
Node: 8.9.3
OS: linux x64
Angular: 


node -v
v8.9.3

npm -v
5.5.1

从我的库中执行'ng build'时出现以下错误.

我目前正在使用Angular 6,但我相信这个错误与版本无关.

/home/rafaelvicio/desenv/my-lib/arquitetura-web/projects/pf-siseg/src/lib/keycloak-service/keycloak.service.ts:13:1:为导出的符号'KeycloakService'生成的元数据中遇到错误:
/home/rafaelvicio/desenv/my-lib/arquitetura-web/projects/pf-siseg/src/lib/keycloak-service/keycloak.service.ts:18 : 12:收集的元数据包含一个错误,将在运行时:只能初始化变量和常量,因为模板编译器需要此变量的值.
{"_ _ symbolic":"错误","消息":"变量未初始化","行":17,"字符":11}错误:/ home/rafaelvicio/desenv/my-lib/arquitetura-web/projects/pf-siseg/src/lib/keycloak-service/keycloak.service.ts:13:1:为导出的符号'KeycloakService'生成的元数据遇到错误:
/home/rafaelvicio/desenv/my-lib/arquitetura-web/projects /pf-siseg/src/lib/keycloak-service/keycloak.service.ts:18:12:收集的元数据包含将在运行时报告的错误:只能初始化变量和常量,因为此变量的值为模板编译器需要的.
{"_ _ symbolic":"错误","消息":"变量未初始化","行":17,"字符":11} at/home/rafaelvicio/desenv/my-lib/arquitetura-web/node_modules/@ angular/compiler-cli/src/metadata/collector.js:707:31位于validateMetadata的Array.forEach()(/ home/rafaelvicio/desenv/my-lib/arquitetura-web/node_modules/@ angular/compiler-cli/src/metadata/collector.js:695:46)在MetadataCollector.getMetadata(/home/rafaelvicio/desenv/my-lib/arquitetura-web/node_modules/@angular/compiler-cli/src/metadata/collector.js:550 :21)在Object.getSourceFileMetadata上的MetadataCache.getMetadata(/home/rafaelvicio/desenv/my-lib/arquitetura-web/node_modules/@angular/compiler-cli/src/transformers/metadata_cache.js:86:41) home.rafaelvicio/desenv/my-lib/arquitetura-web/node_modules/@angular/compiler-cli/src/transformers/compiler_host.js:112:56)at Object.readMetadata(/ home/rafaelvicio/desenv/my-lib TsompilerAotCompiler上的/arquitetura-web/node_modules/@angular/compiler-cli/src/transformers/metadata_reader.js:46:37)StaticSymbolResolver.getModuleMetadata中的TypeCheckHostAdapter.getMetadataFor(/home/rafaelvicio/desenv/my-lib/arquitetura-web/node_modules/@angular/compiler-cli/src/transformers/compiler_host.js:464:38)(/ home/rafaelvicio/desenv/my-lib/arquitetura-web/node_modules/@angular/compiler/src/aot/static_symbol_resolver.js:480:49)在StaticSymbolResolver._createSymbolsOf(/ home/rafaelvicio/desenv/my-lib/arquitetura-web/node_modules) /@angular/compiler/src/aot/static_symbol_resolver.js:268:33)

keycloak.service.ts:

import { Injectable } from '@angular/core';
import { KeycloakLoginOptions } from './keycloak.d';

import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';

import * as Keycloak from './keycloak';

export type KeycloakClient = Keycloak.KeycloakInstance;
type InitOptions = Keycloak.KeycloakInitOptions;

@Injectable()
export class KeycloakService {

    constructor(private http: HttpClient) { }

    static …

我正在使用 Phoenix 创建一个简单的 API Rest。执行命令时出现以下错误：mix ecto.migrate

22:25:14.197 [error] Postgrex.Protocol (#PID<0.193.0>) failed to connect: ** (Postgrex.Error) FATAL (invalid_catalog_name): database "api_example_dev" does not exist
** (DBConnection.ConnectionError) connection not available because of disconnection
    (db_connection) lib/db_connection.ex:934: DBConnection.checkout/2
    (db_connection) lib/db_connection.ex:750: DBConnection.run/3
    (db_connection) lib/db_connection.ex:1141: DBConnection.run_meter/3
    (db_connection) lib/db_connection.ex:592: DBConnection.prepare_execute/4
    (ecto) lib/ecto/adapters/postgres/connection.ex:91: Ecto.Adapters.Postgres.Connection.execute/4
    (ecto) lib/ecto/adapters/sql.ex:235: Ecto.Adapters.SQL.sql_call/6
    (ecto) lib/ecto/adapters/sql.ex:185: Ecto.Adapters.SQL.query!/5
    (ecto) lib/ecto/adapters/postgres.ex:71: Ecto.Adapters.Postgres.execute_ddl/3
    (ecto) lib/ecto/migrator.ex:43: Ecto.Migrator.migrated_versions/2
    (ecto) lib/ecto/migrator.ex:142: Ecto.Migrator.run/4
    (ecto) lib/mix/tasks/ecto.migrate.ex:84: anonymous fn/4 in Mix.Tasks.Ecto.Migrate.run/2
    (elixir) lib/enum.ex:737: Enum."-each/2-lists^foreach/1-0-"/2
    (elixir) lib/enum.ex:737: Enum.each/2
    (mix) lib/mix/task.ex:314: Mix.Task.run_task/3
    (mix) lib/mix/cli.ex:80: Mix.CLI.run_task/2
    (elixir) lib/code.ex:677: …

