我想在输入元素中输入两个值并计算它们,但是不使用Submit按钮,而是使用change事件。 如何执行此操作?
示例html
<form>
<div class="form-group">
<label>Input 1</label>
<input type="number" class="form-control" name="input">
</div>
<div class="form-group">
<label>Input 2</label>
<input type="number" class="form-control" name="reference">
</div>
<div class="form-group">
<label>Sum</label>
<input type="text" class="form-control" name="difference">
</div>
</form>
应该是这样的,当我输入input 1 = 2
和input 2 = 3
时,会自动将这两个输入和结果相加为此sum = 5
答案 0 :(得分:0)
输入中的change
事件将调用您要执行的求和函数。
为明确起见,在(change)=“sum()“
标记中插入input
,然后在sum
中定义component.ts
函数,如下所示:
component.html
<form>
<div class="form-group">
<label>Input 1</label>
<input type="number" class="form-control" name="input1" (change)="sum()" [(ngModel)]="input1">
</div>
<div class="form-group">
<label>Input 2</label>
<input type="number" class="form-control" name="input2" (change)="sum()" [(ngModel)]="input2">
</div>
<div class="form-group">
<label>Sum</label>
<p>{{total}}</p>
</div>
</form>
component.ts
@Component({
selector: 'app-selector',
templateUrl: './name.component.html',
styleUrls: ['./name.component.css']
})
export class NameOfComponent {
total: number
input1: number = 0
input2: number = 0
sum () {
this.total = this.input1 + this.input2
}
}
答案 1 :(得分:0)
您不需要使用(change)=“ sum()”。您只需编写{{input1 + input2}}
<form>
<input type="number" class="form-control" name="input1" [(ngModel)]="input1">
<input type="number" class="form-control" name="input2" [(ngModel)]="input2">
<p>{{input1+input2}}</p>
</form>