Detailed explanation of the steps to dynamically load css files with jQuery-JS Tutorial-php.cn

Detailed explanation of the steps to dynamically load css files with jQuery

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Release： 2018-04-23 15:54:55

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This time I will bring you a detailed explanation of the steps for jQuery to dynamically load css files. What are the precautions for jQuery to dynamically load css files? The following is a practical case, let's take a look.

Sometimes we may need to use jQuery to load an external css file, such as when switching

page layout. The idea is to create a link element and add it to the tag. Let's first see how to use jQuery to achieve it.

The following is my favorite writing method:

$("<link>")
.attr({ rel: "stylesheet",
type: "text/css",
href: "site.css"
})
.appendTo("head");

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Some friends may use the following writing method, but the form is slightly different (append appendTo), the principle is still the same.

$("head").append("<link>");
css = $("head").children(":last");
css.attr({
rel: "stylesheet",
type: "text/css",
href: "/Content/Site.css"
});

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Finally, some friends may want to use it directly in javascript. The method is as follows:

function addCSS() {
var link = document.createElement('link');
link.type = 'text/css';
link.rel = 'stylesheet';
link.href = '/Content/Site.css';
document.getElementsByTagName("head")[0].appendChild(link);
}

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If it is during web interaction, we can use the above method to introduce a css file, otherwise it is recommended to use the original method.

Below I also introduce an example that can load js and css

The code is as follows

$.extend({
includePath: '',
include: function(file) {
var files = typeof file == "string" ? [file]:file;
for (var i = 0; i < files.length; i++) {
var name = files[i].replace(/^s|s$/g, "");
var att = name.split(&#39;.&#39;);
var ext = att[att.length - 1].toLowerCase();
var isCSS = ext == "css";
var tag = isCSS ? "link" : "script";
var attr = isCSS ? " type=&#39;text/css&#39; rel=&#39;stylesheet&#39; " : " language=&#39;javascript&#39; type=&#39;text/javascript&#39; ";
var link = (isCSS ? "href" : "src") + "=&#39;" + $.includePath + name + "&#39;";
if ($(tag + "[" + link + "]").length == 0) document.write("<" + tag + attr + link + "></" + tag + ">");
}
}
});
//使用方法
$.includePath = 'http://hi.xxx/javascript/'; 
$.include(['json2.js', 'jquery.tree.js', 'jquery.tree.css']);

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A complete example

index.html

<!-- Created by Barrett at RRPowered.com -->
<!-- File name index.html -->
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax
/libs/jquery/1.4.4/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="default.css">
<title>A simple jQuery image slide</title>
<script type="text/javascript">
$(function(){
$(".theme").click(function(){
var theme=$(this).attr("rel");
$("link").attr("href",$(this).attr('rel'));
$("head").append("<link>");
});
});
</script>
</head>
<body>
<p class="theme" rel="blue.css">Blue</p>
<p class="theme" rel="orange.css">Orange</p>
<p class="theme" rel="yellow.css">Yellow</p>
<p class="theme" rel="default.css">Default</p>
<p class="container">
<p class="menu">Tab1 Tab2 Tab3 Tab4 Tab5</p>
<p class="inner">
Lorem ipsum dolor sit amet
</p>
<p class="footer">copyright yoursite 2011</p>
</p>
</body>
</html>
default.css
body{
background-color:#ffffff;
font-family:"arial";
}
.theme{
margin:10px;
width:70px;
padding:5px;
text-align:center;
background-color:#BEF781;
border:solid #333333 1px;
color:#444444;
font-weight:bold;
cursor:pointer;
}
.container{
margin-left:auto;
margin-right:auto;
width:700px;
}
.inner{
padding:20px;
border:solid #333333 1px;
}
.menu{
background-color:#f2f2f2;
padding:10px;
font-weight:bold;
}
.footer{
background-color:#f9f9f9;
padding:5px;
}
blue.css
body{
background-color:#2E9AFE;
font-family:"arial";
}
.theme{
margin:10px;
width:70px;
padding:5px;
text-align:center;
background-color:#BEF781;
border:solid #333333 1px;
color:#444444;
font-weight:bold;
cursor:pointer;
}
.container{
margin-left:auto;
margin-right:auto;
width:700px;
}
.inner{
padding:20px;
border:solid #333333 1px;
background-color:#58ACFA;
color:#ffffff;
}
.menu{
background-color:#f2f2f2;
padding:10px;
font-weight:bold;
}
.footer{
background-color:#f9f9f9;
padding:5px;
}
yellow.css
body{
background-color:#F7FE2E;
font-family:"arial";
}
.theme{
margin:10px;
width:70px;
padding:5px;
text-align:center;
background-color:#BEF781;
border:solid #333333 1px;
color:#444444;
font-weight:bold;
cursor:pointer;
}
.container{
margin-left:auto;
margin-right:auto;
width:700px;
}
.inner{
padding:20px;
border:solid #333333 1px;
background-color:#f6f6f6;
}
.menu{
background-color:#F2F5A9;
padding:10px;
font-weight:bold;
}
.footer{
background-color:#F2F5A9;
padding:5px;
}
orange.css
body{
background-color:#FE9A2E;
font-family:"arial";
}
.theme{
margin:10px;
width:70px;
padding:5px;
text-align:center;
background-color:#BEF781;
border:solid #333333 1px;
color:#444444;
font-weight:bold;
cursor:pointer;
}
.container{
margin-left:auto;
margin-right:auto;
width:700px;
}
.inner{
padding:20px;
background-color:#F7BE81;
color:#404040;
}
.menu{
background-color:#ffffff;
padding:10px;
font-weight:bold;
color:#FFBF26;
}
.footer{
background-color:#ffffff;
padding:5px;
color:#FFBF26;
}

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!