C# 使用JavaScript设置或验证 PDF中的文本域格式

概述

PDF中的文本域可以通过设置不同格式，用于显示数字、货币、日期、时间、邮政编码、电话号码和社保号等等。Adobe Acrobat提供了许多固定的JavaScripts用来设置和验证文本域的格式，如：AFNumber_Format(2, 0, 0, 0, "$", true)和AFNumber_Keystroke(2, 0, 0, 0, "$", true)。Format后缀的script是用来设置文本域显示的格式，而Keystroke后缀的script是用来验证输入内容。

Spire.PDF for .NET提供了相应的方法来设置和验证文本域格式。下面的表格罗列了常用的格式和Spire.PDF中对应的方法，可参考使用

引入dll

1.通过NuGet安装dll（2种方法）

  1.1 可以在Visual Studio中打开“解决方案资源管理器”，鼠标右键点击“引用”，“管理NuGet包”，然后搜索“Spire.PDF”，点击“安装”。

  1.2 将以下内容复制到PM控制台安装。

       Install-Package Spire.PDF -Version 7.12.1

2.手动添加dll引用

可通过手动下载包，然后解压，找到BIN文件夹下的Spire.Pdf.dll。在Visual Studio中打开“解决方案资源管理器”，鼠标右键点击“引用”，“添加引用”将本地路径BIN文件夹下的dll文件添加引用至程序。

代码（C#/VB.NET）

C#

using Spire.Pdf;

using Spire.Pdf.Actions;

using Spire.Pdf.Fields;

using System.Drawing;

namespace SetTextFormatInTextboxField

{

    class Program

    {

        static void Main(string[] args)

        {

            //新建PDF文档,并添加空白页

            PdfDocument pdf = new PdfDocument();

            PdfPageBase page = pdf.Pages.Add();

            //定义坐标变量

            float X = 10;

            float Y = 10;

            float width = 100;

            float height = 20;

            //实例化一个文本域对象，并设置它的位置和边框样式

            PdfTextBoxField textbox = new PdfTextBoxField(page, "Number-TextBox");          

            textbox.Bounds = new RectangleF(X, Y, width, height);

            textbox.BorderWidth = 0.75f;

            textbox.BorderStyle = PdfBorderStyle.Solid;

            //给文本域的键盘击键事件设置一个JavaScript动作用于验证输入内容是否符合要求

            string js = PdfJavaScript.GetNumberKeystrokeString(2, 0, 0, 0, "$", true);

            PdfJavaScriptAction jsAction = new PdfJavaScriptAction(js);

            textbox.Actions.KeyPressed = jsAction;

            //设置文本域内容显示为数字货币

            js = PdfJavaScript.GetNumberFormatString(2, 0, 0, 0, "$", true);

            jsAction = new PdfJavaScriptAction(js);

            textbox.Actions.Format = jsAction;

            //添加文本域到PDF中,并保存文档

            pdf.Form.Fields.Add(textbox);

            //添加文本框，设置文本内容显示为日期格式

            PdfTextBoxField textbox1 = new PdfTextBoxField(page, "DateFormat-TextBox");

            textbox1.Bounds = new RectangleF(X+200, Y, width, height);

            textbox1.BorderWidth = 0.75f;

            textbox1.BorderStyle = PdfBorderStyle.Solid;

            string js1 = PdfJavaScript.GetDateKeystrokeString("mm/dd/yyyy");

            PdfJavaScriptAction jsAction1 = new PdfJavaScriptAction(js1);

            textbox1.Actions.KeyPressed = jsAction1;

            js1 = PdfJavaScript.GetDateFormatString("mm/dd/yyyy");

            jsAction1 = new PdfJavaScriptAction(js1);

            textbox1.Actions.Format = jsAction1;

            pdf.Form.Fields.Add(textbox1);

            //添加文本框，设置文本内容显示为邮政编码格式

            PdfTextBoxField textbox2 = new PdfTextBoxField(page, "SpecialFormat0-1-TextBox");

            textbox2.Bounds = new RectangleF(X + 400, Y, width, height);

            textbox2.BorderWidth = 0.75f;

            textbox2.BorderStyle = PdfBorderStyle.Solid;

            //string js2 = PdfJavaScript.GetSpecialKeystrokeString(0);

            string js2 = PdfJavaScript.GetSpecialKeystrokeString(1);

            PdfJavaScriptAction jsAction2 = new PdfJavaScriptAction(js2);

            textbox2.Actions.KeyPressed = jsAction2;

            //js2 = PdfJavaScript.GetSpecialFormatString(0);

            js2 = PdfJavaScript.GetSpecialFormatString(1);

            jsAction2 = new PdfJavaScriptAction(js2);

            textbox2.Actions.Format = jsAction2;

            pdf.Form.Fields.Add(textbox2);

            //添加文本框，设置文本内容显示为百分数

            PdfTextBoxField textbox3 = new PdfTextBoxField(page, "SpecialFormat2-TextBox");

            textbox3.Bounds = new RectangleF(X, Y+50, width, height);

            textbox3.BorderWidth = 0.75f;

            textbox3.BorderStyle = PdfBorderStyle.Solid;

            string js3 = PdfJavaScript.GetPercentKeystrokeString(1,0);

            PdfJavaScriptAction jsAction3 = new PdfJavaScriptAction(js3);

            textbox3.Actions.KeyPressed = jsAction3;

            js3 = PdfJavaScript.GetPercentFormatString(1, 0);

            jsAction3 = new PdfJavaScriptAction(js3);

            textbox3.Actions.Format = jsAction3;

            pdf.Form.Fields.Add(textbox3);

