VB.NET/C# and JavaScript communication
Introduction
This article is about passing data between VB.NET/C# WinForms and JavaScript.
Before reading further, let me warn you that this article is not about ASP.NET. Concepts covered in the article are applied to Desktop applications.
Background
I was working on a project which required data transfer between my VB.NET WinForms application and the JavaScript (inside an HTML page). Along the way, I hit certain problems, and trying to resolve them cost plenty of time on the web (on Google mostly), so I thought of this article as a platform for developers looking to sort out similar issues. There isn't much detail on this topic on the web apart from a couple of Hello World examples from Microsoft on MSDN.
Starting point
OK, without any further talk, I will dig in to the subject.
Hello World
To start off, we'll start with a very simple example; all this will do is call a JavaScript function from VB.NET to display an alert with message 'Hello world'. Similarly, from the HTML page using JavaScript, we'll call a VB.NET function which will again display a messagebox with the message 'Hello world'. These are the steps you need to do to make it happen:
Calling JavaScript from VB.NET
In Visual Studio, create a new WinForms application, name it anything you like.
Add an import statement like Imports System.Security.Permissions in your form1 (main form).
Add a couple of attributes to form1, like:
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<PermissionSet(SecurityAction.Demand, Name:="FullTrust")> _
<System.Runtime.InteropServices.ComVisibleAttribute(True)> _
Public Class Form1
End Class
All they do is tell the .NET Framework that we want fulltrust and make the class visible to COM so this class is visible to JavaScript.
Add a WebBrowser control to the form and set its url property to c:\temp\mypage.html (just an example path, you should set it to the HTML page you'll be using).
Add a Button control on the form, and on its click handler, write this code:
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相关文档:
SCRIPT 标记
用于包含JavaScript代码.
属性
LANGUAGE 定义脚本语言
SRC 定义一个URL用以指定以.JS结尾的文件
window对象
每个HTML文档的顶层对象.
属性
frames[] 子桢数组.每个子桢数组按源文档中定义的 ......
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
&nb ......
在 .NET 里面使用 SQLite, 我这里使用的wrapper是 System.Data.SQLite,它只需要一个dll,接口符合ADO.Net 2.0的定义,性能也不错,NHibernate用的也是它,目前支持ADO.NET 3.5了,支持集成在 VS2005 和 VS2008里面,而且支持wince,是个亮点
因为符合ADO.NET的规范,所以使用方式,基本和 SqlClient, OleDb等原生的一致
us ......
通过前面几篇得知javascript写类无非基于构造函数
和原型
。既然这样,我们写个工具函数来写类。
/**
* $class 写类工具函数之一
* @param {Object} constructor
* @param {Object} prototype
*/
function $class(constructor,prototype) {
var c = constructor || function(){};
var p = prototype || {}; ......