我想要做的是从javascript调用vb.net函数
这是我的HTML代码。
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Untitled
Page
</title>
<script
src="jquery.js"></script>
<script
type="text/javascript">
$(function(){
$("button").click(showVbHelloWorld)
function
showVbHelloWorld()
{
window.external.showVbHelloWorld();
}
})
</script>
</head>
<body>
<button>A</button>
</body>
</html>
,这是我的vb.net代码
Imports System
Imports System.Windows.Forms
Imports System.Security.Permissions
<PermissionSet(SecurityAction.Demand, Name:="FullTrust")>
<System.Runtime.InteropServices.ComVisibleAttribute(True)>
<Microsoft.VisualBasic.ComClass()>
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles Button1.Click
Me.WebBrowser1.ObjectForScripting = Me
End Sub
Public Sub showVbHelloWorld()
MsgBox("Hello")
End Sub
End Class
仍然按下按钮点击图片错误
未捕获的TypeError:对象#没有方法'showVbHelloWorld'
抱歉我的代码格式不均匀...我是stackoverflow的新手......
答案 0 :(得分:3)
以下链接显示了如何操作:Call VB method from JavaScript
它基本上说有两种方式,Ajax或Postback。这是回发方法:
aspx文件:
<script type="text/javascript">
<!--
function callServersideFunction()
{
var someValueToPass = 'Hello server';
__doPostBack('CustomPostBack', someValueToPass);
}
// -->
</script>
aspx.vb文件:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Insure that the __doPostBack() JavaScript method is created...
Me.ClientScript.GetPostBackEventReference(Me, String.Empty)
If Me.IsPostBack Then
Dim eventTarget As String
Dim eventArgument As String
If ( (Me.Request("__EVENTTARGET") Is Nothing)
eventTarget = String.Empty
Else
eventTarget = Me.Request("__EVENTTARGET"))
If ( (Me.Request("__EVENTARGUMENT") Is Nothing)
eventArgument = String.Empty
Else
eventArgument = Me.Request("__EVENTARGUMENT"))
If eventTarget = "CustomPostBack" Then
Dim valuePassed As String = eventArgument
' Call your VB method here...
End If
End If
End Sub
答案 1 :(得分:1)
你必须把这个陈述
form_load
在Private Sub form1_Load(sender As Object, e As System.EventArgs) Handles Me.Load
Me.WebBrowser1.ObjectForScripting = Me
End Sub
UPDATE village
SET riverdepth = riverdepth - (10000 / COUNT(villagename))
WHERE countrycode(
SELECT countrycode
FROM country
WHERE countryname = 'italy')
看到这个网站: - http://www.codeproject.com/Articles/35373/VB-NET-C-and-JavaScript-communication