add limit by

pdb-js/src/app/limit-by/limit-by.component.html

@@ -0,0 +1,22 @@
+<mat-form-field id="limitBy">
+  <mat-label>Limit By:</mat-label>
+  <mat-select [(value)]="limitBy">
+    <mat-option value="NO_LIMIT">no limit</mat-option>
+    <mat-option value="MOST_VALUES">most values</mat-option>
+    <mat-option value="FEWEST_VALUES">fewest values</mat-option>
+    <mat-option value="MAX_VALUE">max value</mat-option>
+    <mat-option value="MIN_VALUE">min value</mat-option>
+  </mat-select>
+</mat-form-field>
+
+<mat-form-field id="limit"
+  *ngIf="limitBy !== 'NO_LIMIT'">
+  <input 
+    matInput 
+    type="number" 
+    placeholder="Limit" 
+    min="1" 
+    value="{{limit}}"
+    
+    >
+</mat-form-field>

pdb-js/src/app/limit-by/limit-by.component.scss

@@ -0,0 +1,9 @@
+#limitBy {
+  width: 10em;
+  margin-right: 1ex;
+}
+
+#limit {
+  width: 5em;
+  margin-right: 0ex;
+}

pdb-js/src/app/limit-by/limit-by.component.spec.ts

@@ -0,0 +1,25 @@
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { LimitByComponent } from './limit-by.component';
+
+describe('LimitByComponent', () => {
+  let component: LimitByComponent;
+  let fixture: ComponentFixture<LimitByComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ LimitByComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(LimitByComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

pdb-js/src/app/limit-by/limit-by.component.ts

@@ -0,0 +1,18 @@
+import { Component, OnInit, Input} from '@angular/core';
+
+@Component({
+  selector: 'pdb-limit-by',
+  templateUrl: './limit-by.component.html',
+  styleUrls: ['./limit-by.component.scss']
+})
+export class LimitByComponent implements OnInit {
+
+  @Input() limit: number;
+
+  @Input() limitBy: string;
+
+  constructor() { }
+
+  ngOnInit() {
+  }
+}