Feature/add multiselect filter

dev/App.vue

@@ -135,6 +135,30 @@ export default {
             ],
           },
         },
+        {
+          label: 'Multiselect',
+          field: 'multiselect',
+          filterOptions: {
+            enabled: true,
+            filterMultiselectDropdownItems: [
+              { id: 1, label: 'hello'},
+              'oh no'
+            ],
+          },
+        },
+        {
+          label: 'Average age',
+          field: 'average',
+          type: 'number',
+          filterOptions: {
+            enabled: true,
+            filterMultiselectDropdownItems: [
+              1,
+              1.5,
+              2
+            ],
+          },
+        },
       ],
       rows: [
         // { id:1, name:"John", age: 20, createdAt: '2018-02-18T00:00:43-05:00',score: 0.03343 },
@@ -146,6 +170,8 @@ export default {
           score: 0.03343,
           bool: true,
           exact: 'match',
+          multiselect: 'hello',
+          average: 1
         },
         {
           id: 3,
@@ -155,6 +181,8 @@ export default {
           score: 0.03343,
           bool: true,
           exact: 'match',
+          multiselect: 'oh no',
+          average: null
         },
         {
           id: 4,
@@ -164,6 +192,7 @@ export default {
           score: 0.03343,
           bool: false,
           exact: null,
+          multiselect: null
         },
         {
           id: 5,
@@ -173,6 +202,8 @@ export default {
           score: 0.03343,
           bool: null,
           exact: 'rematch',
+          multiselect: 'hello world',
+          average: 2
         },
         {
           id: 5,
@@ -182,6 +213,8 @@ export default {
           score: 0.03343,
           bool: null,
           exact: 'rematch',
+          multiselect: 'hello',
+          average: 3
         },
         {
           id: 5,
@@ -191,6 +224,8 @@ export default {
           score: 0.03343,
           bool: null,
           exact: null,
+          multiselect: 'hello',
+          average: 2
         },
         {
           id: 6,
@@ -200,6 +235,8 @@ export default {
           score: 0.03343,
           bool: true,
           exact: 'match',
+          multiselect: 'hello',
+          average: 1.5
         },
         {
           id: 7,
@@ -209,6 +246,8 @@ export default {
           score: null,
           bool: 'false',
           exact: null,
+          multiselect: 'hello',
+          average: 1
         },
         {
           id: 8,
@@ -218,6 +257,8 @@ export default {
           score: 0.03343,
           bool: true,
           exact: 'rematch',
+          multiselect: 'hello',
+          average: 1
         },
       ],
     };

package.json

@@ -48,7 +48,8 @@
     "lodash.clonedeep": "^4.5.0",
     "lodash.filter": "^4.6.0",
     "lodash.foreach": "^4.5.0",
-    "lodash.isequal": "^4.5.0"
+    "lodash.isequal": "^4.5.0",
+    "vue-select": "^3.1.0"
   },
   "devDependencies": {
     "@vuepress/plugin-google-analytics": "^1.0.0-rc.1",

src/components/Table.vue

@@ -1175,6 +1175,33 @@ export default {
       return classes;
     },
 
+    filterMultiselectItems(column, row) {
+      const columnFieldName = column.field;
+      const columnFilters = this.columnFilters[columnFieldName];
+      if (column.filterOptions && column.filterOptions.filterMultiselectDropdownItems) {
+        if (columnFilters.length === 0) {
+          return true;
+        }
+
+        // Otherwise Use default filters
+        const typeDef = column.typeDef;
+        for (let filter of columnFilters) {
+          let filterLabel = filter;
+          if (typeof filter === 'object') {
+            filterLabel = filter.label;
+          }
+          if (typeDef.filterPredicate(
+            this.collect(row, columnFieldName),
+            filterLabel
+          )) {
+            return true;
+          }
+        }
+        return false;
+      }
+      return undefined;
+    },
+
     // method to filter rows
     filterRows(columnFilters, fromFilter = true) {
       // if (!this.rows.length) return;
@@ -1228,6 +1255,12 @@ export default {
                     this.columnFilters[col.field]
                   );
                 }
+
+                const filterMultiselect = this.filterMultiselectItems(col, row);
+                if (filterMultiselect !== undefined) {
+                  return filterMultiselect;
+                }
+
                 // Otherwise Use default filters
                 const { typeDef } = col;
                 return typeDef.filterPredicate(

