How do I determine the state of a toggled element?

You can determine whether an element is collapsed or not by using the :visible and :hidden selectors.

                              var isVisible = $("#myDiv").is(":visible");
                            
                              var isHidden = $("#myDiv").is(":hidden");

If you're simply acting on an element based on its visibility, just include ":visible" or ":hidden" in the selector expression. For example:

                              $("#myDiv:visible").animate({
                            
                                left: "+=200px"
                            
                              }, "slow" );

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