From f7b2492c82e959bce47cf84affc6191f84472fbc Mon Sep 17 00:00:00 2001
From: cagataycivici <cagatay.civici@gmail.com>
Date: Tue, 2 Jul 2019 15:57:03 +0300
Subject: [PATCH] Filtering for DataTable

---
 src/components/column/Column.vue            |   8 ++
 src/components/datatable/DataTable.vue      |  63 +++++++++++
 src/router.js                               |   5 +
 src/views/datatable/DataTableFilterDemo.vue | 119 ++++++++++++++++++++
 4 files changed, 195 insertions(+)
 create mode 100644 src/views/datatable/DataTableFilterDemo.vue

diff --git a/src/components/column/Column.vue b/src/components/column/Column.vue
index 0c2ac72e6..2c133ecf5 100644
--- a/src/components/column/Column.vue
+++ b/src/components/column/Column.vue
@@ -49,6 +49,14 @@ export default {
         footerClass: {
             type: String,
             default: null
+        },
+        filterMatchMode: {
+            type: String,
+            default: 'startsWith'
+        },
+        excludeGlobalFilter: {
+            type: Boolean,
+            default: false
         }
     },
     render() {
diff --git a/src/components/datatable/DataTable.vue b/src/components/datatable/DataTable.vue
index 903a47da9..c1865efee 100644
--- a/src/components/datatable/DataTable.vue
+++ b/src/components/datatable/DataTable.vue
@@ -21,6 +21,7 @@
                             <ColumnSlot :column="col" type="header" v-if="col.$scopedSlots.header" />
                             <span class="p-column-title" v-if="col.header">{{col.header}}</span>
                             <span v-if="col.sortable" :class="getSortableColumnIcon(col)"></span>
+                            <ColumnSlot :column="col" type="filter" v-if="col.$scopedSlots.filter" />
                         </th>
                     </tr>
                 </thead>
@@ -66,6 +67,7 @@
 
 <script>
 import ObjectUtils from '../utils/ObjectUtils';
+import FilterUtils from '../utils/FilterUtils';
 import DomHandler from '../utils/DomHandler';
 import Paginator from '../paginator/Paginator';
 
@@ -175,6 +177,10 @@ export default {
         sortMode: {
             type: String,
             default: 'single'
+        },
+        filters: {
+            type: Object,
+            default: null
         }
     },
     data() {
@@ -369,6 +375,53 @@ export default {
                 this.d_multiSortMeta.push(meta);
 
             this.d_multiSortMeta = [...this.d_multiSortMeta];
+        },
+        filter(data) {
+            let filteredValue = [];
+
+            for(let i = 0; i < data.length; i++) {
+                let localMatch = true;
+                let globalMatch = false;
+
+                for(let j = 0; j < this.columns.length; j++) {
+                    let col = this.columns[j];
+                    let columnField = col.field;
+                    
+                    //local
+                    if (this.filters.hasOwnProperty(columnField)) {
+                        let filterValue = this.filters[columnField];
+                        let dataFieldValue = ObjectUtils.resolveFieldData(data[i], columnField);
+                        let filterConstraint = FilterUtils[col.filterMatchMode];
+
+                        if (!filterConstraint(dataFieldValue, filterValue)) {
+                            localMatch = false;
+                        }
+
+                        if (!localMatch) {
+                            break;
+                        }
+                    }
+
+                    if (!col.excludeGlobalFilter && this.hasGlobalFilter && !globalMatch) {
+                        globalMatch = FilterUtils.contains(ObjectUtils.resolveFieldData(data[i], columnField), this.filters['global']);
+                    }
+                }
+
+                let matches = localMatch;
+                if(this.hasGlobalFilter) {
+                    matches = localMatch && globalMatch;
+                }
+
+                if(matches) {
+                    filteredValue.push(data[i]);
+                }
+            }
+
+            if (filteredValue.length === data.length) {
+                filteredValue = data;
+            }
+
+            return filteredValue;
         }
     },
     computed: {
@@ -389,6 +442,10 @@ export default {
                         data = this.sortMultiple(data);
                 }
 
