MultiCombo that Remember Selection through page

[MichaelSogos]

Hi,

I resolve what i write in title my self.

I post here my solution because i think could be implemented better by you.

Scenario:
Create a multicombo dynamically (in page init)
Create and associate a store to multicombo (in page init)

In my case i choose for remote page and sort for scalability reason but this is not important, also create in codebehind not is a need.

 Dim ComboBox as New Ext.Net.MultiCombo
 ComboBox.selectionMode = Ext.Net.MultiSelectMode.All
 ComboBox.id = "MyID"
 ComboBox.ID = FormField.@ID
 ComboBox.FieldLabel = "MyCombo"
 ComboBox.Triggers.Add(New Ext.Net.FieldTrigger With {.Icon = TriggerIcon.Clear, .HideTrigger = True})
 ComboBox.Listeners.TriggerClick.Handler = "if (index == 0) { this.clearValue(); this.triggers[0].hide(); }"
 ComboBox.Listeners.Select.Handler = "this.triggers[0].show();"

 Dim Store As New Ext.Net.Store
 Store.RemotePaging = True
 Store.RemoteSort = True
 Store.BaseParams.Add(New Ext.Net.Parameter With {.Name = "start", .Value = "0", .Mode = ParameterMode.Raw})
 Store.BaseParams.Add(New Ext.Net.Parameter With {.Name = "limit", .Value = "10", .Mode = ParameterMode.Raw})
 Store.Proxy.Add(New Ext.Net.PageProxy)
 Store.AutoLoad = False
 AddHandler Store.RefreshData, AddressOf MultiBoxStore_RefreshData

 Dim StoreReader As New JsonReader
 StoreReader.Fields.Add(New Ext.Net.RecordField("Display", RecordFieldType.String))
 StoreReader.Fields.Add(New Ext.Net.RecordField("Value", RecordFieldType.String))
 Store.Reader.Add(StoreReader)

 ComboBox.DisplayField = "Display"
 ComboBox.ValueField = "Value"
 ComboBox.PageSize = Integer.Parse(FormField.@PageSize)
 ComboBox.Store.Add(Store)

 Container.Items.Add(ComboBox)

After try about two day a way to save/remember selection when i change page for scroll into data and nothing goes (viewstate,session,js script,etc.) i realize that there some limitation by control design to preselect items; what i understand is that if i can reinsert my previous selected item into store dataitems all goes right without complicated solution.

Here is what i do in RefreshData event

 Private Sub MultiBoxStore_RefreshData(sender As Ext.Net.Store, e As Ext.Net.StoreRefreshDataEventArgs)     
        Dim DataSource As New List(Of MyEntityClass)

        If TypeOf sender.Parent Is Ext.Net.MultiCombo Then
            For Each Item In CType(sender.Parent, Ext.Net.MultiCombo).SelectedItems
                DataSource.Add(New MyEntityClass With {.Display = Item.Text, .Value = Item.Value})
            Next
        End If

        Dim OnlySelectedValues = (From Record In DataSource Select Record.Value Distinct).ToList
        Dim MyDataBaseDataPaged = (From Record In DataContext.MyEntityClass Skip e.Start Take e.Limit).ToList
        Dim ItemsToAdd = From Record In MyDataBaseDataPaged Where Not OnlySelectedValues.Contains(Record.Value) 'For not repeat twice same item

        'Is a separator for userfriendly look, the "," in value help me to render unselectable this item
        DataSource.Add(New MyEntityClass With {.Value = ",", .Display = "<i>-- Items already selected --</i>"})

        DataSource.AddRange(ItemsToAdd)

        sender.DataSource = DataSource

        e.Total = DataContext.MyEntityClass.Count

    End Sub

How you can see is a very simple solution for a complex problem, what i ask to you is to give us this possibility by control design and a new listitem type for render separator without create complex template layout

For any question i'm here for you

[Daniil]

Hi,

Thanks for sharing.

Do you mind to move the thread to the Examples and Extras forum?
http://forums.ext.net/forumdisplay.p...les-and-Extras