diff --git a/index.html b/index.html
index 1a3588e..7a33202 100644
--- a/index.html
+++ b/index.html
@@ -99,6 +99,11 @@
 					data,
 					inlineFilters: true,
 					dynamicRowHeight: true,
+					// filterRows(keyword, cells, colIndex) {
+					// 	return cells
+					// 		.filter(cell => cell.content.includes(keyword))
+					// 		.map(cell => cell.rowIndex);
+					// },
 					getEditor(colIndex, rowIndex, value, parent) {
 						// editing obj only for date field
 						if (colIndex != 6) return;
diff --git a/src/cellmanager.js b/src/cellmanager.js
index c5b81bd..68260d2 100644
--- a/src/cellmanager.js
+++ b/src/cellmanager.js
@@ -13,6 +13,7 @@ export default class CellManager {
             'wrapper',
             'options',
             'style',
+            'header',
             'bodyScrollable',
             'columnmanager',
             'rowmanager',
@@ -121,6 +122,10 @@ export default class CellManager {
                 this.activateFilter(colIndex);
                 return true;
             });
+
+            $.on(this.header, 'focusin', '.dt-filter', () => {
+                this.unfocusCell(this.$focusedCell);
+            });
         }
     }
 
@@ -246,6 +251,19 @@ export default class CellManager {
         this.highlightRowColumnHeader($cell);
     }
 
+    unfocusCell($cell) {
+        if (!$cell) return;
+
+        // remove cell border
+        $cell.classList.remove('dt-cell--focus');
+        this.$focusedCell = null;
+
+        // reset header background
+        if (this.lastHeaders) {
+            this.lastHeaders.forEach(header => header.classList.remove('dt-cell--highlight'));
+        }
+    }
+
     highlightRowColumnHeader($cell) {
         const {
             colIndex,
diff --git a/src/columnmanager.js b/src/columnmanager.js
index 8214795..58b4e47 100644
--- a/src/columnmanager.js
+++ b/src/columnmanager.js
@@ -269,24 +269,26 @@ export default class ColumnManager {
     bindFilter() {
         if (!this.options.inlineFilters) return;
         const handler = e => {
-            const $filterCell = $.closest('.dt-cell', e.target);
-            const {
-                colIndex
-            } = $.data($filterCell);
+            this.$filterCell = $.closest('.dt-cell', e.target);
+            const { colIndex } = $.data(this.$filterCell);
             const keyword = e.target.value;
 
-            this.datamanager.filterRows(keyword, colIndex)
-                .then(({
-                    rowsToHide,
-                    rowsToShow
-                }) => {
-                    this.rowmanager.hideRows(rowsToHide);
-                    this.rowmanager.showRows(rowsToShow);
-                });
+            this.applyFilter(keyword, colIndex);
         };
         $.on(this.header, 'keydown', '.dt-filter', debounce(handler, 300));
     }
 
+    applyFilter(keyword, colIndex) {
+        this.datamanager.filterRows(keyword, colIndex)
+            .then(({
+                rowsToHide,
+                rowsToShow
+            }) => {
+                this.rowmanager.hideRows(rowsToHide);
+                this.rowmanager.showRows(rowsToShow);
+            });
+    }
+
     applyDefaultSortOrder() {
         // sort rows if any 1 column has a default sortOrder set
         const columnsToSort = this.getColumns().filter(col => col.sortOrder !== 'none');
diff --git a/src/datamanager.js b/src/datamanager.js
index 6d38fee..d73cbaa 100644
--- a/src/datamanager.js
+++ b/src/datamanager.js
@@ -11,7 +11,6 @@ export default class DataManager {
         this.sortRows = nextTick(this.sortRows, this);
         this.switchColumn = nextTick(this.switchColumn, this);
         this.removeColumn = nextTick(this.removeColumn, this);
-        this.filterRows = nextTick(this.filterRows, this);
     }
 
     init(data, columns) {
@@ -423,31 +422,36 @@ export default class DataManager {
     }
 
     filterRows(keyword, colIndex) {
-        let rowsToHide = [];
-        let rowsToShow = [];
         const cells = this.rows.map(row => row[colIndex]);
+        let result = this.options.filterRows(keyword, cells, colIndex);
 
-        cells.forEach(cell => {
-            const hay = String(cell.content || '').toLowerCase();
-            const needle = (keyword || '').toLowerCase();
+        if (!result) {
+            result = this.getAllRowIndices();
+        }
 
