js:
(function($) {
/**
* 默认参数
*/
var defaultOpts = {
stage: document, //舞台
item: 'resize-item', //可缩放的类名
}
/**
* 定义类
*/
var ZResize = function(options) {
this.options = $.extend({}, defaultOpts, options)
this.init()
}
ZResize.prototype = {
init: function() {
this.initResizeBox()
},
/**
* 初始化拖拽item
*/
initResizeBox: function() {
var self = this
$(self.options.item).each(function () {
//创建面板
var width = $(this).width()
var height = $(this).height()
var resizePanel = $('<div class"resize-panel"></div>')
resizePanel.css({
width: width,
height: height,
top: 0,
left: 0,
position: 'absolute',
'background-color': 'rgba(0,0,0,0.5)',
cursor: 'move',
display: 'none'
})
self.appendHandler(resizePanel, $(this))
/**
* 创建控制点
*/
var n = $('<div class="n"></div>')//北
var s = $('<div class="s"></div>')//南
var w = $('<div class="w"></div>')//西
var e = $('<div class="e"></div>')//东
var ne = $('<div class="ne"></div>')//东北
var nw = $('<div class="nw"></div>')//西北
var se = $('<div class="se"></div>')//东南
var sw = $('<div class="sw"></div>')//西南
//添加公共样式
self.addHandlerCss([n, s, w, e, ne, nw, se, sw])
//添加各自样式
n.css({
'top': '-4px',
'margin-left': '-4px',
'left': '50%',
'cursor': 'n-resize'
})
s.css({
'bottom': '-4px',
'margin-left': '-4px',
'left': '50%',
'cursor': 's-resize'
})
e.css({
'top': '50%',
'margin-top': '-4px',
'right': '-4px',
'cursor': 'e-resize'
})
w.css({
'top': '50%',
'margin-top': '-4px',
'left': '-4px',
'cursor': 'w-resize'
})
ne.css({
'top': '-4px',
'right': '-4px',
'cursor': 'ne-resize'
})
nw.css({
top: '-4px',
'left': '-4px',
'cursor': 'nw-resize'
})
se.css({
'bottom': '-4px',
'right': '-4px',
'cursor': 'se-resize'
})
sw.css({
'bottom': '-4px',
'left': '-4px',
'cursor': 'sw-resize'
})
// 添加项目
self.appendHandler([n, s, w, e, ne, nw, se, sw], resizePanel)
//绑定拖拽缩放事件
self.bindResizeEvent(resizePanel, $(this))
//绑定触发事件
self.bindTrigger($(this))
})
self.bindHidePanel()
},
//控制点公共样式
addHandlerCss: function(els) {
for(var i = 0i <els.lengthi++) {
el = els[i]
el.css({
position: 'absolute',
width: '8px',
height: '8px',
background: '#ff6600',
margin: '0',
'border-radius': '2px',
border: '1px solid #dd5500',
})
}
},
/**
* 插入容器
*/
appendHandler: function(handlers, target) {
for(var i = 0i <handlers.lengthi++) {
el = handlers[i]
target.append(el)
}
},
/**
* 显示拖拽面板
*/
triggerResize: function(el) {
var self = this
el.siblings(self.options.item).children('div').css({
display: 'none'
})
el.children('div').css({
display: 'block'
})
},
/**
* 拖拽事件控制 包含8个缩放点 和一个拖拽位置
*/
bindResizeEvent: function(el) {
var self = this
var ox = 0//原始事件x位置
var oy = 0//原始事件y位置
var ow = 0//原始宽度
var oh = 0//原始高度
var oleft = 0//原始元素位置
var otop = 0
var org = el.parent('div')
//东
var emove = false
el.on('mousedown','.e', function(e) {
ox = e.pageX//原始x位置
ow = el.width()
emove = true
})
//南
var smove = false
el.on('mousedown','.s', function(e) {
oy = e.pageY//原始x位置
oh = el.height()
smove = true
})
//西
var wmove = false
el.on('mousedown','.w', function(e) {
ox = e.pageX//原始x位置
ow = el.width()
wmove = true
oleft = parseInt(org.css('left').replace('px', ''))
})
//北
var nmove = false
el.on('mousedown','.n', function(e) {
oy = e.pageY//原始x位置
oh = el.height()
nmove = true
otop = parseInt(org.css('top').replace('px', ''))
})
//东北
var nemove = false
el.on('mousedown','.ne', function(e) {
ox = e.pageX//原始x位置
oy = e.pageY
ow = el.width()
oh = el.height()
nemove = true
otop = parseInt(org.css('top').replace('px', ''))
})
//西北
var nwmove = false
el.on('mousedown','.nw', function(e) {
ox = e.pageX//原始x位置
oy = e.pageY
ow = el.width()
oh = el.height()
otop = parseInt(org.css('top').replace('px', ''))
oleft = parseInt(org.css('left').replace('px', ''))
nwmove = true
})
//东南
var semove = false
el.on('mousedown','.se', function(e) {
ox = e.pageX//原始x位置
oy = e.pageY
ow = el.width()
oh = el.height()
semove = true
})
//西南
var swmove = false
el.on('mousedown','.sw', function(e) {
ox = e.pageX//原始x位置
oy = e.pageY
ow = el.width()
oh = el.height()
swmove = true
oleft = parseInt(org.css('left').replace('px', ''))
})
//拖拽
var drag = false
el.on('mousedown', function(e) {
ox = e.pageX//原始x位置
oy = e.pageY
otop = parseInt(org.css('top').replace('px', ''))
