Enterprise-level component library based on Bootstrap and Blazor
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SignaturePad

Precautions :

This component relies on BootstrapBlazor.SignaturePad, which needs to reference its component package when using this component

Nuget package installation

Install the components of BootstrapBlazor.SignaturePad using nuget.org

.NET CLI
dotnet add package BootstrapBlazor.SignaturePad
PackageReference
<PackageReference Include="BootstrapBlazor.SignaturePad" />
Package Manager
Install-Package BootstrapBlazor.SignaturePad

Signature with touch or mouse

Demo
<SignaturePad OnResult="OnResult" />
signature

Set button css

Demo
<SignaturePad OnResult="OnResult" BtnCssClass="btn btn-outline-success" />
signature

Custom button text

Demo
<SignaturePad OnResult="OnResult" SignAboveLabel="Sign above" UndoBtnTitle="Undo" SaveBase64BtnTitle="OK" ChangeColorBtnTitle="Change color" ClearBtnTitle="Clear" />

When device width is less than 640px (such as mobile phones) automatically topless without borders, the width is less than 500px the button is automatically rotated. Optional transparent background.

Demo

Attributes

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@page "/signaturepads"
@namespace BootstrapBlazor.Shared.Samples
@inject IStringLocalizer<SignaturePads> Localizer

<h3>SignaturePad</h3>

<p><b>Precautions :</b></p>

<p>This component relies on <a href='https://www.nuget.org/packages?q-BootstrapBlazor.SignaturePad' target'_blank'><code>BootstrapBlazor.SignaturePad</code></a>, which needs to reference its component package when using this component</p>

<p><b>Nuget package installation</b></p>

<p>Install the</code> components of <code>BootstrapBlazor.SignaturePad using <a href='https://www.nuget.org/packages?q-BootstrapBlazor.SignaturePad' target'_blank'>nuget.org</a></p>

<div class="code-label">.NET CLI</div>
<Pre class="no-highlight">dotnet add package BootstrapBlazor.SignaturePad</Pre>

<div class="code-label">PackageReference</div>
<Pre class="no-highlight"><PackageReference Include="BootstrapBlazor.SignaturePad" /></Pre>

<div class="code-label">Package Manager</div>
<Pre class="no-highlight">Install-Package BootstrapBlazor.SignaturePad</Pre>

<DemoBlock Title="Basic usage" Introduction="Signature with touch or mouse" Name="Normal">
    <Pre><SignaturePad OnResult="OnResult" /></Pre>
    <div class="row">
        <div class="col-12 col-sm-6">
            <div class="form-label">signature</div>
            <SignaturePad OnResult="OnResult" />
        </div>
        <div class="col-12 col-sm-6">
            @if (Result != null)
            {
                <div class="form-label">Your signature</div>
                <img src="@Result" style="height: 240px; width: auto;" />
                <div class="form-label">Your signature in base64</div>
                <textarea class="form-control" rows="4" @bind="Result" />
            }
        </div>
    </div>
</DemoBlock>

<DemoBlock Title="Button CSS style" Introduction="Set button css" Name="ButtonCssStyle">
    <Pre><SignaturePad OnResult="OnResult" BtnCssClass="btn btn-outline-success" /></Pre>
    <div class="form-label">signature</div>
    <SignaturePad OnResult="OnResult2" BtnCssClass="btn btn-outline-success" />
</DemoBlock>

<DemoBlock Title="Custom button text" Introduction="Custom button text" Name="CustomButton">
    <Pre><SignaturePad OnResult="OnResult" SignAboveLabel="Sign above" UndoBtnTitle="Undo" SaveBase64BtnTitle="OK" ChangeColorBtnTitle="Change color" ClearBtnTitle="Clear" /></Pre>
    <SignaturePad OnResult="OnResult3" SignAboveLabel="Sign above" UndoBtnTitle="Undo" SaveBase64BtnTitle="OK" ChangeColorBtnTitle="Change color" ClearBtnTitle="Clear" />
</DemoBlock>

<DemoBlock Title="Responsive signature interface" Introduction="When device width is less than 640px (such as mobile phones) automatically topless without borders, the width is less than 500px the button is automatically rotated. Optional transparent background." Name="ResponsiveInterface">
    <a class="btn btn-primary" type="button" href="signaturepadResponsive">Responsive signature interface</a>
</DemoBlock>

<Tips>
    <p>Complex signatures will cause a large amount of data to be transmitted, and ssr will show a reload error. The configuration changes the maximum size of a single incoming hub message (default 32KB) to solve this problem. <code> builder.Services.AddServerSideBlazor().AddHubOptions(o => o.MaximumReceiveMessageSize = null); </code> </p>
</Tips>

<AttributeTable Items="@GetAttributes()" />
// Copyright (c) Argo Zhang (argo@163.com). All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
// Website: https://www.blazor.zone or https://argozhang.github.io/

using BootstrapBlazor.Shared.Common;

namespace BootstrapBlazor.Shared.Samples;

/// <summary>
/// 签名演示
/// </summary>
public partial class SignaturePads
{
    /// <summary>
    /// 签名Base64
    /// </summary>
    public string? Result { get; set; }

