JS表格列拖动特效
本文介绍了一种使用JavaScript实现的表格列可拖动调整宽度的特效方法。通过简单的HTML结构配合JavaScript事件监听，实现了列宽调整功能，并保持了单元格内容的整洁布局。
JS表格列可拖动特效：
<!DOCTYPE html> <html> <head> <style type="text/css"> table{ border-top:solid 1px black; border-left:solid 1px black; font-size:12px; width: 100%; } th{ white-space: nowrap; } th,td{ border-right-style: solid; border-right-width: 1px; border-bottom-style: solid; border-bottom-width: 1px; height:30px; } .dragable{ width: 3px; height:100%; background-color: white; float: right; /*这个样式与效果有一定关系,其他无所谓*/ cursor: col-resize; } </style> <script type="text/javascript"> var draging = false;//是否拖拽中 var dragElement = null;//当前拖拽的th var offsetLeft = 0;//当前拖拽的th与绝对左坐标 var offsetWidth = 0;//当前拖拽的th的绝对宽度 function mousedown(){ if(draging) return; draging = true; dragElement = window.event.srcElement.parentNode; offsetLeft = dragElement.offsetLeft; document.body.style.cursor = "col-resize"; document.body.onselectstart = function(){return false;};//拖拽的时候，鼠标滑过字的时候，不让选中(默认鼠标选中字的效果,大家都知道) } function mouseup(){ draging = false; dragElement = null; document.body.style.cursor = "auto"; document.body.onselectstart = function(){return true}; } function mousemove(){ if(draging && dragElement){ var width = event.clientX-offsetLeft; if(width>0){ dragElement.style.width = width; offsetWidth = dragElement.offsetWidth; }else{ dragElement.style.width = offsetWidth; } } } </script> </head> <body onmousemove="mousemove();" onmouseup="mouseup();"> <table cellpadding="0" cellspacing="0"> <thead> <tr> <th style="width: 120px;">编号<span class="dragable" onmousedown="mousedown();"> </span></th> <th style="width: 120px;">姓名<span class="dragable" onmousedown="mousedown();"> </span></th> <th style="width: 120px;">年龄<span class="dragable" onmousedown="mousedown();"> </span></th> <th>备注</th> </tr> </thead> <tbody> <tr> <td>1</td> <td>Siuon</td> <td>100</td> <td>JavaEE工程师...</td> </tr> </tbody> </table> </body> </html>动态生成<span class="dragable" onmousedown="mousedown();"> </span>
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
table{
border-top:solid 1px black;
border-left:solid 1px black;
font-size:12px;
width: 100%;
}
th{
white-space: nowrap;
}
th,td{
border-right-style: solid;
border-right-width: 1px;
border-bottom-style: solid;
border-bottom-width: 1px;
height:30px;
}
.dragable{
width: 3px;
height:100%;
background-color: white;
float: right; /*这个样式与效果有一定关系,其他无所谓*/
cursor: col-resize;
}
</style>
<script type="text/javascript">
var draging = false;//是否拖拽中
var dragElement = null;//当前拖拽的th
var offsetLeft = 0;//当前拖拽的th与绝对左坐标
var offsetWidth = 0;//当前拖拽的th的绝对宽度
function mousedown(){
if(draging) return;
draging = true;
dragElement = window.event.srcElement.parentNode;
offsetLeft = dragElement.offsetLeft;
document.body.style.cursor = "col-resize";
document.body.onselectstart = function(){return false;};//拖拽的时候，鼠标滑过字的时候，不让选中(默认鼠标选中字的效果,大家都知道)
}
function mouseup(){
draging = false;
dragElement = null;
document.body.style.cursor = "auto";
document.body.onselectstart = function(){return true};
}
function mousemove(){
if(draging && dragElement){
var width = event.clientX-offsetLeft;
if(width>0){
dragElement.style.width = width;
offsetWidth = dragElement.offsetWidth;
}else{
dragElement.style.width = offsetWidth;
}
}
}
//创建<span class="dragable" onmousedown="mousedown();"> </span>
function createSpan(){
var span = document.createElement("span");
span.className = "dragable";
span.attachEvent("onmousedown",mousedown);
span.innerHTML = " ";
return span;
}
function init(){
//在th添加span
var ths = document.getElementsByTagName("th");
for(var i=0;i<ths.length;i++){
ths[i].appendChild(createSpan());
}
}
</script>
</head>
<body onload="init()" onmousemove="mousemove();" onmouseup="mouseup();">
<table id="mytable" cellpadding="0" cellspacing="0">
<thead>
<tr>
<th style="width: 120px;">编号</th>
<th style="width: 120px;">姓名</th>
<th style="width: 120px;">年龄</th>
<th>备注</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>Siuon</td>
<td>100</td>
<td>JavaEE工程师...</td>
</tr>
</tbody>
</table>
</body>
</html>
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