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can i use OR (||) AND (&&) together ?

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Mar 16.2009

hi

i want to know if the following if statement is valid….

its not throwing an error, but is also not doing what i want it to do….

I want to check if : (Hotel OR Car) and Leg1 =”” ….. then do something…

var f = document.forms[0];
var i;

if(((f.Air1.options[f.Airl1.options.selectedIndex].text !==”Hotel”) || (f.Air1.options[f.Air1.options.selectedIndex].text !==”Car”)) && (f.Leg1.value==””)) {

return false;
}

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JavaScript

2 Comments(s) ↴

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@Declan1991Mar 16.2009 — Yes, you can combine them any number of times. Another thing that doesn't matter is, you don't necessarily need all the brackets you have, I find the fewer that have to be used the better.if((f.Air1.options[f.Airl1.options.selectedIndex].text !=="Hotel" || f.Air1.options[f.Air1.options.selectedIndex].text !=="Car") && f.Leg1.value=="") {But that's just personal preference, just that you are aware that you don't necessarily need brackets (parentheses if you want to use the correct term) around everything. I would advise you always use it around the (x || y) because that makes it clear that it's && the result of that.
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@stirnpanzerauthorMar 16.2009 — thanks ........ yes too many brackets.... now ok ....
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