Angular 为什么可以';t我将字符串传递给@input
我已经为我的应用开发了一个触摸友好的微调器,但是当我将名称传递给微调器子组件时,它总是空的或未定义的。我需要做什么才能让微调器子组件识别传入的字符串 下面是对子组件的html调用:Angular 为什么可以';t我将字符串传递给@input,angular,typescript,Angular,Typescript,我已经为我的应用开发了一个触摸友好的微调器,但是当我将名称传递给微调器子组件时,它总是空的或未定义的。我需要做什么才能让微调器子组件识别传入的字符串 下面是对子组件的html调用: onChanged(sr: SpinnerReturn) { if (sr.spinName === "macroCarbs") { (<FormControl>this.macroForm.controls['macroCarbs']).setValue(sr.spinValue);
onChanged(sr: SpinnerReturn) {
if (sr.spinName === "macroCarbs") {
(<FormControl>this.macroForm.controls['macroCarbs']).setValue(sr.spinValue);
} else if(sr.spinName === "macroProtein") {
(<FormControl>this.macroForm.controls['macroProtein']).setValue(sr.spinValue);
} else if(sr.spinName === "calorieDifference") {
(<FormControl>this.macroForm.controls['calorieDifference']).setValue(sr.spingValue);
}
import { Component, OnInit, Input, Output, EventEmitter} from '@angular/core';
import { SpinnerReturn } from '../../interfaces/spinnerReturn';
@Component({
selector: 'kg-spinner',
templateUrl: './app/shared/spinner/kgSpinner.component.html',
styleUrls: ['./app/shared/spinner/kgSpinner.component.css']
})
export class KgSpinnerComponent implements OnInit {
@Input() startValue: number;
@Input() range: number[];
@Input() increment: number;
@Input() spinName;
@Output() onChanged = new EventEmitter<SpinnerReturn>();
curValue: number;
lowerLimit: number;
upperLimit: number;
name: string;
sr: SpinnerReturn;
constructor() {
this.sr = new SpinnerReturn();
}
ngOnInit() {
this.lowerLimit = this.range[0];
this.upperLimit = this.range[1];
this.curValue = this.startValue;
}
onIncrement() {
this.curValue = this.curValue + this.increment;
this.returnEvent();
}
onDecrement() {
this.curValue = this.curValue - this.increment;
this.returnEvent();
}
returnEvent() {
this.sr.spinValue = this.curValue;
this.sr.spinName = this.spinName;
this.onChanged.emit(this.sr)
}
}
在父组件中:
onChanged(sr: SpinnerReturn) {
if (sr.spinName === "macroCarbs") {
(<FormControl>this.macroForm.controls['macroCarbs']).setValue(sr.spinValue);
} else if(sr.spinName === "macroProtein") {
(<FormControl>this.macroForm.controls['macroProtein']).setValue(sr.spinValue);
} else if(sr.spinName === "calorieDifference") {
(<FormControl>this.macroForm.controls['calorieDifference']).setValue(sr.spingValue);
}
import { Component, OnInit, Input, Output, EventEmitter} from '@angular/core';
import { SpinnerReturn } from '../../interfaces/spinnerReturn';
@Component({
selector: 'kg-spinner',
templateUrl: './app/shared/spinner/kgSpinner.component.html',
styleUrls: ['./app/shared/spinner/kgSpinner.component.css']
})
export class KgSpinnerComponent implements OnInit {
@Input() startValue: number;
@Input() range: number[];
@Input() increment: number;
@Input() spinName;
@Output() onChanged = new EventEmitter<SpinnerReturn>();
curValue: number;
lowerLimit: number;
upperLimit: number;
name: string;
sr: SpinnerReturn;
constructor() {
this.sr = new SpinnerReturn();
}
ngOnInit() {
this.lowerLimit = this.range[0];
this.upperLimit = this.range[1];
this.curValue = this.startValue;
}
onIncrement() {
this.curValue = this.curValue + this.increment;
this.returnEvent();
