1.初次实现

1.1 html代码

div change width by drag

div change width by drag

1.2 js代码

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;

}

},

mousemove:function(e){

var ele = $(this);

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'); //新鼠标位置-div距左-borderLen

}

},

mouseup:function(e){

isMouseDown = false;

}

});

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

$('#myDiv').bind({

mousedown:function(e){

var ele = $(this);

var rightPos = eleLeft + ele.width() + borderLen;

if(rightPos-5 <= e.pageX && e.pageX <= 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 <= 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;

}

});

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！

$('#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)

});

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！

$('#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)

});

4.完整代码和最终效果

div change width by drag

div change width by drag

$(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)

});

});

以上这篇鼠标拖动改变DIV等网页元素的大小的实现方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。