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What are jquery's selectors?

Feb 28, 2022 pm 03:39 PM
jquerySelector

jquery’s selectors include: 1. Basic selectors (ID, element, class selector, etc.); 2. Basic filtering selectors (:first, :last, :even, etc.); 3. Content filtering Selectors (:empty, :has(), :parent, etc.); 4. Visibility filter selectors; 5. Attribute filter selectors, etc.

What are jquery's selectors?

The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.

Introduction to jQuery Selectors

jQuery selectors allow operations on groups of HTML elements or individual elements.

 JQuery selectors "find" (or select) HTML elements based on the element's id, class, type, attributes, attribute values, etc. It is based on existing CSS selectors, in addition to some custom selectors.

  All selectors in jQuery begin with a dollar sign: $().

1.Basic selector

$("#test")                    选择id值为test的元素,id值是唯一的所以返回单个元素。
$("div")                      选择所有的div标签元素,返回div元素数组 
$(".myclass")                 选择使用myclass类的css的所有元素 
$("*")                        选取所有元素。
$("#test,div,.myclass")        选取多个元素。

2.Hierarchical selector

$("div span")             选取<div>里的所有<span>元素
$("div >span")             选取<div>元素下元素名是<span>的子元素
$("#one +div")             选取id为one的元素的下一个<div>同辈元素        等同于$("#one").next("div")
$("#one~div")              选取id为one的元素的元素后面的所有<div>同辈元素    等同于$("#one").nextAll("div")
$("#one").siblings("div")      获取id为one的元素的所有<div>同辈元素(不管前后)
$("#one").prev("div")        获取id为one的元素的前面紧邻的同辈<div>元素

所以 获取元素范围大小顺序依次为:
$("#one").siblings("div")>$("#one~div")>$("#one +div")  
或是
$("#one").siblings("div")>$("#one").nextAll("div")>$("#one").next("div")

3.Basic filter selection Filter

$("div:first")                 选取所有<div>元素中第1个<div>元素
$("div:last")                   选取所有<div>元素中最后一个<div>元素
$("input:not(.myClass)")        选取class不是myClass的<input>元素 
$("input:even")                 选取索引是偶数的<input>元素(索引从0开始) 
$("input:odd")                  选取索引是基数的<input>元素(索引从0开始) 
$("input:eq(2)")                选取索引等于2的<input>元素 
$("input:gt(4)")                选取索引大于4的<input>元素
$("input:lt(4)")                选取索引小于4的<input>元素
$(":header")                    过滤掉所有标题元素,例如:h1、h2、h3等
$("div:animated")               选取正在执行动画的<div>元素  
$(":focus")                     选取当前获取焦点的元素

4. Content filter selector

$("div:contains(&#39;Name&#39;)")       选取所有<div>中含有&#39;Name&#39;文本的元素 
  
$("div:empty")                  选取不包含子元素(包括文本元素)的<div>空元素 

$("div:has(p)")                 选取所有含有<p>元素的<div>元素 

$("div:parent")                 选取拥有子元素的(包括文本元素)<div>元素

5. Visibility filter selector

    $("div:hidden")                 选取所有不可见的<div>元素 

    $("div:visible")                选取所有可见的<div>元素

6. Attribute filter selector

$("div[id]")                  选取所有拥有属性id的元素
$("input[name=&#39;test&#39;]")        选取所有的name属性等于&#39;test&#39;的<input>元素 
 
$("input[name!=&#39;test&#39;]")      选取所有的name属性不等于&#39;test&#39;的<input>元素 
 
$("input[name^=&#39;news&#39;]")        选取所有的name属性以&#39;news&#39;开头的<input>元素 
$("input[name$=&#39;news&#39;]")        选取所有的name属性以&#39;news&#39;结尾的<input>元素 
$("input[name*=&#39;news&#39;]")        选取所有的name属性包含&#39;news&#39;的<input>元素 
$("div[title|=&#39;en&#39;]")           选取属性title等于&#39;en&#39;或以&#39;en&#39;为前缀(该字符串后跟一个连字符&#39;-&#39;)的<div>元素
$("div[title~=&#39;en&#39;]")           选取属性title用空格分隔的值中包含字符en的<div>元素

$("div[id][title$=&#39;test&#39;]")     选取拥有属性id,并且属性title以&#39;test&#39;结束的<div>元素

7. Sub-element filter selector

$("div .one:nth-child(2)")       选取class为&#39;one&#39;的<div>父元素下的第2个子元素

$("div span:first-child")        选取每个<div>中的第1个<span>元素 

$("div span:last-child")         选取每个<div>中的最后一个<span>元素 

$("div button:only-child")       在<div>中选取是唯一子元素的<button>元素

8. Form object attribute filter selector

$("#form1 :enabled")             选取id为&#39;form1&#39;的表单内所有可用元素
$("#form2 :disabled")            选取id为&#39;form2&#39;的表单内所有不可用元素 
$("input :checked")              选取所有被选中的<input>元素   
$("select option:selected")      选取所有的select 的子元素中被选中的元素

9. Form selector

$(":input")                      选取所有<input>,<textarea>,<select> 和 <button>元素 
$(":text")                      选取所有的单行文本框
$(":password")                   选取所有的密码框 
$(":radio")                      选取所有单的选框 
$(":checkbox")                   选取所有的多选框 
$(":submit")                     选取所有的提交按钮
$(":image")                      选取所有的图像按钮 
$(":reset")                      选取所有的重置按钮
$(":button")                     选取所有的按钮 
$(":file")                       选取所有的上传域
$(":hidden")                     选取所有不可见元素

[Recommended learning: jQuery video tutorial, web front-end development video

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