Introduction

An automation framework to help you build Blazor component libary easier and faster.

Latest Version

.net6

.net7

✨ Features

• Easy and automation build parameters for component

• Easy to customize and personalize component building

• Easy to build a flexible dynamic component structure

• Easy interoption between code and javascript

• Modular implementation for automation of component building

• Strong extensions and utilities of RenderTreeBuilder

• Other automations...

🌈 Component Definition

• In Button.razor file

@inherits BlazorComponentBase

<button @attributes="AdditionalAttributes">
    @ChildContent
</button>

@code{
    [CssClass("btn")]
    public Button()
    {
    }

    [Parameter][CssClass("active")]public bool Active { get; set; } 
	
	[Parameter][CssClass("btn-")]public Color? Color { get; set; } 

	[Parameter]public RenderFragment? ChildContent { get; set; } 

	[Parameter][HtmlData("tooltip")]public string? Tooltip { get; set; }

	[Parameter][HtmlEvent("onclick")]public EventCallback<ClickEventArgs> OnClick { get; set; } 

    [Parameter][HtmlAttribute]public string? Title { get; set; }
    
    public enum Color
    {
	    Primary,
	    Secondary,
	    [CssClass("info")]Information,
    }
}

• In Button.cs component class for full automation features

[HtmlTag("button")]
[CssClass("btn")]
public class Button : BlazorComponentBase, IHasChildContent, IHasOnClick
{
	[Parameter][CssClass("active")]public bool Active { get; set; } 
	
	[Parameter][CssClass("btn-")]public Color? Color { get; set; } 

	[Parameter]public RenderFragment? ChildContent { get; set; }

	[Parameter][HtmlData("tooltip")]public string? Tooltip { get; set; }

	[Parameter][HtmlEvent("onclick")]public EventCallback<ClickEventArgs> OnClick { get; set; 

    [Parameter][HtmlAttribute]public string? Title { get; set; }
}

public enum Color
{
	Primary,
	Secondary,
	[CssClass("info")]Information,
}

• Use component

<!--razor-->
<Button Color="Color.Primary">Submit</Button>
<!--html-->
<button class="btn btn-primary">Submit</button>

<!--razor-->
<Button Active Tooltip="active button" Color="Color.Information" Title="click me">Active Button</Button>
<!--html-->
<button class="btn btn-info active" data-tooltip="active button" title="click me">Active Button</button>

🔑 Interoption between C# code and JS

• Import modules

//in app.js
export function display(){
 // ...your code
}

[Inject]IJSRuntime JS { get; set; }

var js = await JS.Value.ImportAsync("./app.js");
js.display(); // same as function name

• Evaluate js string

JS.Value.EvaluateAsync(window => {
    window.console.log("log")
});

JS.Value.EvaludateAsync(@"
    console.log(\"log\");
")

ℹ️ Logical CSS/Style/Attributes

• Logical CSS

protected override void BuildCssClass(ICssClassBuilder builder)
{
    if(builder.Contains("annotation-enter"))
    {
        builder.Remove("annotation-exist");
    }
    else
    {
        builder.Append("annotation-enter").Append("annotation-exist");
    }
}

• Logical Attributes

protected override void BuildAttributes(IDictionary<string, object> attributes)
{
    attributes["onclick"] = HtmlHelper.Event.Create(this, ()=>{ ... });
    
    if(attrbutes.ContainKey("data-toggle"))
    {
        attributes["data-toggle"] = "collapse";
    }
}

🌴 RenderTreeBuilder Extensions

• Create Element

protected override void BuildRenderTree(RenderTreeBuilder builder)
{
    builder.Open("div")
            .Class("my-class", (IsActive, "active"), (!string.IsNullOrEmpty(Name), "text-block"))
            .Style((Size.HasValue, $"font-size:{Size}px"))
            .Content("hello world")
           .Close();

    builder.CreateElement(10, "span", "hello", attributes: new { @class = "title-span"});

}

• Create Component

protected override void BuildRenderTree(RenderTreeBuilder builder)
{
    builder.Open<Button>()
            .Class("my-class", (IsActive, "active"), (!string.IsNullOrEmpty(Name), "text-block"))
            .Style((Size.HasValue, $"font-size:{Size}px"))
            .Content(ChildContent)
           .Close();

    builder.CreateComponent<NavLink>(0, "Home", new { NavLinkMatch = NavLinkMatch.All, ActiveCssClass = "nav-active" })
}

🚸 Component Association

In .razor file

• For List.razor file be parent component

<ul @attributes="AdditionalAttributes">
    <CascadingValue Value="this">
        @ChildContent
    </CascadingValue>
</ul>

• For ListItem.razor file be child of List.razor component

<li @attributes="AdditionalAttributes">@ChildContent</li>

@code{
    [ChildComponent(typeof(List))]
    public ListItem()
    {
    }

    [CascadingParameter] public List CascadedList { get; set; }

    [Parameter] public RenderFragment? ChildContent { get; set; }
}

In RenderTreeBuilder

• For List component class

[ParentComponent] //be cascading parameter for this component
[HtmlTag("ul")]
public class List : BlazorComponentBase, IHasChildContent
{

}

• For ListItem component class

[ChildComponent(typeof(List))] //Strong association with List
[HtmlTag("li")]
public class ListItem : BlazorComponentBase, IHasChildContent
{
    [CascadingParameter]public List CascadedList { get; set; }

    [Parameter] public RenderFragment? ChildContent { get; set; }
}

Use in blazor

<List>
    <ListItem>...</ListItem>
</List>

<ListItem /> <!--throw exception because ListItem must be the child component of List coponent witch defined ChildComponentAttribute in ListItem-->

🔯 HtmlHelper

• in .razor file

<div class="@GetCssClass">
...
</div>

@code{
    string GetCssClass => HtmlHelper.Class.Append("btn-primary").Append("active", Actived).ToString();
}

• Dynamic element attribute

builder.CreateElement(0, "span", attributes: 
    new { 
            @class = HtmlHelper.Class
                                .Append("btn-primary")
                                .Append("active", Actived),
            style = HtmlHelper.Style.Append($"width:{Width}px"),
            onclick = HtmlHelper.Event.Create<MouseEventArgs>(this, e=>{ //...click... });
        });

⚔️ Interceptors

You can intercept the lifecycle of component

• Define an interceptor

public class LogInterceptor : ComponentInterceptorBase
{
    private readonly ILogger<LogInterceptor> _logger;
    public LogInterceptor(ILogger<LogInterceptor> logger)
    {
        _logger = logger;
    }

    //Run in SetParameterAsync method is called
    public override void InterceptSetParameters(IBlazorComponent component, ParameterView parameters)
    {
        foreach(var item in parameters)
        {
            _logger.LogDebug($"Key:{item.Name}, Value:{item.Value}");
        }
    }
}

• Register interceptor

builder.Services.AddComponentBuilder(configure => {
    configure.Interceptors.Add(new LogInterceptor());
})

📘 Installation Guide

• Install from Nuget.org

Install-Package ComponentBuilder

• Register service

builder.Services.AddComponentBuilder();

📝 Component Library Solution Template

Use ComponentBuilder.Templates to generate a razor component library solution and online demo site

dotnet new install ComponentBuilder.Templates
dotnet new blazor-sln -n {YourRazorLibraryName}