May 11, 2023, 9:32 AM
Custom state provider problem
Hello
I have a problem to setup custom state provider, can you please take a look what is wrong in code below?
problem: State is not restored
Code is bit longer as I tried to limit number of files.
So here is sample:
httpStateProviderHandler.ashx:
(just a pretty simple state handler, in my project is database driven state provider)
Page itself:
I have a problem to setup custom state provider, can you please take a look what is wrong in code below?
problem: State is not restored
Code is bit longer as I tried to limit number of files.
So here is sample:
httpStateProviderHandler.ashx:
(just a pretty simple state handler, in my project is database driven state provider)
<%@ WebHandler Language="C#" Class="HttpStateProviderHandler" %>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.SessionState;
using Ext.Net;
public class HttpStateProviderHandler : IHttpHandler,IReadOnlySessionState {
public class StateData
{
public int UserId { get; set; }
public string Key { get; set; }
public string Value { get; set; }
}
private static Dictionary<string, StateData> _dctState = new Dictionary<string, StateData>();
public void ProcessRequest (HttpContext context)
{
if (context.Request.HttpMethod == "POST")
{
StateData data = new StateData()
{
UserId = int.Parse(context.Request["UserId"].ToString()),
Key = context.Request["Key"],
Value = context.Request["Value"]
};
if (_dctState.ContainsKey(data.Key))
{
_dctState[data.Key] = data;
}
else
{
_dctState.Add(data.Key,data);
}
}
else if (context.Request.HttpMethod == "GET")
{
var userId = int.Parse(context.Request["userId"]);
var ret = JSON.Serialize(_dctState.Select(item => new {item.Key,item.Value.Value}).ToDictionary(item => item.Key));
context.Response.Write(ret);
}
else if (context.Request.HttpMethod == "DELETE")
{
var userId = int.Parse(context.Request["userId"]);
var key = context.Request["key"];
_dctState.Remove(key);
var result = new Dictionary<string, string>();
result.Add("success", "true");
JSON.Serialize(result);
}
}
public bool IsReusable {
get {
return false;
}
}
}Page itself:
<%@ Page Language="C#" %>
<script runat="server">
[DirectMethod(RethrowException = true)]
public static object LoadData(string action, Dictionary<string, object> extraParams)
{
DateTime now = DateTime.Now;
StoreRequestParameters prms = new StoreRequestParameters(extraParams);
var ret = new object[]
{
new object[] {1, "3m Co", 71.72, 0.02, 0.03, now },
new object[] {2, "Alcoa Inc", 29.01, 0.42, 1.47, now },
new object[] {3, "Altria Group Inc", 83.81, 0.28, 0.34, now },
new object[] {4, "American Express Company", 52.55, 0.01, 0.02, now },
new object[] {5, "American International Group, Inc.", 64.13, 0.31, 0.49, now },
new object[] {6, "AT&T Inc.", 31.61, -0.48, -1.54, now },
new object[] {7, "Boeing Co.", 75.43, 0.53, 0.71, now },
new object[] {8, "Caterpillar Inc.", 67.27, 0.92, 1.39, now },
new object[] {9, "Citigroup, Inc.", 49.37, 0.02, 0.04, now },
new object[] {10, "E.I. du Pont de Nemours and Company", 40.48, 0.51, 1.28, now },
new object[] {11, "Exxon Mobil Corp", 68.1, -0.43, -0.64, now },
new object[] {12, "General Electric Company", 34.14, -0.08, -0.23, now },
new object[] {13, "General Motors Corporation", 30.27, 1.09, 3.74, now },
new object[] {14, "Hewlett-Packard Co.", 36.53, -0.03, -0.08, now },
new object[] {15, "Honeywell Intl Inc", 38.77, 0.05, 0.13, now },
new object[] {16, "Intel Corporation", 19.88, 0.31, 1.58, now },
new object[] {17, "International Business Machines", 81.41, 0.44, 0.54, now },
new object[] {18, "Johnson & Johnson", 64.72, 0.06, 0.09, now },
new object[] {19, "JP Morgan & Chase & Co", 45.73, 0.07, 0.15, now },
new object[] {20, "McDonald\"s Corporation", 36.76, 0.86, 2.40, now },
new object[] {21, "Merck & Co., Inc.", 40.96, 0.41, 1.01, now },
new object[] {22, "Microsoft Corporation", 25.84, 0.14, 0.54, now },
new object[] {23, "Pfizer Inc", 27.96, 0.4, 1.45, now },
new object[] {24, "The Coca-Cola Company", 45.07, 0.26, 0.58, now },
new object[] {25, "The Home Depot, Inc.", 34.64, 0.35, 1.02, now },
new object[] {26, "The Procter & Gamble Company", 61.91, 0.01, 0.02, now },
new object[] {27, "United Technologies Corporation", 63.26, 0.55, 0.88, now },
new object[] {28, "Verizon Communications", 35.57, 0.39, 1.11, now },
