CCI Crossover Alert
This very simple indicator will give you a blue background where the CCI crossed from below -100 to above -100, and a red background where it crossed from above 100 to below 100.
study("CCI Crossover Alert", overlay=true)
length=input(20, "Length", integer)
current = cci(close[0], length)
previous = cci(close[1], length)
bgcolor(current < 100 and previous > 100 ? red : na)
bgcolor(current > -100 and previous < -100 ? blue : na)
//plot(100, style=area, transp=95, color=blue)
//plot(-100, style=area, transp=95, color=blue)
//plot(cci(close, length))