Setting height of text area based on text inside of it using jQuery

I have a <textarea> element in my form that has this code attached to it:

$('#links').focusin(function() {
    $('#links').animate({
        height: '100px'
    }, 300, function() {
        // done
    });
});

This works perfectly, when the text area gets focus it increases in height nicely to 100px. Now, I want it to shrink back down to a suitable size based on the text inside it when it loses focus. I wrote this:

$('#links').focusout(function() {
    $('#links').animate({
        height: 'auto'
    }, 300, function() {
        // done
    开发者_运维百科});
});

But it doesn't work, it just stays at the same height (100px). Is there any way to do this?

Thanks. :)

Edit: To save some confusion, the even handler for $('#links').focusout works fine, that's the first thing I tested. So I assume it's a problem with the animation or the CSS property.

Try $( '#links' ).blur( function(){ ... } ) instead

http://api.jquery.com/blur/

Edit, your actual code:

$('#links').blur(function() {
$('#links').animate({
    height: 'auto'
}, 300, function() {
    // done
});
});

Some other notes.. You can use $( '#links' ).focus() instead of focusin, and also, once you're in the function, you can use $( this ).animate(), as a shortcut. Just little tips and whatnot.

This isn't quite the same as what you're doing, but quite similar: http://james.padolsey.com/javascript/jquery-plugin-autoresize/

auto_height_link = $( '#links' ).css('height');
$('#links').focusin(function() {
    $(this).animate({
        height: '100px'
    }, 300, function() {
        // done
    });
}).focusout(function() {
    $(this).animate({
        height: auto_height_link
    }, 300, function() {
        // done
    });
});

but anyways the animate doesnt read the css value auto for height

i stumbled upon this http://www.unwrongest.com/projects/elastic/ which is what you need i guess

You can't use auto to animate in jQuery. You should set it to auto, then get the actual height (in px) and finaly animate it.

Take a look here