<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
    <title>DevExtreme Demo</title>
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
    <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/17.2.6/css/dx.spa.css" />
    <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/17.2.6/css/dx.common.css" />
    <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/17.2.6/css/dx.light.css" />

    <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
    <script src="https://unpkg.com/zone.js@0.6.25/dist/zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>

    <script src="config.js"></script>
    <script>
        System.import('app')
            .then(function(viz) {
                System.import("devextreme/viz/themes").then(function(viz) {
                    viz.currentTheme("generic.light");
                    viz.refreshTheme();
                });
            })
            .catch(console.error.bind(console));
    </script>

</head>

<body class="dx-viewport">
    <div class="demo-container">
        <demo-app>Loading...</demo-app>
    </div>
</body>

</html>
// In real applications, you should not transpile code in the browser. You can see how to create your own application with Angular and DevExtreme here:
// https://github.com/DevExpress/devextreme-angular/blob/master/README.md

System.config({
    transpiler: 'ts',
    typescriptOptions: {
        module: "commonjs",
        emitDecoratorMetadata: true,
        experimentalDecorators: true
    },
    meta: {
        'typescript': {
            "exports": "ts"
        }
    },
    paths: {
        'npm:': 'https://unpkg.com/'
    },
    map: {
        'ts': 'npm:plugin-typescript@7.0.6/lib/plugin.js',
        'typescript': 'npm:typescript@2.2.2/lib/typescript.js',

        '@angular/core': 'npm:@angular/core@5.1.2/bundles/core.umd.js',
        '@angular/common': 'npm:@angular/common@5.1.2/bundles/common.umd.js',
        '@angular/compiler': 'npm:@angular/compiler@5.1.2/bundles/compiler.umd.js',
        '@angular/platform-browser': 'npm:@angular/platform-browser@5.1.2/bundles/platform-browser.umd.js',
        '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@5.1.2/bundles/platform-browser-dynamic.umd.js',
        '@angular/http': 'npm:@angular/http@5.1.2/bundles/http.umd.js',
        '@angular/router': 'npm:@angular/router@5.1.2/bundles/router.umd.js',
        '@angular/forms': 'npm:@angular/forms@5.1.2/bundles/forms.umd.js',

        'rxjs': 'npm:rxjs@5.3.1',

        'devextreme': 'npm:devextreme@17.2',
        'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js',
        'devextreme-angular': 'npm:devextreme-angular@17.2'
    },
    packages: {
        'app': {
            main: './app.component.ts',
            defaultExtension: 'ts'
        },
        'devextreme': {
            defaultExtension: 'js'
        },
        'devextreme-angular': {
            main: 'index.js',
            defaultExtension: 'js'
        }
    }
});
<dx-data-grid 
    id="gridContainer"
    [dataSource]="dataSource"
    keyExpr="orderID"
    [allowColumnReordering]="true"
    (onRowUpdating) = "onRowUpdating($event)"
    (onRowValidating) ="onRowValidating($event)">
    
    <dxo-paging [enabled]="true"></dxo-paging>
    <dxo-editing 
         mode="row"
         [allowUpdating]="true">
    </dxo-editing>
    
    <dxi-column dataField="orderID"  [allowEditing]="false" caption="Title"></dxi-column>
    <dxi-column dataField="customerName" [allowEditing]="false"></dxi-column>
    <dxi-column dataField="actualQty" [allowEditing]="false" [calculateCellValue]="formatActualQty" [width]=140></dxi-column>
    <dxi-column dataField="userGivenQty" caption="UserGiven Qty" datatype="number" [allowEditing]="true" [allowGrouping]="false">
       <dxi-validation-rule type="numeric"></dxi-validation-rule>
   </dxi-column>
   <dxi-column dataField="inspectedQty" caption="Inspected Qty" datatype="number" [allowEditing]="true" [allowGrouping]="false">
       <dxi-validation-rule type="numeric"></dxi-validation-rule>
   </dxi-column>
    <dxi-column dataField="variationReason" [width]="130" ></dxi-column>
    <dxo-filter-row [visible]="true"></dxo-filter-row>
</dx-data-grid>

import { NgModule, Component, enableProdMode } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { DxDataGridModule, DxButtonModule } from 'devextreme-angular';
import { Service, Employee, State } from './app.service';

