External module events

The piweb.events module encapsulates the events with the associated callbacks that are triggered by the PiWeb host application. The callback functions serve as entry points for almost everything that happens in a plot extension, like drawing and data processing.

'use strict';

import * as piweb from 'piweb';

piweb.events.on("load", load);
function load( )
{
    //1. The plot is loaded, e.g. when adding the element to the report.
    piweb.logger.debug(`'load' called`)
}

piweb.events.on("dataChanged", dataChanged);
function dataChanged( )
{
    //2. The data of the databinding has been fetched.
    piweb.logger.debug(`'dataChanged' called`)
}

piweb.events.on("render", render);
function render( context: piweb.drawing.DrawingContext )
{
    //3. The plot is rendered. This happens whenever anything on the page changes.
    piweb.logger.debug(`'render' called`)
}

piweb.events.on("dataBindingChanged", dataBindingChanged);
function dataBindingChanged( )
{
    //4. The databinding was modified. Subsequently, 'dataChanged' and 'render' will be called.
    piweb.logger.debug(`'dataBindingChanged' called`)
}

see

drawing

see

data