BootstrapBlazor组件 Chart 图表介绍

通过给定数据，绘画各种图表的组件

本文主要介绍三种图表使用:折线图,柱状图,饼图

1.新建工程

新建工程b06chart,使用 nuget.org 进行 BootstrapBlazor 组件安装, Chart 库,字体. 将项目添加到解决方案中

dotnet new blazorserver -o b06chartdotnet add b06chart package BootstrapBlazordotnet add b06chart package BootstrapBlazor.FontAwesomedotnet add b06chart package BootstrapBlazor.Chartdotnet sln add b06chart/b06chart.csproj

2.样式表和Javascript 引用

增加主题样式表到 Pages/_Layout.cshtml 文件中

删除 <link rel="stylesheet" href="css/bootstrap/bootstrap.min.css" />

并在下面添加三行

<link href="_content/BootstrapBlazor.FontAwesome/css/font-awesome.min.css" rel="stylesheet" /><link href="_content/BootstrapBlazor/css/bootstrap.blazor.bundle.min.css" rel="stylesheet" /><link href="_content/BootstrapBlazor.Chart/css/bootstrap.blazor.chart.bundle.min.css" rel="stylesheet" />

添加 Javascript 引用到 Pages/_Layout.cshtml 文件中

在 <script src="_framework/blazor.server.js"></script> 之前添加

<script src="_content/BootstrapBlazor/js/bootstrap.blazor.bundle.min.js" asp-append-version="true"></script><script src="_content/BootstrapBlazor.Chart/js/bootstrap.blazor.chart.bundle.min.js" asp-append-version="true"></script>

3.添加增加命名空间引用到_Imports.razor文件中

@using BootstrapBlazor.Components

4.增加 BootstrapBlazorRoot 组件到 App.razor 文件中

<BootstrapBlazorRoot>    <Router AppAssembly="@typeof(App).Assembly">        ...    </Router></BootstrapBlazorRoot>

5.添加BootstrapBlazor服务到Program.cs文件中

在 builder.Services.AddSingleton<WeatherForecastService>(); 后加入

builder.Services.AddBootstrapBlazor();

6.组件参数

7.事件

8.为了快速建立随机数据,我们建立一个工具类UtilityChart.cs

代码来源于bb演示工程

using BootstrapBlazor.Components;namespace b06chart;/// <summary>/// Chart 工具类/// </summary>internal static class UtilityChart{    public static IEnumerable<string> Colors { get; } = new List<string>() { "Red", "Blue", "Green", "Orange", "Yellow", "Tomato", "Pink", "Violet" };    /// <summary>    ///     /// </summary>    /// <param name="chart"></param>    public static Task RandomData(Chart chart) => chart.Update(ChartAction.Update);    /// <summary>    ///     /// </summary>    /// <param name="chart"></param>    /// <param name="dsCount"></param>    public static void AddDataSet(Chart chart, ref int dsCount)    {        if (dsCount < Colors.Count())        {            dsCount++;            _ = chart.Update(ChartAction.AddDataset);        }    }    /// <summary>    ///     /// </summary>    /// <param name="chart"></param>    /// <param name="dsCount"></param>    public static void RemoveDataSet(Chart chart, ref int dsCount)    {        if (dsCount > 1)        {            dsCount--;            _ = chart.Update(ChartAction.RemoveDataset);        }    }    /// <summary>    ///     /// </summary>    /// <param name="chart"></param>    /// <param name="daCount"></param>    public static void AddData(Chart chart, ref int daCount)    {        var limit = chart.ChartType switch        {            ChartType.Line => 14,            ChartType.Bar => 14,            ChartType.Bubble => 14,            _ => Colors.Count()        };        if (daCount < limit)        {            daCount++;            _ = chart.Update(ChartAction.AddData);        }    }    /// <summary>    ///     /// </summary>    /// <param name="chart"></param>    /// <param name="daCount"></param>    public static void RemoveData(Chart chart, ref int daCount)    {        var limit = chart.ChartType switch        {            ChartType.Line => 7,            ChartType.Bar => 7,            ChartType.Bubble => 4,            _ => 2        };        if (daCount > limit)        {            daCount--;            _ = chart.Update(ChartAction.RemoveData);        }    }}

