Hi,
I guess a Callback is a pre-cursor of, rather than a full-blown, event.
But in this context, to all intents and purposes, yes - the second parameter points to a method to handle the return....
>I do not have a grasp on this. Are you saying a browser can respond to an event? So much to learn in this realm.
>tim
>
>>>Hi All,
>>>
>>>I have searched through book titles and many that I own only to find I don't have any good tutorials or reading on how to effectively use(learn) javascripting. I am paticuraly interested in learning how to navigate through controls with no intelisense, how to use hidden fields and access them both from the server side C# as well as from a javascript function. How to cause a postback from javascript and how to cause javascript to run from serverside method or code after a postback. Does anybody have any suggestions for good reading or tutorials on these topics?
>>>
>>>Right now I would like to do the following:
>>>Within a javascript event set a variable of some sort on the client side indicating a condition.
>>>Then cause a postback to server side code from this same function.
>>>When the postback finished, I need to have another javascript function execute to check if this variable is true and if so
>>>I can perform some additonal work on the client.
>>>I have been trying to find information on doing this type of stuff with no luck.
>>>
>>>I really need to find a good book or tutorial on how these types of things can be accomplished.
>>
>>Can't recommend a book. I use a webservice for something similar. Basic pattern is:
>> <script type="text/javascript">
>>
>> function GetKeyInfo() {
>> var KeyCode = document.getElementById("txtIncomingCode").value;
>> MyServer.SAWebServices.GetKeyInfo(KeyCode, OnGetKeyInfoSucceeded);
>> }
>>
>> function OnGetKeyInfoSucceeded(result) {
>> document.getElementById("txtIncomingCode").value = result.FormattedCompanyCode;
>> document.getElementById("lblKeyInfo").innerHTML = "Site Id: " + result.SiteId
>> + " Seq: " + result.Sequence
>> }
>></script>
>><body>
>> <asp:TextBox ID="txtIncomingCode" runat="server"></asp:TextBox>
>> <input id="btnClean" type="button" value="Verify" onclick="GetKeyInfo()" /><br />
>></body>
>>The button fires the GetKeyInfo() call to the webservice. OnGetKeyInfoSucceeded is the callback that fires when the response is received from the server. In this case the webservice returns a class instance with just three public string properties. You can access the class members directly in Javascript. But remember that you can't rely on session state in the webservice.
>>(Above is not complete code - elements missing from body....)
>>OTOH, you could look at using the AJAX UpdatePanel?
