fix #18

* allow user to customize class for header cell

* add corresponding story

* allow user to customize inline-style for header cell

* add corresponding story

* [test] unit test for headerStyle

* [test] unit test for headerClasses

* update Document

docs/columns.md

@@ -16,6 +16,8 @@ Available properties in a column object:
 * [headerTitle](#headerTitle)
 * [headerEvents](#headerEvents)
 * [headerAlign](#headerAlign)
+* [headerClasses](#headerClasses)
+* [headerStyle](#headerStyle)
 
 Following is a most simplest and basic usage:
 
@@ -93,6 +95,20 @@ In addition, `classes` also accept a callback function which have more power to
 * `row`
 * `colIndex`
 
+## <a name='headerClasses'>column.headerClasses - [String | Function]</a>
+It's availabe to have customized class on table header column:
+
+```js
+{
+  // omit...
+  headerClasses: 'id-custom-cell'
+}
+```
+In addition, similar to [`column.classes`](#classes), `headerClasses` also accept a callback function which have more power to custom the css class on header column. This callback function take two arguments and a string is expect to return: 
+
+* `column`
+* `colIndex`
+
 ## <a name='style'>column.style - [Object | Function]</a>
 It's availabe to have custom class on table column:
 
@@ -104,6 +120,17 @@ It's availabe to have custom class on table column:
 ```
 `style` like [`column.classes`](#classes), it accept a callback function too and have same arguments: `cell`, `row` and `colIndex`.
 
+## <a name='headerStyle'>column.headerStyle - [Object | Function]</a>
+It's availabe to have customized inline-style on table header column:
+
+```js
+{
+  // omit...
+  headerStyle: { backgroundColor: 'green' }
+}
+```
+`headerStyle` like [`column.headerClasses`](#headerClasses), it accept a callback function as well and have same arguments: `column` and `colIndex`.
+
 ## <a name='title'>column.title - [Bool | Function]</a>
 `react-bootstrap-table2` is disable [`HTML title`](https://www.w3schools.com/tags/tag_title.asp) as default. You can assign `title` as `true` to enable the HTML title on table column. In addition, you can custom the title via a callback function:
 

packages/react-bootstrap-table2-example/examples/header-columns/column-class-table.js

@@ -0,0 +1,62 @@
+/* eslint no-unused-vars: 0 */
+import React from 'react';
+
+import { BootstrapTable } from 'react-bootstrap-table2';
+
+const products = [];
+
+function addProducts(quantity) {
+  const startId = products.length;
+  for (let i = 0; i < quantity; i += 1) {
+    const id = startId + i;
+    products.push({
+      id,
+      name: `Item name ${id}`,
+      price: 2100 + i
+    });
+  }
+}
+
+addProducts(5);
+
+const columns = [{
+  dataField: 'id',
+  text: 'Product ID'
+}, {
+  dataField: 'name',
+  text: 'Product Name',
+  headerClasses: 'demo-row-odd'
+}, {
+  dataField: 'price',
+  text: 'Product Price',
+  headerClasses: (column, colIndex) => {
+    if (colIndex % 2 === 0) return 'demo-row-even';
+    return 'demo-row-odd';
+  }
+}];
+
+export default () => (
+  <div>
+    <BootstrapTable keyField="id" data={ products } columns={ columns } />
+    <pre className="prettyprint lang-js"><code className="language-javascript">{`
+const columns = [{
+  dataField: 'id',
+  text: 'Product ID'
+}, {
+  dataField: 'name',
+  text: 'Product Name',
+  headerClasses: 'demo-row-odd'
+}, {
+  dataField: 'price',
+  text: 'Product Price',
+  headerClasses: (column, colIndex) => {
+    if (colIndex % 2 === 0) return 'demo-row-even';
+    return 'demo-row-odd';
+  }
+}];
+
