< input matInput ...(角形物料形式)输入上允许3个小数点，但仅显示2个小数点 [英] <input matInput ... (Angular material form) Allow 3 decimal points on input, but only display 2 decimal points

问题描述

我有一个常规的角形材料形式，该形式使用numberMaskOptions将字段值的输入和显示限制为3个小数点. (请参见下面的代码)

这很好，但是客户现在希望将字段的显示"限制为仅显示2个小数点，但是希望允许用户在同一字段中输入3个小数点.

换句话说，当光标不在该字段中时，它应该显示2个小数点的精度，但是当用户进入该字段进行编辑时，它应该允许3个小数点的精度.

材料matInput字段可能吗?如果可以，怎么办?如果没有，我该如何处理?

     <div *ngIf="isFieldVisible">
      <mat-form-field myAppTooltip>
        <mat-label>Insect Body Size</mat-label>
        <input
          autocomplete="off"
          appNumberMask
          formControlName="InsectBodySizeSmm"
          matInput
          max="99999"
          min="0"
          [numberMaskOptions]="threeDecPrecisionDecimalMaskOptions"
        />
        <mat-error></mat-error>
      </mat-form-field>
    </div>
 

戴上口罩

 threeDecPrecisionDecimalMaskOptions = {
      align: 'right',
      allowNegative: false,
      decimalSeparator: '.',
      precision: 3,
      prefix: '',
      suffix: '',
      thousandsSeparator: '',
      valueMode: 'standard',
    };
 

这使我可以在字段形式中输入和查看3个小数点的值.

解决方案

前段时间，我做出了一个atribute指令来进行类似的修改，您可以在

In other words, when the cursor is not in the field, it should display 2 decimal points of accuracy, but when the user enters the field to edit it, it should allow 3 decimal points of accuracy.

Is this possible with material matInput fields? If so how? If not, how else should I approach this?

    <div *ngIf="isFieldVisible">
      <mat-form-field myAppTooltip>
        <mat-label>Insect Body Size</mat-label>
        <input
          autocomplete="off"
          appNumberMask
          formControlName="InsectBodySizeSmm"
          matInput
          max="99999"
          min="0"
          [numberMaskOptions]="threeDecPrecisionDecimalMaskOptions"
        />
        <mat-error></mat-error>
      </mat-form-field>
    </div>

with my mask being

threeDecPrecisionDecimalMaskOptions = {
      align: 'right',
      allowNegative: false,
      decimalSeparator: '.',
      precision: 3,
      prefix: '',
      suffix: '',
      thousandsSeparator: '',
      valueMode: 'standard',
    };

That allows me to input and view values in the field form to 3 decimal points.

解决方案

Some time ago I make a atribute directive to make some similar, you can see in this link, I don't know if you can use because you has also a directive to mask the number.

The code is as is:

@Directive({ selector: "[decimal2]" })
export class Decimal2 implements OnInit {
  private el: HTMLInputElement;
  private value: any;
  constructor(private elementRef: ElementRef) {
    this.el = this.elementRef.nativeElement;
  }
  @HostListener("focus", ["$event.target.value"])
  onFocus() {
    this.el.value = this.value;
  }

  @HostListener("blur", ["$event.target.value"])
  onBlur(value: any) {
    this.transform(value);
  }
  ngOnInit() {
    this.transform(this.el.value);
  }
  transform(value: any) {
    this.value = value;
    if (value && !isNaN(value)) {
      const aux = "" + Math.round(+this.value * 100);
      this.el.value = aux.slice(0, -2) + "." + aux.slice(-2);
      if (this.el.value.indexOf(this.value) >= 0) this.value = this.el.value;
    }
  }
}

Updated we can inprove our directive using the angular formatNumber in the transform function

  transform(value: any) {
    this.value = value;
    if (value && !isNaN(value)) {
      this.el.value=formatNumber(+this.value, "en-US", '1.2-2');
      const formated=this.el.value.split(',').join('')
      if (formated.indexOf(this.value) >= 0) this.value = formated;
    }
  }

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