How Can I Animate an Element's Height to Its Natural Size Using jQuery?

Animatable Auto Height Elements with jQuery

Expanding elements to their natural height can be a tricky feat to accomplish with animation. As illustrated in the example provided, simply setting the height to "auto" may not trigger an animation.

To overcome this, a multi-step approach is required:

1. Preserve the Current Height:

   var curHeight = $('#first').height();

2. Set the Height Temporarily to Auto:

   $('#first').css('height', 'auto');

3. Calculate the Auto Height:

   var autoHeight = $('#first').height();

4. Restore the Previous Height and Animate:

   $('#first').height(curHeight).animate({height: autoHeight}, 1000);

5. Concatenate the Steps:

   var el = $('#first'),
       curHeight = el.height(),
       autoHeight = el.css('height', 'auto').height();
   el.height(curHeight).animate({height: autoHeight}, 1000);

By following these steps, elements can be smoothly animated to their natural height.

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