if(!/localhost/.test(document.location.host)) {
    enableProdMode();
}

@Component({
    selector: 'demo-app',
    templateUrl: 'app/app.component.html',
    styleUrls: ['app/app.component.css'],
    providers: [Service]
})
export class AppComponent {
    dataSource: Order[];
    constructor(service: Service) {
        this.dataSource = service.getOrders();
    }
    
    onRowValidating(e){

    let actualQty = e.oldData.actualQty;
    let userGivenQty = e.newData.userGivenQty != null? e.newData.userGivenQty : e.oldData.userGivenQty;
    let inspectedQty= e.newData.inspectedQty != null? e.newData.inspectedQty: e.oldData.inspectedQty;
    let variationReason = e.newData.variationReason != null ? e.newData.variationReason : e.oldData.variationReason;

    if(userGivenQty === "" && inspectedQty === "" && variationReason === ""){
      e.isValid = true;
      return
    }
    
    if(this.isEmpty(userGivenQty ) && this.isEmpty(inspectedQty)  && !this.isEmpty(variationReason )){
      alert('Please remove the variation reason as there are no quantities given', 'Error');
      e.isValid = false;
      return;
    }
    

    debugger;
    userGivenQty = Number(this.isEmpty(userGivenQty)? 0 : userGivenQty);
    inspectedQty = Number(this.isEmpty(inspectedQty)? 0 : inspectedQty);

    debugger;    
    
    if (Math.abs(userGivenQty- actualQty) > 0.0 || (Math.abs(inspectedQty- actualQty) > 0.0 )) {
        if (variationReason === null || variationReason === "") {
          alert("Please provide a valid reason for the variation", 'error');
          e.isValid = false;
          return;
        }
      }
    }
    
    onRowUpdating(e){
      alert("updated row");
     }
    
  isEmpty(value: any): boolean {
    return value == null || value === "" ? true : false;
  }
  
    formatActualQty(data):number{
    let qty = data.actualQty;
    if (Math.abs(qty) < 0.01) {
      return 0;
    }else{
      let value = qty;
      let precision = data.precision;
      if(precision > 0){
        value = qty.toFixed(precision);
      }
      let valueStr = value.toString();
      let p = valueStr.indexOf('.');
      //convert number to comma separated string
      return valueStr.replace(/\d(?=(?:\d{3})+(?:\.|$))/g, function ($0, i) {
        return p < 0 || i < p ? ($0 + ',') : $0;
      });
    }
  }
}

@NgModule({
    imports: [
        BrowserModule,
        DxDataGridModule,
        DxButtonModule
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }

platformBrowserDynamic().bootstrapModule(AppModule);
import { Injectable } from '@angular/core';

export class Order {
    orderID: number;
    customerName: string;
    shipCountry: string;
    shipCity: string;
    actualQty: number;
    userGivenQty: number;
    inspectedQty: number;
    variationReason: string;
    precision:number;
}


let orders: Order[] = [
{
  "orderID": 10248,   
  "customerName": "Paul Henriot",
  "shipCountry": "France",
  "shipCity": "Reims",
  "actualQty": 39.05,
  "userGivenQty": null,
  "inspectedQty":null,
  "variationReason":null,
  "precision":4
},
{
  "orderID": 10249,   
  "customerName": "Karen Base",
  "shipCountry": "Germany",
  "shipCity": "Stuggart",
  "actualQty": 56584.23,
  "userGivenQty": null,
  "inspectedQty":null,
  "variationReason":null,
  "precision":-99
},
{
  "orderID": 10250,   
  "customerName": "Maurice Glen",
  "shipCountry": "France",
  "shipCity": "Reims",
  "actualQty": 56590.05,
  "userGivenQty": null,
  "inspectedQty":null,
  "variationReason":null,
  "precision":-99
  
},
{
  "orderID": 10251,   
  "customerName": "Weni Mary",
  "shipCountry": "UK",
  "shipCity": "London",
  "actualQty": 113.15,
  "userGivenQty": null,
  "inspectedQty":null,
  "variationReason":null,
  "precision":-99
},
{
  "orderID": 10252,   
  "customerName": "Candice Nikola",
  "shipCountry": "Italy",
  "shipCity": "Rome",
  "actualQty": 343434399.75,
  "userGivenQty": null,
  "inspectedQty":null,
  "variationReason":null,
  "precision":-99
}
];



@Injectable()
export class Service {
    getOrders() {
        return orders;
    }
}
/deep/ #events {
    background-color: rgba(191, 191, 191, 0.15);
    padding: 20px;
    margin-top: 20px;
}

