What is attribute selector in jquery
In jquery, the attribute selector is a selector based on element attributes as filter conditions, which refers to a way to select elements through "element attributes"; this selector can find elements with specific attributes or Elements with specific attribute values, that is, you can match HTML elements through existing attribute names or attribute values, and then operate on HTML elements with specified attributes. The jQuery attribute selector makes the selector function like a wildcard, a bit like a regular expression.
The operating environment of this tutorial: windows7 system, jquery3.6 version, Dell G3 computer.
jquery attribute selector introduction
jQuery attribute selector is a selector based on element attributes as filter conditions.
Attribute selector refers to a way to select elements through "element attributes". Attribute selectors can find elements with specific attributes or specific attribute values, that is, they can match HTML elements through existing attribute names or attribute values, and then operate on HTML elements with specified attributes. We all know what the attributes of the
element are. The id, type, and value in the code below are the attributes of the input element.
<input id="btn" type="button" value="按钮" />
In jQuery, common attribute selectors are shown in the table. Where E refers to the element, attr refers to the attribute (attr), and value refers to the attribute value.
| Selector | Description |
|---|---|
| E[attr] | Select element E, where the E element must have the attr attribute |
| E[attr = “value”] | Select element E, where the value of the attr attribute of element E is value |
| E[attr!= “value”] | Select element E, where the value of attr of element E is value |
| E[attr!= “value”] | The attribute value is not value |
| E[attr ^= “value”] | Select element E, where the attr attribute value of E element starts with “value” Any character of |
| E[attr $="value"] | selects element E, where the value of the attr attribute of the E element is anything ending with "value" Characters |
| E[attr *= “value”] | Select element E, where the value of the attr attribute of the E element is any character containing “value” |
| E[attr |= “value”] | Select element E, where the attr attribute value of E element is equal to “value” or starts with “value” |
| E[attr ~= “value”] | Select element E, where the attr attribute value of E element is equal to “value” or contains “value” |
jQuery这些属性选择器使得选择器具有通配符的功能，有点正则表达式的感觉。下面我们通过一些简单实例来认识一下。
选取含有class属性的div元素：
$("div[class]")选取type取值为checkbox的input元素：
$("input[type = 'checkbox']")选取type取值不是checkbox的input元素：
$("input[type != 'checkbox']")选取class属性包含nav的div元素（class属性可以包含多个值）：
$("div[class *= 'nav']")选取class属性以nav开头的div元素，例如：
<div class="nav-header"></div>：
$("div[class ^= 'nav']")选取class属性以nav结尾的div元素，例如：
<div class="first-nav"></div>：
$("div[class $= 'nav']")选取带有id属性并且class属性是以nav开头的div元素，例如：
<div id="container" class="nav-header"></div>：
$("div[id][class ^='nav']")代码示例
<!DOCTYPE style="color:rgb(73 238 255)">html>
<style="color:rgb(73 238 255)">html>
<style="color:rgb(73 238 255)">head lang="style="color:rgb(255 95 0)">zh-CN">
<style="color:rgb(73 238 255)">meta charset="style="color:rgb(255 95 0)">UTF-8">
<style="color:rgb(73 238 255)">meta name="style="color:rgb(98 189 255)">viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<style="color:rgb(255 95 0)">title>多项选择器</style="color:rgb(255 95 0)">title>
<style></style>
</style="color:rgb(73 238 255)">head>
<body>
<section>
<ul id="style="color:rgb(255 111 119)">one" class="style="color:rgb(98 189 255)">eukaryotes_animal">
<li>猴子</li>
<li>猛犸</li>
<li>猩猩</li>
</ul>
<ul id="style="color:rgb(255 111 119)">two" class="style="color:rgb(98 189 255)">eukaryotes_plant">
<li>牡丹</li>
<li>樱花</li>
<li>仙人掌</li>
</ul>
<ul id='three' class="style="color:rgb(98 189 255)">prokaryotes_microbe">
<li>细菌</li>
<li>蓝细菌</li>
<li>放线菌</li>
<li>支原体</li>
</ul>
</section>
<script color:rgb(255 95 0)">https://style="color:rgb(255 111 119)">cdn.style="color:rgb(253 97 106)">bootcss.com/style="color:rgb(255 211 0)">jquery/3.3.1/style="color:rgb(255 211 0)">jquery.js"></script>
<script type="text/javascript">
$(document).ready(function () {
//此处填写代码
});
</script>
</body>
</style="color:rgb(73 238 255)">html>[attribute] 属性名选择器
选择拥有该属性名的元素。
var a=$('[id]'); console.log(a);
选中了示例中所有拥有id属性的元素
[attribute=value]属性值选择器
选择属性值为某个特定值的元素。
var a=$('[id=one]'); console.log(a);
选中了示例中id=one的元素
[attribute!=value]非属性值选择器
选择所有属性值不为特定值的元素（包括没有该属性的元素）
var a=$('[class!=eukaryotes_animal]'); console.log(a);
除了ul#one.eukaryotes_animal没有选中外，包括它的子元素在内的其他元素均在选择范围内。
[attribute^=value]属性值以某个字符串开头的选择器
var a=$('[class^=eukaryotes]'); console.log(a);
[attribute$=value]属性值以某个字符串结尾的选择器
var a=$('[class$=plant]'); console.log(a);
[attribute*=value]属性值中包含某个字符串的选择器
var a=$('[class*=yotes_m]'); console.log(a);
[selector1][selector2][selectorN] 多属性选择器(属性交集选择器)
var a=$('[class^=eukaryotes_][id]'); console.log(a);
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