Hi Dario,
1. I want to hide values that come as "NaN" from the Server. I tried using setFormattedValue(i,"");, but it doesn't effect.

// format _change
var newValue = itemUpdate.getFormattedValue("_change");

if ((isNaN(newValue)) || (newValue == null))
{
itemUpdate.setFormattedValue("_change","");
}
if (newValue != null)
{
var formattedVal = parseFloat(newValue);
if (formattedVal > 0)
{
formattedVal = "+" + formattedVal;
}

if ((itemUpdate.getServerValue("last_price")) == itemUpdate.getServerValue("ceiling"))
{
//ceiling price
formattedVal = "CE " + formattedVal;
}
else if ((itemUpdate.getServerValue("last_price")) == itemUpdate.getServerValue("floor"))
{
//floor price
formattedVal = "FL " + formattedVal;
}
itemUpdate.setFormattedValue("_change",formattedVa l);
} // end of if (newValue != null)

}

2. I want to format "bid1", "bid1vol", ..., "bid3vol" follow the rules :
loop from "bid1" field --> "bid3" field
{
if (bid1 price < reference price)
{
filling "bid1", "bid1vol" field by red color.
}
else if (bid1 price > reference price)
{
filling "bid1", "bid1vol" field by red color.
}
else if (bid1 price = reference price)
{
filling "bid1", "bid1vol" field by yellow color.
}
}

Like this (in my NonVisualTable code --> http://www.gls.com.vn:8080/priceonline/hose.html) :
-------
var PriceRe=parseFloat(itemUpdate.getServerValue("ref_ price"));

// format bid1vol, bid1 price, bid2vol, bid2 price, bid3vol, bid3 price
for (var i=4;i<=9;i+=2)
{
//ATO, ATC
if (isNaN(itemUpdate.getServerValue(i)))
{
itemUpdate.setAttribute(i,"#FFFFFF","#FFFFFF","col or");

itemUpdate.setAttribute(i+1,"#FFFFFF","#FFFFFF","c olor");

}

else if (cf(itemUpdate.getServerValue(i))==PriceRe)
{
itemUpdate.setAttribute(i,yellowColor,yellowColor, "color");

itemUpdate.setAttribute(i+1,yellowColor,yellowColo r,"color");

}
else if (cf(itemUpdate.getServerValue(i))<PriceRe)
{
itemUpdate.setAttribute(i,redColor,redColor,"color ");
itemUpdate.setAttribute(i+1,redColor,redColor,"col or");

}
else if (cf(itemUpdate.getServerValue(i))>PriceRe)
{
itemUpdate.setAttribute(i,greenColor,greenColor,"c olor");
itemUpdate.setAttribute(i+1,greenColor,greenColor, "color");
}
}