jQuery 101 - Change CSS not working with advanced selectors_问答_开发者

jQuery 101 - Change CSS not working with advanced selectors

开发者 https://www.devze.com 2023-01-27 11:18 出处：网络

This is across IE and Firefox. I have an unordered list of 5 items within li tags. <script type=\"text/javascript\">

This is across IE and Firefox.

I have an unordered list of 5 items within li tags.

<script type="text/javascript">
$(function() //when doc is ready
    {
                $("li:first").css('color', 'red');

    }); 

</script>

That does absolutely nothing, however if I leave out the :first part, it makes all li's red, unsure of why since I'm following a tutorial.

Here is the html:

<div id="container">
<script type="text/javascript"><!--
$(function() //when doc is ready
{
    $("li:first").css('color', 'red');
});//--></script>

<div id="leftcontent">
<center><img src="http://www.dmu.com/5f/images/thiszis.png"><开发者_开发技巧/center>
<div id="hoastdears">
<ul>

<li>item1</li>
<li>item2</li>
<li>item3</li>
<li>item4</li>
<li>item5</li>
</ul>

With

in the header.

Specify a context for your li:first selector. Something like:

$("li:first", "ul:first").css("color", "red");

Try this

$(document).ready(function(){
        $("li:first").css('color', 'red');
});

Here is a link to the jQuery API http://api.jquery.com/ready/

It works for me as is, the problem must be somewhere else:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head><title></title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script type="text/javascript"><!--
$(function() //when doc is ready
{
    $("li:first").css('color', 'red');
});//--></script>
</head>
<body>

<ul>
    <li>First</li>
    <li>Second</li>
    <li>Third</li>
</ul>

</body>
</html>

Update: Find your browser's JavaScript console (in Firefox, it can be found under the Tools menu). You might have a syntax error somewhere that's preventing JavaScript code from executing.