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CSS selector usage analysis in jquery _jquery

Source: Internet
Author: User
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This example describes the CSS selector usage in jquery. Share to everyone for your reference. Specifically as follows:

jquery uses a set of CSS selectors, a total of 5 kinds, namely tag Selector, ID selector, class selector, universal selector and group selector, which are described as follows:

1. Tag Selector

Used to select an existing tag element in an HTML page, also known as an element selector, in the format: $ ("element"), such as $ ("div"), with Getelementbytagname

2. ID Selector

Used to get an element with an id attribute, in the following format: $ ("id"), with getElementById

Copy Code code as follows:
<input id= "Users" type= "text" value= "abc"/>
$ ("#users"). Val ();

3. Class Selector

Used to get an element with the class attribute, in the format: $ ("class")

Copy Code code as follows:
<input id= "txt" type= "text" class= "T"/>

To add a border style to this text box, first use the class attribute to bind the text box

Copy Code code as follows:
$ (". T"). CSS ("Border", "2px solid Blue");

4. Universal Selector

The Universal selector (*) matches all elements and is used in conjunction with context Search, which is to find all tags in the HTML page, $ ("*")

5. Group Selector

Also called the multi-element selector, which selects the results of all the specified selector combinations, the syntax is as follows:

Copy Code code as follows:
$ ("Selector1, Seletor2, Selector3")

Such as:

Copy Code code as follows:
$ ("Div, span, p.styleclass"). CSS ("Border", "1px solid Red");

Comprehensive Example:

Copy Code code as follows:
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<title>css selector </title>
<script type= "Text/javascript" src= "Jquery-1.7.min.js" ></script>
<style type= "Text/css" >
. One {border:1px solid #03F; float:left; margin:1em; padding:1.5em; width:106px;}
. Two {background-color: #FC0;}
. Three {background-color: #FCF;}
</style>
<script type= "Text/javascript" >
$ (document). Ready (function () {
$ ("*"). CSS ("Font-size", "12px");
$ ("div"). addclass ("one");
$ ("#div1"). AddClass ("two");
$ ("#div2, #div3"). AddClass ("three");
$ ("H3, P"). CSS ("Color", "red"). attr ("Align", "center");
$ ("#span1"). HTML ("There is a total of" + $ (". One") of the elements in this web page that applies a class at the same time. Length + "+", while the elements of one class and three class are all "+ $ (". One.three "). Length +" one ") ;
});
</script>
<body>
<p><span id= "Span1" ></span></p>
<div id= "Div1" &GT;DIV element: id attribute is div1.</div>
<div id= "Div2" &GT;DIV element: id attribute is div2.</div>
<div id= "Div3" &GT;DIV element: id attribute is div3.</div>
</body>

The effect diagram looks like this:

I hope this article will help you with your jquery programming.

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