Hiding fields when drop down selected

i have drop down box 3 choices - telephone/writing/not applicable

if telephone chosen want "text8" field box show
if writing "test7" show

if not applicable chosen - want neither box show....

this below isn’t working - when select "not applicable" still “text 8”
box displaying (but not “text7” box) (i brand new this) – wrong
please!!

thanks

if (event.value == "not applicable")

{

this.getfield("text8").display
= display.hidden;

this.getfield("text7").display =
display.hidden;

}

else if (event.value == "telephone")

{

this.getfield("text8").display =
display.visible;

this.getfield("text7").display =
display.hidden;

}

else if (event.value == "writing")

{

this.getfield("text7").display =
display.visible;

this.getfield("text8").display =
display.hidden;

}

you need use exact field names. in post, used "text7", "test7", , "text 8", "text8", , "text8", suspect there's typo in code.

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