+<BootstrapTable keyField='id' data={ products } columns={ columns } />
+    `}
+    </code></pre>
+  </div>
+);

packages/react-bootstrap-table2-example/examples/header-columns/column-style-table.js

@@ -0,0 +1,78 @@
+/* eslint no-unused-vars: 0 */
+import React from 'react';
+
+import { BootstrapTable } from 'react-bootstrap-table2';
+
+const products = [];
+
+function addProducts(quantity) {
+  const startId = products.length;
+  for (let i = 0; i < quantity; i += 1) {
+    const id = startId + i;
+    products.push({
+      id,
+      name: `Item name ${id}`,
+      price: 2100 + i
+    });
+  }
+}
+
+addProducts(5);
+
+const columns = [{
+  dataField: 'id',
+  text: 'Product ID'
+}, {
+  dataField: 'name',
+  text: 'Product Name',
+  headerStyle: {
+    backgroundColor: '#fea'
+  }
+}, {
+  dataField: 'price',
+  text: 'Product Price',
+  headerStyle: (column, colIndex) => {
+    if (colIndex % 2 === 0) {
+      return {
+        backgroundColor: '#bbe'
+      };
+    }
+    return {
+      backgroundColor: '#fea'
+    };
+  }
+}];
+
+export default () => (
+  <div>
+    <BootstrapTable keyField="id" data={ products } columns={ columns } />
+    <pre className="prettyprint lang-js"><code className="language-javascript">{`
+const columns = [{
+  dataField: 'id',
+  text: 'Product ID'
+}, {
+  dataField: 'name',
+  text: 'Product Name',
+  headerStyle: {
+    backgroundColor: '#fea'
+  }
+}, {
+  dataField: 'price',
+  text: 'Product Price',
+  headerStyle: (column, colIndex) => {
+    if (colIndex % 2 === 0) {
+      return {
+        backgroundColor: '#bbe'
+      };
+    }
+    return {
+      backgroundColor: '#fea'
+    };
+  }
+}];
+
+<BootstrapTable keyField='id' data={ products } columns={ columns } />
+    `}
+    </code></pre>
+  </div>
+);

packages/react-bootstrap-table2-example/stories/index.js

@@ -26,6 +26,8 @@ import HeaderColumnFormatTable from 'examples/header-columns/column-format-table
 import HeaderColumnAlignTable from 'examples/header-columns/column-align-table';
 import HeaderColumnTitleTable from 'examples/header-columns/column-title-table';
 import HeaderColumnEventTable from 'examples/header-columns/column-event-table';
+import HeaderColumnClassTable from 'examples/header-columns/column-class-table';
+import HeaderColumnStyleTable from 'examples/header-columns/column-style-table';
 
 // css style
 import 'bootstrap/dist/css/bootstrap.min.css';
@@ -59,4 +61,6 @@ storiesOf('Work on Header Columns', module)
   .add('Column Formatter', () => <HeaderColumnFormatTable />)
   .add('Column Align', () => <HeaderColumnAlignTable />)
   .add('Column Title', () => <HeaderColumnTitleTable />)
-  .add('Column Event', () => <HeaderColumnEventTable />);
+  .add('Column Event', () => <HeaderColumnEventTable />)
+  .add('Customize Column Class', () => <HeaderColumnClassTable />)
+  .add('Customize Column Style', () => <HeaderColumnStyleTable />);

packages/react-bootstrap-table2/src/header-cell.js

@@ -11,23 +11,32 @@ const HeaderCell = ({ column, index }) => {
     headerTitle,
     headerAlign,
     headerFormatter,
-    headerEvents
+    headerEvents,
+    headerClasses,
+    headerStyle
   } = column;
   const attrs = {
     ...headerEvents
   };
-  const headerStyle = {};
   const children = headerFormatter ? headerFormatter(column, index) : text;
+  const cellClasses = _.isFunction(headerClasses) ? headerClasses(column, index) : headerClasses;
+
+  let cellStyle = {};
+
+  if (headerStyle) {
+    cellStyle = _.isFunction(headerStyle) ? headerStyle(column, index) : headerStyle;
+  }
 
   if (headerTitle) {
