[英]Is it possible to dynamically add more Y Axes or more X Axes on chart js?
我已經嘗試了幾天,使用chart js動態地向圖表添加自定義比例。 我正在使用Angular 2和Typescript。
我以兩種不同的方式嘗試過。 第一個觸發錯誤。 第二個有效,但這不是我的目標。 那我在做什么錯?
第一種方法 :我有一個模態,該模態具有一些輸入來設置自定義比例,並且它返回一個對象,該對象看起來像Chart JS文檔中的比例對象:
customScale = {
id: 'y-axis-2',
type: 'linear',
position:'right',
scaleLabel: {
display: true,
labelString: 'scale 3'
},
ticks: {
max: 20,
min: 1
}
}
我有一個函數,應該將該比例添加到附加到我的圖表的比例數組中。
addCustomScale(customScale: any, axis: string) {
const ci = this.chartComponent.chart;
let scale = [];
scale.push(customScale);
if (axis === 'Axis Y') {
ci.options.scales.yAxes = Chart.helpers.scaleMerge(Chart.defaults.scale,{yAxes: scale}).yAxes;
} else {
ci.options.scales.xAxes = Chart.helpers.scaleMerge(Chart.defaults.scale, {xAxes: scale}).xAxes;
}
ci.update();
}
調用此函數時,出現錯誤:
ERROR TypeError: Cannot set property 'options' of undefined
at core.controller.js:51
到目前為止,我的圖表如下所示:
<canvas width="600" height="300" id="canvas" #myCanvas baseChart
[datasets]="lineChartData"
[labels]="lineChartLabels"
[options]="mfChartOptions"
[legend]="lineChartLegend"
[chartType]="lineChartType"></canvas>
我在打字稿中定義了所有內容:
import {BaseChartDirective} from 'ng2-charts';
declare const Chart: any;
@Component({
selector: 'app-chart',
templateUrl: './chart.component.html',
styleUrls: ['./chart.component.css']
})
export class ChartComponent {
@ViewChild(BaseChartDirective) chartComponent: BaseChartDirective;
public lineChartData: Array<any> = [
{data: [65, 59, 80, 81, 56, 55, 40], yAxisID: 'y-axis-0', label: 'Series A'},
{data: [28, 48, 40, 19, 86, 27, 90], yAxisID: 'y-axis-1', label: 'Series B'},
{data: [18, 48, 77, 9, 100, 27, 40], yAxisID: 'y-axis-1', label: 'Series C'}
];
public lineChartLabels: Array<any> = ['January', 'February', 'March', 'April', 'May', 'June', 'July'];
public lineChartLegend = true;
public lineChartType = 'line';
public mfChartOptions = {
responsive: true,
pan: {
enabled: true,
mode: 'xy'
},
zoom: {
enabled: true,
drag: true,
mode: 'xy'
},
legend: {
position: 'bottom',
},
scales: {
yAxes: [{
id: 'y-axis-0',
type: 'linear',
position: 'left',
}, {
id: 'y-axis-1',
type: 'linear',
position: 'right',
ticks: {
max: 100,
min: 0
}
}]
},
annotation: {
events: ['click'],
annotations: []
},
tooltipTemplate: '<%if (label){%><%=label %>: <%}%><%= value + \' %\' %>',
tooltips: {
intersect: true,
bodySpacing: 4
},
plugins: {
filler: {
propagate: true
}
}
};
第二種方法 。 我只是在選項中已經添加的秤上添加了另一個秤,像這樣:
public mfChartOptions = {
responsive: true,
pan: {
enabled: true,
mode: 'xy'
},
zoom: {
enabled: true,
drag: true,
mode: 'xy'
},
scales: {
yAxes: [{
id: 'y-axis-0',
type: 'linear',
position: 'left',
}, {
id: 'y-axis-1',
type: 'linear',
position: 'right',
ticks: {
max: 100,
min: 0
}
}, {
id: 'y-axis-2',
type: 'linear',
position: 'right',
ticks: {
max: 80,
min: 40
}
}]
},
annotation: {
events: ['click'],
annotations: []
},
tooltipTemplate: '<%if (label){%><%=label %>: <%}%><%= value + \' %\' %>',
tooltips: {
intersect: true,
bodySpacing: 4
},
plugins: {
filler: {
propagate: true
}
}
};
並將我的數據集更改為:
public lineChartData: Array<any> = [
{data: [65, 59, 80, 81, 56, 55, 40], yAxisID: 'y-axis-0', label: 'Series A'},
{data: [28, 48, 40, 19, 86, 27, 90], yAxisID: 'y-axis-1', label: 'Series B'},
{data: [18, 48, 77, 9, 100, 27, 40], yAxisID: 'y-axis-2', label: 'Series C'}
];
這一個工作得很好,但我想允許用戶創建自定義比例,而不是對其進行硬編碼。
您可以銷毀圖表並再次運行新的Chart函數。
這是小提琴: https : //jsfiddle.net/cbalakus/fhadc9by/
function addYAxis() {
var leng = window.myLine.options.scales.yAxes.length + 1;
var clr = chartColors[Math.floor(Math.random() * chartColors.length)];
opts.scales.yAxes.push({
type: "linear",
display: true,
position: "right",
id: "y-axis-" + leng,
ticks: {
fontColor: clr
}
});
lineChartData.datasets.push({
label: "y-axis-" + leng,
borderColor: clr,
backgroundColor: clr,
fill: false,
data: getDatas(),
yAxisID: "y-axis-" + leng,
});
window.myLine.destroy();
var ctx = document.getElementById("cvs").getContext("2d");
window.myLine = Chart.Line(ctx, {
data: lineChartData,
options: opts
});
}
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