    /// <summary>
    /// 签名Base64
    /// </summary>
    public string? Result2 { get; set; }

    /// <summary>
    /// 签名Base64
    /// </summary>
    public string? Result3 { get; set; }

    private Task OnResult(string result)
    {
        Result = result;
        StateHasChanged();
        return Task.CompletedTask;
    }

    private Task OnResult2(string result)
    {
        Result2 = result;
        StateHasChanged();
        return Task.CompletedTask;
    }

    private Task OnResult3(string result)
    {
        Result3 = result;
        StateHasChanged();
        return Task.CompletedTask;
    }

    /// <summary>
    /// 获得属性方法
    /// </summary>
    /// <returns></returns>
    private static IEnumerable<AttributeItem> GetAttributes() => new AttributeItem[]
    {
        // TODO: 移动到数据库中
        new AttributeItem()
        {
            Name = "OnResult",
            Description = "签名结果回调方法",
            Type = "Func<string, Task>?",
            ValueList = " — ",
            DefaultValue = " — "
        },
        new AttributeItem()
        {
            Name = "OnAlert",
            Description = "手写签名警告信息回调",
            Type = "Func<string, Task>?",
            ValueList = " — ",
            DefaultValue = " — "
        },
        new AttributeItem()
        {
            Name = "OnError",
            Description = "错误回调方法",
            Type = "Func<string, Task>?",
            ValueList = " — ",
            DefaultValue = " — "
        },
        new AttributeItem()
        {
            Name = "OnClose",
            Description = "手写签名关闭信息回调",
            Type = "Func<Task>?",
            ValueList = " — ",
            DefaultValue = " — "
        },
        new AttributeItem()
        {
            Name = "SignAboveLabel",
            Description = "在框内签名标签文本",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "在框内签名"
        },
        new AttributeItem()
        {
            Name = "ClearBtnTitle",
            Description = "清除按钮文本",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "清除"
        },
        new AttributeItem()
        {
            Name = "SignatureAlertText",
            Description = "请先签名提示文本",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "请先签名"
        },
        new AttributeItem()
        {
            Name = "ChangeColorBtnTitle",
            Description = "换颜色按钮文本",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "换颜色"
        },
        new AttributeItem()
        {
            Name = "UndoBtnTitle",
            Description = "撤消按钮文本",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "撤消"
        },
        new AttributeItem()
        {
            Name = "SaveBase64BtnTitle",
            Description = "保存为 base64 按钮文本",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "确定"
        },
        new AttributeItem()
        {
            Name = "SavePNGBtnTitle",
            Description = "保存为 PNG 按钮文本",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "PNG"
        },
        new AttributeItem()
        {
            Name = "SaveJPGBtnTitle",
            Description = "保存为 JPG 按钮文本",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "JPG"
        },
        new AttributeItem()
        {
            Name = "SaveSVGBtnTitle",
            Description = "保存为 SVG 按钮文本",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "SVG"
        },
        new AttributeItem()
        {
            Name = "EnableChangeColorBtn",
            Description = "启用换颜色按钮",
            Type = "bool",
            ValueList = " — ",
            DefaultValue = "true"
        },
        new AttributeItem()
        {
            Name = "EnableAlertJS",
            Description = "启用 JS 错误弹窗",
            Type = "bool",
            ValueList = " — ",
            DefaultValue = "true"
        },
        new AttributeItem()
        {
            Name = "EnableSaveBase64Btn",
            Description = "启用保存为 base64",
            Type = "bool",
            ValueList = " — ",
            DefaultValue = "true"
        },
        new AttributeItem()
        {
            Name = "EnableSavePNGBtn",
            Description = "启用保存为 PNG",
            Type = "bool",
            ValueList = " — ",
            DefaultValue = "false"
        },
        new AttributeItem()
        {
            Name = "EnableSaveJPGBtn",
            Description = "启用保存为 JPG",
            Type = "bool",
            ValueList = " — ",
            DefaultValue = "false"
        },
        new AttributeItem()
        {
            Name = "EnableAlertJS",
            Description = "启用保存为 SVG",
            Type = "bool",
            ValueList = " — ",
            DefaultValue = "false"
        },
        new AttributeItem()
        {
            Name = "CssClass",
            Description = "组件 CSS 式样",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "signature-pad-body"
        },
        new AttributeItem()
        {
            Name = "BtnCssClass",
            Description = "按钮 CSS 式样",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "btn btn-light"
        },
        new AttributeItem()
        {
            Name = "Responsive",
            Description = "启用响应式 css 界面",
            Type = "bool",
            ValueList = " — ",
            DefaultValue = "false"
        },
        new AttributeItem()
        {
            Name = "BackgroundColor",
            Description = "组件背景,设置 rgba(0,0,0,0)为透明",
            Type = "string",
            ValueList = " — ",
            DefaultValue = "rgb(255, 255, 255)"
        }
    };
}

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Themes
Bootstrap
Motronic
Ant Design (完善中)
LayUI (完善中)
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