
# Indicator

The indicator is a vertical area located on the leftmost side of the grid and can be used to display row numbers of data.

#### How to set up indicators

To change the indicator setting, use [setRowIndicator()](/refs/Class/GridBase#setrowindicator).
To check the currently set state, use [getRowIndicator()](/refs/Class/GridBase#getrowindicator).

#### Specifies whether to display the indicator on the screen

- `visible`: Specifies whether the indicator area is displayed on the screen.

```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: "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;

function setIndicatorInvisible() {
  gridView.setRowIndicator({
    visible: false
  });
}

function setIndicatorVisible() {
  gridView.rowIndicator.visible = true;
  gridView.rowIndicator.width = 8;
}
```

```js
gridView.setRowIndicator({
   visible: false
});

gridView.setRowIndicator({
   visible: true
});
```

#### How to change the display value of an indicator (displayValue)

- `none`: Do not display a value.
- `index`: Displays in order starting from 1. (Regardless of sorting, starting from number 1)
- `row`: Displays the unique number of the row. (Display mixed according to sort)
- `reverse`: Displays values in reverse order.

```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: {
      type: "text"
    }
  },
  {
    name: "Gender",
    fieldName: "Gender",
    width: "40",
    header: {
      text: "Gender"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "Age",
    fieldName: "Age",
    width: "40",
    header: {
      text: "Age"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "Phone",
    fieldName: "Phone",
    width: "100",
    header: {
      text: "Phone"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "ProductId",
    fieldName: "ProductId",
    width: "120",
    header: {
      text: "Product ID"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "KorCountry",
    fieldName: "KorCountry",
    width: "100",
    header: {
      text: "Investment Country"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "OrderDate",
    fieldName: "OrderDate",
    width: "100",
    header: {
      text: "Order Date"
    }
  },
  {
    name: "CardNumber",
    fieldName: "CardNumber",
    width: "140",
    header: {
      text: "Card Number"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "Monetary",
    fieldName: "Monetary",
    width: "40",
    header: {
      text: "Currency"
    },
    renderer: {
      type: "text"
    }
  },
  {
    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: "40",
    header: {
      text: "Payment Count"
    }
  },
  {
    name: "Month",
    fieldName: "Month",
    width: "40",
    header: {
      text: "Remaining Count"
    }
  },
  {
    name: "InterestRate",
    fieldName: "InterestRate",
    width: "40",
    numberFormat: "0.00",
    header: {
      text: "Interest Rate"
    }
  },
  {
    name: "SaveCost",
    fieldName: "SaveCost",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Payment Amount"
    }
  },
  {
    name: "SaveMaturity",
    fieldName: "SaveMaturity",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Maturity Amount"
    }
  },
  {
    name: "CurrentSave",
    fieldName: "CurrentSave",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Current Balance"
    }
  }
];

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;

function btnSetDisplayValueNone() {
  gridView.setRowIndicator({
    displayValue: "none"
  });
}

function btnSetDisplayValueIndex() {
  gridView.setRowIndicator({
    displayValue: "index"
  });
}

function btnSetDisplayValueRow() {
  gridView.setRowIndicator({
    displayValue: "row"
  });
}

function btnSetDisplayValueReverse() {
  gridView.setRowIndicator({
    displayValue: "reverse"
  });
}
```

```js
gridView.setRowIndicator({
   displayValue: "none"
});

gridView.setRowIndicator({
   displayValue: "index"
});

gridView.setRowIndicator({
   displayValue: "row"
});

gridView.setRowIndicator({
   displayValue: "row"
});

gridView.setRowIndicator({
   displayValue: "reverse"
});
```

#### Zero Base

By default, the values displayed in the indicator start from 1. If you want this value to start from 0, set the `zeroBase` property to True.

