Why doesn't jquery fadeIn() work with .html()?

When you click you a checkbox I want the message to fade in slowly.

Why doesn't .fadeIn() work in this example?

HTML:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="content-type" content="text/html;charset=utf-8"/>
        <title>Text XHTML Page</title>
        <link href="css/main.css" rel="stylesheet" type="text/css" media="all"/>
        <script type="text/javascript" src="http://www.google.com/jsapi"></script>
        <script type="text/javascript" src="javascript/main.js"></script>       
    </head>
<body>
    <div class="checkboxList">
        <div class="title">Languages:</div>
        <div class="row"><input class="checkbox" type="checkbox"/><span class="label">Ruby</span></div>
        <div class="row"><input type="checkbox"/><span class="label">PHP</span></div>
        <div class="row"><input type="checkbox"/><span class="label">C#</span></div>
        <div class="row"><input type="checkbox"/><span class="label">Python</span></div>
        <div class="row"><input type="checkbox"/><span class="label">JavaScript</span></div>
    </div>
    <p id="message"></p>
</body>
</html>

javascript:

google.load("jquery", "1.3.2");

//run when page is loaded
google.setOnLoadCallback(function() {

    $('.checkboxList .row').css('color','red');
    $('.checkboxList input').attr('checked', true);
    $('.checkboxList input').bind('click', function() {
        $('#message').html("You clicked on a checkbox.").fadeIn('slow');
    });

});

No fadeIn is done because the #message element is visible, hide it, add the content and fade it in:

$('#message').hide().html("You clicked on a checkbox.").fadeIn('slow');

after analize this problem, that I have to solve, this is my code, that works to use fadeout, change html and fadein

$("#div_big_picture").fadeOut('slow',function(){
    $(this).html("<img src='" + str_to_load + "' height='800px' />")
}).fadeIn("slow");

No idea why but I've had trouble chaining this before. You can get the effect you want by using this less elegant code:

google.load("jquery", "1.3.2");

//run when page is loaded
google.setOnLoadCallback(function() {

    $('.checkboxList .row').css('color','red');
    $('.checkboxList input').attr('checked', true);
    $('.checkboxList input').bind('click', function() {
        $('#message').hide(); //just in case
        $('#message').html("You clicked on a checkbox.");
        $('#message').fadeIn('slow');
    });

});

来源：https://stackoverflow.com/questions/1490563/why-doesnt-jquery-fadein-work-with-html

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fadein