鼠标拖动改变DIV等网页元素的大小的最佳实践
2021-07-03 15:04
标签：没有 sem tde 情况 鼠标 down stop 边框 引入 1.初次实现 1.1 html代码 1.2 js代码 1.3 结果 只能往左拖动使div宽度变小，往右拖动没有用！原因往右拖动鼠标mousemove事件无法被div捕获了。拖动时也很难停下来！所以得改进。 2.再次改进 这次解决了上述问题，可以往右拖，并且随时可以停下来了。到这里就完成了吗？NO! 当我引入一个其他div，并且阻止mouseup事件冒泡情况怎么样呢？答案是，拖动到这个其它div上放开鼠标后无法停止下来！ 3.完美解决 拖动停止可能受到其它元素的干扰，怎么解决？想到一些弹出层点击其它其它地方隐藏的功能，让我想到了，加一个遮罩层，让mouseup事件总是可以响应，不就搞定了嘛！ 4.完整代码和最终效果 鼠标拖动改变DIV等网页元素的大小的最佳实践 标签：没有 sem tde 情况 鼠标 down stop 边框 引入 原文地址：http://www.cnblogs.com/hdwang/p/7123784.htmlhtml xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
head>
meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
title>div change width by dragtitle>
script src="../jQuery/jquery-1.8.3.min.js" type="text/javascript">script>
head>
body>
h1>div change width by dragh1>
div id="pos" style="color:red">div>
div id="myDiv" style="border:2px solid red;width:300px;height:50px;margin-left: 100px;margin-top: 20px">div>
body>
html>
var eleLeft = $(‘#myDiv‘).offset().left;
var isMouseDown = false;
var borderLen = 4; //左右边框
$(‘#myDiv‘).bind({
mousedown:function(e){
var ele = $(this);
var rightPos = eleLeft + ele.width() + borderLen;
if(rightPos-5 rightPos){
isMouseDown = true;
}
},
mousemove:function(e){
var ele = $(this);
var rightPos = eleLeft + ele.width() + borderLen;
$(‘#pos‘).text("x:"+e.pageX + " eleLeft:"+eleLeft+" rightPos:"+rightPos);
if(rightPos-5 rightPos){
ele.css(‘cursor‘,‘e-resize‘);
}else{
if(!isMouseDown){
ele.css(‘cursor‘,‘auto‘);
}
}
if(isMouseDown){
ele.width((e.pageX-eleLeft-borderLen)+‘px‘); //新鼠标位置-div距左-borderLen
}
},
mouseup:function(e){
isMouseDown = false;
}
});
$(‘#myDiv‘).bind({
mousedown:function(e){
var ele = $(this);
var rightPos = eleLeft + ele.width() + borderLen;
if(rightPos-5 rightPos){
isMouseDown = true;
}
}
});
$(‘body‘).bind({
mousemove:function(e){
var ele = $(‘#myDiv‘);
var rightPos = eleLeft + ele.width() + borderLen;
$(‘#pos‘).text("x:"+e.pageX + " eleLeft:"+eleLeft+" rightPos:"+rightPos);
if(rightPos-5 rightPos){
ele.css(‘cursor‘,‘e-resize‘);
}else{
if(!isMouseDown){
ele.css(‘cursor‘,‘auto‘);
}
}
if(isMouseDown){
ele.width((e.pageX-eleLeft-borderLen)+‘px‘);
}
},
mouseup:function(e){
isMouseDown = false;
}
});
div id="otherDiv" style="border: 2px solid blue;width: 200px;height: 200px;margin-left: 400px">div>
$(‘#otherDiv‘).mouseup(function(e){
//e.preventDefault(); //阻止默认行为
e.stopPropagation(); //阻止事件冒泡(导致body捕获不到mouseup事件)
});
$(‘#myDiv‘).bind({
mousedown:function(e){
var ele = $(this);
var rightPos = eleLeft + ele.width() + borderLen;
if(rightPos-5 rightPos){
isMouseDown = true;
//创建遮罩层，防止mouseup事件被其它元素阻止冒泡，导致mouseup事件无法被body捕获，导致拖动不能停止
var bodyWidth = $(‘body‘).width();
var bodyHeight = $(‘body‘).height();
$(‘body‘).append(‘‘);
}
}
});
$(‘body‘).bind({
mousemove:function(e){
var ele = $(‘#myDiv‘);
var rightPos = eleLeft + ele.width() + borderLen;
$(‘#pos‘).text("x:"+e.pageX + " eleLeft:"+eleLeft+" rightPos:"+rightPos);
if(rightPos-5 rightPos){
ele.css(‘cursor‘,‘e-resize‘);
}else{
if(!isMouseDown){
ele.css(‘cursor‘,‘auto‘);
}
}
if(isMouseDown){
ele.width((e.pageX-eleLeft-borderLen)+‘px‘);
}
},
mouseup:function(e){
isMouseDown = false;
$(‘#mask‘).remove();
}
});
$(‘#otherDiv‘).mouseup(function(e){
//e.preventDefault(); //阻止默认行为
e.stopPropagation(); //阻止事件冒泡(导致body捕获不到mouseup事件)
});
html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
head>
meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
title>div change width by dragtitle>
script src="../jQuery/jquery-1.8.3.min.js" type="text/javascript">script>
head>
body>
h1>div change width by dragh1>
div id="pos" style="color:red">div>
div id="myDiv" style="border:2px solid red;width:300px;height:50px;margin-left: 100px;margin-top: 20px">div>
div id="otherDiv" style="border: 2px solid blue;width: 200px;height: 200px;margin-left: 400px">div>
body>
script type="text/javascript">
$(document).ready(function(){
var eleLeft = $(‘#myDiv‘).offset().left;
var isMouseDown = false;
var borderLen = 4; //左右边框
$(‘#myDiv‘).bind({
mousedown:function(e){
var ele = $(this);
var rightPos = eleLeft + ele.width() + borderLen;
if(rightPos-5 e.pageX && e.pageX rightPos){
isMouseDown = true;
//创建遮罩层，防止mouseup事件被其它元素阻止冒泡，导致mouseup事件无法被body捕获，导致拖动不能停止
var bodyWidth = $(‘body‘).width();
var bodyHeight = $(‘body‘).height();
$(‘body‘).append(‘‘);
}
}
});
$(‘body‘).bind({
mousemove:function(e){
var ele = $(‘#myDiv‘);
var rightPos = eleLeft + ele.width() + borderLen;
$(‘#pos‘).text("x:"+e.pageX + " eleLeft:"+eleLeft+" rightPos:"+rightPos);
if(rightPos-5 e.pageX && e.pageX rightPos){
ele.css(‘cursor‘,‘e-resize‘);
}else{
if(!isMouseDown){
ele.css(‘cursor‘,‘auto‘);
}
}
if(isMouseDown){
ele.width((e.pageX-eleLeft-borderLen)+‘px‘);
}
},
mouseup:function(e){
isMouseDown = false;
$(‘#mask‘).remove();
}
});
$(‘#otherDiv‘).mouseup(function(e){
//e.preventDefault(); //阻止默认行为
e.stopPropagation(); //阻止事件冒泡(导致body捕获不到mouseup事件)
});
});
script>
html>
