jQuery: Test if checkbox is NOT checked

Question

I\'m having trouble figuring this out. I have two checkboxes (in the future will have more):

• checkSurfaceEnvironment-1
• checkSurface

Answer 1

To do it with .attr() like you have, to see if it's checked it would be .attr("checked", "checked"), and if it isn't it would be .attr("checked") == undefined