90 lines
2.4 KiB
Plaintext
90 lines
2.4 KiB
Plaintext
<%@ Page Language="C#" %>
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<%@ Implements Interface="System.Web.UI.ICallbackEventHandler" %>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" >
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<script runat="server" >
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string _eventName = "Test";
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string _cbMessage = "";
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// Define method that processes the callbacks on server.
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public void RaiseCallbackEvent(String eventArgument)
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{
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try {
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this.ClientScript.ValidateEvent (_eventName, this.ToString ());
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_cbMessage = "Correct event raised callback.";
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}
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catch (Exception ex) {
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_cbMessage = "Incorrect event raised callback.";
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}
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}
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// Define method that returns callback result.
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public string GetCallbackResult()
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{
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return _cbMessage;
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}
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protected void Page_Load(object sender, EventArgs e)
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{
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if (!IsPostBack)
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{
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ClientScriptManager cs = Page.ClientScript;
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String cbReference = cs.GetCallbackEventReference ("'" +
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Page.UniqueID + "'", "arg", "ReceiveServerData", "",
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"ProcessCallBackError", false);
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String callbackScript = "function CallTheServer(arg, context) {" +
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cbReference + "; }";
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cs.RegisterClientScriptBlock (this.GetType (), "CallTheServer",
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callbackScript, true);
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}
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}
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protected override void Render(HtmlTextWriter writer)
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{
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this.ClientScript.RegisterForEventValidation("Test", this.ToString());
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base.Render(writer);
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}
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public override string ToString () {
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return GetType ().Name;
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}
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</script>
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<script type="text/javascript">
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var value1 = new Date();
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function ReceiveServerData(arg, context)
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{
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Message.innerText = arg;
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Label1.innerText = "Callback completed at " + value1;
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value1 = new Date();
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}
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function ProcessCallBackError(arg, context)
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{
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Message.innerText = 'An error has occurred.';
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}
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</script>
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<html >
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<head id="Head1" runat="server">
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<title>CallBack Event Validation Example</title>
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</head>
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<body>
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<form id="Form1" runat="server">
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<div>
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Callback result: <span id="Message"></span>
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<br /> <br />
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<input type="button"
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id="button1"
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runat="server"
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value="ClientCallBack"
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onclick="CallTheServer(value1, null )"/>
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<br /> <br />
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<asp:Label id="Label1" runat="server"/>
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</div>
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</form>
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</body>
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</html>
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