     attrs.title = _.isFunction(headerTitle) ? headerTitle(column, index) : text;
   }
 
   if (headerAlign) {
-    headerStyle.textAlign = _.isFunction(headerAlign) ? headerAlign(column, index) : headerAlign;
+    cellStyle.textAlign = _.isFunction(headerAlign) ? headerAlign(column, index) : headerAlign;
   }
 
-  attrs.style = headerStyle;
+  attrs.style = cellStyle;
+  attrs.className = cellClasses;
 
   if (hidden) {
     attrs.style.display = 'none';

packages/react-bootstrap-table2/test/header-cell.test.js

@@ -191,4 +191,100 @@ describe('HeaderCell', () => {
       expect(column.headerEvents.onClick.callCount).toBe(1);
     });
   });
+
+  describe('when column.headerStyle prop is defined', () => {
+    let column;
+
+    beforeEach(() => {
+      column = {
+        dataField: 'id',
+        text: 'ID'
+      };
+    });
+
+    describe('when headerStyle is an object', () => {
+      beforeEach(() => {
+        column.headerStyle = { backgroundColor: 'red' };
+        wrapper = shallow(<HeaderCell column={ column } index={ index } />);
+      });
+
+      it('should render successfully', () => {
+        expect(wrapper.length).toBe(1);
+        expect(wrapper.find('th').prop('style')).toEqual(column.headerStyle);
+      });
+    });
+
+    describe('when headerStyle is a function', () => {
+      const returnStyle = { backgroundColor: 'red' };
+      let styleCallBack;
+
+      beforeEach(() => {
+        styleCallBack = sinon.stub()
+          .withArgs(column, index)
+          .returns(returnStyle);
+        column.headerStyle = styleCallBack;
+        wrapper = shallow(<HeaderCell column={ column } index={ index } />);
+      });
+
+      afterEach(() => { styleCallBack.reset(); });
+
+      it('should render successfully', () => {
+        expect(wrapper.length).toBe(1);
+        expect(wrapper.find('th').prop('style')).toEqual(returnStyle);
+      });
+
+      it('should call custom style function correctly', () => {
+        expect(styleCallBack.callCount).toBe(1);
+        expect(styleCallBack.calledWith(column, index)).toBe(true);
+      });
+    });
+  });
+
+  describe('when column.headerClasses prop is defined', () => {
+    let column;
+
+    beforeEach(() => {
+      column = {
+        dataField: 'id',
+        text: 'ID'
+      };
+    });
+
+    describe('when headerClasses is an object', () => {
+      beforeEach(() => {
+        column.headerClasses = 'td-test-class';
+        wrapper = shallow(<HeaderCell column={ column } index={ index } />);
+      });
+
+      it('should render successfully', () => {
+        expect(wrapper.length).toBe(1);
+        expect(wrapper.hasClass(column.headerClasses)).toBe(true);
+      });
+    });
+
+    describe('when headerClasses is a function', () => {
+      const returnClasses = 'td-test-class';
+      let classesCallBack;
+
+      beforeEach(() => {
+        classesCallBack = sinon.stub()
+          .withArgs(column, index)
+          .returns(returnClasses);
+        column.headerClasses = classesCallBack;
+        wrapper = shallow(<HeaderCell column={ column } index={ index } />);
+      });
+
+      afterEach(() => { classesCallBack.reset(); });
+
+      it('should render successfully', () => {
+        expect(wrapper.length).toBe(1);
+        expect(wrapper.hasClass(returnClasses)).toBe(true);
+      });
+
+      it('should call custom classes function correctly', () => {
+        expect(classesCallBack.callCount).toBe(1);
+        expect(classesCallBack.calledWith(column, index)).toBe(true);
+      });
+    });
+  });
 });