
#tooltip

A tooltip can be displayed when hovering the mouse over the column header and data area.

#### Display Tooltip

Set whether to display tooltips for the entire header.

```js
const fields = [
  {
    fieldName: "KorName",
    dataType: "text"
  },
  {
    fieldName: "Gender",
    dataType: "text"
  },
  {
    fieldName: "Age",
    dataType: "number"
  },
  {
    fieldName: "Phone",
    dataType: "text"
  },
  {
    fieldName: "ProductId",
    dataType: "text"
  },
  {
    fieldName: "KorCountry",
    dataType: "text"
  },
  {
    fieldName: "OrderDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "CardNumber",
    dataType: "text"
  },
  {
    fieldName: "Monetary",
    dataType: "text"
  },
  {
    fieldName: "StartDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "EndDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "ToMonth",
    dataType: "number"
  },
  {
    fieldName: "Month",
    dataType: "number"
  },
  {
    fieldName: "Year",
    dataType: "number"
  },
  {
    fieldName: "InterestRate",
    dataType: "number"
  },
  {
    fieldName: "SaveCost",
    dataType: "number"
  },
  {
    fieldName: "SaveMaturity",
    dataType: "number"
  },
  {
    fieldName: "CurrentSave",
    dataType: "number"
  }
];

const columns = [
  {
    name: "KorName",
    fieldName: "KorName",
    width: "60",
    header: {
      text: "Name"
    },
    renderer: {
      showTooltip: true
    }
  },
  {
    name: "Gender",
    fieldName: "Gender",
    width: "40",
    header: {
      text: "Gender"
    }
  },
  {
    name: "Age",
    fieldName: "Age",
    width: "40",
    header: {
      text: "Age"
    },
    styleName: "right-column"
  },
  {
    name: "Phone",
    fieldName: "Phone",
    width: "100",
    header: {
      text: "Phone"
    }
  },
  {
    name: "ProductId",
    fieldName: "ProductId",
    width: "120",
    header: {
      text: "Product ID"
    }
  },
  {
    name: "KorCountry",
    fieldName: "KorCountry",
    width: "100",
    header: {
      text: "Investment Country"
    }
  },
  {
    name: "OrderDate",
    fieldName: "OrderDate",
    width: "100",
    header: {
      text: "Order Date"
    }
  },
  {
    name: "CardNumber",
    fieldName: "CardNumber",
    width: "140",
    header: {
      text: "Card Number"
    }
  },
  {
    name: "Monetary",
    fieldName: "Monetary",
    width: "40",
    header: {
      text: "Currency"
    }
  },
  {
    name: "StartDate",
    fieldName: "StartDate",
    width: "100",
    header: {
      text: "First Payment Date"
    }
  },
  {
    name: "EndDate",
    fieldName: "EndDate",
    width: "100",
    header: {
      text: "End Date"
    }
  },
  {
    name: "ToMonth",
    fieldName: "ToMonth",
    width: "50",
    header: {
      text: "Payment Count"
    },
    styleName: "right-column"
  },
  {
    name: "Month",
    fieldName: "Month",
    width: "50",
    header: {
      text: "Remaining Count"
    },
    styleName: "right-column"
  },
  {
    name: "InterestRate",
    fieldName: "InterestRate",
    width: "50",
    numberFormat: "0.00",
    header: {
      text: "Interest Rate"
    },
    styleName: "right-column"
  },
  {
    name: "SaveCost",
    fieldName: "SaveCost",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Payment Amount"
    },
    styleName: "right-column"
  },
  {
    name: "SaveMaturity",
    fieldName: "SaveMaturity",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Maturity Amount"
    },
    styleName: "right-column"
  },
  {
    name: "CurrentSave",
    fieldName: "CurrentSave",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Current Balance"
    },
    styleName: "right-column"
  }
];

const { gridView, dataProvider } = RealGrid.createGrid("realgrid", {
  columns,
  header: {
    height: 40,
    showTooltip: true
  },
  display: {
    rowHeight: 36,
    emptyMessage: "No data to display."
  },
  edit: {
    insertable: true,
    appendable: true
  },
  footer: {
    height: 40
  },
  stateBar: {
    width: 16
  },
  onInitialized: (grid) => {
    fetch('/data/en/simple_data.json')
      .then(response => response.json())
      .then(data => {
        grid.getDataSource().setRows(data);
      });
  }
}, {
  fields
});

window.gridView = gridView;
window.dataProvider = dataProvider;
```

```js
gridView.setHeader({ showTooltip: true });
```

