Confirm before deleting database columns

src/app/components/editor/database/columns/columns.component.ts

@@ -1,5 +1,5 @@
 import {Component, Input, OnInit} from '@angular/core';
-import {ModalController} from '@ionic/angular';
+import {AlertController, ModalController} from '@ionic/angular';
 import {uuid_v4} from '../../../../utility';
 
 @Component({
@@ -11,7 +11,8 @@ export class ColumnsComponent implements OnInit {
   @Input() columnSets: Array<{headerName: string, field: string, Type: string, additionalData: any}> = [];
 
   constructor(
-      protected modals: ModalController
+      protected modals: ModalController,
+      protected alerts: AlertController,
   ) { }
 
   ngOnInit() {}
@@ -50,9 +51,21 @@ export class ColumnsComponent implements OnInit {
   }
 
   onDeleteClick(i) {
-    this.columnSets = this.columnSets.filter((x, index) => {
-      return index !== i;
-    });
+    this.alerts.create({
+      header: 'Delete column?',
+      message: 'Are you sure you want to delete this column? Its data will be lost.',
+      buttons: [
+        { text: 'Keep It', role: 'cancel' },
+        {
+          text: 'Delete It',
+          handler: () => {
+            this.columnSets = this.columnSets.filter((x, index) => {
+              return index !== i;
+            });
+          },
+        }
+      ],
+    }).then(alert => alert.present());
   }
 
   onUpArrow(i) {