Fix for themes that erroneously submit placeholder text

/*
 This snippet is intended to fix themes that override form
 submissions and include placeholder text in the data submitted.
 Add this to your theme's functions.php file.
 */

function hide_tribe_placeholders($before) {
    $before .= '
<script type="text/javascript">
    jQuery(document).ajaxStart(function(){
        // Hides placeholder text for each element to prevent its submission
        jQuery(".tribe-bar-filters-inner input").each(function(){
            _self = jQuery(this);

            // Check to see if the value = placeholder value, clear it if so
            // Some themes set the value from the placeholder, causing erroneous data to submit
            if(_self.val() == _self.attr("placeholder"))
                _self.val("");

            // Store placeholder text in data, then clear placeholder
            jQuery.data(this, "tribe-placeholder", _self.attr("placeholder"));
            _self.attr("placeholder", "");
        });
    }).ajaxComplete(function(){
        // Shows placeholder text now that submission is complete
        jQuery(".tribe-bar-filters-inner input").each(function(){
            ptext = jQuery.data(this, "tribe-placeholder");
            if(typeof ptext === "string" && ptext != "")
                jQuery(this).attr("placeholder", ptext);
        });
    });
</script>';

    return $before;
}
add_filter( 'tribe_events_before_html', 'hide_tribe_placeholders');