Alert Once per Bar

[Lancer]

For a non-Wizard formula, I want an alert to occur only once per bar, the first time the alert condition is met in any bar. For a Wizard formula, with alerts setup in the "happen only the first time" section, the same is accomplished by adding this to the main section:

if (getBarState() == BARSTATE_NEWBAR) {
vLastAlert = -1;
}

When I add that to a non-Wizard formula, I don't get the same result. A sound alert, for example, plays every time the condition is met, not just once per bar. Tried removing those lines, and still the alert plays every time the condition is met. What do I need to do here?

[eSignal_JasonK]

Hello Lancer,

You could define a global flag and set to false initially. When your condition is first met, change the flag to true. Your condition needs to look at the flag as well. When the bar state returns BARSTATE_NEWBAR again, change the flag back to false. Try the following.

var vFlag = false;

function main() {
    if (getBarState() == BARSTATE_NEWBAR)
        vFlag = false;
    
    var vData1 = 5;
    var vData2 = 1;
    
    if (vData1 > vData2 && vFlag == false) {
        Alert.playSound("train.wav");
        vFlag = true;
    }
    
    return;
}