max length

maxlength not work for input type number 

only number exe link

so for type text it will work but it will allow keys 

  <mat-form-field class="harsco-input" [floatLabel]="'always'">

                    <mat-label>Budgeted Approval  Amount($)</mat-label>

                    <input type="text" matInput name="BudgetedApprovalAmt" id="amount"  maxlength="3"

                      [(ngModel)]="workFlowMembers.ApprovalAmount"

                      required />

                  </mat-form-field>