(function ($) {
$.fn.resizetable = function () {
var tableObj = $(this);
var inResizeRange = false; //鼠标移到可调整范围内为true
var inResizeRangeLClicked = false; //鼠标在可调整范围内右键按下为true
var inResizing = false; //开始调整大小时为true(鼠标在可调整范围内，并按下右键)
var resizeDiv; //用来显示当前位置的div
var nowThObj; //当前正在调整的th
var dragDirection; //0 left, 1 right
//如果可调整大小，需要将talbe宽度设置为固定数字，这样在调整大小后，整个表格的大小也需要调整
var ths = tableObj.find("th");
for (var i = 0; i < ths.length; i++) {
$(ths[i]).width($(ths[i]).width());
}
tableObj.css("width", tableObj.width());
tableObj.find("th").mousemove(function (e) {
//鼠标在TH移动时，如果在边界范围则将鼠标改成可移动图标（边界范围是在边界的左右2px内）
var pos = $(this).position();
var width = $(this).width();
if (!inResizeRange) {
if (pos.left + width - 2 <= e.clientX) {
$(this).css("cursor", "col-resize");
inResizeRange = true;
nowThObj = this;
dragDirection = 1;
}
if (e.clientX - 2 <= pos.left + 2) {
if (this.cellIndex == 0) return;
$(this).css("cursor", "col-resize");
inResizeRange = true;
nowThObj = this;
dragDirection = 0;
}
}
if (!inResizing) {
if (!(pos.left + width - 2 <= e.clientX || e.clientX - 2 <= pos.left + 2)) {
$(this).css("cursor", "");
inResizeRange = false;
}
}
}).mousedown(function (e) {
//在可迁移范围内按下鼠标右键，创建可移动的div
if (e.button <= 1 && inResizeRange) {
inResizeRangeLClicked = true;
var pos = $(this).position();
createDragDiv(e.clientX, pos.top);
}
});
$("body").mousemove(function (e) {
//移动鼠标，显示当前位置
if (inResizeRange && inResizeRangeLClicked) {
$(this).css("cursor", "col-resize");
resizeDiv.css("left", e.clientX);
}
}).mouseup(function (e) {
//鼠标右键弹起，调整TH宽度，并释放资源
if (e.button <= 1 && inResizeRange) {
adjustWidth(e);
inResizeRangeLClicked = false;
destroy();
}
});
//创建显示调整位置的DIV
function createDragDiv(posLeft, posTop) {
resizeDiv = $("<div style='position:absolute; width:2px; height:50px; background-color:gray;'></div>");
resizeDiv.appendTo("body").css({ "left": posLeft, "top": posTop });
inResizing = true;
}
//重置各标识变量，释放div
function destroy() {
inResizeRange = false;
inResizeRangeLClicked = false;
$("body").css("cursor", "");
resizeDiv.remove();
inResizing = false;
}
//调整TH大小
function adjustWidth(e) {
var resizeWidth = 0;
if (dragDirection == 0) {
//left
resizeWidth = e.clientX - $(nowThObj).position().left;
$(nowThObj).prev("th").width($(nowThObj).prev("th").width() + resizeWidth);
} else {
//right
resizeWidth = e.clientX - ($(nowThObj).position().left + $(nowThObj).width());
$(nowThObj).width($(nowThObj).width() + resizeWidth);
}
tableObj.width(tableObj.width() + resizeWidth);
}
};
})(jQuery)
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<script src="jquery-1.9.1.min.js"></script>
<script src="jquery.resizetable.js"></script>
<script type="text/javascript">
$(function () {
$("#tableTest").resizetable();
});
</script>
<style type="text/css">
table th,td {
border: 1px solid black;
}
body {
-moz-user-select: none;
-webkit-user-select: none;
user-select: none;
}
</style>
</head>
<body>
<table id="tableTest" cellpadding="0" cellspacing="0" style="border-collapse:collapse; width:100%;">
<tr>
<th>列1</th>
<th>列2</th>
<th>列3</th>
</tr>
<tr>
<td>cell 1</td>
<td>cell 2</td>
<td>cell 3</td>
</tr>
</table>
</body>
</html>
