Lazy loading for DataTable

src/components/datatable/DataTable.vue

@@ -1,6 +1,12 @@
 <template>
     <div class="p-datatable p-component">
         <slot></slot>
+        <div class="p-datatable-loading" v-if="loading">
+            <div class="p-datatable-loading-overlay p-component-overlay"></div>
+            <div class="p-datatable-loading-content">
+                <i :class="loadingIconClass"></i>
+            </div>
+        </div>
         <div class="p-datatable-wrapper">
             <div class="p-datatable-header" v-if="$scopedSlots.header">
                 <slot name="header"></slot>
@@ -501,6 +507,9 @@ export default {
         },
         hasGlobalFilter() {
             return this.filters && this.filters.hasOwnProperty('global');
+        },
+        loadingIconClass() {
+            return ['p-datatable-loading-icon pi-spin', this.loadingIcon];
         }
     },
     components: {
@@ -692,7 +701,7 @@ export default {
 }
 
 /* Loader */
-.p-datatable-loading-overlay {
+.p-datatable .p-datatable-loading-overlay {
     position: absolute;
     width: 100%;
     height: 100%;
@@ -701,7 +710,7 @@ export default {
     z-index: 1;
 }
 
-.p-datatable-loading-content {
+.p-datatable .p-datatable-loading-content {
     position: absolute;
     left: 50%;
     top: 50%;

src/router.js

@@ -130,6 +130,11 @@ export default new Router({
 			path: '/datatable/filter',
 			name: 'datatablefilter',
 			component: () => import('./views/datatable/DataTableFilterDemo.vue')
+        },
+        {
+			path: '/datatable/lazy',
+			name: 'datatablelazy',
+			component: () => import('./views/datatable/DataTableLazyDemo.vue')
 		},
 		{
 			path: '/dataview',

src/views/datatable/DataTableLazyDemo.vue

@@ -0,0 +1,73 @@
+<template>
+	<div>
+        <DataTableSubMenu />
+
+		<div class="content-section introduction">
+			<div class="feature-intro">
+				<h1>DataTable - Lazy</h1>
+				<p>Lazy mode is handy to deal with large datasets, instead of loading the entire data, small chunks of data is loaded by invoking corresponding callbacks everytime paging, sorting and filtering happens.
+                    Sample belows imitates lazy paging by using an in memory list. It is also important to assign the logical number of rows to totalRecords by doing a projection query for paginator configuration so that paginator displays the UI assuming there are actually records of totalRecords size although in reality they aren't as in lazy mode, only the records that are displayed on the current page exist.
+                </p>
+			</div>
+		</div>
+
+		<div class="content-section implementation">
+			<DataTable :value="cars" :lazy="true" paginator="true" :rows="10" 
+                :totalRecords="totalRecords" :loading="loading" @page="onPage($event)">
+                <Column field="vin" header="Vin"></Column>
+                <Column field="year" header="Year"></Column>
+                <Column field="brand" header="Brand"></Column>
+                <Column field="color" header="Color"></Column>
+            </DataTable>
+		</div>
+	</div>
+</template>
+
+<script>
+import CarService from '../../service/CarService';
+import DataTableSubMenu from './DataTableSubMenu';
+
+export default {
+    data() {
+        return {
+            loading: false,
+            totalRecords: 0,
+            cars: null
+        }
+    },
+    datasource: null,
+    carService: null,
+    created() {
+        this.carService = new CarService();
+    },
+    mounted() {
+        this.loading = true;
+
+        setTimeout(() => {
+            this.carService.getCarsLarge().then(data => {
+                this.datasource = data;
+                this.totalRecords = data.length,
+                this.cars = this.datasource.slice(0, 10);
+                this.loading = false;
+            });
+        }, 1000);
+    },
+    methods: {
+        
+
+        onPage(event) {
+            this.loading = true;
+
+            setTimeout(() => {
+                this.carService.getCarsLarge().then(data => {
+                    this.cars = this.datasource.slice(event.first, event.first + event.rows);
+                    this.loading = false;
+                });
+            }, 1000);
+        }
+    },
+    components: {
+        'DataTableSubMenu': DataTableSubMenu
+    }
+}
+</script>