如何设置ChartJS y轴标题 [英] How to set ChartJS y axis title
问题描述
我使用Chartjs来显示图表,我需要设置y轴的标题,但在文档中没有相关信息。
我需要将y轴设置为像图片或y轴的顶部,所以有人现在可以是该参数是什么。
I am using Chartjs for showing diagrams and I need to set title of y axis, but there are no information about it in documentation.
I need y axis to be set like on picture, or on top of y axis so someone could now what is that parameter
http://js.devexpress.com/Content/images/doc/15_1/ChartJS/fullStackedSplineArea.png
I have looked on official website but there was no information about it
You can tweak the options and extend the chart type to do this, like so
Chart.types.Line.extend({
name: "LineAlt",
draw: function () {
Chart.types.Line.prototype.draw.apply(this, arguments);
var ctx = this.chart.ctx;
ctx.save();
// text alignment and color
ctx.textAlign = "center";
ctx.textBaseline = "bottom";
ctx.fillStyle = this.options.scaleFontColor;
// position
var x = this.scale.xScalePaddingLeft * 0.4;
var y = this.chart.height / 2;
// change origin
ctx.translate(x, y)
// rotate text
ctx.rotate(-90 * Math.PI / 180);
ctx.fillText(this.datasets[0].label, 0, 0);
ctx.restore();
}
});
calling it like this
var ctx = document.getElementById("myChart").getContext("2d");
var myLineChart = new Chart(ctx).LineAlt(data, {
// make enough space on the right side of the graph
scaleLabel: " <%=value%>"
});
Notice the space preceding the label value, this gives us space to write the y axis label without messing around with too much of Chart.js internals
Fiddle - http://jsfiddle.net/wyox23ga/
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