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. Other indicator topics

9.1 Collecting external data

PreviousOther indicator topicsNext9.2 Converting dates to chart time

Last updated 3 months ago

Your UDI can collect external data, such as an economic calendar or trading signals, and then draw that data on the chart or incorporate it into the output which your indicator calculates.

Like any Javascript in a web browser, your UDI can use (or ).

However, as always, XMLHttpRequest is subject to browser security: your web browser will only let you make a cross-origin call to a remote server if that server permits such a call by setting the headers Access-Control-Allow-Origin and Access-Control-Allow-Credentials on its response.

If you are trying to use a third-party service which is not CORS-compatible then you need a proxy in between your UDI and the third-party server. For example, you cannot request the Forex Factory calendar at directly from browser Javascript, because the Forex Factory page does not set CORS headers.

In addition, Liquid Charts Pro is hosted at an https:// address. Standard browser security will prevent you making any sort of connection to a non-secure http:// address.

XMLHttpRequest
web sockets
CORS
https://cdn-nfs.forexfactory.net/ff_calendar_thisweek.xml