Rating.onpreviewchange event

Artikel
01/26/2017

Raised when the user is choosing a new tentative Rating.

Syntax

<div data-win-control="WinJS.UI.Rating" 
    data-win-options="{onpreviewchange : handler}">
</div>

function handler(eventInfo) { /* Your code */ }
 
// addEventListener syntax
rating.addEventListener("previewchange", handler);
rating.removeEventListener("previewchange", handler);

Event information

Synchronous	No
Bubbles	No
Cancelable	Yes

Event handler parameters

eventInfo
Type: CustomEvent**

An object that contains information about the event. The detail property of this object contains the following sub-properties:
- detail.tentativeRating
  The new userRating.

Remarks

Setting event handlers declaratively (in HTML)

To set the event handler declaratively, it must be accessible to the global scope, and you must also call WinJS.Utilities.markSupportedForProcessing or WinJS.UI.eventHandler on the handler. You can make the handler accessible to the global scope by using WinJS.Namespace.define. For more information, see How to set event handlers declaratively.

Examples

This example defines a handler for the onpreviewchange event. When the user is choosing a new rating value, it outputs the tentative rating value (obtained from eventInfo.detail.tentativeRating) to a div element.

function previewChanged(eventInfo) {
    var previewChangeOutputDiv = document.getElementById("previewChangeOutputDiv");
    previewChangeOutputDiv.innerText = eventInfo.detail.tentativeRating;
}

WinJS.UI.eventHandler(previewChanged);

WinJS.Namespace.define("startPage", {
    previewChangedHandler: previewChanged
});

The next example creates Rating control, sets the onpreviewchange event, and creates the output div in HTML.

<div id="previewChangeRating" 
    data-win-control="WinJS.UI.Rating" 
    data-win-options="{onpreviewchange: startPage.previewChangedHandler}">
</div>
<div id="previewChangeOutputDiv">&nbsp;</div>

Requirements

Minimum WinJS version	WinJS 1.0
Namespace	WinJS.UI

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