With the new slider 1.5b, I get the following error when I start to drag the handle on IE:

'this.currentHandle' is null or not an object

I have a test site setup so you can see the issue, it is at ​http://gmaps.adceval.com/slider_issue/

Hopefully its an easy fix. Great job on everything.

-marc

In the current moveTo implementation, if the value is a string, its always handled as a relative value. Instead it should be checked if the value really starts with +=, and applying the relative stuff only then.

This works quite well:

if(value.constructor == String) {
	if (/^\-\=/.test(value) ) {
		value = this.value() - parseInt(value.replace('-=', ''), 10)
	} else if (/^\+\=/.test(value) ) {
		value = this.value() + parseInt(value.replace('+=', ''), 10)
	} else {
		value = parseInt(value, 10);
	}
}

This code initializes the options:

//Prepare the passed options
this.options = $.extend({}, options);
var o = this.options;
$.extend(o, {
	axis: o.axis || (element.offsetWidth < element.offsetHeight ? 'vertical' : 'horizontal'),
	maxValue: !isNaN(parseInt(o.maxValue,10)) ? parseInt(o.maxValue,10) :  100,
	minValue: parseInt(o.minValue,10) || 0
});

The docs say, for axis:

Normally you don't need to set this option because the plugin detects the slider orientation automatically. If the orientation is not correctly detected you can set this option to 'horizontal' or 'vertical'.

Looks to me like the specified option is always overwritten by the autodetection.