To change the header tooltip to different content, specify a string in `header.tooltip`.

```js
//
When first set up..
var columns = [{
     name: "KorName",
     fieldName: "KorName",
     width: "60",
     header: {
       text: "Name",
       //Header tooltip settings
       showTooltip:true;
       tooltip:"name"
     },
     renderer:{
       //Data area tooltip settings
       showTooltip:true
     }
}, {
...
}];

gridView.setColumns(columns);

or

//When set dynamically
gridView.setColumnProperty("KorName","header",{showTooltip:true, tooltip:"Name"})
```

To display a tooltip in the data area, simply set `column.renderer.showTooltip` to true.
The tooltip in the data area displays the original value by default, and uses the onShowTooltip event to display different content.

```js
var columns = [{
     name: "KorName",
     fieldName: "KorName",
     width: "60",
     header: {
       text: "name"
     },
     renderer:{
       showTooltip:true
     }
}, {
...
}];

gridView.setColumns(columns);
```

#### Show Tooltip only for cells in Ellipsis state
Set tooltip to be shown only for cells in Ellipsis state.

```js
const fields = [
  {
    fieldName: "KorName",
    dataType: "text"
  },
  {
    fieldName: "Gender",
    dataType: "text"
  },
  {
    fieldName: "Age",
    dataType: "number"
  },
  {
    fieldName: "Phone",
    dataType: "text"
  },
  {
    fieldName: "ProductId",
    dataType: "text"
  },
  {
    fieldName: "KorCountry",
    dataType: "text"
  },
  {
    fieldName: "OrderDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "CardNumber",
    dataType: "text"
  },
  {
    fieldName: "Monetary",
    dataType: "text"
  },
  {
    fieldName: "StartDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "EndDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "ToMonth",
    dataType: "number"
  },
  {
    fieldName: "Month",
    dataType: "number"
  },
  {
    fieldName: "Year",
    dataType: "number"
  },
  {
    fieldName: "InterestRate",
    dataType: "number"
  },
  {
    fieldName: "SaveCost",
    dataType: "number"
  },
  {
    fieldName: "SaveMaturity",
    dataType: "number"
  },
  {
    fieldName: "CurrentSave",
    dataType: "number"
  }
];

const columns = [
  {
    name: "KorName",
    fieldName: "KorName",
    width: "60",
    header: {
      text: "Name"
    }
  },
  {
    name: "Gender",
    fieldName: "Gender",
    width: "40",
    header: {
      text: "Gender"
    }
  },
  {
    name: "Age",
    fieldName: "Age",
    width: "40",
    header: {
      text: "Age"
    },
    styleName: "right-column"
  },
  {
    name: "Phone",
    fieldName: "Phone",
    width: "100",
    header: {
      text: "Phone"
    }
  },
  {
    name: "ProductId",
    fieldName: "ProductId",
    width: "100",
