如何限制用户输入大于order.leftToFulfill的值?
<input class="table-input" type="number" name="check" [(ngModel)]="tempFulfill" matInput min="1" max="{{order.leftToFulfill}}" oninput="this.value = Math.abs(this.value)">
我要做的是: 例如 如果order.leftToFulfill = 50 而不是我必须限制用户输入的值大于50。
答案 0 :(得分:0)
检查以下Stackblitz Demo
HTML:
var array1 = ['a'];
var array2 = ['d', 'e', 'f'];
array1.forEach(function(element1) {
array2.forEach(function(element2) {
setTimeout(function(){
console.log(element2);
}, 1000)
});
});
console.log("Hello");
app.component.ts:
<input type="text" [maxLength]="maxLength" [ngModel]="value" (ngModelChange)='up($event)'/>
说明:
import { Component, Injectable } from '@angular/core';
@Injectable()
export class MyService {
MAXLENGTH = 2;
getMaxLength() {
return this.MAXLENGTH;
}
}
@Component({
selector: 'my-app',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
name = 'Angular 4';
maxLength: number;
value = 0;
constructor(private myService: MyService) {
this.maxLength = myService.getMaxLength();
}
up(newValue) {
console.log(newValue);
if (newValue < 0) {
this.value = 0;
} else if (newValue > 50) {
this.value = 50;
} else {
this.value = newValue;
}
}
}
用于将输入长度限制为MAXLENGTH = 2;
getMaxLength() {
return this.MAXLENGTH;
}
,例如x = 2。
极限值的核心:
x
检查值是小于0还是大于50,如果未将其设置为最小值/最大值。