我正在尝试将一个简单的组件导入到我的 React 中。我无法找到此组件。

导入组件时出现以下错误

./src/App.js 61:28-32 './componentes/Menu' 不包含名为 'Menu' 的导出。

这是我的简单组件：

import React, { Component } from 'react';

import { Button } from 'react-bootstrap';

export default class Menu extends Component {

    render() {
        return (
            <div>
            <Button bsStyle="danger">Hello World Dangerhahahah</Button>
          </div>
        );
    }

}

我在我的应用程序中按如下方式调用它。

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';

import { Menu } from './componentes/Menu';

import { Button } from 'react-bootstrap';

class App extends Component {

  constructor(props) {
    super(props)
  }

render() …

如何从选择组件中获取选择的值？

select.component.ts：

export class PfSelectComponent implements OnInit {

  constructor() { }

  ngOnInit() {
  }

  @Input() options : Array<Object>;

}

select.component.html

<select [(ngModel)]="selectedValue" id="exampleFormControlSelect1" class="form-control">
  <option *ngFor="let option of options" [ngValue]="option.value">{{option.name}}</option>
</select>

select value: {{selectedValue}}

{{selectValue}}不显示在组件中选择的值。

我有一个使用自定义组件作为输入的表单，它接收 ControlName。当我在组件中键入内容时，它不会更新“错误”属性。

应用程序-pf-input-text.ts：

import { Component, OnInit, Input } from \'@angular/core\';\n\n@Component({\n  selector: \'app-pf-input-text\',\n  templateUrl: \'./pf-input-text.component.html\',\n  styleUrls: [\'./pf-input-text.component.scss\']\n})\nexport class PfInputTextComponent implements OnInit {\n\n  @Input() id: string;\n  @Input() name: string;\n  @Input() value: string;\n  @Input() placeholder: string;\n\n  //falta trim\n\n  @Input() maxlength: string;\n  @Input() minlength: string;\n\n  @Input() disabled: boolean;\n  @Input() required: boolean;\n\n  constructor() { }\n\n  ngOnInit() {\n  }\n}\n

app-pf-input-text.html：

<div class="input-group">\n  <input \n      type="text" class="form-control">\n</div>\n

我的表格：

import { Component, OnInit, Input } from \'@angular/core\';\n\nimport { FormArray, FormBuilder, FormGroup, …

我在创建一个简单的组件以在我的React应用程序中呈现菜单时遇到麻烦。

这是我的组件的代码：

import React, { Component } from 'react';

export default class menu extends Component {

    render() {
        return (
            <nav className="navbar navbar-expand-lg navbar-light bg-light">
                <a className="navbar-brand" href="#">Navbar</a>
                <button className="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
                    <span className="navbar-toggler-icon"></span>
                </button>
                <div className="collapse navbar-collapse" id="navbarNavDropdown">
                    <ul className="navbar-nav">
                        <li className="nav-item active">
                            <a className="nav-link" href="#">Home <span className="sr-only">(current)</span></a>
                        </li>
                        <li className="nav-item">
                            <a className="nav-link" href="#">Features</a>
                        </li>
                        <li className="nav-item">
                            <a className="nav-link" href="#">Pricing</a>
                        </li>
                        <li className="nav-item dropdown">
                            <a className="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                                Dropdown link …

我试图在我的Wildfly 11服务器上部署我的应用程序,但我遇到以下问题.

无法上传部署:{"WFLYCTL0080:Failed services"=> {"jboss.deployment.unit.\"javaee-angularjs.war \".WeldStartService"=>"无法启动服务引起:java.lang.IllegalArgumentException:WFLYWELD0037 :错误将持久性单元注入CDI托管bean.在部署javaee-angularjs.war中找不到名为'siscorp'的持久性单元,用于注入点私有javax.persistence.EntityManager br.com.rafaelvicio.siscorp.util.Persistence.entityManager "}}

这是我的持久性类:

package br.com.rafaelvicio.siscorp.util;

import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.Produces;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

@ApplicationScoped
public class Persistence {

      @PersistenceContext(unitName="siscorp")
      private EntityManager entityManager;

      @Produces
      public EntityManager getEntityManager() {
          return entityManager;
      }

}

这是我的persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1"
    xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">

    <persistence-unit name="siscorp">

        <!-- provedor/implementacao do JPA -->
        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>

        <!-- entidade mapeada -->
        <class>br.com.rafaelvicio.siscorp.model.CEP</class>

        <properties>
            <!-- dados da conexao -->
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/siscorp" />
            <property name="javax.persistence.jdbc.user" value="root" />
            <property …