new object[] {29, "Wal-Mart Stores, Inc.", 45.45, 0.73, 1.63, now }
};
return new { data = ret.Skip(prms.Start).Take(prms.Limit), total = 29 };
}
</script>
<!DOCTYPE html>
<html>
<head runat="server">
<title>Simple Array Grid With Paging and Remote Reloading - Ext.NET Examples</title>
</head>
<body>
<form runat="server">
<ext:ResourceManager runat="server" Namespace="" />
<ext:GridPanel
ID="GridPanel1"
runat="server"
Stateful="True"
StateID="GridPanel1"
Title="Array Grid"
Width="800">
<Store>
<ext:Store ID="Store1" runat="server" AutoLoad="True" PageSize="10" RemoteSort="true" RemotePaging="True">
<Model>
<ext:Model runat="server" IDProperty="id">
<Fields>
<ext:ModelField Name="id" />
<ext:ModelField Name="company" />
<ext:ModelField Name="price" Type="Float" />
<ext:ModelField Name="change" Type="Float" />
<ext:ModelField Name="pctChange" Type="Float" />
<ext:ModelField Name="lastChange" Type="Date" />
</Fields>
</ext:Model>
</Model>
<Proxy>
<ext:PageProxy DirectFn="Ext.net.DirectMethods.LoadData">
</ext:PageProxy>
</Proxy>
</ext:Store>
</Store>
<ColumnModel runat="server">
<Columns>
<ext:Column runat="server" Text="Company" DataIndex="company" Flex="1" />
<ext:Column runat="server" Text="Price" Width="75" DataIndex="price">
</ext:Column>
<ext:Column runat="server" Text="Change" Width="75" DataIndex="change">
</ext:Column>
<ext:Column runat="server" Text="Change" Width="75" DataIndex="pctChange">
</ext:Column>
<ext:DateColumn runat="server" Text="Last Updated" Width="125" DataIndex="lastChange" Format="H:mm:ss" />
</Columns>
</ColumnModel>
<View>
<ext:GridView runat="server" StripeRows="true" />
</View>
<BottomBar>
<ext:PagingToolbar runat="server">
</ext:PagingToolbar>
</BottomBar>
</ext:GridPanel>
</form>
<script>
Ext.define('App.util.HttpStateProvider', {
extend: 'Ext.state.Provider',
requires: ['Ext.state.Provider', 'Ext.Ajax'],
alias: 'util.HttpProvider',
processStateSave: false,
config: {
userId: null,
url: null,
stateRestoredCallback: null
},
constructor: function (config) {
if (!config.userId) {
throw 'App.util.HttpStateProvider: Missing userId';
}
if (!config.url) {
throw 'App.util.HttpStateProvider: Missing url';
}
this.initConfig(config);
var me = this;
//me.restoreState();
me.callParent(arguments);
},
get: function () {
return this.callParent(arguments);
},
set: function (name, value) {
//if (this.processStateSave == false)
//return;
var me = this;
if (typeof value == 'undefined' || value === null) {
me.clear(name);
return;
}
me.saveStateForKey(name, value);
me.callParent(arguments);
},
initStateFromData: function (result) {
for (var property in result) {
if (result.hasOwnProperty(property)) {
this.state[property] = this.decodeValue(result[property]);
}
}
},
// private
restoreState: function () {
var me = this,
callback = me.getStateRestoredCallback();
//debugger
//if (localStorage["alaState"] != null) {
// this.initStateFromData(localStorage["alaState"]);
// console.info('init state from storage');
// return;
//}
Ext.Ajax.request({
url: me.getUrl(),
method: 'GET',
params: {
userId: me.getUserId()
},
success: function (response, options) {
var result = JSON.parse(response.responseText.trim());
//localStorage["alaState"] = result;
this.initStateFromData(result);
if (callback) {
callback();
}
},
failure: function () {
console.log('App.util.HttpStateProvider: restoreState failed', arguments);
if (callback) { callback(); }
}
});
},
// private
clear: function (name) {
var me = this;
me.clearStateForKey(name);
me.callParent(arguments);
},
// private
saveStateForKey: function (key, value) {
var me = this;
Ext.Ajax.request({
url: me.getUrl(),
method: 'POST',
params: {
userId: me.getUserId(),
key: key,
value: me.encodeValue(value)
},
failure: function () {
console.log('App.util.HttpStateProvider: saveStateForKey failed', arguments);
}
});
},
// private
clearStateForKey: function (key) {
var me = this;
Ext.Ajax.request({
url: me.getUrl(),
method: 'DELETE',
params: {
userId: me.getUserId(),
key: key
},
failure: function () {
console.log('App.util.HttpStateProvider: clearStateForKey failed', arguments);
}
});
}
});
var alaStateProvider = new App.util.HttpStateProvider({
userId: 1,
url: 'HttpStateProviderHandler.ashx',
stateRestoredCallback: function () {
}
});
Ext.state.Manager.setProvider(alaStateProvider);
</script>
</body>
</html>