            //添加文本框，设置数据验证

            PdfTextBoxField textbox4 = new PdfTextBoxField(page, "RangeValidate-TextBox");

            textbox4.Bounds = new RectangleF(X+200, Y + 50, width, height);

            textbox4.BorderWidth = 0.75f;

            textbox4.BorderStyle = PdfBorderStyle.Solid;

            string js4 = PdfJavaScript.GetRangeValidateString(true, -18, true, 18);

            PdfJavaScriptAction jsAction4 = new PdfJavaScriptAction(js4);

            textbox4.Actions.Format = jsAction4;

            pdf.Form.Fields.Add(textbox4);

            //保存文档

            pdf.SaveToFile("FormatField.pdf", FileFormat.PDF);

        }

    }

}

VB.NET

Imports Spire.Pdf

Imports Spire.Pdf.Actions

Imports Spire.Pdf.Fields

Imports System.Drawing

Namespace SetTextFormatInTextboxField

    Class Program

        Private Shared Sub Main(args As String())

            '新建PDF文档,并添加空白页

            Dim pdf As New PdfDocument()

            Dim page As PdfPageBase = pdf.Pages.Add()

            '定义坐标变量

            Dim X As Single = 10

            Dim Y As Single = 10

            Dim width As Single = 100

            Dim height As Single = 20

            '实例化一个文本域对象，并设置它的位置和边框样式

            Dim textbox As New PdfTextBoxField(page, "Number-TextBox")

            textbox.Bounds = New RectangleF(X, Y, width, height)

            textbox.BorderWidth = 0.75F

            textbox.BorderStyle = PdfBorderStyle.Solid

            '给文本域的键盘击键事件设置一个JavaScript动作用于验证输入内容是否符合要求

            Dim js As String = PdfJavaScript.GetNumberKeystrokeString(2, 0, 0, 0, "$", True)

            Dim jsAction As New PdfJavaScriptAction(js)

            textbox.Actions.KeyPressed = jsAction

            '设置文本域内容显示为数字货币

            js = PdfJavaScript.GetNumberFormatString(2, 0, 0, 0, "$", True)

            jsAction = New PdfJavaScriptAction(js)

            textbox.Actions.Format = jsAction

            '添加文本域到PDF中,并保存文档

            pdf.Form.Fields.Add(textbox)

            '添加文本框，设置文本内容显示为日期格式

            Dim textbox1 As New PdfTextBoxField(page, "DateFormat-TextBox")

            textbox1.Bounds = New RectangleF(X + 200, Y, width, height)

            textbox1.BorderWidth = 0.75F

            textbox1.BorderStyle = PdfBorderStyle.Solid

            Dim js1 As String = PdfJavaScript.GetDateKeystrokeString("mm/dd/yyyy")

            Dim jsAction1 As New PdfJavaScriptAction(js1)

            textbox1.Actions.KeyPressed = jsAction1

            js1 = PdfJavaScript.GetDateFormatString("mm/dd/yyyy")

            jsAction1 = New PdfJavaScriptAction(js1)

            textbox1.Actions.Format = jsAction1

            pdf.Form.Fields.Add(textbox1)

            '添加文本框，设置文本内容显示为邮政编码格式

            Dim textbox2 As New PdfTextBoxField(page, "SpecialFormat0-1-TextBox")

            textbox2.Bounds = New RectangleF(X + 400, Y, width, height)

            textbox2.BorderWidth = 0.75F

            textbox2.BorderStyle = PdfBorderStyle.Solid

            'string js2 = PdfJavaScript.GetSpecialKeystrokeString(0);

            Dim js2 As String = PdfJavaScript.GetSpecialKeystrokeString(1)

            Dim jsAction2 As New PdfJavaScriptAction(js2)

            textbox2.Actions.KeyPressed = jsAction2

            'js2 = PdfJavaScript.GetSpecialFormatString(0);

            js2 = PdfJavaScript.GetSpecialFormatString(1)

            jsAction2 = New PdfJavaScriptAction(js2)

            textbox2.Actions.Format = jsAction2

            pdf.Form.Fields.Add(textbox2)

            '添加文本框，设置文本内容显示为百分数

            Dim textbox3 As New PdfTextBoxField(page, "SpecialFormat2-TextBox")

            textbox3.Bounds = New RectangleF(X, Y + 50, width, height)

            textbox3.BorderWidth = 0.75F

            textbox3.BorderStyle = PdfBorderStyle.Solid

            Dim js3 As String = PdfJavaScript.GetPercentKeystrokeString(1, 0)

            Dim jsAction3 As New PdfJavaScriptAction(js3)

            textbox3.Actions.KeyPressed = jsAction3

            js3 = PdfJavaScript.GetPercentFormatString(1, 0)

            jsAction3 = New PdfJavaScriptAction(js3)

            textbox3.Actions.Format = jsAction3

            pdf.Form.Fields.Add(textbox3)

            '添加文本框，设置数据验证

            Dim textbox4 As New PdfTextBoxField(page, "RangeValidate-TextBox")

            textbox4.Bounds = New RectangleF(X + 200, Y + 50, width, height)

            textbox4.BorderWidth = 0.75F

            textbox4.BorderStyle = PdfBorderStyle.Solid

            Dim js4 As String = PdfJavaScript.GetRangeValidateString(True, -18, True, 18)

            Dim jsAction4 As New PdfJavaScriptAction(js4)

            textbox4.Actions.Format = jsAction4

            pdf.Form.Fields.Add(textbox4)

            '保存文档

            pdf.SaveToFile("FormatField.pdf", FileFormat.PDF)

        End Sub

    End Class

End Namespace

设置后的文本框域填写效果如图：

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