1. Visibility filter selector
:hidden selects all invisible elements. For example:$(":hidden") means to select all invisible elements. Includes:
<input type="hidden" />
<div style="display:none;"></div>
<div style="visibity:hidden"></div>
Copy after login
Annotation content on the html page /**/,
,
(if this tag is on the page),
< /title>, <script src="*.js"></script>, <script type='text/JavaScript'></script>, <style type="text/css" ></style> <br/> and other elements. If you only want to remove the <input> element, you can use $("input:hidden"). Note that there is no space between input:hidden. We will explain the difference between the presence and absence of spaces later; <br/>Verification is as follows: <br/>Verification page code: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:html;toolbar:false"><!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>测试jQuery选择器</title>
<script src="Scripts/jquery-1.7.1.js"></script>
<style type="text/css">
.test {
background-color: yellow;
}
</style>
</head>
<body>
<input type="hidden" value="hidden"/>
<div style="display:none"></div>
<script type="text/javascript">
var $hidden1 = $(":hidden");
var $hidden2 = $("input:hidden");
var len1 = $hidden1.length;
var len2 = $hidden2.length;
console.log("$(':hidden').length:"+len1);
console.log("$('input:hidden').lengh:" + len2);
$.each($hidden1, function () {
console.log(this.nodeName+":"+ this.innerHTML);
});
$.each($hidden2, function () {
console.log(this.nodeName + ":" + this.innerHTML);
});
</script>
</body>
</html></pre><div class="contentsignin">Copy after login</div></div><p>The output result is as follows:</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:html;toolbar:false">$(':hidden').length:8
$('input:hidden').lengh:1
HEAD:
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>测试jQuery选择器</title>
<script src="Scripts/jquery-1.7.1.js"></script>
<style type="text/css">
.test {
background-color: yellow;
} </style>
META:
TITLE:测试jQuery选择器
SCRIPT:
STYLE: .test {
background-color: yellow;
}
INPUT:
DIV:
SCRIPT:
var $hidden1 = $(":hidden");
var $hidden2 = $("input:hidden");
var len1 = $hidden1.length;
var len2 = $hidden2.length;
console.log("$(':hidden').length:"+len1);
console.log("$('input:hidden').lengh:" + len2);
$.each($hidden1, function () {
console.log(this.nodeName+":"+ this.innerHTML);
});
$.each($hidden2, function () {
console.log(this.nodeName + ":" + this.innerHTML);
});
INPUT:</pre><div class="contentsignin">Copy after login</div></div><p style="margin: 0.8em 0px; padding: 0px; box-sizing: border-box; font-weight: 100; color: rgb(85, 85, 85); font-family: "microsoft yahei"; line-height: 35px; white-space: normal; widows: 1; background-color: rgb(255, 255, 255);">2. Whether there are spaces in the selector</p><p>The spaces in the selector cannot be ignored. The presence or absence of spaces will get different results. Look at the example below: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:html;toolbar:false"><!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>测试jQuery选择器</title>
<script src="Scripts/jquery-1.7.1.js"></script>
<style type="text/css">
.test {
background-color: yellow;
}
</style>
</head>
<body>
<div class="test">
<div style="display:none">a</div>
<div style="display:none">b</div>
<div style="display:none">c</div>
<div class="test" style="display:none">d</div>
</div>
<div class="test" style="display:none;">e</div>
<div class="test" style="display:none">f</div>
<script type="text/javascript">
var $t1 = $(".test :hidden");//带空格
var $t2 = $(".test:hidden");//不带空格
var len1 = $t1.length; var len2 = $t2.length;
console.log("$('.test :hidden').length:" + len1);
console.log("$('.test:hidden').length:" + len2);
$.each($t1, function () {
console.log(this.nodeName+":"+ this.innerHTML);
});
console.log();
$.each($t2, function () {
console.log(this.nodeName + ":" + this.innerHTML);
});
</script>
</body>
</html></pre><div class="contentsignin">Copy after login</div></div><p>The output result is as follows: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">$('.test :hidden').length:4
$('.test:hidden').length:3
DIV:a
DIV:b
DIV:c
DIV:d
DIV:d
DIV:e
DIV:f</pre><div class="contentsignin">Copy after login</div></div><span class="hljs-tag" style='color: rgb(0, 102, 102); box-sizing: border-box; font-family: "Source Code Pro", monospace; line-height: 20.3px; white-space: pre; widows: 1; background-color: rgba(128, 128, 128, 0.0470588);'><p>The reason why there are different results is because the descendant selector and filter selector are different. <br>$(".test :hidden") with spaces selects the hidden elements in the element with class "test", which is equivalent to .class *:hidden and is similar to the expression of css. </p>
<p>$(".test:hidden") without spaces selects the hidden element whose class is "test". </p></span> </div>
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