/deep/ #events > div {
    padding-bottom: 5px;
}

/deep/ #events > div:after {
    content: "";
    display: table;
    clear: both;
}

/deep/ #events #clear {
    float: right;
}

/deep/ #events .caption {
    float: left;
    font-weight: bold;
    font-size: 115%;
    line-height: 115%;
    padding-top: 7px;
}

/deep/ #events ul {
    list-style: none;
    max-height: 100px;
    overflow: auto;
}

/deep/ #events ul li {
    padding: 7px 0;
    border-bottom: 1px solid #dddddd;
}

/deep/ #events ul li:last-child {
    border-bottom: none;
}
var orders = [{
  "orderID": 10248,
  "pending": "Y",
  "orderDate": "1996-07-04T00:00:00",
  "customerName": "Paul Henriot",
  "shipCountry": "France",
  "shipCity": "Reims",
  "pendingRequest":"1"
}, {
  "orderID": 10249,
  "pending": "N",
  "orderDate": "1996-07-05T00:00:00",
  "customerName": "Karin Josephs",
  "shipCountry": "Germany",
  "shipCity": "Münster",
  "pendingRequest":"0"
}, {
  "orderID": 10250,
  "pending": "Y",
  "orderDate": "1996-07-08T00:00:00",
  "customerName": "Mario Pontes",
  "shipCountry": "Brazil",
  "shipCity": "Rio de Janeiro",
  "pendingRequest":"1"
}, {
  "orderID": 10251,
  "pending": "N",
  "orderDate": "1996-07-08T00:00:00",
  "customerName": "Mary Saveley",
  "shipCountry": "France",
  "shipCity": "Lyon",
  "pendingRequest":"0"
}, {
  "orderID": 10252,
  "pending": "Y",
  "orderDate": "1996-07-09T00:00:00",
  "customerName": "Pascale Cartrain",
  "shipCountry": "Belgium",
  "shipCity": "Charleroi",
  "pendingRequest":"1"
}, {
  "orderID": 10253,
  "pending": "N",
  "orderDate": "1996-07-10T00:00:00",
  "customerName": "Mario Pontes",
  "shipCountry": "Brazil",
  "shipCity": "Rio de Janeiro",
  "pendingRequest":"0"
}, {
  "orderID": 10254,
  "pending": "N",
  "orderDate": "1996-07-11T00:00:00",
  "customerName": "Yang Wang",
  "shipCountry": "Switzerland",
  "shipCity": "Bern"
}, {
  "orderID": 10255,
  "pending": "Y",
  "orderDate": "1996-07-12T00:00:00",
  "customerName": "Michael Holz",
  "shipCountry": "Germany",
  "shipCity": "Genève",
  "pendingRequest":"0"
}, {
  "orderID": 10256,
  "pending": "Y",
  "orderDate": "1996-07-15T00:00:00",
  "customerName": "Paula Parente",
  "shipCountry": "Brazil",
  "shipCity": "Resende",
    "pendingRequest":"1"
}, {
  "orderID": 10257,
  "pending": "N",
  "orderDate": "1996-07-16T00:00:00",
  "customerName": "Carlos Hernández",
  "shipCountry": "Germany",
  "shipCity": "San Cristóbal",
  "pendingRequest":"0"
}, {
  "orderID": 10258,
  "pending": "Y",
  "orderDate": "1996-07-17T00:00:00",
  "customerName": "Roland Mendel",
  "shipCountry": "Austria",
  "shipCity": "Graz",
  "pendingRequest":"0"
}, {
  "orderID": 10259,
  "pending": "Y",
  "orderDate": "1996-07-18T00:00:00",
  "customerName": "Francisco Chang",
  "shipCountry": "Mexico",
  "shipCity": "México D.F.",
  "pendingRequest":""
}, {
  "orderID": 10260,
  "pending": "Y",
  "orderDate": "1996-07-19T00:00:00",
  "customerName": "Henriette Pfalzheim",
  "shipCountry": "Germany",
  "shipCity": "Köln",
  "pendingRequest":"0"
}, {
  "orderID": 10261,
  "pending": "N",
  "orderDate": "1996-07-19T00:00:00",
  "customerName": "Bernardo Batista",
  "shipCountry": "Brazil",
  "shipCity": "Rio de Janeiro",
  "pendingRequest":"0"
} ];