JavaScript animation not functioning properly when height is set to "auto"

Can someone help me figure out why setting the height to "auto" in the code snippet below isn't working as expected? I want the DIV to adjust its size based on the content, but it's not happening. Any ideas on how to fix this issue would be greatly appreciated.

Check out the Fiddle HERE.

JavaScript Code:

$("a").click(function () {
    var page = $(this).data("page");
    if ($('div:animated').id != page) {
        var active = $(".fold.active");

        // Check if there is already a visible fold element on the page
        if (active.length) {
            active.animate({
                width: "0"
            }, 200)
                .animate({
                height: "0"
            }, 200, function () {
                $(this).removeClass("active");
            })

        }
        
        if (active.attr("id") != page) {
            $("#" + page)
                .addClass("active")
                .animate({
                height: "auto"
            }, 1000, 'linear')
                .animate({
                width: "200px"
            }, 400, 'linear')
        }
    }
});

Answer №1

One must determine the height required for the jQuery function animate() to be executed

See it in action - http://jsfiddle.net/7hcsv5dn/

var element = $("#" + page);
autoHeight = element.height();
$("#" + page)
    .addClass("active")
    .animate({
        height: autoHeight
     }, 1000, function () {
        element.height('auto');
     })
     .animate({
        width: "200px"
     }, 400, 'linear')

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