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Firefox CSS3 transition won't work

http://jsfiddle.net/Calum/5dqwJ/

CSS:

 textarea {
        height: 20px;
        margin: 20px;
        width: 585px;
        resize: none;
        overflow: hidden;
        vertical-align: top;
        transition: height 3s;
        -webkit-transition: height 3s;
        -moz-transition: height 3s;
        -o-transition: height 3s;
    }

JavaScript:

 $(document).ready(function () {

     $("textarea").focus(function (event) {
         if ($(this).val().length === 0) {
             $(this).height(100);
             $(this).css('resize', 'vertical');
             $(this).attr('placeholder', null);
         }
     });


     $("textarea").blur(function (event) {
         if ($(this).val().length === 0) {
             $(this).height(20);
             $(this).attr('placeholder', "Enter comment");
             $(this).css('resize', 'none');
         }
     });

 });

HTML:

<textarea placeholder='Enter comment'></textarea>

In Chrome, IE, and Opera, when you focus on a textarea, it expands and contracts with a CSS3 transition.

When I do the same with FireFox it doesn't animate anything.

Any ideas why?

Thank!

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4 answers


If you add an attribute required

to a textarea, you can use the class pseudo-class :invalid

to target an empty textarea:

textarea {
    height: 100px;
    margin: 20px;
    width: 585px;
    resize: vertical;
    overflow: hidden;
    vertical-align: top;
    -webkit-transition: height .3s;
    -moz-transition: height .3s;
    -o-transition: height .3s;
    transition: height .3s;    
}

textarea:invalid{  /* single line*/
    height: 20px;
    resize: none;
}

textarea:focus{
    height: 100px;
    resize: vertical;
}


demo

(add box-shadow: none;

if you don't want a red border around it)

+2


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see this page for transitions

https://developer.mozilla.org/en-US/docs/CSS/Tutorials/Using_CSS_transitions

and you can do it completely with css, no need to use js



remove $ (this) .height (20); and $ (this) .height (100); From JS and ADD to css

textarea:focus{
   height: 100px;    
}
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Well, -> http://jsfiddle.net/FSEqT/

textarea:focus {
height: 300px;
margin: 20px;
width: 585px;
resize: none;
overflow: hidden;
vertical-align: top;
}

textarea {
height: 200px;
margin: 20px;
width: 585px;

transition: height 3s;
-webkit-transition: height 3s;
-moz-transition: height 3s;
-o-transition: height 3s;
}
+2


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There is no css transition in the code. But if you want it, then something like below should work. Just add it below textarea {...}

.

textarea:hover {
  height: 100px;
}
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