var slider1 = document.getElementById('disable1'),
	slider2 = document.getElementById('disable2'),
	checkbox1 = document.getElementById('checkbox1'),
	checkbox2 = document.getElementById('checkbox2'),
	checkbox3 = document.getElementById('checkbox3'),
	origins = slider2.getElementsByClassName('noUi-origin');

function toggle ( element ){

	// If the checkbox is checked, disabled the slider.
	// Otherwise, re-enable it.
	if ( this.checked ) {
		element.setAttribute('disabled', true);
	} else {
		element.removeAttribute('disabled');
	}
}

noUiSlider.create(slider1, {
	start: 80,
	connect: [true, false],
	range: {
		min: 0,
		max: 100
	}
});

noUiSlider.create(slider2, {
	start: [20, 80],
	range: {
		min: 0,
		max: 100
	}
});

checkbox1.addEventListener('click', function(){
	toggle.call(this, slider1);
});

checkbox2.addEventListener('click', function(){
	toggle.call(this, origins[0]);
});

checkbox3.addEventListener('click', function(){
	toggle.call(this, origins[1]);
});