我有一个页面，其中有一个 FormPanel（里面有一个 ComboBox）和一个 TreePanel（有一个默认的根节点），然后打开 ViewState。
我在 GET 中为 ComboBox 设置了一个值。
当我获取页面时，TreePanel 的商店在 FormPane 在客户端呈现之前发送一个 POST 请求（存储读取），在这个 POST 请求中，fromdata 没有关于 FormPane 的信息。
在 POST 请求中从 ViewState 中恢复 ComboBox.Value，但在 ComboBoxBase.LoadPostData() Ext.Net 中从 formdata 中获取值并覆盖 ComboBox.Value 而没有先决条件
这是 ComboBoxBase.LoadPostData() 代码
protected override bool LoadPostData(string postDataKey, NameValueCollection postCollection)
{
this.HasLoadPostData = true;
string text = postCollection[this.UniqueName];
string state = postCollection[this.ValueHiddenName.IsNotEmpty() ? this.ValueHiddenName : ("_" + this.UniqueName + "_state")];
this.SuspendScripting();
this.RawValue = text;
this.Value = text;
this.ResumeScripting();
if (state == null && text == null)
{
return false;
}
if (!this.EmptyText.Equals(text) && text.IsNotEmpty())
{
List<ListItem> items = null;
if (this.SimpleSubmit)
{
var array = state.Split(new char[] { ',' });
items = new List<ListItem>(array.Length);
foreach (var item in array)
{
items.Add(new ListItem(item));
}
}
else if(state.IsNotEmpty())
{
items = ComboBoxBase.ParseSelectedItems(state);
}
bool fireEvent = false;
if (items == null)
{
items = new List<ListItem>
{
new ListItem(text)
};
/*fireEvent = this.SelectedItems.Count > 0;
this.SelectedItems.Clear();
return fireEvent;
*/
}
foreach (var item in items)
{
if (!this.SelectedItems.Contains(item))
{
fireEvent = true;
break;
}
}
this.SelectedItems.Clear();
this.SelectedItems.AddRange(items);
return fireEvent;
}
else
{
if (this.EmptyText.Equals(text) && this.SelectedItems.Count > 0)
{
this.SelectedItems.Clear();
return true;
}
}
return false;
}
看看5到11号线，为什么不改成这样
string text = postCollection[this.UniqueName];
string state = postCollection[this.ValueHiddenName.IsNotEmpty() ? this.ValueHiddenName : ("_" + this.UniqueName + "_state")];
this.SuspendScripting();
this.RawValue = text;
this.ResumeScripting();
if (state == null && text == null)
{
return false;
}
this.SuspendScripting();
this.Value = text;
this.ResumeScripting();
此问题的示例
页面文件
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<ext:ResourceManager ID="ResourceManager1" runat="server" DisableViewState="false"
AjaxViewStateMode="Enabled" ViewStateMode="Enabled"/>
<form id="form1" runat="server">
<ext:Viewport runat="server" ID="VP">
</ext:Viewport>
</form>
</body>
</html>
.cs 文件
public partial class WebFormTest : System.Web.UI.Page
{
protected override void OnInitComplete(EventArgs e)
{
FP = new FormPanel();
FP.ID = "FP";
FP.Title = "FP";
FP.Region = Region.Center;
TF = new TextField();
TF.ID = "TF";
TF.FieldLabel = "TF";
CB = new ComboBox();
CB.ID = "CB";
CB.FieldLabel = "CB";
CB.Items.Clear();
CB.Items.Add(new ListItem("one", "1"));
CB.Items.Add(new ListItem("two", "2"));
Button test = new Button() { ID = "testbtn", Text = "test" };
test.Listeners.Click.Handler = "App.Store2.load()";
FP.TopBar.Add(new Toolbar() { Items = { test } });
FP.Items.Add(TF);
FP.Items.Add(CB);
GP = new GridPanel();
GP.ID = "GP";
GP.Title = "GP";
GP.Region = Region.East;
GP.Listeners.BeforeRender.Handler = "App.Store1.reload()";
BTN = new Button();
BTN.ID = "BTN";
BTN.Text = "click";
BTN.Icon = Icon.ArrowJoin;
BTN.DirectEvents.Click.Event += new ComponentDirectEvent.DirectEventHandler(Click);
TB = new Toolbar();
TB.Items.Add(BTN);
GP.TopBar.Add(TB);
Store1 = new Store();
Store1.ID = "Store1";
Store1.ReadData += new Store.AjaxReadDataEventHandler(WebFormTest_ReadData);
Model1 = new Model();
Model1.ID = "Model1";
Store1.Model.Add(Model1);
GP.Store.Add(Store1);
TP = new TreePanel();
TP.ID = "TP";
TP.Title = "TP";
TP.Region = Region.East;
TP.RootVisible = false;
TP.Root.Add(new Node() { NodeID = "test", Text = "test" });
Store2 = new TreeStore();
Store2.ID = "Store2";
Store2.ReadData += new TreeStoreBase.ReadDataEventHandler(Store2_ReadData);
TP.Store.Add(Store2);
VP.Items.Add(FP);
//VP.Items.Add(GP);
VP.Items.Add(TP);
if (!X.IsAjaxRequest)
{
CB.Value = "2";
TF.Value = "TEXT";
}
base.OnInitComplete(e);
}
FormPanel FP;
TextField TF;
ComboBox CB;
GridPanel GP;
Button BTN;
Toolbar TB;
Store Store1;
Model Model1;
TreePanel TP;
TreeStore Store2;
protected override void CreateChildControls()
{
base.CreateChildControls();
}
void Store2_ReadData(object sender, NodeLoadEventArgs e)
{
}
protected void Page_Load(object sender, EventArgs e)
{
//if (!X.IsAjaxRequest)
//{
// this.Store1.DataSource = this.Data;
// this.Store1.DataBind();
//}
}
protected void Refresh(object sender, DirectEventArgs e)
{
}
bool flag = false;
protected void Click(object sender, DirectEventArgs e)
{
GP.GetStore().Reload();
flag = true;
}
protected override void OnPreRender(EventArgs e)
{
if (flag)
{
TF.Value = "asdasd";
}
base.OnPreRender(e);
}
protected void WebFormTest_ReadData(object sender, StoreReadDataEventArgs e)
{
}
private object[] Data
{
get
{
return new object[]
{
new object[] { "3m Co", 71.72, 0.02, 0.03, "9/1 12:00am" },
};
}
}
}
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