onBeforeZoom

fires before zoom level of the calendar is changed

level	number	new zoom level
prev_level	number	old zoom level

Example

$$("calendar1").atachEvent("onBeforeZoom", function(level, prev_level){
    //code
});

Webix calendar features 3 zoom levels:

• 0 - the initial zoom level, month view is displayed;
• 1 - year view with month names is displayed;
• 2 - ten-year period with year numbers is displayed

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