no notification when wrong symbol specified in script

[trader42]

7.2 Beta (Build 519)

Please see attached script as an example.

There is no notification about the incorrect symbol when this script is applied, the screen displays "Loading Data ..."

PS. I was not able to upload the example .efs file, which is considered a non-recognized extension.

[eSignal_JasonK]

Hello trader42,

When you check for a null value with close(0, "foobar"), null doesn't get returned, the formula just stops computing and you don't get any feedback. Check for a null value using getNewestBarIndex("foobar") before hand. This one will give you a null value so you can handle the error after that and generate some feedback. Try the following:

function preMain() {
        setPriceStudy(false);
        setStudyTitle(" Spread ");
}

function main(Symbol) {
    if (Symbol != null) {
        var mySymbol = Symbol;
    } else {
        var mySymbol = getSymbol();    
    }
    var vCheck = getNewestBarIndex(mySymbol) ;
    if (vCheck==null) {
        myTitle = " Invalid Symbol! ";
        setStudyTitle(myTitle);
        return;
    } else {   
        var vOtherClose=close(0, mySymbol);
        return close(0)/vOtherClose;
    }
}