- `zeroBase`: If true, the indicator value starts from 0.

```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"
    },
    mergeRule:{
      criteria: "value"
    }
  },
  {
    name: "Age",
    fieldName: "Age",
    width: "50",
    header: {
      text: "Age",
    }
  },
  {
    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",
      showTooltip: true,
      tooltip: "Investment Country"
    },
    renderer: {
      type: "text",
      showTooltip: true
    }
  },
  {
    name: "OrderDate",
    fieldName: "OrderDate",
    width: "100",
    header: {
      text: "Order Date"
    }
  },
  {
    name: "CardNumber",
    fieldName: "CardNumber",
    width: "140",
    header: {
      text: "Card Number",
      showTooltip: true,
      tooltip: "Card Number"
    },
    renderer: {
      type: "text",
      showTooltip: true
    }
  },
  {
    name: "Monetary",
    fieldName: "Monetary",
    width: "60",
    header: {
      text: "Currency",
      showTooltip: true,
      tooltip: "Currency Unit"
    },
    renderer: {
      type: "text",
      showTooltip: true
    }
  },
  {
    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: "70",
    header: {
      text: "Payment Count"
    }
  },
  {
    name: "Month",
    fieldName: "Month",
    width: "70",
    header: {
      text: "Remaining Count"
    }
  },
  {
    name: "InterestRate",
    fieldName: "InterestRate",
    width: "60",
    numberFormat: "0.00",
    header: {
      text: "Interest Rate"
    }
  },
  {
    name: "SaveCost",
    fieldName: "SaveCost",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Payment Amount"
    }
  },
  {
    name: "SaveMaturity",
    fieldName: "SaveMaturity",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Maturity Amount"
    }
  },
  {
    name: "CurrentSave",
    fieldName: "CurrentSave",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Current Balance"
    }
  }
];

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;

function btnSetZeroBaseTrue() {
  gridView.setRowIndicator({
    zeroBase: true
  });
}

function btnSetZeroBaseFalse() {
  gridView.setRowIndicator({
    zeroBase: false
  });
}
```

```js
gridView.setRowIndicator({
   zeroBase: true
});

gridView.setRowIndicator({
   zeroBase: false
});
```

#### Head/Foot

You can display text in the head and foot areas of the indicator.

- `headText`: Specifies the text to be displayed in the head area.
- `footText`: Specifies the text to be displayed in the foot area.

```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: {
      type: "text"
    }
  },
  {
    name: "Gender",
    fieldName: "Gender",
    width: "40",
    header: {
      text: "Gender"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "Age",
    fieldName: "Age",
    width: "40",
    header: {
      text: "Age"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "Phone",
    fieldName: "Phone",
    width: "100",
    header: {
      text: "Phone"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "ProductId",
    fieldName: "ProductId",
    width: "120",
    header: {
      text: "Product ID"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "KorCountry",
    fieldName: "KorCountry",
    width: "100",
    header: {
      text: "Investment Country"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "OrderDate",
    fieldName: "OrderDate",
    width: "100",
    header: {
      text: "Order Date"
    }
  },
  {
    name: "CardNumber",
    fieldName: "CardNumber",
    width: "140",
    header: {
      text: "Card Number"
    },
    renderer: {
      type: "text"
    }
  },
  {
    name: "Monetary",
    fieldName: "Monetary",
    width: "40",
    header: {
      text: "Currency"
    },
    renderer: {
      type: "text"
    }
  },
  {
    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: "40",
    header: {
      text: "Payment Count"
    }
  },
  {
    name: "Month",
    fieldName: "Month",
    width: "40",
    header: {
      text: "Remaining Count"
    }
  },
  {
    name: "InterestRate",
    fieldName: "InterestRate",
    width: "40",
    numberFormat: "0.00",
    header: {
      text: "Interest Rate"
    }
  },
  {
    name: "SaveCost",
    fieldName: "SaveCost",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Payment Amount"
    }
  },
  {
    name: "SaveMaturity",
    fieldName: "SaveMaturity",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Maturity Amount"
    }
  },
  {
    name: "CurrentSave",
    fieldName: "CurrentSave",
    width: "80",
    numberFormat: "#,##0",
    header: {
      text: "Current Balance"
    }
  }
];

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;

function btnSetText() {
  gridView.setRowIndicator({
    headText: "head",
    footText: "foot",
    headImageUrl: null,
    footImageUrl: null
  });
}
```

#### Show Text

```js
gridView.setRowIndicator({
   headText: "head",
   footText: "foot"
});
```