如何在Chart.js上显示数据值 [英] how to display data values on Chart.js

问题描述

我想问一下是否可以使用Chart.js

---

HTML

 < canvas id =myChart1height =300width =500>< / canvas> 
< canvas id =myChart2height =300width =500>< / canvas> 
  

脚本

  var chartData = {
 labels：[January，February，March，April，May，June]，
数据集：[
 {
 fillColor：＃79D1CF，
 strokeColor：＃79D1CF，
数据：[60,80,81,56,55,40] 
} 
] 
}; 
 
 var ctx = document.getElementById（myChart1）。getContext（2d）; 
 var myLine = new Chart（ctx）.Line（chartData，{
 showTooltips：false，
 onAnimationComplete：function（）{
 
 var ctx = this.chart .ctx; 
 ctx.font = this.scale.font; 
 ctx.fillStyle = this.scale.textColor 
 ctx.textAlign =center; 
 ctx.textBaseline = bottom; 
 
 this.datasets.forEach（function（dataset）{
 dataset.points.forEach（function（points）{
 ctx.fillText（points.value， points.x，points.y  -  10）; 
}）; 
}）
} 
}）; 
 
 var ctx = document.getElementById（myChart2）。getContext（2d）; 
 var myBar = new Chart（ctx）.Bar（chartData，{
 showTooltips：false，
 onAnimationComplete：function（）{
 
 var ctx = this.chart .ctx; 
 ctx.font = this.scale.font; 
 ctx.fillStyle = this.scale.textColor 
 ctx.textAlign =center; 
 ctx.textBaseline = bottom; 
 
 this.datasets.forEach（function（dataset）{
 dataset.bars.forEach（function（bar）{
 ctx.fillText（bar.value， bar.x，bar.y  -  5）; 
}）; 
}）
} 
}）; 
  

---

小提琴 - http://jsfiddle.net/uh9vw0ao/

I would like to ask if it's possible using Chart.js to display data values? I want to print the graph.

Thanks for any advice.

解决方案

Late edit: there is an official plugin for Chart.js 2.7.0+ to do this: https://github.com/chartjs/chartjs-plugin-datalabels

Original answer:

You can loop through the points / bars onAnimationComplete and display the values

---

Preview

---

HTML

<canvas id="myChart1" height="300" width="500"></canvas>
<canvas id="myChart2" height="300" width="500"></canvas>

Script

var chartData = {
    labels: ["January", "February", "March", "April", "May", "June"],
    datasets: [
        {
            fillColor: "#79D1CF",
            strokeColor: "#79D1CF",
            data: [60, 80, 81, 56, 55, 40]
        }
    ]
};

var ctx = document.getElementById("myChart1").getContext("2d");
var myLine = new Chart(ctx).Line(chartData, {
    showTooltips: false,
    onAnimationComplete: function () {

        var ctx = this.chart.ctx;
        ctx.font = this.scale.font;
        ctx.fillStyle = this.scale.textColor
        ctx.textAlign = "center";
        ctx.textBaseline = "bottom";

        this.datasets.forEach(function (dataset) {
            dataset.points.forEach(function (points) {
                ctx.fillText(points.value, points.x, points.y - 10);
            });
        })
    }
});

var ctx = document.getElementById("myChart2").getContext("2d");
var myBar = new Chart(ctx).Bar(chartData, {
    showTooltips: false,
    onAnimationComplete: function () {

        var ctx = this.chart.ctx;
        ctx.font = this.scale.font;
        ctx.fillStyle = this.scale.textColor
        ctx.textAlign = "center";
        ctx.textBaseline = "bottom";

        this.datasets.forEach(function (dataset) {
            dataset.bars.forEach(function (bar) {
                ctx.fillText(bar.value, bar.x, bar.y - 5);
            });
        })
    }
});

---

Fiddle - http://jsfiddle.net/uh9vw0ao/

这篇关于如何在Chart.js上显示数据值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！