Why doesn't this JavaScript evaluation work?

I only want to execure a cerat开发者_StackOverflow中文版in code IF three input fields do not have empty values. So why doesn't this code work:

if($("#field1").val() != "" && $("#field2").val() != "" && $("#field3").val() != "")

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Make sure the input fields are named properly? They should have the id attribute for them set.

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Do all three inputs have ids matching your selectors? You may also want to check that the type of the values is not undefined like so:

if(typeof($('#field1').val())!='undefined' ...