calculation with a normal field and a Dropdown (LOCKED)

hi,

i want create field give me amount of product needed according length of site , of box (selectable in list)

 

i've try :

 

 

var = number(this.getfield("sitesize").value);

var b = number(this.getfield("dropdownboxsize").value);

if (b==0) event.value = "";

else event.value = math.floor(a/b);

 

 

but it's not working.

any idea ?

please don't double-post same question.

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