1.初次實現
1.1 html代碼
<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 drag</title> <script src="../jQuery/jquery-1.8.3.min.js" type="text/javascript"></script> </head> <body> <h1>div change width by drag</h1> <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>
1.2 js代碼
var eleLeft = $('#myDiv').offset().left; var isMouseDown = false; var borderLen = 4; //左右邊框 $('#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'); //新鼠標位置-div距左-borderLen } }, mouseup:function(e){ isMouseDown = false; } });1.3 結果
只能往左拖動使div寬度變小，往右拖動沒有用！原因往右拖動鼠標mousemove事件無法被div捕獲了。拖動時也很難停下來！所以得改進。
2.再次改進
$('#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; } });這次解決了上述問題，可以往右拖，并且隨時可以停下來了。到這里就完成了嗎？NO!
當我引入一個其他div，并且阻止mouseup事件冒泡情況怎么樣呢？答案是，拖動到這個其它div上放開鼠標后無法停止下來！
<div id="otherDiv" style="border: 2px solid blue;width: 200px;height: 200px;margin-left: 400px"></div> $('#otherDiv').mouseup(function(e){ //e.preventDefault(); //阻止默認行為 e.stopPropagation(); //阻止事件冒泡(導致body捕獲不到mouseup事件) }); 3.完美解決
拖動停止可能受到其它元素的干擾，怎么解決？想到一些彈出層點擊其它其它地方隱藏的功能，讓我想到了，加一個遮罩層，讓mouseup事件總是可以響應，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; //創建遮罩層，防止mouseup事件被其它元素阻止冒泡，導致mouseup事件無法被body捕獲，導致拖動不能停止 var bodyWidth = $('body').width(); var bodyHeight = $('body').height(); $('body').append('<div id="mask" style="opacity:0.2;top:0px;left:0px;background-color:green;position:absolute;z-index:9999;width:'+bodyWidth+'px;height:'+bodyHeight+'px;"></div>'); } } }); $('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(); //阻止默認行為 e.stopPropagation(); //阻止事件冒泡(導致body捕獲不到mouseup事件) });4.完整代碼和最終效果
<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 drag</title> <script src="../jQuery/jquery-1.8.3.min.js" type="text/javascript"></script> </head> <body> <h1>div change width by drag</h1> <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; //左右邊框 $('#myDiv').bind({ mousedown:function(e){ var ele = $(this); var rightPos = eleLeft + ele.width() + borderLen; if(rightPos-5 <= e.pageX && e.pageX <= rightPos){ isMouseDown = true; //創建遮罩層，防止mouseup事件被其它元素阻止冒泡，導致mouseup事件無法被body捕獲，導致拖動不能停止 var bodyWidth = $('body').width(); var bodyHeight = $('body').height(); $('body').append('<div id="mask" style="opacity:0.2;top:0px;left:0px;background-color:green;position:absolute;z-index:9999;width:'+bodyWidth+'px;height:'+bodyHeight+'px;"></div>'); } } }); $('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(); //阻止默認行為 e.stopPropagation(); //阻止事件冒泡(導致body捕獲不到mouseup事件) }); }); </script></html>
以上這篇鼠標拖動改變DIV等網頁元素的大小的實現方法就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持武林網。
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