9.折线图

<p>折线图</p><Chart @ref="LineChart" OnInitAsync="() => OnInit(0.4f, false)" Width="50%" /><button class="btn btn-primary" @onclick="e => UtilityChart.RandomData(LineChart)"><i class="fa fa-line-chart"></i><span>随机数据</span></button>@code{    private Random Randomer { get; } = new Random();    private int LineDatasetCount = 2;    private int LineDataCount = 7;    private Chart? LineChart { get; set; }    private Task<ChartDataSource> OnInit(float tension, bool hasNull)    {        var ds = new ChartDataSource();        ds.Options.Title = "Line 折线图";        ds.Options.X.Title = "天数";        ds.Options.Y.Title = "数值";        ds.Labels = Enumerable.Range(1, LineDataCount).Select(i => i.ToString());        for (var index = 0; index < LineDatasetCount; index++)        {            ds.Data.Add(new ChartDataset()            {                Tension = tension,                Label = $"数据集 {index}",                Data = Enumerable.Range(1, LineDataCount).Select((i, index) => (index == 2 && hasNull) ? null! : (object)Randomer.Next(20, 37))            });        }        return Task.FromResult(ds);    }}

10.柱状图

<p>柱状图</p><Chart ChartType="ChartType.Bar" OnInitAsync="() => OnInit(false)" @ref="BarChart" Width="50%" /><button class="btn btn-primary" @onclick="e => UtilityChart.RandomData(BarChart)"><i class="fa fa-bar-chart"></i><span>随机数据</span></button>@code{    private int BarDatasetCount = 2;    private int BarDataCount = 7;      private Chart? BarChart { get; set; }    private Task<ChartDataSource> OnInit(bool stacked)    {        var ds = new ChartDataSource();        ds.Options.Title = "Bar 柱状图";        ds.Options.X.Title = "天数";        ds.Options.Y.Title = "数值";        ds.Options.X.Stacked = stacked;        ds.Options.Y.Stacked = stacked;        ds.Labels = Enumerable.Range(1, BarDataCount).Select(i => i.ToString());        for (var index = 0; index < BarDatasetCount; index++)        {            ds.Data.Add(new ChartDataset()            {                Label = $"数据集 {index}",                Data = Enumerable.Range(1, BarDataCount).Select(i => Randomer.Next(20, 37)).Cast<object>()            });        }        return Task.FromResult(ds);    }}

11.饼图

<p>饼图</p><Chart ChartType="ChartType.Pie" OnInitAsync="@OnInit" @ref="PieChart" Width="50%" /><button class="btn btn-primary" @onclick="e => UtilityChart.RandomData(PieChart)"><i class="fa fa-pie-chart"></i><span>随机数据</span></button>@code{    private int PieDatasetCount = 1;    private int PieDataCount = 5;    private Chart? PieChart { get; set; }    private Task<ChartDataSource> OnInit()    {        var ds = new ChartDataSource();        ds.Options.Title = "Pie 饼图";        ds.Labels = UtilityChart.Colors.Take(PieDataCount);        for (var index = 0; index < PieDatasetCount; index++)        {            ds.Data.Add(new ChartDataset()            {                Label = $"数据集 {index}",                Data = Enumerable.Range(1, PieDataCount).Select(i => Randomer.Next(20, 37)).Cast<object>()            });        }        return Task.FromResult(ds);    }}

12.未完待续 :)

通过简单的步骤,已经可以初步体验图表组件,由于近日事务较多,这篇只是初略的带大家快速入门,体验一下BootstrapBlazor的Chart 图表使用. 下一篇章我们将会对组件进行一些调整,例如添加移除数据集,添加移除数据,X轴Y轴数据改变后如何刷新组件,以及跟数据库结合查询生成图表.

项目源码

[Github] <https://github.com/densen2014/Blazor100>

[Gitee] <https://gitee.com/densen2014/Blazor100>

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