How to change CSS of columns - ReactTable

Question

I am using react-table in my application.

I am stuck in doing one thing i.e. changing the CSS of columns while a column is being resized.

Currently when you resize a column only cursor changes. What I want is to add border to the selected column.

I searched for this on SO and google as well. But couldn't find anything useful. And In the documentation as well nothing is mentioned about this topic as well.

Update

Now I am able to add border while dragging the column while resizing. I am able to do so by adding and removing the class.

What I did to do so:

Created a var in the state for className:

  this.state = {
         addBorder: null
   }

Passed this class name in my column:

     const columns = [{
    Header: 'Name',
    accessor: 'name', // String-based value accessors!,
    headerClassName: this.state.addBorder,
    className: this.state.addBorder
}, {
    Header: 'Age',
    accessor: 'age',
    Cell: props => <span className='number'>{2}</span> // Custom cell components!
}, {
    id: 'friendName', // Required because our accessor is not a string
    Header: 'Friend Name',
    accessor: d => d.friend.name // Custom value accessors!
}, {
    Header: props => <span>Friend Age</span>, // Custom header components!
    accessor: 'friend.age'
}];

return (
    <div onMouseUp={this.handleMouseUp}>
    <ReactTable
        data={data}
        columns={columns} 
        resizable={true}
        onResizedChange={(col, e) => {
            const column = col[col.length-1];
            this.setState({addBorder: column.id})
        }} />
        </div>
)
}

To remove the class when dragging ends:

   handleMouseUp (e) {
    this.setState({addBorder: null});
}

But I am still not able to add border on hover.

Now, I am sending my custom HTML in header props. And in my HTML I have made an extra div. And I have moved this div to right. And on hover of this div, I am emitting mouse events and changing CSS accordingly.

But Existing div in the header that is responsible for resizing column is overlapping with my Div.

  Header: props => <div className='header-div'> Name <div onMouseOver = {() => {
        console.log('mose');
        this.setState({className: 'addBorder'});
    }} className='hover-div' onMouseOut = {() => {console.log('sdasd');this.setState({className: null});}}> </div></div> ,

Answer 1

From what I understand, you want to add some border when you hover over a column header. If my understanding is correct, you can use :hover pseudo selector over the header class

.hdrCls:hover {
  border: 2px solid rgba(0,0,0,0.6) !important;
}

Update :

You can manipulate state in onResizedChange handler exposed by react-table

onResizedChange={(newResized, event) => {
  let resizedCol = newResized.slice(-1)[0].id;
  if(this.state.activeCol !== resizedCol) {
    this.setState({
      activeCol: resizedCol,
      resizing: true
    })
  }
}}

Also, make sure you have to make the resizing state to false on mouseup event. For that I have come up with the below solution.

componentDidUpdate(props, state) {
  if (this.state.resizing && !state.resizing) {
    document.addEventListener('mouseup', this.onMouseUp);
  } else if (!this.state.resizing && state.resizing) {
    document.removeEventListener('mouseup', this.onMouseUp);
  }
}

onMouseUp = (evt) => {
  this.setState({
    activeCol: '',
    resizing: false
  });
  evt.stopPropagation();
  evt.preventDefault();
}      

For reference:

const ReactTable = window.ReactTable.default

class App extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      activeCol: '',
      resizing: false
    }
  }
  
  componentDidUpdate(props, state) {
    if (this.state.resizing && !state.resizing) {
      document.addEventListener('mouseup', this.onMouseUp);
    } else if (!this.state.resizing && state.resizing) {
      document.removeEventListener('mouseup', this.onMouseUp);
    }
  }
  
  onMouseUp = (evt) => {
    this.setState({
      activeCol: '',
      resizing: false
    });
    evt.stopPropagation();
    evt.preventDefault();
  }
  
  render() {
    const data = [{
      name:"Mark",
      age:24
    },
    {
      name:"Derek",
      age:26
    }]

    const columns = [{
          Header: 'Name',
          accessor: 'name', // String-based value accessors!,
          headerClassName: 'hdrCls',
          className: (this.state.activeCol === 'name') && this.state.resizing ? 'borderCellCls' : 'defaultCellCls'
      }, {
          Header: 'Age',
          accessor: 'age',
          headerClassName: 'hdrCls',
          className: (this.state.activeCol === 'age') && this.state.resizing ? 'borderCellCls' : 'defaultCellCls'
      }];

    return <ReactTable
      data = { data }
      columns = { columns }
      showPagination= {false}
      onResizedChange={(newResized, event) => {
        let resizedCol = newResized.slice(-1)[0].id;
        if(this.state.activeCol !== resizedCol) {
          this.setState({
            activeCol: resizedCol,
            resizing: true
          })
        }
      }}
    />
  }
}

ReactDOM.render( < App / > , document.getElementById("app"))

.hdrCls:hover {
  border: 2px solid rgba(0,0,0,0.6) !important;
}


.borderCellCls {
  border-right: 2px solid rgba(0,0,0,0.6) !important;
  border-left: 2px solid rgba(0,0,0,0.6) !important;
}

.defaultCellCls {
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-table/6.7.6/react-table.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/react-table/6.7.6/react-table.css"></link>
<div id="app"></div>

You can play around with CSS. Hope this is what you want and hope this helps.

Update:

I think you have to play with CSS to achieve what you desire.

.borderCellCls {
   border-right: 2px solid rgba(0,0,0,0.6) !important;
   border-left: 2px solid rgba(0,0,0,0.6) !important;
}