---
id: "E:cAlgo.API.ChartIndicators.IndicatorModified"
kind: "event"
type: "T:cAlgo.API.ChartIndicators"
url: "https://help.ctrader.com/ctrader-algo/references/Chart/Indicators/ChartIndicators/IndicatorModified/"
---

> Documentation index for agents: https://help.ctrader.com/ctrader-algo/llms.txt · machine index: https://help.ctrader.com/ctrader-algo/api.json

# ChartIndicators.IndicatorModified

Member of [ChartIndicators](https://help.ctrader.com/ctrader-algo/references/Chart/Indicators/ChartIndicators/index.md).

## IndicatorModified

Occurs when an indicator attached to a chart is modified.

Environments: Desktop supported · CLI supported · Cloud not supported.

- Cloud: Always empty: Count is 0, Add returns null, Remove returns false, and the events never fire.

C#:

```csharp
event Action<ChartIndicatorModifiedEventArgs> IndicatorModified;
```

Python:

```python
api.ChartIndicators.IndicatorModified += handler  # handler(obj: ChartIndicatorModifiedEventArgs)
```

### Returns

`Action<ChartIndicatorModifiedEventArgs>` — 

### Examples

C#:

```csharp
protected override void OnStart()
{
    ChartIndicators.IndicatorModified += OnIndicatorModified;
}

private void OnIndicatorModified(ChartIndicatorModifiedEventArgs args)
{
    Print("Indicator modified: {0} | Parameters: {1}", args.Indicator.Name, args.Indicator.Parameters.Count);
}
```

Python:

```python
def on_start(self):
    api.ChartIndicators.IndicatorModified += self.on_indicator_modified

def on_indicator_modified(self, args):
    api.Print(f"Indicator modified: {args.Indicator.Name} | Parameters: {args.Indicator.Parameters.Count}")
```