AJAX无刷新回调,根据参数判断执行回调_asp 无刷新回调-优快云博客

本文链接：https://blog.youkuaiyun.com/wxm0930/article/details/1330214

在做网页时，同一页面上通常我们会不止一次的用到回调，那么我们用方法能实现这样的效果呢？是定义多个回传接口还是通过参数判断来执行相应的语句块呢！

下面我用的是通过参数判断来实现

.aspx页面的head部分加入以下代码：

< script language = " javascript " type = " text/javascript " >

function selectpro(f,context) {

var val =f;

<%=cbReference%>

}

function cart(f,context) {

var val =f;

<%=cbReference%>

}

function fava(f,context) {

var val =f;

<%=cbReference%>

}

function ReceiveServerData(rValue,context) {

var context_obj=document.getElementById(context);

//context_obj.style.width=60;

//context_obj.style.height=40;

context_obj.innerHTML =rValue;

//startChange(context);

}

</ script >

上面代码定义了几个Button的OnClick函数，通过它把参数传到后台，在后台通过参数的判断来执行相应的语句块，具体如下：

.aspx.vb页代码：

Implements System.Web.UI.ICallbackEventHandler    ' 继承接口
    Public cbReference As String
    Public returnvalue As String       ' 定义两个公共变量，以便在后面代码中使用

’ 接受处理结果函数

Public Function GetCallbackResult() As String Implements System.Web.UI.ICallbackEventHandler.GetCallbackResult

Return returnvalue

End Function

‘ 事件处理

Public Sub RaiseCallbackEvent(ByVal eventArgument As String) Implements System.Web.UI.ICallbackEventHandler.RaiseCallbackEvent

If IsNumeric(eventArgument) Then ‘ 判断参数

Dim pagesource As New PagedDataSource

pagesource.AllowPaging = True

pagesource.PageSize = 10

pagesource.DataSource = reader.Rows

Dim first As Integer = pagesource.FirstIndexInPage

’-------------------------------------------------------------------------------------------------------------------------------

Dim sw1 As StringWriter = New System.IO.StringWriter()

Dim writer1 As HtmlTextWriter = New HtmlTextWriter(sw1)

writer1.AddAttribute("href", "#")

writer1.AddAttribute("onclick", "selectpro('0','context')")

writer1.RenderBeginTag(HtmlTextWriterTag.A)

writer1.Write("[首页]")

writer1.RenderEndTag()

Dim j, i As Integer

i = CInt(eventArgument)

If i < 6 Then

For j = 1 To 10

writer1.AddAttribute("href", "#")

writer1.AddAttribute("onclick", "selectpro(" + (j - 1).ToString + ",'context')")

writer1.RenderBeginTag(HtmlTextWriterTag.A)

writer1.Write(" " + j.ToString)

writer1.RenderEndTag()

If j = pagesource.PageCount Then

Exit For

End If

Else

For j = 1 To 10

writer1.AddAttribute("href", "#")

writer1.AddAttribute("onclick", "selectpro('" + (i - 4 - 1).ToString + "','context')")

writer1.RenderBeginTag(HtmlTextWriterTag.A)

writer1.Write(" " + (i - 4).ToString)

writer1.RenderEndTag()

i = (i - 4) + 1

If i > pagesource.PageCount Then

Exit For

End If

writer1.AddAttribute("href", "#")

writer1.AddAttribute("onclick", "selectpro('" + pagesource.PageCount.ToString + "','context')")

writer1.RenderBeginTag(HtmlTextWriterTag.A)

writer1.Write(" [尾页]")

writer1.RenderEndTag()

writer1.AddAttribute("width", "576")

writer1.AddAttribute("style", "font-size:13px")

writer1.AddAttribute("cellpadding", "0")

writer1.AddAttribute("cellspacing", "0")

writer1.RenderBeginTag(HtmlTextWriterTag.Table)

writer1.RenderBeginTag(HtmlTextWriterTag.Tr)

writer1.AddAttribute("width", "80")