第3章 jQuery中的DOM操作
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2022-03-14 12:02:52
parent() 、parents()、closest() 区别示例： 鼠标移动到 a 上去，立即显示文字提示效果：this 当前对象，e 鼠标
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parent() 、parents()、closest() 区别示例：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>3-11-4</title>
<!-- 引入jQuery -->
<script src="../../scripts/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
//<![CDATA[
$(function(){
//parent
$("input:eq(0)").click(function(){
resetStyle();
$('.item-1').parent().css('background-color', 'red');
});
//parents
$("input:eq(1)").click(function(){
resetStyle();
$('.item-1').parents('ul').css('background-color', 'red');
});
//closest
$("input:eq(2)").click(function(){
resetStyle();
$('.item-1').closest('ul').css('background-color', 'red');
});
function resetStyle(){
$("*").removeAttr("style");
}
});
//]]>
</script>
</head>
<body>
<input type="button" value="parent()"/>
<input type="button" value="parents()"/>
<input type="button" value="closest()"/>
<ul id="one" class="level-1">
<li class="item-i">I</li>
<li id="ii" class="item-ii">II
<ul class="level-2">
<li class="item-a"><a href="#" class="item-1">Home</a></li>
<li class="item-b"><a href="#" class="item-2">Product</a></li>
<li class="item-c"><a href="#" class="item-3">About</a></li>
</ul>
</li>
<li class="item-iii">III</li>
</ul>
</body>
</html>
鼠标移动到 a 上去，立即显示文字提示效果：this 当前对象，e 鼠标
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>文字提示</title>
<!-- 引入jQuery -->
<script src="../../scripts/jquery.js" type="text/javascript"></script>
<style type="text/css">
body{
margin:0;
padding:40px;
background:#fff;
font:80% Arial, Helvetica, sans-serif;
color:#555;
line-height:180%;
}
p{
clear:both;
margin:0;
padding:.5em 0;
}
/* tooltip */
#tooltip{
position:absolute;
border:1px solid #333;
background:#f7f5d1;
padding:1px;
color:#333;
display:none;
}
</style>
<script type="text/javascript">
//<![CDATA[
$(function(){
var x = 10;
var y = 20;
$("a.tooltip").mouseover(function(e){
this.myTitle = this.title;
this.title = "";
var tooltip = "<div id='tooltip'>"+ this.myTitle +"<\/div>"; //创建 div 元素
$("body").append(tooltip); //把它追加到文档中
$("#tooltip")
.css({
"top": (e.pageY+y) + "px",
"left": (e.pageX+x) + "px"
}).show("fast"); //设置x坐标和y坐标，并且显示
}).mouseout(function(){
this.title = this.myTitle;
$("#tooltip").remove(); //移除
}).mousemove(function(e){
$("#tooltip")
.css({
"top": (e.pageY+y) + "px",
"left": (e.pageX+x) + "px"
});
});
})
//]]>
</script>
</head>
<body>
<p><a href="#" class="tooltip" title="这是我的超链接提示1.">提示1.</a></p>
<p><a href="#" class="tooltip" title="这是我的超链接提示2.">提示2.</a></p>
<p><a href="#" title="这是自带提示1.">自带提示1.</a></p>
<p><a href="#" title="这是自带提示2.">自带提示2.</a> </p>
</body>
</html>
鼠标移动到图片上，立即在旁边显示大图效果：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>图片提示</title>
<!-- 引入jQuery -->
<script src="../../scripts/jquery.js" type="text/javascript"></script>
<style type="text/css">
body{
margin:0;
padding:40px;
background:#fff;
font:80% Arial, Helvetica, sans-serif;
color:#555;
line-height:180%;
}
img{border:none;}
ul,li{
margin:0;
padding:0;
}
li{
list-style:none;
float:left;
display:inline;
margin-right:10px;
border:1px solid #AAAAAA;
}
/* tooltip */
#tooltip{
position:absolute;
border:1px solid #ccc;
background:#333;
padding:2px;
display:none;
color:#fff;
}
</style>
<script type="text/javascript">
//<![CDATA[
$(function(){
var x = 10;
var y = 20;
$("a.tooltip").mouseover(function(e){
this.myTitle = this.title;
this.title = "";
var imgTitle = this.myTitle? "<br/>" + this.myTitle : "";
var tooltip = "<div id='tooltip'><img src='"+ this.href +"' alt='产品预览图'/>"+imgTitle+"<\/div>"; //创建 div 元素
$("body").append(tooltip); //把它追加到文档中
$("#tooltip")
.css({
"top": (e.pageY+y) + "px",
"left": (e.pageX+x) + "px"
}).show("fast"); //设置x坐标和y坐标，并且显示
}).mouseout(function(){
this.title = this.myTitle;
$("#tooltip").remove(); //移除
}).mousemove(function(e){
$("#tooltip")
.css({
"top": (e.pageY+y) + "px",
"left": (e.pageX+x) + "px"
});
});
})
//]]>
</script>
</head>
<body>
<h3>有效果：</h3>
<ul>
<li><a href="images/apple_1_bigger.jpg" class="tooltip" title="苹果 iPod"><img src="images/apple_1.jpg" alt="苹果 iPod" /></a></li>
<li><a href="images/apple_2_bigger.jpg" class="tooltip" title="苹果 iPod nano"><img src="images/apple_2.jpg" alt="苹果 iPod nano"/></a></li>
<li><a href="images/apple_3_bigger.jpg" class="tooltip" title="苹果 iPhone"><img src="images/apple_3.jpg" alt="苹果 iPhone"/></a></li>
<li><a href="images/apple_4_bigger.jpg" class="tooltip" title="苹果 Mac"><img src="images/apple_4.jpg" alt="苹果 Mac"/></a></li>
</ul>
<br/><br/><br/><br/>
<br/><br/><br/><br/>
<h3>无效果：</h3>
<ul>
<li><a href="images/apple_1_bigger.jpg" title="苹果 iPod"><img src="images/apple_1.jpg" alt="苹果 iPod" /></a></li>
<li><a href="images/apple_2_bigger.jpg" title="苹果 iPod nano"><img src="images/apple_2.jpg" alt="苹果 iPod nano"/></a></li>
<li><a href="images/apple_3_bigger.jpg" title="苹果 iPhone"><img src="images/apple_3.jpg" alt="苹果 iPhone"/></a></li>
<li><a href="images/apple_4_bigger.jpg" title="苹果 Mac"><img src="images/apple_4.jpg" alt="苹果 Mac"/></a></li>
</ul>
</body>
</html>
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