Reference Guide
Reference Guides / JavaScript API / Events / RegisterOnRotationChanged
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    This function allows you to trigger a function of your own when the rotation change event is fired.

    RegisterOnRotationChanged: function (docuViewareID, callback)


    The identifier for the DocuVieware™ instance.
    The function you want to execute on event.
    The callback provides an integer as argument, this is the numeric value of a GdPictureRotateFlipType enumeration member that represents the current rendering rotation.
    Basically 0 means no rotation, 1 means 90° clockwise rotation, 2 means 180° rotation and 3 means 270° clockwise (or 90° counterclockwise) rotation.

    Return Value

    1 if error.

    Example of usage

    This JavaScript makes sure the DocuVieware control is properly loaded and initialized and then subscribes to the event on load.

    function RegisterOnRotationChangedOnDocuViewareAPIReady() {
        if (typeof DocuViewareAPI !== "undefined" && DocuViewareAPI.IsInitialized("DocuVieware1")) {
            DocuViewareAPI.RegisterOnRotationChanged("DocuVieware1", function (rotation) { console.log(rotation); });
        else {
            setTimeout(function () { RegisterOnRotationChangedOnDocuViewareAPIReady() }, 10);
    document.addEventListener("DOMContentLoaded", function () {
    }, false);