How to change placeholder color on focus?

How to change the color of placeholder when focus the input field? I use this css to set the default color, but how to change it on focus?

::-webkit-input-placeholder { color: #999; }

/* Firefox < 19 */
:-moz-placeholder { color: #999; }

/* Firefox > 19 */
::-moz-placeholder { color: #999; }

/* Internet Explorer 10 */
:-ms-input-placeholder { color: #999; }

Try this, this should work :

input::-webkit-input-placeholder {
    color: #999;
}
input:focus::-webkit-input-placeholder {
    color: red;
}

/* Firefox < 19 */
input:-moz-placeholder {
    color: #999;
}
input:focus:-moz-placeholder {
    color: red;
}

/* Firefox > 19 */
input::-moz-placeholder {
    color: #999;
}
input:focus::-moz-placeholder {
    color: red;
}

/* Internet Explorer 10 */
input:-ms-input-placeholder {
    color: #999;
}
input:focus:-ms-input-placeholder {
    color: red;
}

Here is an example : http://jsfiddle.net/XDutj/27/

In addition to Pranav answer I refined the code with textarea compatibility:

::-webkit-input-placeholder { color: #999; }
:-moz-placeholder { color: #999; }

:focus::-webkit-input-placeholder { color: #ccc; }
:focus:-moz-placeholder { color: #ccc; }

Try this:

HTML

<input type='text' placeholder='Enter text' />

CSS

input[placeholder]:focus { color: red; }

I've found this solution with JQuery:

 $('input[type="text"]').each(function(){

    $(this).focus(function(){
      $(this).addClass('input-focus');
    });

    $(this).blur(function(){
      $(this).removeClass('input-focus');
    });

  });

with this css:

.input-focus::-webkit-input-placeholder { color: #f00; }    
.input-focus:-moz-placeholder { color: #f00; }
.input-focus:-ms-input-placeholder { color: #f00; }

Use star * to select everything

*::-webkit-input-placeholder { color: #999; }


*:-moz-placeholder { color: #999; }


*::-moz-placeholder { color: #999; }


*:-ms-input-placeholder { color: #999; }

Bel

The following worked for me:

input:focus::-webkit-input-placeholder
{
    color: red;
}

From Firefox 19: The :-moz-placeholder pseudo-class that matches form elements with the placeholder attribute has been removed, and the ::-moz-placeholder pseudo-element has been added instead.

input:focus::-moz-placeholder { color: transparent; }

You can create a material design animated placeholder that shrinks on top when input field is focused.

<div class="field">
 <input type="text" name="user" required><br>
 <label>Enter Username</label>
 </div>

Basically the label field is going to act like a placeholder. We can do this only using css. Explained here http://www.voidtricks.com/create-material-design-animated-placeholder/

来源：https://stackoverflow.com/questions/13183421/how-to-change-placeholder-color-on-focus

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html

css

colors

focus

placeholder