Answers for "show a hidden div jquery"

element is hidden jquery

// Checks CSS content for display:[none|block], ignores visibility:[true|false]
$(element).is(":visible");

// The same works with hidden
$(element).is(":hidden");

hide / show jquery

$("#demo").hide();      // sets to display: none
$("#demo").show(200);   // shows hidden elemnt with animation (speed)
$("#demo").toggle();    // toggle between show and hide

$( "#element" ).hide( "slow", function() {  // hide with callback function
console.log( "Animation complete." );
});