Custom Property that can be set client side and posted back to the server

[amgw]

I am trying to add a "ClientIsDirty" property to a control I am extending from TextField. I want to be able to set this on the client, and it should be available in the direct event. I want this to be as seemless as using the "Text" property on the server side (don't want to deal with extraparams, etc).

Thanks for your help.

[Daniil]

Hi,

Please see #3
http://forums.ext.net/showthread.php...ll=1#post31657

Regarding to:

it should be available in the direct event.

It needs to override the LoadPostData method.

As an example you can consider .LoadPostData() of the Ext.Net.TextFieldBase class.

[amgw]

Thank you for your reply. Can you provide a short example of what I should put in the overridden LoadPostData?
Thanks.

[Daniil]

Please just look at the .LoadPostData() method of the Ext.Net.TextFieldBase.

[amgw]

Excuse my ignorance, but what is "epy"?
Also, I looked at LoadPostData, but it seems that the postCollection contains one key/value pair per field. The key is the UniqueName of the field, and the value is the Value property. I don't see how this can be extended to contain extra properties.

Thanks

protected override bool LoadPostData(string postDataKey, NameValueCollection postCollection)        
{
            this.HasLoadPostData = true;


            string val = postCollection[this.UniqueName];
            val = val != null && val.Equals(this.EmptyText) ? "" : val;


            this.SuspendScripting();
            this.RawValue = val;
            this.ResumeScripting();


            if (val != null && this.Text != val)
            {
                bool raise = val != (this.Text ?? "");


                try
                {
                    this.SuspendScripting();
                    this.Text = val.Equals(this.EmptyText) ? "" : val;
                }
                finally
                {
                    this.ResumeScripting();
                }


                return raise;
            }


            return false;
}

[Vladimir]

You have to create hidden field and place a value to that hidden field
After that the value will be available in the postCollection

[amgw]

Thanks!! It worked. Below is the extended class.
I appreciate your help.

Public Class TxtField
        Inherits Ext.Net.TextField

        Public Property IsDirty As Boolean

        Public Sub New()
            AddHandler Me.Init, AddressOf TxtField_Init
        End Sub

        Protected Sub TxtField_Init(sender As Object, e As System.EventArgs)
            Dim txt = CType(sender, TxtField)

            txt.Controls.Add(New HiddenField With {.ID = ID & "IsDirty", .ClientIDMode = UI.ClientIDMode.Static})
            txt.Listeners.Change.Handler = String.Format("$('#{0}').val(this.originalValue != this.getValue());", ID & "IsDirty")
        End Sub

        Protected Overrides Function LoadPostData(postDataKey As String, postCollection As System.Collections.Specialized.NameValueCollection) As Boolean
            Boolean.TryParse(postCollection(UniqueID & "IsDirty"), IsDirty)
            Return MyBase.LoadPostData(postDataKey, postCollection)
        End Function
    End Class