EFS: alert and sound just once

[matt hellrich]

Hi folks,
I would like to have the following efs to sound and display the alert just once price crosses the threshold.


/************************************************** ***************
Provided By : eSignal. (c) Copyright 2003
************************************************** ***************/

function preMain() {
setStudyTitle(" Tick Extremes ");
setCursorLabelName("TICK C", 0);
setPlotType(PLOTTYPE_LINE, 0);
setStudyMax(1500);
setStudyMin(-1500);
}

var vColor = Color.white;
var vLoaded = false;

function main(nTickHigh, nTickLow, nNumOfBars) {
if (nTickHigh == null) nTickHigh = 1000;
if (nTickLow == null) nTickLow = -1000;
if (vLoaded == false) {
addBand(nTickHigh, PS_SOLID, 1, Color.yellow, "top");
addBand(0, PS_SOLID, 1, Color.grey, "zero");
addBand(nTickLow, PS_SOLID, 1, Color.yellow, "bottom");
vLoaded = true;
}

var c = close(0, 1, "$tick")*1;
if (c == null) return;

vColor = Color.white;

if (c > nTickHigh) {
vColor = Color.lime;
Alert.playSound("ding.wav");
Alert.addToList(getSymbol()+" "+getInterval(),"tick Up",Color.white,Color.lime);
}
if (c < nTickLow) {
vColor = Color.red;
Alert.playSound("ding.wav");
Alert.addToList(getSymbol()+" "+getInterval(),"tick down",Color.white,Color.red);
}

setBarFgColor(vColor, 0);

return c;
}


Please advice.

Thanks,
Matt

[ACM]

Matt
First create a global variable called for example vFlag and set it equal to 0 (or false);
Then in main reset that vFlag=0 (or false) at every new bar (ie inside a BARSTATE_NEWBAR statement).
Then in the conditions that trigger the alert add a vFlag == 0 (or false) condition).
Lastly after all the alert commands add vFlag = 1 (or true).
All these steps will allow the alert to trigger only once per event
Alex

[matt hellrich]

Hi Alex,

thanks for the quick response.
But that's way over my head.
I am pretty good at cut and paste.
So I cut the alert paragraph from one of the efs you helped me with before, and pasted it in this efs.
It kind of worked except the constant alert.
So if you have a free minute maybe you could "cut and paste" this flag etc command in this efs?

Thanks again,

Matt

[ACM]

Matt
The enclosed implements the changes I suggested. Comments are included in the script
Alex

function preMain() {
    setStudyTitle(" Tick Extremes ");
    setCursorLabelName("TICK C", 0);
    setPlotType(PLOTTYPE_LINE, 0);
    setStudyMax(1500);
    setStudyMin(-1500);
}

var vColor = Color.white;
var vLoaded = false;
var vFlag = false;//global variable vFlag set to false

function main(nTickHigh, nTickLow, nNumOfBars) { 

    if(getBarState()==BARSTATE_NEWBAR){//at every new bar
        vFlag = false; //reset vFlag to false
    }

    if (nTickHigh == null) nTickHigh = 1000;
    if (nTickLow == null) nTickLow = -1000;
    
    if (vLoaded == false) {
        addBand(nTickHigh, PS_SOLID, 1, Color.yellow, "top");
        addBand(0, PS_SOLID, 1, Color.grey, "zero");
        addBand(nTickLow, PS_SOLID, 1, Color.yellow, "bottom");
        vLoaded = true;
    }

    var c = close(0, "$tick");//modified
    if (c == null) return;

    vColor = Color.white;

    if (c > nTickHigh) {
        vColor = Color.lime;
        if(vFlag == false){//nested condition to check vFlag
            Alert.playSound("ding.wav");
            Alert.addToList(getSymbol()+" "+getInterval(),"tick Up",Color.white,Color.lime);
            vFlag = true;//set vFlag to true
        }
    }

    if (c < nTickLow) {
        vColor = Color.red;
        if(vFlag == false){//nested condition to check vFlag
            Alert.playSound("ding.wav");
            Alert.addToList(getSymbol()+" "+getInterval(),"tick down",Color.white,Color.red);
            vFlag = true;//set vFlag to true
        }
    }

    setBarFgColor(vColor, 0);

    return c;
} 

[matt hellrich]

GREAT!

Thank you kindly Alex.

Matt

[abarb]

alert and sound just once

Hello Alex,

I'm having kind of the same problem with multiple alerts being triggered. As you can see in the attached MA efs, the study gets updated on real time, which is the way it should work, but then I get a lot of alerts. Is there any way to limit the alerts and keep the real time feature?

Also, when an e-mail alert is sent, on the subject line I get the symbol and if crossed up or down. How can I just change it to just show "CROSSED UP" or "CROSSED DOWN" ?

Thanks in advance for your help,
Alejandro

[ACM]

Alejandro
The efs does exactly what it was originally requested to do (see this thread) which is to trigger a single alert every time the averages cross in a given direction. This means that the alert will reset and trigger again if during the bar the averages uncross and cross again.
Run a search for average* AND alert* and you should find several efs that will plot the averages in real time but will trigger the alerts only when the averages are crossed at the completion of the bar.
Alex