Candle Chart

Type: candle_chart • Category: visualization

Description

Store OHLC candlestick data for chart widget

Parameters

Name	Type	Description	Required	Default
widgetId	hidden		no
rowsExpr	string	Expr -> list[dict] (each dict: ts, o, h, l, c)	no
columns	array	Optional list of columns (ts, o, h, l, c)	no
open	string		no
close	string		no
high	string		no
low	string		no
volume	string		no
timestamp	string		no
limit	number		no	500

Help

Candle Chart Worker - Financial Price Visualization

Create candlestick charts for OHLC (Open, High, Low, Close) financial data with volume support.

Data Sources:

• rowsExpr: Expression returning list[dict] with OHLC data
• Field mapping: Specify which fields contain O, H, L, C, Volume, Timestamp
• limit: Maximum candlesticks to display (default: 500)

Required Fields:

• timestamp: Time period for each candle
• open: Opening price
• high: Highest price in period
• low: Lowest price in period
• close: Closing price

Optional Fields:

• volume: Trading volume (displayed as bars below chart)

Features:

• Color coding: Green (bullish: close > open), Red (bearish: close < open)
• Volume bars: Optional volume visualization
• Interactive: Zoom, pan, crosshair, tooltips
• Time-based: Proper time axis formatting
• Auto-detection: Field names auto-detected from data

Data Format: Each row represents one time period:

{
  "timestamp": 1640995200000,
  "open": 100.50,
  "high": 105.25,
  "low": 99.75,
  "close": 104.80,
  "volume": 1000000
}

Examples:

• Stock prices: Map OHLC fields from market data
• Crypto prices: Use exchange API data
• Forex rates: Currency pair price movements

Use Cases:

• Stock market analysis
• Cryptocurrency tracking
• Forex price visualization
• Technical analysis