This article gives you a summary of how to use jQuery's four selectors and examples. It is very simple and practical. I hope it will be helpful for everyone to learn jquery.
jQuery Element Selector
## jQuery uses CSS selectors to select HTML elements. $("p") Selects theelement.
$("p.intro") selects allelements with class="intro".
$("p#demo") selects allelements with id="demo".
Sample code: jquery part$(document).ready(function(){//页面加载完成后执行
tagName();
// idName();
// className();
});
function tagName(){
$('p').addClass('heighlight');
}
function idName(){
$('#p').addClass('heighlight2');
}
function className(){
$('p.pClass').addClass('heighlight2');
}html part
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script type="text/javascript" src="js/jquery.js" ></script>
<script type="text/javascript" src="js/select.js" ></script>
<link rel="stylesheet" href="css/select.css" />
</head>
<body>
<p id="p">
<p>this is my name!!</p>
<p class="pClass">class is import!</p>
<a href="#">you cai!!</a>
</p>
</body>
</html>css section
.heighlight {
background-color: blue;
}
.heighlight2 {
background-color: red;
}
.alt{
background-color:#ccc;
}
Query Use XPath expressions to select with The element with the given attribute. $("[href]") Selects all elements with href attribute. $("[href='#']") Selects all elements with an href value equal to "#". $("[href!='#']") Selects all elements with an href value not equal to "#". $("[href$='.jpg']") Selects all elements whose href value ends with ".jpg". jquery part, other parts are the same as above.
$(document).ready(function(){
attribute();
});
function attribute(){
$('[href="#"]').addClass('heighlight');
}
jQuery CSS selector
.addClass() or .css()$(document).ready(function(){
cssName();
});
function cssName(){
$('p').css("background-color","pink");
}
jQuery Custom selector
$(document).ready(function(){
custom();
});
function custom(){
$('tr:odd').addClass('alt');
}Attachment
| Selector | Instance | Select |
|---|---|---|
| * | $(" *") | All elements |
| #id | $("#lastname") | Element with id="lastname" |
| .class | $(".intro") | All elements with class="intro" |
| element | $("p") | All elements |
| class.class | $(".intro.demo")All elements with class="intro" and class="demo" | |
| :first | $("p:first") | First element |
| :last | $("p:last") | The last element |
| :even | $(" tr:even") | All even |
| :odd | $("tr:odd") | All odd |
| :eq(index) | $(" ul li:eq(3)") | The fourth element in the list (index starts from 0) |
| :gt(no ) | $("ul li:gt(3)") | List elements with index greater than 3 |
| :lt( no) | $("ul li:lt(3)") | List elements with index less than 3 |
| :not(selector) | $("input:not(:empty)") | All input elements that are not empty |
| :header | $(":header") | All title elements- |
| :animated | All animated elements | |
| :contains(text) | $(" :contains('W3School')") | Contains all elements of the specified string |
| :empty | $(":empty") | All elements without child (element) nodes |
| :hidden | $("p:hidden") | All hidden The element |
| :visible | $("table:visible") | All visible tables |
| s1,s2,s3 | $("th,td,.intro") | All with matching Selected elements |
| [attribute] | $("[href]") | All elements with href attributes |
| [attribute=value] | $("[href='#']") | The value of all href attributes Elements equal to "#" |
| [attribute!=value] | $("[href!=' #']") | All elements whose href attribute value is not equal to "#" |
| [attribute$=value] | $("[href$='.jpg']") | The value of all href attributes contains elements ending with ".jpg" |
| :input | $(":input") | All elements |
| :text | $(":text") | All |
| :password | $(":password") | All elements of type="password" |
| :radio | $(":radio") | All elements of type="radio" |
| :checkbox | $(":checkbox") | All elements of type="checkbox" |
| :submit | $(":submit") | All elements of type="submit" |
| :reset | $ (":reset") | All elements of type="reset" |
| :button | $(":button") | All elements of type="button" |
| :image | $(":image") | All elements of type="image" |
| $(":file") | All elements of type="file" | |
| :enabled | $(":enabled") | All activated input elements |
| :disabled | $(":disabled") | All disabled input elements |
| :selected | $(":selected") | All selected input elements |
| :checked | $(":checked") | All selected input elements |
The above is the detailed content of jQuery four selector usage and examples. For more information, please follow other related articles on the PHP Chinese website!
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