    styleName: "orange-column",
    header: {
      text: "Product ID"
    }
  },
  {
    name: "KorCountry",
    fieldName: "KorCountry",
    width: "30",
    styleName: "orange-column",
    header: {
      text: "Investment Country",
      styleName: "header"
    }
  },
  {
    name: "OrderDate",
    fieldName: "OrderDate",
    width: "100",
    header: {
      text: "Order Date"
    }
  },
  {
    name: "CardNumber",
    fieldName: "CardNumber",
    width: "140",
    header: {
      text: "Card Number"
    }
  },
  {
    name: "Monetary",
    fieldName: "Monetary",
    width: "40",
    header: {
      text: "Currency"
    }
  },
  {
    name: "StartDate",
    fieldName: "StartDate",
    width: "100",
    header: {
      text: "First Payment Date"
    }
  },
  {
    name: "EndDate",
    fieldName: "EndDate",
    width: "100",
    header: {
      text: "End Date"
    }
  },
  {
    name: "ToMonth",
    fieldName: "ToMonth",
    width: "50",
    header: {
      text: "Payment Count"
    },
    styleName: "right-column"
  },
  {
    name: "Month",
    fieldName: "Month",
    width: "50",
    header: {
      text: "Remaining Count"
    },
    styleName: "right-column"
  },
  {
    name: "InterestRate",
    fieldName: "InterestRate",
    width: "50",
    numberFormat: "0.00",
    header: {
      text: "Interest Rate"
    },
    styleName: "right-column"
  },
  {
    name: "SaveCost",
    fieldName: "SaveCost",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Payment Amount"
    },
    styleName: "right-column"
  },
  {
    name: "SaveMaturity",
    fieldName: "SaveMaturity",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Maturity Amount"
    },
    styleName: "right-column"
  },
  {
    name: "CurrentSave",
    fieldName: "CurrentSave",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Current Balance"
    },
    styleName: "right-column"
  }
];

const { gridView, dataProvider } = RealGrid.createGrid("realgrid", {
  columns,
  header: {
    showTooltip: true,
    tooltipEllipsisOnly: true
  },
  display: {
    rowHeight: 36,
    emptyMessage: "No data to display.",
    showTooltip: true,
    tooltipEllipsisOnly: true
  },
  edit: {
    insertable: true,
    appendable: true
  },
  footer: {
    height: 40
  },
  stateBar: {
    width: 16
  },
  onInitialized: (grid) => {
    fetch('/data/en/simple_data.json')
      .then(response => response.json())
      .then(data => {
        grid.getDataSource().setRows(data);
      });
  }
}, {
  fields
});

window.gridView = gridView;
window.dataProvider = dataProvider;
```

```js

  gridView.displayOptions.showTooltip = true;
  gridView.displayOptions.tooltipEllipsisOnly = true;
  gridView.header.showTooltip = true;
  gridView.header.tooltipEllipsisOnly = true;
  
