BootstrapBlazor元件 Chart 圖表介紹
通過給定資料,繪畫各種圖表的元件
本文主要介紹三種圖表使用:折線圖,柱狀圖,餅圖
1.新建工程
新建工程b06chart,使用 nuget.org 進行 BootstrapBlazor 元件安裝, Chart 庫,字型. 將專案新增到解決方案中
dotnet new blazorserver -o b06chart
dotnet add b06chart package BootstrapBlazor
dotnet add b06chart package BootstrapBlazor.FontAwesome
dotnet add b06chart package BootstrapBlazor.Chart
dotnet sln add b06chart/b06chart.csproj
2.樣式表和Javascript 引用
增加主題樣式表到 Pages/_Layout.cshtml
檔案中
刪除 <link rel="stylesheet" href="css/bootstrap/bootstrap.min.css" />
並在下面新增三行
<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" />
新增 Javascript 引用到 Pages/_Layout.cshtml
檔案中
在 <script src="_framework/blazor.server.js"></script>
之前新增
<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.新增增加名稱空間引用到 _Imports.razor
檔案中
@using BootstrapBlazor.Components
4.增加 BootstrapBlazorRoot 元件到 App.razor 檔案中
<BootstrapBlazorRoot>
<Router AppAssembly="@typeof(App).Assembly">
...
</Router>
</BootstrapBlazorRoot>
5.新增BootstrapBlazor服務到 Program.cs
檔案中
在 builder.Services.AddSingleton<WeatherForecastService>();
後加入
builder.Services.AddBootstrapBlazor();
6.元件引數
引數 | 說明 | 可選值 | 預設值 |
---|---|---|---|
Width | 元件寬度支援單位 如: 100px 75% | ||
ChartType | 圖表型別 | Line/Bar/Pie/Doughnut/Bubble | Line |
7.事件
引數 | 說明 | 型別 |
---|---|---|
OnInitAsync | 元件資料初始化委託方法 | Func<Task |
OnAfterInitAsync | 客戶端繪製圖表完畢後回撥此委託方法 | Func |
OnAfterUpdateAsync | 客戶端更新圖表完畢後回撥此委託方法 | Func<ChartAction, Task> |
8.為了快速建立隨機資料,我們建立一個工具類 UtilityChart.cs
程式碼來源於bb演示工程
using BootstrapBlazor.Components;
namespace b06chart;
/// <summary>
/// Chart 工具類
/// </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.折線圖
<p>折線圖</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>隨機資料</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 折線圖";
ds.Options.X.Title = "天數";
ds.Options.Y.Title = "數值";
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 = $"資料集 {index}",
Data = Enumerable.Range(1, LineDataCount).Select((i, index) => (index == 2 && hasNull) ? null! : (object)Randomer.Next(20, 37))
});
}
return Task.FromResult(ds);
}
}
10.柱狀圖
<p>柱狀圖</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>隨機資料</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 柱狀圖";
ds.Options.X.Title = "天數";
ds.Options.Y.Title = "數值";
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 = $"資料集 {index}",
Data = Enumerable.Range(1, BarDataCount).Select(i => Randomer.Next(20, 37)).Cast<object>()
});
}
return Task.FromResult(ds);
}
}
11.餅圖
<p>餅圖</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>隨機資料</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 餅圖";
ds.Labels = UtilityChart.Colors.Take(PieDataCount);
for (var index = 0; index < PieDatasetCount; index++)
{
ds.Data.Add(new ChartDataset()
{
Label = $"資料集 {index}",
Data = Enumerable.Range(1, PieDataCount).Select(i => Randomer.Next(20, 37)).Cast<object>()
});
}
return Task.FromResult(ds);
}
}
12.未完待續 ?
通過簡單的步驟,已經可以初步體驗圖表元件,由於近日事務較多,這篇只是初略的帶大家快速入門,體驗一下BootstrapBlazor的Chart 圖表使用. 下一篇章我們將會對元件進行一些調整,例如新增移除資料集,新增移除資料,X軸Y軸資料改變後如何重新整理元件,以及跟資料庫結合查詢生成圖表.
專案原始碼
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