Custom selectbox trigger onchange event multiple times

We have implemented a jQuery selectbox plugin and created a custom trigger event to get the data when a selectbox is changed. For example, we use this to select the desired product attribute options in a Magento shop.

Everything goes well until we select an option which has already triggered in the same 'session'. Then nothing happens. How is that possible?

The trigger event:

Element.prototype.triggerEvent = function(eventName)
    if (document.createEvent)
        var evt = document.createEvent('HTMLEvents');
        evt.initEvent(eventName, true, true);

        return this.dispatchEvent(evt);

    if (this.fireEvent)
        return this.fireEvent('on' + eventName);

var global_select = '';

function customEvent(id, event) {
    global_select = id;
    global_select = '';

The jQuery code:

jQuery('select').change(function(e) { 
    id = jQuery(this).attr('id');
    if (id && id != global_select)
        customEvent(jQuery(this).attr('id'), 'change');

    jQuery('select').each(function() {
        var id = jQuery(this).attr('id');
        if (jQuery(this).css('display') == 'none') {
        } else {

    if (jQuery(this).css('display') != 'none') {


We fixed this by changing the jQuery version from 1.10.2 to 1.8.2.

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