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  • After page postback, DropDownList item attributes "color" cleared ?

    DropDownList1.SelectedItem.Attributes.Add("style", "Color:GREEN")
    This is set when a person clicks a button, "resubmit order"... then the selected item is turned green so they know they've already fixed that order item.
    Now if I select a different item, the page posts back to grab new information for another order...., but the previously set dropdownlist item, is no longer green.
    I'm not refilling the dropdown, if the postback=true, so I have no idea why the viewstate is not keeping the attributes of the dropdown list items.
    How can I preserve the color of dropdownlist items, after a postback ?

    ----------------------

    Try this:
    Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As EventArgs)
        For Each index As Integer In Me.SelectedItems
            DropDownList1.Items(index).Attributes.Add("style", "Color:GREEN;background:red")
        Next
    End Sub


    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)
        'DropDownList1.SelectedItem.Attributes.Add("style", "Color:GREEN");
        Dim selecteditems As List(Of Integer) = Me.SelectedItems
        selecteditems.Add(DropDownList1.SelectedIndex)
        Me.SelectedItems = selecteditems
    End Sub


    Private _SelectedItems As List(Of Integer)
    Public Property SelectedItems() As List(Of Integer)
        Get
            If ViewState("SelectedItems") IsNot Nothing Then
                _SelectedItems = DirectCast(ViewState("SelectedItems"), List(Of Integer))
            Else
                _SelectedItems = New List(Of Integer)()
            End If
            Return _SelectedItems
        End Get
        Set(ByVal value As List(Of Integer))
            ViewState("SelectedItems") = value
        End Set
    End Property

    http://forums.asp.net/p/1159612/1913450.aspx

    http://www.experts-exchange.com/Programming/Languages/.NET/ASP.NET/Q_25339597.html

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  • 原文地址:https://www.cnblogs.com/emanlee/p/1739582.html
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