+                if (this.hasFilters) {
+                    data = this.filter(data);
+                }
+
                 if (this.paginator) {
                     const first = this.lazy ? 0 : this.d_first;
                     return data.slice(first, first + this.d_rows);
@@ -431,6 +488,12 @@ export default {
             }
 
             return hasFooter;
+        },
+        hasFilters() {
+            return this.filters && Object.keys(this.filters).length > 0 && this.filters.constructor === Object;
+        },
+        hasGlobalFilter() {
+            return this.filters && this.filters.hasOwnProperty('global');
         }
     },
     components: {
diff --git a/src/router.js b/src/router.js
index 5126d60ea..ce7ff47eb 100644
--- a/src/router.js
+++ b/src/router.js
@@ -125,6 +125,11 @@ export default new Router({
 			path: '/datatable/sort',
 			name: 'datatablesort',
 			component: () => import('./views/datatable/DataTableSortDemo.vue')
+        },
+        {
+			path: '/datatable/filter',
+			name: 'datatablefilter',
+			component: () => import('./views/datatable/DataTableFilterDemo.vue')
 		},
 		{
 			path: '/dataview',
diff --git a/src/views/datatable/DataTableFilterDemo.vue b/src/views/datatable/DataTableFilterDemo.vue
new file mode 100644
index 000000000..d28a53758
--- /dev/null
+++ b/src/views/datatable/DataTableFilterDemo.vue
@@ -0,0 +1,119 @@
+<template>
+	<div>
+        <DataTableSubMenu />
+
+		<div class="content-section introduction">
+			<div class="feature-intro">
+				<h1>DataTable - Filter</h1>
+				<p>Filtering is enabled by defining a filter template per column to populate the filters property of the DataTable.</p>
+			</div>
+		</div>
+
+		<div class="content-section implementation">
+			<DataTable :value="cars" :filters="filters" :paginator="true" :rows="10">
+                <template #header>
+                    <div style="text-align: right">
+                        <i class="pi pi-search" style="margin: 4px 4px 0px 0px;"></i>
+                        <InputText v-model="filters['global']" placeholder="Global Search" size="50" />
+                    </div>
+                </template>
+                <Column field="vin" header="Vin" filterMatchMode="startsWith">
+                    <template #filter>
+                        <InputText type="text" v-model="filters['vin']" class="p-column-filter" />
+                    </template>
+                </Column>
+                <Column field="year" header="Year" filterMatchMode="contains">
+                    <template #filter>
+                        <InputText type="text" v-model="filters['year']" class="p-column-filter" />
+                    </template>
+                </Column>
+                <Column field="brand" header="Brand" filterMatchMode="equals">
+                    <template #filter>
+                        <Dropdown v-model="filters['brand']" :options="brands" optionLabel="brand" optionValue="value" placeholder="Select a Brand" class="p-column-filter">
+                            <template #option="slotProps">
+                                <div class="p-clearfix p-dropdown-car-option">
+                                    <img :alt="slotProps.option.brand" :src="'demo/images/car/' + slotProps.option.brand + '.png'" />
+                                    <span>{{slotProps.option.brand}}</span>
+                                </div>
+                            </template>
+                        </Dropdown>
+                    </template>
+                </Column>
+                <Column field="color" header="Color" filterMatchMode="in">
+                    <template #filter>
+                        <MultiSelect v-model="filters['color']" :options="colors" optionLabel="name" optionValue="value" placeholder="Select a Color" />
+                    </template>
+                </Column>
+            </DataTable>
+		</div>
+	</div>
+</template>
+
+<script>
+import CarService from '../../service/CarService';
+import DataTableSubMenu from './DataTableSubMenu';
+
+export default {
+    data() {
+        return {
+            filters: {},
+            brands: [
+                {brand: 'Audi', value: 'Audi'},
+                {brand: 'BMW', value: 'BMW'},
+                {brand: 'Fiat', value: 'Fiat'},
+                {brand: 'Honda', value: 'Honda'},
+                {brand: 'Jaguar', value: 'Jaguar'},
+                {brand: 'Mercedes', value: 'Mercedes'},
+                {brand: 'Renault', value: 'Renault'},
+                {brand: 'Volkswagen', value: 'Volkswagen'},
+                {brand: 'Volvo', value: 'Volvo'}
+            ],
+            colors: [
+                {name: 'White', value: 'White'},
+                {name: 'Green', value: 'Green'},
+                {name: 'Silver', value: 'Silver'},
+                {name: 'Black', value: 'Black'},
+                {name: 'Red', value: 'Red'},
+                {name: 'Maroon', value: 'Maroon'},
+                {name: 'Brown', value: 'Brown'},
+                {name: 'Orange', value: 'Orange'},
+                {name: 'Blue', value: 'Blue'}
+            ],
+            cars: null
+        }
+    },
+    carService: null,
+    created() {
+        this.carService = new CarService();
+    },
+    mounted() {
+        this.carService.getCarsLarge().then(data => this.cars = data);
+    },
+    components: {
+        'DataTableSubMenu': DataTableSubMenu
+    }
+}
+</script>
+
+<style lang="scss" scoped>
+/deep/ .p-dropdown-label {
+    text-align: left;
+}
+
+.p-multiselect {
+    width: 100%;
+}
+
+.p-dropdown-car-option {
+    img {
+        vertical-align: middle;
+        margin-right: .5em;
+        width: 24px;
+    }
+
+    span {
+        float: right;
+        margin-top: .125em;
+    }
+}
+</style>