}
onDecrement() {
this.curValue = this.curValue - this.increment;
this.returnEvent();
}
returnEvent() {
this.sr.spinValue = this.curValue;
this.sr.spinName = this.spinName;
this.onChanged.emit(this.sr)
}
}
onChanged(sr:喷丝头返回){
如果(sr.spinName==“宏碳水化合物”){
(this.macroForm.controls['macroCarbs']).setValue(sr.spinValue);
}else if(sr.spinName==“宏蛋白”){
(this.macroForm.controls['macroProtein']).setValue(sr.spinValue);
}else if(sr.spinName==“热量差异”){
(此.macroForm.controls['carriodifference']).setValue(sr.spingValue);
}
子组件:
onChanged(sr: SpinnerReturn) {
if (sr.spinName === "macroCarbs") {
(<FormControl>this.macroForm.controls['macroCarbs']).setValue(sr.spinValue);
} else if(sr.spinName === "macroProtein") {
(<FormControl>this.macroForm.controls['macroProtein']).setValue(sr.spinValue);
} else if(sr.spinName === "calorieDifference") {
(<FormControl>this.macroForm.controls['calorieDifference']).setValue(sr.spingValue);
}
import { Component, OnInit, Input, Output, EventEmitter} from '@angular/core';
import { SpinnerReturn } from '../../interfaces/spinnerReturn';
@Component({
selector: 'kg-spinner',
templateUrl: './app/shared/spinner/kgSpinner.component.html',
styleUrls: ['./app/shared/spinner/kgSpinner.component.css']
})
export class KgSpinnerComponent implements OnInit {
@Input() startValue: number;
@Input() range: number[];
@Input() increment: number;
@Input() spinName;
@Output() onChanged = new EventEmitter<SpinnerReturn>();
curValue: number;
lowerLimit: number;
upperLimit: number;
name: string;
sr: SpinnerReturn;
constructor() {
this.sr = new SpinnerReturn();
}
ngOnInit() {
this.lowerLimit = this.range[0];
this.upperLimit = this.range[1];
this.curValue = this.startValue;
}
onIncrement() {
this.curValue = this.curValue + this.increment;
this.returnEvent();
}
onDecrement() {
this.curValue = this.curValue - this.increment;
this.returnEvent();
}
returnEvent() {
this.sr.spinValue = this.curValue;
this.sr.spinName = this.spinName;
this.onChanged.emit(this.sr)
}
}
从'@angular/core'导入{Component,OnInit,Input,Output,EventEmitter};
从“../../interfaces/SpinnerReturn”导入{SpinnerReturn};
@组成部分({
选择器:“kg微调器”,
templateUrl:'./app/shared/spinner/kgSpinner.component.html',
样式URL:['./app/shared/spinner/kgSpinner.component.css']
})
导出类KgSpinnerComponent实现OnInit{
@Input()起始值:数字;
@输入()范围:数字[];
@Input()增量:数字;
@输入()spinName;
@Output()onChanged=neweventemitter();
曲线值:数字;
lowerLimit:数字;
上限:数字;
名称:字符串;
sr:喷丝头返回;
构造函数(){
this.sr=新喷丝头返回();
}
恩戈尼尼特(){
this.lowerLimit=this.range[0];
this.upperLimit=this.range[1];
this.curve值=this.startValue;
}
onIncrement(){
this.curValue=this.curValue+this.increment;
this.returnEvent();
}
onDecrement(){
this.curValue=this.curValue-this.increment;
this.returnEvent();
}
returnEvent(){
this.sr.spinValue=this.curveValue;
this.sr.spinName=this.spinName;
this.onChanged.emit(this.sr)
}
}
只需从[spinName]=“macroCarbs”
中删除[]
:
这就是你得到的:
<kg-spinner spinName="macroCarbs" ...></kg-spinner>
尝试通过:
[spinName]="'macroCarbs'"
而不是
[spinName]="macroCarbs"
在html调用中,您会遇到错误,因为当您尝试像这样传递值:
[spinName]=“macroCarbs”
,它会在组件中搜索名为macroCarbs
的变量。如果您传递值时没有[]
,则如下:spinName=“macroCarbs”
,然后它就会工作。另外,当您将值传递给数字输入时,请不要使用“
”问题出在哪里?