Liquid Charts API Docs
Liquid Charts Pro Scripts Documentation
Liquid Charts Pro Scripts Documentation
  • Liquid Charts Pro User-Defined Indicators
    • Introduction
      • 1.1 Access to the Liquid Charts scripting framework (UDI vs UDIX)
      • 1.2 Example UDI code
      • 1.3 Adding a UDI to a chart
      • 1.4 Lifecycle
      • 1.5 Alerts
      • 1.6 Indicator-on-indicator
      • 1.7 Technical note: web workers
      • 1.8 Technical note: dates
    • Initialisation: UDI.onInit()
      • 2.1 Return value from UDI.onInit()
      • 2.2 The plots[] array
      • 2.3 The settingsFields[] array
      • 2.4 Context data passed to UDI.onInit()
    • Calculating data: UDI.onCalculate()
      • 3.1 Reading settings fields
      • 3.2 Input data for the UDI
      • 3.3 Updates of the current bar only
      • 3.4 Calculating output data
      • 3.5 Requesting out-of-band updates
      • 3.6 Technical analysis: moving averages, ATR etc
    • Changes to the chart or parameters
      • 4.1 UDI.onContextChange()
      • 4.2 UDI.onParameterChange()
    • Creating drawings, event markers, and bar highlights
      • 5.1 Creating drawings
      • 5.1.1 Drawing properties
      • 5.2 Creating event markers
      • 5.2.1 Click notifications from event markers
      • 5.3 Creating bar highlights
    • Notifying the user
      • 6.1 Creating toast
      • 6.2 Changing the panel background colour
    • Adding HTML to the chart
      • 7.1 Adding HTML
      • 7.2 Positioning the HTML
      • 7.3 Sending messages from the HTML to the UDI
      • 7.4 Sending messages from the UDI to the HTML
    • Recommended trade
      • 8.0 Recommended trade
    • Other indicator topics
      • 9.1 Collecting external data
      • 9.2 Converting dates to chart time
      • 9.3 Multi-timeframe (MTF) indicators
  • Liquid Charts Pro Framework
    • Examples
    • Collections, objects, and properties in the framework
    • Functions in the framework
    • Messages and event handlers
    • Working with candle data
    • Widget HTML and CSS reference
    • Liquid.utils and other helper functions
    • Framework error codes
    • Script contexts
    • Sending mail into Liquid Charts Pro from outside the platform
    • language variables
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  1. Liquid Charts Pro User-Defined Indicators
  2. Introduction

1.4 Lifecycle

The UDI is initialised once, when it is loaded. The UDI.onInit() function is not then called again if there is a change to the chart, such as a switch to a different market or timeframe, nor is it called if there is a change to the user-defined parameters. (This behaviour is different to other platforms such as MT4 and MT5.)

If your UDI needs to react to changes in the choice of market or timeframe (beyond just recalculating all its data, which will happen anyway) then you can watch for these changes by implementing the optional functions UDI.onContextChange() and UDI.onParameterChange()

Previous1.3 Adding a UDI to a chartNext1.5 Alerts

Last updated 3 months ago