chart.js不允许y轴步长为对数刻度 [英] chart.js not allowing y axis steps with logarithmic scale

问题描述

我不得不解析科学表示法，这是对图形执行对数标度的结果，但是它打印出了图形中每一行的每个值。

I had to parse the scientific notation that was a result of implementing logarithmic scale to my graph but it printed out each value for each line in the graph. No method of steps seems to be working.

RESULTING CHART IMG

var packetsElement = $("#packetsGraph");
    pckBarChart = new Chart(packetsElement, {
        type: 'bar',
        data: {
            labels: ["Received", "Errors", "Lost"],
            datasets: [{
                label: '# of Packets',
                data: packetsArr,
                backgroundColor: [
                    'rgba(55,102,245,0.3)',
                    'rgba(55,102,245,0.2)',
                    'rgba(55,102,245,0.1)'
                ],
                borderColor: [
                    '#3766F5',
                    '#3766F5',
                    '#3766F5'],
                borderWidth: 1
            }]
        },
        options: {
            responsive: true,
            maintainAspectRatio: false,
            title: {
                display: true,
                text: 'Packets',
                fontSize: 20
            },
            scales: {
                yAxes: [{
                    type: 'logarithmic',
                    ticks: {
                        min: 1,
                        stepSize: 1000000,
                        steps: 1000000,
                        stepValue: 1000000,
                        callback: function(value, index, values) {
                            return parseFloat(value);
                        }
                    }
                }]
            }
        }
    });

解决方案

I figured it out, here's what I did in case any one else needs it:

var packetsElement = $("#packetsGraph");
    pckBarChart = new Chart(packetsElement, {
        type: 'bar',
        data: {
            labels: ["Received", "Errors", "Lost"],
            datasets: [{
                label: '% of Packets (Logarithmic)',
                data: packetsArr,
                backgroundColor: [
                    'rgba(55,102,245,0.3)',
                    'rgba(55,102,245,0.2)',
                    'rgba(55,102,245,0.1)'
                ],
                borderColor: [
                    '#3766F5',
                    '#3766F5',
                    '#3766F5'],
                borderWidth: 1
            }]
        },
        options: {
            responsive: true,
            maintainAspectRatio: false,
            title: {
                display: true,
                text: 'Packets',
                fontSize: 20
            },
            scales: {
                yAxes: [{
                    type: 'logarithmic',
                    ticks: {
                        min: 0,
                        max: 100,
                        callback: function(value, index, values) {//needed to change the scientific notation results from using logarithmic scale
                            return Number(value.toString());//pass tick values as a string into Number function
                        }
                    },
                    afterBuildTicks: function(pckBarChart) {    
                        pckBarChart.ticks = [];
                        pckBarChart.ticks.push(0);
                        pckBarChart.ticks.push(25);
                        pckBarChart.ticks.push(50);
                        pckBarChart.ticks.push(75);
                        pckBarChart.ticks.push(100);
                      }
                }]
            },
            tooltips: {
                enabled: true,
                mode: 'single',
                callbacks: {
                    label: function(tooltipItems, data) { 
                        return tooltipItems.yLabel + ' %';
                    }
                }
            },
        }
    });

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