oleft = parseInt(org.css('left').replace('px', ''))
drag = true
})
$(self.options.stage).on('mousemove', function(e) {
if(emove) {
var x = (e.pageX - ox)
el.css({
width: ow + x
})
org.css({
width: ow + x
})
} else if(smove) {
var y = (e.pageY - oy)
el.css({
height: oh + y
})
org.css({
height: oh + y
})
} else if(wmove) {
var x = (e.pageX - ox)
el.css({
width: ow - x,
// left: oleft + x
})
org.css({
width: ow - x,
left: oleft + x
})
} else if(nmove) {
var y = (e.pageY - oy)
el.css({
height: oh - y,
// top: otop + y
})
org.css({
height: oh - y,
top: otop + y
})
} else if(nemove) {
var x = e.pageX - ox
var y = e.pageY - oy
el.css({
height: oh - y,
// top: otop + y,
width: ow + x
})
org.css({
height: oh - y,
top: otop + y,
width: ow + x
})
} else if(nwmove) {
var x = e.pageX - ox
var y = e.pageY - oy
el.css({
height: oh - y,
// top: otop + y,
width: ow - x,
// left: oleft + x
})
org.css({
height: oh - y,
top: otop + y,
width: ow - x,
left: oleft + x
})
} else if(semove) {
var x = e.pageX - ox
var y = e.pageY - oy
el.css({
width: ow + x,
height: oh + y
})
org.css({
width: ow + x,
height: oh + y
})
} else if(swmove) {
var x = e.pageX - ox
var y = e.pageY - oy
el.css({
width: ow - x,
// left: oleft + x,
height: oh + y
})
org.css({
width: ow - x,
left: oleft + x,
height: oh + y
})
} else if(drag) {
var x = e.pageX - ox
var y = e.pageY - oy
org.css({
left: oleft + x,
top: otop + y
})
}
}).on('mouseup', function(e) {
emove = false
smove = false
wmove = false
nmove = false
nemove = false
nwmove = false
swmove = false
semove = false
drag = false
})
},
/**
* 点击item显示拖拽面板
*/
bindTrigger: function(el) {
var self = this
el.on('click', function(e) {
e.stopPropagation()
self.triggerResize(el)
})
},
/**
* 点击舞台空闲区域 隐藏缩放面板
*/
bindHidePanel: function(el) {
var stage = this.options.stage
var item = this.options.item
$(stage).bind('click', function() {
$(item).children('div').css({
display: 'none'
})
})
}
}
window.ZResize = ZResize
})(jQuery)
html:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>jQuery拖拽放大缩小插件idrag</title>
<meta http-equiv="Content-Type" content="text/htmlcharset=utf-8">
<style type="text/css">
.item1 {
width: 405px
height: 291px
cursor: move
position: absolute
top: 30px
left: 30px
background-color: #FFF
border: 1px solid #CCCCCC
-webkit-box-shadow: 10px 10px 25px #ccc
-moz-box-shadow: 10px 10px 25px #ccc
box-shadow: 10px 10px 25px #ccc
}
.item2 {
width: 200px
height: 100px
cursor: move
position: absolute
top: 400px
left: 100px
background-color: #FFF
border: 1px solid #CCCCCC
-webkit-box-shadow: 10px 10px 25px #ccc
-moz-box-shadow: 10px 10px 25px #ccc
box-shadow: 10px 10px 25px #ccc
line-height: 100px
text-align: center
}
body {
background-color: #F3F3F3
}
</style>
</head>
<body>
<div id="mydiv" style="width:800pxheight:800pxborder-style:solid">
<div id="div1" class="resize-item item1">
<img src="images/dog.png" width="100%" height="100%">
</div>
<div class="resize-item item2">
你是我的小小狗
</div>
</div>
<script src="jquery.min.js"></script>
<script type="text/javascript" src='jquery.ZResize.js'></script>
<script type="text/javascript">
new ZResize({
stage: "#mydiv", //舞台
item: '#div1', //可缩放的类名
})
</script>
</body>
</html>
js改变DIV高度，首先获取到这个DIV元素，然后用style.height改变其高度即可。相关实例代码如下:
<p id="demo" onclick="Gheight()">内容</p>
<script>
function Gheight(){
var x=document.getElementById("demo")
x.offsetHeight==100?x.style.height="200px":x.style.height="100px"
}
</script>
<!DOCTYPE html><html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<style>
#div {
width: 100px
height: 50px
border: 1px solid red
color: green
text-align: center
}
input {
width: 250px
}
</style>
<script>
function test() {
var a = document.getElementById('a')
var b = document.getElementById('b')
var div = document.getElementById('div')
div.style.width = a.value + 'px'
div.style.height = b.value + 'px'
}
</script>
</head>
<body>
<div>宽度（默认100px）：<input type="text" id="a" placeholder="输入想要的宽度，点击测试看效果" /></div>
<div>高度（默认50px）：<input type="text" id="b" placeholder="输入想要的高度，点击测试看效果" /></div>
<div><button onclick="test()">点击测试</button></div>
<div id="div">来改变我</div>
</body>
</html>