```

#### onShowTooltip event

The [onShowTooltip](/refs/Class/GridBase#onshowtooltip) event is a callback function that occurs when a tooltip is displayed on the screen.
In this callback function you can change the message displayed in the tooltip.
Check the changed tooltip in the name column.

```js
const fields = [
  {
    fieldName: "KorName",
    dataType: "text"
  },
  {
    fieldName: "Gender",
    dataType: "text"
  },
  {
    fieldName: "Age",
    dataType: "number"
  },
  {
    fieldName: "Phone",
    dataType: "text"
  },
  {
    fieldName: "ProductId",
    dataType: "text"
  },
  {
    fieldName: "KorCountry",
    dataType: "text"
  },
  {
    fieldName: "OrderDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "CardNumber",
    dataType: "text"
  },
  {
    fieldName: "Monetary",
    dataType: "text"
  },
  {
    fieldName: "StartDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "EndDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "ToMonth",
    dataType: "number"
  },
  {
    fieldName: "Month",
    dataType: "number"
  },
  {
    fieldName: "Year",
    dataType: "number"
  },
  {
    fieldName: "InterestRate",
    dataType: "number"
  },
  {
    fieldName: "SaveCost",
    dataType: "number"
  },
  {
    fieldName: "SaveMaturity",
    dataType: "number"
  },
  {
    fieldName: "CurrentSave",
    dataType: "number"
  }
];

const columns = [
  {
    name: "KorName",
    fieldName: "KorName",
    width: "60",
    renderer: {
      showTooltip: true
    },
    styleName: "orange-column",
    header: {
      text: "Name"
    }
  },
  {
    name: "Gender",
    fieldName: "Gender",
    width: "40",
    header: {
      text: "Gender"
    }
  },
  {
    name: "Age",
    fieldName: "Age",
    width: "40",
    header: {
      text: "Age"
    },
    styleName: "right-column"
  },
  {
    name: "Phone",
    fieldName: "Phone",
    width: "100",
    header: {
      text: "Phone"
    }
  },
  {
    name: "ProductId",
    fieldName: "ProductId",
    width: "120",
    header: {
      text: "Product ID"
    }
  },
  {
    name: "KorCountry",
    fieldName: "KorCountry",
    width: "100",
    header: {
      text: "Investment Country"
    }
  },
  {
    name: "OrderDate",
    fieldName: "OrderDate",
    width: "100",
    header: {
      text: "Order Date"
    }
  },
  {
    name: "CardNumber",
    fieldName: "CardNumber",
    width: "140",
    header: {
      text: "Card Number"
    }
  },
  {
    name: "Monetary",
    fieldName: "Monetary",
    width: "40",
    header: {
      text: "Currency"
    }
  },
  {
    name: "StartDate",
    fieldName: "StartDate",
    width: "100",
    header: {
      text: "First Payment Date"
    }
  },
  {
    name: "EndDate",
    fieldName: "EndDate",
    width: "100",
    header: {
      text: "End Date"
    }
  },
  {
    name: "ToMonth",
    fieldName: "ToMonth",
    width: "50",
    header: {
      text: "Payment Count"
    },
    styleName: "right-column"
  },
  {
    name: "Month",
    fieldName: "Month",
    width: "50",
    header: {
      text: "Remaining Count"
    },
    styleName: "right-column"
  },
  {
    name: "InterestRate",
    fieldName: "InterestRate",
    width: "50",
    numberFormat: "0.00",
    header: {
      text: "Interest Rate"
    },
    styleName: "right-column"
  },
  {
    name: "SaveCost",
    fieldName: "SaveCost",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Payment Amount"
    },
    styleName: "right-column"
  },
  {
    name: "SaveMaturity",
    fieldName: "SaveMaturity",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Maturity Amount"
    },
    styleName: "right-column"
  },
  {
    name: "CurrentSave",
    fieldName: "CurrentSave",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Current Balance"
    },
    styleName: "right-column"
  }
];

const { gridView, dataProvider } = RealGrid.createGrid("realgrid", {
  columns,
  header: {
    height: 40
  },
  display: {
    rowHeight: 36,
    emptyMessage: "No data to display."
  },
  edit: {
    insertable: true,
    appendable: true
  },
  footer: {
    height: 40
  },
  stateBar: {
    width: 16
  },
  onInitialized: (grid) => {
    fetch('/data/en/simple_data.json')
      .then(response => response.json())
      .then(data => {
        grid.getDataSource().setRows(data);
      });
    
    grid.onShowTooltip = function(grid, index, value) {
      var column = index.column;
      var itemIndex = index.itemIndex;
    
      var tooltip = value;
      if (column == "KorName") {
        tooltip =
          "Name: " +
          value +
          "\r\nGender: " +
          grid.getValue(itemIndex, "Gender") +
          "\r\nAge:" +
          grid.getValue(itemIndex, "Age")
      }
      return tooltip;
    };
  }
}, {
  fields
});

window.gridView = gridView;
window.dataProvider = dataProvider;
```

```js
gridView.onShowTooltip = function(grid, index, value) {
   var column = index.column;
   var itemIndex = index.itemIndex;

   var tooltip = value;
   if (column == "KorName") {
     tooltip =
       "Name: " +
       value +
       "\r\nGender: " +
       grid.getValue(itemIndex, "Gender") +
       "\r\nAge:" +
       grid.getValue(itemIndex, "Age")
   }
   return tooltip;
};
```

