S06: Add chart with advanced annotations #15
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,22 +1,62 @@ | ||
| (async () => { | ||
| const data = await fetch( | ||
| 'https://demo-live-data.highcharts.com/aapl-c.json' | ||
| ).then(response => response.json()); | ||
|
|
||
| const chart = Highcharts.stockChart('container', { | ||
| chart: { | ||
| events: { | ||
| load() { | ||
| const chart = this; | ||
| const addBtn = document.getElementById('add-annotation'); | ||
|
|
||
| addBtn.addEventListener('click', function() { | ||
| const x = chart.xAxis[0].toValue(chart.plotLeft + 10), | ||
| y = chart.yAxis[0].toValue(chart.plotTop + 10); | ||
|
|
||
| chart.addAnnotation({ | ||
| shapes: [{ | ||
| type: 'rect', | ||
| point: { | ||
| xAxis: 0, | ||
| yAxis: 0, | ||
| x, | ||
| y | ||
| }, | ||
| draggable: true, | ||
|
Collaborator
There was a problem hiding this comment. This assignment is not needed, since the default option is set to 'xy': https://api.highcharts.com/highcharts/annotations.draggable |
||
| width: 360, | ||
| height: 60, | ||
| fill: 'red' | ||
| }], | ||
| labels: [{ | ||
| point: { | ||
| xAxis: 0, | ||
| yAxis: 0, | ||
| x, | ||
| y | ||
| }, | ||
| x: 180, | ||
| y: 30, | ||
| shape: 'rect', | ||
| text: Math.trunc(y), | ||
| align: 'center', | ||
|
Collaborator
There was a problem hiding this comment. |
||
| verticalAlign: 'middle' | ||
| }], | ||
| events: { | ||
| drag: function() { | ||
| const label = this.labels[0]; | ||
| const rectY = this.shapes[0].points[0].y; | ||
| label.options.text = Math.trunc(rectY); | ||
| label.redraw(false); | ||
|
Collaborator
There was a problem hiding this comment. This is an interesting option to update the props of the label, as it directly saves the prop into options and later redraws it. There is another way worth mentioning, by simply updating the label using label.update({
text: y
}); |
||
| } | ||
| } | ||
| }); | ||
| }); | ||
| } | ||
| } | ||
| }, | ||
| series: [{ | ||
| data: data | ||
| }] | ||
| }); | ||
| })(); | ||
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Nitpicking here, but you can safely remove the const assignment, since the variable isn't used anywhere later on.