-            if (!needle || hay.includes(needle)) {
-                rowsToShow.push(cell.rowIndex);
-            } else {
-                rowsToHide.push(cell.rowIndex);
-            }
+        if (!result.then) {
+            result = Promise.resolve(result);
+        }
+
+        return result.then(rowsToShow => {
+            this._filteredRows = rowsToShow;
+
+            const rowsToHide = this.getAllRowIndices()
+                .filter(index => !rowsToShow.includes(index));
+
+            return {
+                rowsToHide,
+                rowsToShow
+            };
         });
-
-        this._filteredRows = rowsToShow;
-
-        return {
-            rowsToHide,
-            rowsToShow
-        };
     }
 
     getFilteredRowIndices() {
-        return this._filteredRows || this.rows.map(row => row.meta.rowIndex);
+        return this._filteredRows || this.getAllRowIndices();
+    }
+
+    getAllRowIndices() {
+        return this.rows.map(row => row.meta.rowIndex);
     }
 
     getRowCount() {
diff --git a/src/defaults.js b/src/defaults.js
index 6742c98..ca10dd6 100644
--- a/src/defaults.js
+++ b/src/defaults.js
@@ -1,3 +1,5 @@
+import filterRows from './filterRows';
+
 export default {
     columns: [],
     data: [],
@@ -40,6 +42,7 @@ export default {
         desc: '↓',
         none: ''
     },
+    filterRows: filterRows,
     freezeMessage: '',
     getEditor: null,
     serialNoColumn: true,
diff --git a/src/filterRows.js b/src/filterRows.js
new file mode 100644
index 0000000..fec0831
--- /dev/null
+++ b/src/filterRows.js
@@ -0,0 +1,93 @@
+import { isNumber } from './utils';
+
+export default function filterRows(keyword, cells, colIndex) {
+    let filter = guessFilter(keyword);
+    let filterMethod = getFilterMethod(filter);
+
+    if (filterMethod) {
+        return filterMethod(filter.text, cells);
+    }
+
+    return cells.map(cell => cell.rowIndex);
+};
+
+function getFilterMethod(filter) {
+    let filterMethodMap = {
+        contains(keyword, cells) {
+            return cells
+                .filter(cell => {
+                    const hay = String(cell.content || '').toLowerCase();
+                    const needle = (keyword || '').toLowerCase();
+                    return !needle || hay.includes(needle);
+                })
+                .map(cell => cell.rowIndex);
+        },
+
+        greaterThan(keyword, cells) {
+            return cells
+                .filter(cell => {
+                    const value = Number(cell.content);
+                    return value > keyword;
+                })
+                .map(cell => cell.rowIndex);
+        },
+
+        lessThan(keyword, cells) {
+            return cells
+                .filter(cell => {
+                    const value = Number(cell.content);
+                    return value < keyword;
+                })
+                .map(cell => cell.rowIndex);
+        },
+
+        range(rangeValues, cells) {
+            return cells
+                .filter(cell => {
+                    const value = Number(cell.content);
+                    return value >= rangeValues[0] && value <= rangeValues[1];
+                })
+                .map(cell => cell.rowIndex);
+        }
+    };
+
+    return filterMethodMap[filter.type];
+}
+
+function guessFilter(keyword) {
+    if (keyword.length === 1) return {};
+
+    if (keyword.startsWith('>')) {
+        if (isNumber(keyword.slice(1))) {
+            return {
+                type: 'greaterThan',
+                text: Number(keyword.slice(1).trim())
+            };
+        }
+
+        keyword = keyword.slice(1);
+    }
+
+    if (keyword.startsWith('<')) {
+        if (isNumber(keyword.slice(1))) {
+            return {
+                type: 'lessThan',
+                text: Number(keyword.slice(1).trim())
+            };
+        }
+
+        keyword = keyword.slice(1);
+    }
+
+    if (keyword.split(':').length === 2 && keyword.split(':').every(isNumber)) {
+        return {
+            type: 'range',
+            text: keyword.split(':').map(v => v.trim()).map(Number)
+        };
+    }
+
+    return {
+        type: 'contains',
+        text: keyword.toLowerCase()
+    };
+}
diff --git a/src/rowmanager.js b/src/rowmanager.js
index 881f32d..c161aa5 100644
--- a/src/rowmanager.js
+++ b/src/rowmanager.js
@@ -277,7 +277,7 @@ export default class RowManager {
 
     getFilterInput(props) {
         const dataAttr = makeDataAttributeString(props);
-        return `<input class="dt-filter dt-input" type="text" ${dataAttr} />`;
+        return `<input class="dt-filter dt-input" type="text" ${dataAttr} tabindex="1" />`;
     }
 
     selector(rowIndex) {