When attempting to update the Chart using Chart.js, I encountered an error upon calling the push method. The specific error message received is as follows:
ERROR TypeError: Cannot read property 'apply' of undefined
at Object.value (Chart.js:3574)
at ErrorComponent.updateChart (error.component.ts:132)
at ErrorComponent.set timelineChart [as timelineChart] (error.component.ts:38)
at ErrorComponent_Query (error.component.ts:33)
at executeViewQueryFn (core.js:13733)
at refreshView (core.js:12059)
at refreshComponent (core.js:13445)
at refreshChildComponents (core.js:11716)
at refreshView (core.js:12051)
at refreshEmbeddedViews (core.js:13391)
The approach I am currently taking involves creating the chart once the Angular component is initialized and updating it with new data from HTTP requests. Here is the code snippet I have implemented so far:
private static formatData(errorOccurrences: ErrorOccurrence[]): {x:Date,y:number}[] {
if (!Array.isArray(errorOccurrences)) {
console.warn('ErrorOccurrences is not an array');
return;
}
const occurrencesByHour = {};
for (const errorOccurrence of errorOccurrences) {
const occurrenceTimeStampRounded = ErrorComponent.roundDateBy3Hours(new Date(errorOccurrence.timeStamp));
if (occurrencesByHour.hasOwnProperty(occurrenceTimeStampRounded)) {
++occurrencesByHour[ErrorComponent.roundDateBy3Hours(new Date(errorOccurrence.timeStamp))];
} else {
occurrencesByHour[ErrorComponent.roundDateBy3Hours(new Date(errorOccurrence.timeStamp))] = 1;
}
}
const data: {x:Date,y:number}[] = [];
for (const key of Object.keys(occurrencesByHour).map(q => parseInt(q))) {
data.push({x: new Date(key), y: occurrencesByHour[key]})
}
console.log(data);
return data;
}
private updateChart(): void {
if (!this._chart) {
return;
}
const data = ErrorComponent.formatData((this.reportedError as StandardReportedError).standardErrorOccurrences);
for (const dataLine of data) {
console.log(dataLine);
this._chart.data.datasets[0].data.push(dataLine);
}
this._chart.update();
this.isLoadingOccurrences = false;
}
private createChart(element: ElementRef<HTMLCanvasElement>) {
if (this._chart || !element) {
return;
}
const occurrencesByHour = []
let timeStamp = ErrorComponent.roundDateBy3Hours(new Date());
for (let i = 0; i < 24;i++) {
occurrencesByHour.push(new Date(timeStamp - (10800000 * i)));
}
this._chart = new Chart(element.nativeElement, {
type: 'line',
data: {
labels: occurrencesByHour,
datasets: [{
data: {}
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
fill: 'start',
legend: {
display: false
},
scales: {
xAxes: [{
type: 'time',
distribution: 'series'
}],
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
}
This marks my debut question on Stack Overflow, so please forgive any ambiguities in my query.