Add $ sign to Ninja Tables price columns & No Price text to blank fields

Add $ sign to Ninja Tables price columns & No Price text to blank fields

const className = "price_format";

function addSign(){
    let val = parseInt(jQuery("td."+className).text());
    let value = $("td."+className).html();
    
    if(value.length<1){
        jQuery("td."+className).html('No Price');
    }
    else if($("td."+className).is(':empty')){
        jQuery("td."+className).html('No Price');
    }
    else{
        if( jQuery.isNumeric(val) ){
            jQuery("td."+className).prepend('<span>$</span>');
        }
    }
    jQuery("td."+className+" span:not(:first-child)").remove();
}

addSign();

$table.on('after.ft.paging', function() {
    addSign();
});

$table.on("after.ft.filtering", function() {
    addSign();
});
$table.on('click', function() {
    addSign();
});