src/components/VgtFilterRow.vue

@@ -8,7 +8,7 @@
 
     <div
       v-if="isFilterable(column)">
-      <input v-if="!isDropdown(column)"
+      <input v-if="!isDropdown(column) && !isMultiselectDropdown(column)"
         type="text"
         class="vgt-input"
         :placeholder="getPlaceholder(column)"
@@ -41,6 +41,16 @@
           :key="i"
           :value="option.value">{{ option.text }}</option>
       </select>
+
+      <v-select v-if="isMultiselectDropdown(column)"
+        :options="column.filterOptions.filterMultiselectDropdownItems"
+        :loading="column.filterOptions.loading"
+        :placeholder="getPlaceholder(column)"
+        multiple
+        @input="(selectedItems) => updateFiltersOnKeyup(column, selectedItems)"
+        ref="vgt-multiselect"
+      />
+
     </div>
   </th>
 </tr>
@@ -93,6 +103,12 @@ export default {
   methods: {
     reset(emitEvent = false) {
       this.columnFilters = {};
+
+      // Clear the selection in the multiselect
+      this.$refs['vgt-multiselect'].forEach((ref) => {
+        ref.clearSelection();
+      });
+
       if (emitEvent) {
         this.$emit('filter-changed', this.columnFilters);
       }
@@ -119,6 +135,14 @@ export default {
         && typeof column.filterOptions.filterDropdownItems[0] !== 'object';
     },
 
+    isMultiselectDropdown(column) {
+      return (
+        this.isFilterable(column) &&
+        column.filterOptions &&
+        column.filterOptions.filterMultiselectDropdownItems
+      );
+    },
+
     // get column's defined placeholder or default one
     getPlaceholder(column) {
       const placeholder = (this.isFilterable(column) && column.filterOptions.placeholder) || `Filter ${column.label}`;

src/index.js

@@ -1,7 +1,9 @@
 import VueGoodTable from './components/Table.vue';
+import vSelect from 'vue-select';
 
 const VueGoodTablePlugin = {
   install(Vue, options) {
+    Vue.component('v-select', vSelect);
     Vue.component(VueGoodTable.name, VueGoodTable);
   },
 };

src/styles/_input.scss

@@ -22,4 +22,23 @@
     outline: none;
     border-color: $link-color;
   }
-}
+}
+
+.v-select {
+  border-radius: 4px;
+  color: $text-color;
+  &::placeholder { /* Chrome, Firefox, Opera, Safari 10.1+ */
+    color: $text-color;
+    opacity: 0.3; /* Firefox */
+  }
+  &:focus {
+    outline: none;
+    border-color: $link-color;
+  }
+  input {
+   color: $text-color
+  }
+  .vs__open-indicator {
+    fill: $text-color
+  }
+}

src/styles/black-rhino/black-rhino.scss

@@ -68,6 +68,16 @@
       opacity: 0.3; /* Firefox */
     }
   }
+
+  .v-select {
+    background-color: $input-bg;
+    input {
+      color: $text-color;
+    }
+    .vs__open-indicator {
+      fill: $text-color
+    }
+  }
 }
 
 .vgt-wrap.black-rhino{

src/styles/nocturnal/nocturnal.scss

@@ -64,6 +64,16 @@
       opacity: 0.3; /* Firefox */
     }
   }
+
+  .v-select {
+    background-color: darken($thead-bg-color-2, 5%);
+    input {
+      color: $text-color;
+    }
+    .vs__open-indicator {
+      fill: $text-color
+    }
+  }
 }
 
 .vgt-wrap.nocturnal{

src/styles/style.scss

@@ -1,3 +1,6 @@
+// V-select plugin
+@import "../../node_modules/vue-select/dist/vue-select";
+
 // base table styles
 @import './variables';
 @import './utils';

vp-docs/guide/configuration/column-filter-options.md

@@ -16,6 +16,7 @@ columns: [
       placeholder: 'Filter This Thing', // placeholder for filter input
       filterValue: 'Jane', // initial populated value for this filter
       filterDropdownItems: [], // dropdown (with selected values) instead of text input
+      filterMultiselectDropdownItems: [], // dropdown (with multiple selected values) instead of text input
       filterFn: this.columnFilterFn, //custom filter function that
       trigger: 'enter', //only trigger on enter not on keyup 
     },
@@ -61,6 +62,25 @@ filterDropdownItems: [
 ],
 ```
 
+## filterMultiselectDropdownItems
+
+type `Array of strings` or `Array of objects` with labels
+
+allows creating a dropdown for filtering multiple items as opposed to an input
+
+```javascript
+//array of strings
+filterMultiselectDropdownItems: ['Blue', 'Red', 'Yellow']
+```
+```javascript
+//array of objects
+filterMultiselectDropdownItems: [
+  { id: 1, label: 'Blue' },
+  { id: 2, label: 'Red' },
+  { id: 3, label: 'Yellow' }
+]
+```
+
 ## filterFn
 
 type `Function`