对象中未定义的值
对象中未定义的值
提问于 2019-03-20 03:11:23
我想用来自服务器的数据填充一个页面，并能够更改信息，为此，我使用formbuilder将来自服务器的数据作为默认值，使用以下代码：
createForm(){
this.getGeral()
this.getTiposTarefas()
this.formulario = this.fb.group({
'tipo_tarefa':[this.tarefa.tipoTarefa.id, Validators.compose([Validators.required])], // Cant set default values cuz the array is object is undefined
'data_tarefa': [this.tarefa.data_tarefa, Validators.compose([Validators.required])],// Cant set default values cuz the array is object is undefined
'inicio_tarefa': [this.tarefa.inicio, Validators.compose([Validators.required])],// Cant set default values cuz the array is object is undefined
'fim_tarefa': [this.tarefa.fim, Validators.compose([Validators.required])]// Cant set default values cuz the array is object is undefined
});
}但我觉得它是不确定的。我在de subscribe函数内部尝试了console.log()，对象'Tarefa‘被填充了，但在函数作用域之外却没有。
import { Component, OnInit } from '@angular/core';
import { NavParams, ModalController } from '@ionic/angular';
import { TarefadetalheService } from './tarefadetalhe.service';
import { Tarefa } from '../../models/tarefa.model';
import { TipoTarefa } from '../../models/tipotarefa.model';
import { FormGroup, FormBuilder, Validators } from '@angular/forms';
@Component({
selector: 'app-tarefas-detalhe',
templateUrl: './tarefas-detalhe.page.html',
styleUrls: ['./tarefas-detalhe.page.scss'],
})
export class TarefasDetalhePage implements OnInit {
idTarefa = null
tarefa: Tarefa
tiposTarefas : TipoTarefa[]
formulario: FormGroup
constructor(
private navParams: NavParams,
private getTarefaDetalhe: TarefadetalheService,
private modalController:ModalController,
public fb: FormBuilder) { }
ngOnInit() {
this.createForm()
}
getGeral(){
this.idTarefa = this.navParams.get('id_tarefa');
this.getTarefaDetalhe.recuperaDetalhes().subscribe((data: Tarefa)=>{ //passar o id da tarefa como parametro no recupera detalhes
this.tarefa = data
})
}
getTiposTarefas(){
this.getTarefaDetalhe.recuperaTiposTarefas().subscribe((data: TipoTarefa[])=>{
this.tiposTarefas = data
console.log(this.tiposTarefas) // here it has information
})
console.log(this.tiposTarefas) // here it has not information
}
createForm(){
this.getGeral()
this.getTiposTarefas()
this.formulario = this.fb.group({
'tipo_tarefa':[this.tarefa.tipoTarefa.id, Validators.compose([Validators.required])], // Cant set default values cuz the array is object is undefined
'data_tarefa': [this.tarefa.data_tarefa, Validators.compose([Validators.required])],// Cant set default values cuz the array is object is undefined
'inicio_tarefa': [this.tarefa.inicio, Validators.compose([Validators.required])],// Cant set default values cuz the array is object is undefined
'fim_tarefa': [this.tarefa.fim, Validators.compose([Validators.required])]// Cant set default values cuz the array is object is undefined
});
}
closeModal()
{
this.modalController.dismiss();
}
}当我运行Ionic serve时，它抛出了下面的错误，并且我无法在Ionic控件上设置默认值：
我的HTML：
<ion-content padding *ngIf="tarefa != null">
<form [formGroup]="formulario">
<h4>
<ion-icon name="list-box"></ion-icon> Geral
</h4>
<ion-grid>
<ion-row>
<ion-col size="8">
<ion-label position="floating">Tipo de Tarefa</ion-label>
<ion-select [formControlName]="tipo_tarefa" okText="Confirmar" cancelText="Cancelar">
<ion-select-option *ngFor="let tipo of tiposTarefas" [value]="tipo.id">{{tipo.descricao}}</ion-select-option>
</ion-select>
</ion-col>
</ion-row>
</ion-grid>
<h4>
<ion-icon name="calendar"></ion-icon> Horário
</h4>
<ion-item-divider></ion-item-divider>
<ion-grid>
<ion-row>
<ion-col size="5">
<ion-label position="stacked">Data</ion-label>
<ion-datetime [formControlName]="data_tarefa" display-format="DD-MM-YYYY" max="2050-10-31" picker-format="DD-MM-YYYY"></ion-datetime>
</ion-col>
<ion-col size="3">
<ion-label position="stacked">Inicio</ion-label>
<ion-datetime [formControlName]="inicio_tarefa" display-format="HH:mm" picker-format="HH:mm" ></ion-datetime>
</ion-col>
<ion-col size="3">
<ion-label position="stacked">Fim</ion-label>
<ion-datetime [formControlName]="fim_tarefa" display-format="HH:mm" picker-format="HH:mm"></ion-datetime>
</ion-col>
</ion-row>
</ion-grid>
<h4>
<ion-icon name="person"></ion-icon> Cliente
</h4>
<ion-item-divider></ion-item-divider>
<ion-grid>
<ion-row>
</ion-row>
</ion-grid>
</form>
</ion-content>回答 1
Stack Overflow用户
发布于 2019-03-20 03:26:59
删除函数getTiposTarefas()，然后进行以下更改。
createForm(){
this.getGeral();
this.getTarefaDetalhe.recuperaTiposTarefas().subscribe((data: TipoTarefa[])=>{
this.tiposTarefas = data;
this.formulario = this.fb.group({...put the fields...});
console.log(this.tiposTarefas) // here it has information
})
}更新：您需要先初始化此tarefa: Tarefa对象。见下文
tarefa: Tarefa = {
comentarios: '',
data_tarefa: '',
descricao: '',
fim: '',
id_aprovador: '',
id_cliente: '',
id_criador: '',
id_sala: '',
id_sistema: '',
id_solicitante: '',
inicio: '',
nome_aprovador: '',
nome_cliente: '',
nome_criador: '',
nome_sistema: '',
nome_solicitante: '',
numero: 0,
participante: [],
status_tarefa: 0,
tarefa: '',
tipoTarefa: {
id:'',
interna: null,
descricao: ''
}
};那么它应该工作得很好。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/55248445
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