The number of items in a Map is easily retrieved from itsĭetermining the number of items in an Object is more roundabout and less efficient. Object.getOwnPropertySymbols does the same String-keyed properties even if non-enumerable Object.keys includes only own, enumerable, Includes only enumerable string-keyed properties But note that no single mechanismĪll of an object's properties the various mechanismsĮach include different subsets of properties. The order was first defined for own properties only in ECMAScriptĢ015 ECMAScript 2020 defines order for inherited properties as well.Ībstract specification operations. This was not always the case, and the order is complex. Way: A Map object iterates entries, keys, and values inĪlthough the keys of an ordinary Object are ordered now, The keys in Map are ordered in a simple, straightforward Like the accidental keys issue, this can also be mitigated by usingĪ Map's keys can be any value (including functions, Setting user-provided key-value pairs on an Object may allowĪn attacker to override the object's prototype, which can lead to ()Ī Map is safe to use with user-provided keys and values.Object.prototype._lookupSetter_() Deprecated.Object.prototype._lookupGetter_() Deprecated.Object.prototype._defineSetter_() Deprecated.Object.prototype._defineGetter_() Deprecated.You can use the OnInitialize event RadMap exposes to get the JSON literal that will be passed to the Kendo Map widget and modify it according to some custom logic (e.g., some configuration that has not been done on the server for any reason).You can utilize the full Kendo Map API to build the desired options object according to your needs.This object is only available through the event arguments object of this event and is not available in later events.Įxample 5: Add a new markers layer to the map options before the widget initializes. Get Options Object Passed to the kendoMap() Constructor You can find an example of several of the map's events being handled in the Client-side API online demo. Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load Protected void Page_Load(object sender, System.EventArgs e) Its full API and events are available at this point.Įxample 4:: Attach client-side Map events in the markup and in the code-behind. OnLoad-fires when the RadMap client-side object is instantiated. You can find a simple demonstration in Example 5. The methods and events of the map are not available yet because the Kendo Map is not yet created. You can use it to apply modifications to the options JSON object. OnInitialize-fires before the serialized settings from the server are passed to the kendoMap() constructor as options. They receive two arguments - the RadMap and event arguments objects. There are two additional events that are specific to the nature of the ISciptControl. You can find examples of attaching and using the events in Example 4. The handler receives the Kendo Map event arguments. The server property only takes the handler function name as a string. The event name is constructed by concatenating On with the Kendo Map event name in PascalCase. RadMap exposes the Kendo Map client-side events in its markup (and, respectively, code-behind), via the inner tag (class). Map.center() //a simple array is used as argument Negative values are west of the Greenwich meridian Var longitude = 20 //this can be a float number. Var latitude = 30 //this can be a float number.
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