In my web page source code I have:
Sys.Application.add_init(function() {
$create(Sys.UI._Timer, {"enabled":true,"interval":300000,"uniqueID":"timerMain"}, null, null, $get("timerMain"));
});
What is Sys.UI._Timer ? Is it a .Net class on the server side?
Sys.UI._Timer
is a class which resembles System.Web.UI.Timer
server control but runs in client-side (using JS) which creates timer control using AJAX client library. The default constructor definition of that class is shown below:
Sys.UI._Timer = function Sys$UI$_Timer(element) {
Sys.UI._Timer.initializeBase(this,[element]);
this._interval = 60000; // Interval property, measured in milliseconds
this._enabled = true; // Enabled property
this._uniqueID = null; // UniqueID property
// client-side only properties
this._postbackPending = false;
this._raiseTickDelegate = null;
this._endRequestHandlerDelegate = null;
this._timer = null;
this._pageRequestManager = null;
}
Note that $create
is shorthand from Sys.Component.create
static method, which creates (and also initializes) a component with specified type as parameter (in this case, Sys.UI._Timer
). The property values you want to set into component properties must be provided in JSON format and property names usage are given without underscores (hence _interval
becomes just interval
), using this syntax:
$create(type, { "propertyName": value, ... }, events, references, $get(elementName));
Further reading:
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