turn off slider in portrait mode?

[thomasSolyan]

I am trying to turn off the slider and remove all its css when orientation is 0 (portrait) or when:
window.addEventListener("resize", function() {
if ( (document.documentElement.offsetWidth < document.documentElement.offsetHeight) || (window.matchMedia("screen and (orientation: portrait)").matches) ) {

// turn off slider and reset original css

} else {
  slidr.create('panels-container', {
    controls: 'none',
    fade: true,
    overflow: true,
    keyboard: true,
    touch: true
  }).start();

}

Is there a way to do this? I have tried to .removeAttr('style data-style') but I need to return to original css before slider was attached.

here is my hack solution which uses a reload (not-good):

window.onload = function() {
var smLoad = window.sessionStorage.getItem('smLoad'),
bgLoad = window.sessionStorage.getItem('bgLoad'),

  smallLoad = function() {
    if (smLoad && smLoad === 'false' || !smLoad) {
      console.log('small');
      location.reload();
    }
  },

  bigLoad = function() {
    if (bgLoad && bgLoad === 'false' || !bgLoad) {
      console.log('big')
      location.reload();
    }
  };

if ( (document.documentElement.offsetWidth < document.documentElement.offsetHeight) || (window.matchMedia("screen and (orientation: portrait)").matches) ) {
console.log('portrait');
slidr.create('panels-container').stop();
window.sessionStorage.setItem('smLoad', 'true');
window.sessionStorage.setItem('bgLoad', 'false');
} else if ( (document.documentElement.offsetWidth > document.documentElement.offsetHeight) || (window.matchMedia("screen and (orientation: landscape)").matches) ) {
console.log('landscape');
slidr.create('panels-container', {
controls: 'none',
fade: true,
overflow: true,
keyboard: true,
touch: true
}).start();
window.sessionStorage.setItem('bgLoad', 'true');
window.sessionStorage.setItem('smLoad', 'false');
}

window.addEventListener("resize", function() {
if ( (document.documentElement.offsetWidth < document.documentElement.offsetHeight) || (window.matchMedia("screen and (orientation: portrait)").matches) ) {
smallLoad();
} else if ( (document.documentElement.offsetWidth > document.documentElement.offsetHeight) || (window.matchMedia("screen and (orientation: landscape)").matches) ) {
bigLoad();
}
}, false);

window.addEventListener("orientationchange", function() {
var orientation = (window.orientation != undefined);
console.log('orientationChange ' + orientation);
if (orientation === 0) {
smallLoad();
}
if (orientation === -90 || orientation === 90) {
bigLoad();
}
}, false);

}