#### RowBar Tooltip

Set tooltips to display in the rowIndicator, checkBar, and stateBar areas.

```js
const fields = [
  {
    fieldName: "KorName",
    dataType: "text"
  },
  {
    fieldName: "Gender",
    dataType: "text"
  },
  {
    fieldName: "Age",
    dataType: "number"
  },
  {
    fieldName: "Phone",
    dataType: "text"
  },
  {
    fieldName: "ProductId",
    dataType: "text"
  },
  {
    fieldName: "KorCountry",
    dataType: "text"
  },
  {
    fieldName: "OrderDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "CardNumber",
    dataType: "text"
  },
  {
    fieldName: "Monetary",
    dataType: "text"
  },
  {
    fieldName: "StartDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "EndDate",
    dataType: "datetime",
    datetimeFormat: "yyyy-MM-dd",
    amText: "AM",
    pmText: "PM"
  },
  {
    fieldName: "ToMonth",
    dataType: "number"
  },
  {
    fieldName: "Month",
    dataType: "number"
  },
  {
    fieldName: "Year",
    dataType: "number"
  },
  {
    fieldName: "InterestRate",
    dataType: "number"
  },
  {
    fieldName: "SaveCost",
    dataType: "number"
  },
  {
    fieldName: "SaveMaturity",
    dataType: "number"
  },
  {
    fieldName: "CurrentSave",
    dataType: "number"
  }
];

const columns = [
  {
    name: "KorName",
    fieldName: "KorName",
    width: "60",
    header: {
      text: "Name"
    },
    renderer: {
      showTooltip: true
    }
  },
  {
    name: "Gender",
    fieldName: "Gender",
    width: "40",
    header: {
      text: "Gender"
    }
  },
  {
    name: "Age",
    fieldName: "Age",
    width: "40",
    header: {
      text: "Age"
    },
    styleName: "right-column"
  },
  {
    name: "Phone",
    fieldName: "Phone",
    width: "100",
    header: {
      text: "Phone"
    }
  },
  {
    name: "ProductId",
    fieldName: "ProductId",
    width: "120",
    header: {
      text: "Product ID"
    }
  },
  {
    name: "KorCountry",
    fieldName: "KorCountry",
    width: "100",
    header: {
      text: "Investment Country"
    }
  },
  {
    name: "OrderDate",
    fieldName: "OrderDate",
    width: "100",
    header: {
      text: "Order Date"
    }
  },
  {
    name: "CardNumber",
    fieldName: "CardNumber",
    width: "140",
    header: {
      text: "Card Number"
    }
  },
  {
    name: "Monetary",
    fieldName: "Monetary",
    width: "40",
    header: {
      text: "Currency"
    }
  },
  {
    name: "StartDate",
    fieldName: "StartDate",
    width: "100",
    header: {
      text: "First Payment Date"
    }
  },
  {
    name: "EndDate",
    fieldName: "EndDate",
    width: "100",
    header: {
      text: "End Date"
    }
  },
  {
    name: "ToMonth",
    fieldName: "ToMonth",
    width: "50",
    header: {
      text: "Payment Count"
    },
    styleName: "right-column"
  },
  {
    name: "Month",
    fieldName: "Month",
    width: "50",
    header: {
      text: "Remaining Count"
    },
    styleName: "right-column"
  },
  {
    name: "InterestRate",
    fieldName: "InterestRate",
    width: "50",
    numberFormat: "0.00",
    header: {
      text: "Interest Rate"
    },
    styleName: "right-column"
  },
  {
    name: "SaveCost",
    fieldName: "SaveCost",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Payment Amount"
    },
    styleName: "right-column"
  },
  {
    name: "SaveMaturity",
    fieldName: "SaveMaturity",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Maturity Amount"
    },
    styleName: "right-column"
  },
  {
    name: "CurrentSave",
    fieldName: "CurrentSave",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Current Balance"
    },
    styleName: "right-column"
  }
];

const { gridView, dataProvider } = RealGrid.createGrid("realgrid", {
  columns,
  header: {
    height: 40
  },
  display: {
    rowHeight: 36,
    emptyMessage: "No data to display."
  },
  edit: {
    insertable: true,
    appendable: true
  },
  footer: {
    height: 40
  },
  stateBar: {
    width: 16
  },
  rowIndicator: {
    showTooltip: true
  },
  checkBar: {
    showTooltip: true
  },
  onInitialized: (grid) => {
    fetch('/data/en/simple_data.json')
      .then(response => response.json())
      .then(data => {
        grid.getDataSource().setRows(data);
      });
    
    grid.rowIndicator.showTooltip = true;
    grid.checkBar.showTooltip = true;
    grid.stateBar.showTooltip = true;
    grid.onShowRowBarTooltip = function(g, type, itemIndex, dataRow) {
      return type + 'Area tooltip.';
    };
  }
}, {
  fields
});

window.gridView = gridView;
window.dataProvider = dataProvider;
```

Set the showTooltip property to true for the required areas, then use the onShowRowBarTooltip event to display the content.

```js
gridView.rowIndicator.showTooltip = true;
gridView.checkBar.showTooltip = true;
gridView.stateBar.showTooltip = true;
gridView.onShowRowBarTooltip = function(grid, type, itemIndex, dataRow){
return type + "Area tooltip."
}
```