"Sorry, there was an issue with AmStockCharts when trying to update the chart: Unable to assign a value to the '

Currently, I am using Angular 4.3.6 along with TypeScript 2.4.2 for my project. The issue that I am facing involves reading data from a socket and attempting to add it to the dataprovider.

I came across an example at:

While implementing a serial chart, queueing the data changes worked perfectly. However, when transitioning to a stock chart, an error occurred as follows:

ERROR TypeError: Cannot set property 'dataContext' of undefined
    at b.parseStockData (amstock.js:formatted:232)
    at b.updateData (amstock.js:formatted:145)
    at b.afterWrite (amstock.js:formatted:91)
    at b.write (amstock.js:formatted:52)
    at b.validateNow (amstock.js:formatted:1143)
    at index.js:335
    at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:392)
    at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.run (zone.js:142)
    at NgZone.webpackJsonp.../../../core/@angular/core.es5.js.NgZone.runOutsideAngular (core.es5.js:3844)
    at AmChartsService.webpackJsonp.../../../../@amcharts/amcharts3-angular/es2015/index.js.AmChartsService.updateChart (index.js:333)

The error specifically occurs in the updateChart function while parsing stock data. Here is the relevant section of my code where the issue arises:

[Your modified code here]
angulartypescriptamcharts

Answer №1

After extensive troubleshooting, I uncovered the root cause of the issue. By making a simple adjustment to the property dataSets within the makeOptions function, specifically updating it to:

"dataSets": [{
            "title": "first data set",
            "fieldMappings": [{
                "fromField": "bvp",
                "toField": "bvp"
            }, {
                "fromField": "gsr",
                "toField": "gsr"
            }],
            "dataProvider": this.chartData,
            "categoryField": "date"
        }]

This modification successfully resolved the problem at hand. It appears that the stock chart functionality necessitates the use of fieldMappings for proper operation.

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