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Three traversal methods of each in Jquery

韦小宝Original: 2017-11-27 10:05:211925browse

JqueryThe three traversal methods of each, let you see the useful each method in jquery, for jqueryIf you are interested, you can collect it and take a look!

1. Selector + traversal

$('div').each(function (i){

i is the index value

this means getting and traversing each DOM object

});

2. Selector + traversal

$('div' ).each(function (index,domEle){

index is the index value

domEle means getting and traversing each dom object

});

3. A more applicable traversal method

1) First obtain a collection object

2) Traverse each element of the collection object

var d =$("div");

$.each(d,function (index,domEle){

d is the collection to be traversed

index is the index value

domEle means to traverse each dom pair

});

<!DOCTYPE html >
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>属性选择器学习</title>
<script language="JavaScript" type="text/javascript" src="jquery-1.7.1.min.js"></script>
<script language="javascript" type="text/javascript">
//使用jquery加载事件
$(document).ready(function (){
$("#btn0").click(function (){
//当点击按钮后，设置id=two的div的背景颜色是绿色
$("input[type=text]:enabled").each(function(index,domEle){
//domEle.value="xxxxx";
$(domEle).val("xxxxxxxx");
});
});

$("#btn1").click(function (){
//当点击按钮后，设置id=two的div的背景颜色是绿色
$("input[type=text]:disabled").each(function(index,domEle){
//domEle.value="xxxxx";
$(domEle).val("xxxxxxxx");
});
});

$("#btn2").click(function (){
//当点击按钮后，设置id=two的div的背景颜色是绿色
alert($("input[type=checkbox]:checked").length);
});

$("#btn3").click(function (){
//当点击按钮后，设置id=two的div的背景颜色是绿色
$("select option:selected").each(function(index,domEle){
//domEle.value="xxxxx";
alert($(domEle).text());
});
});
});
</script>
</head>
<body>
<form method="post" action="">
<input type="text" value="可见元素1" />
<input type="text" value="不可见元素1" disabled="disabled" />
<input type="text" value="可见元素2" />
<input type="text" value="不可见元素2" disabled="disabled" /><br>
<input type="checkbox" value="美女" />美女
<input type="checkbox" value="美男" />美男
<input type="checkbox" value="大爷" />大爷
<input type="checkbox" value="大妈" />大妈
<br>
<input type="radio" value="男" />男
<input type="radio" value="女" />女
<br>
<select id="zhiwei" size="5" multiple="multiple">
<option>php开发工程师</option>
<option>数据库管理员</option>
<option>系统分析师</option>
<option>保安</option>
</select>
<select id="xueli">
<option>大专</option>
<option>中专</option>
<option>小学</option>
</select>
</form>
<div style="clear:both;">
<input id="btn0" type="button" value="利用jquery对象实现 修改表单中可修改的文本域的值 $(&#39;input[type=text]:enabled&#39;)" /><br>
<input id="btn1" type="button" value="利用jquery对象实现 修改表单中不可修改的文本域的值 $(&#39;input[type=text]:disabled&#39;)" /><br>
<input id="btn2" type="button" value="利用jquery对象实现 获取选中的复选框的个数 $(&#39;input[type=checkbox]:checked&#39;)" /><br>
<input id="btn3" type="button" value="利用jquery对象实现 获取选中的下拉菜单的内容 $(&#39;select option:selected&#39;)" /><br>
</div>
</body>
</html>

The above is a brief description and code demonstration of the three traversal methods of each in Jquery.

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