table表头和⾸列的表格固定-JQuery、js实现的Table表头固定
这个是最简单的⽅法，基于jQuery的解决⽅案，引⼊⼀个两个js就可以解决，当然也有使⽤css，
position: sticky，这个我下⼀章节会讲它的优缺点，当然为了凸显jQuery的优点，
我就说话使⽤css的缺点：
1.固定表头，和⾸列需要额外的html，结构复杂。
2.体验效果，响应式布局很难解决，⼏乎没有解决
，table固定了长宽，在其他页⾯会看到很别扭，影响美观。
3.遇到bug，如果你是后端开发就需要前端⼀点⼀点调样式，后端噩梦，影响开发效率
现在开始介绍JQuery的思路：
步骤1：克隆元素
在我们开始之前，我们将要关闭表头，并声明⼀些变量
//声明屏幕、当前table
var $ t = $（this），
$ w = $（window），
$ thead = $（this）.find（'thead'）.clone（），
$ col = $（this）.find（'thead，tbody'）.clone（）;
步骤2：创建新表
步骤3：插⼊克隆后的表格内容
步骤4：通过scrollTop算滚动⾼度来显⽰新表
算了还是长话短说，不说原理了，具体js代码等下回帖出来，不懂的可以直接问我，直接看看怎么使⽤吧。
第⼀步引⼊js
jquery.stickyheader.js
//可以去这⾥下载⾃⼰重新创建⼀个
<script src="cdnjs.cloudflare/ajax/libs/jquery-throttle-debounce/1.1/jquery.ba-throttle-debounce.min.js"></script>第⼆步html中table结构
<table>
<thead>
<tr>
<!-- 固定表头是th⾥⾯的内容 -->
<th></th>
</tr>
</thead>
<tbody>
<tr>
<!-- 如果你需要列表的第⼀列也固定 -->
<!-- <th></th> 使⽤这种模式⽀持rowspan -->
jquery框架原理<td></td>
</tr>
<!-- more rows are possible -->
</tbody>
</table>
css
.sticky-wrap {
overflow-x: auto;
position: relative;
margin-bottom: 1.5em;
width: 100%;
}
.sticky-wrap .sticky-thead,
.sticky-wrap .sticky-col,
.sticky-wrap .sticky-intersect {
opacity: 0;
position: absolute;
top: 0;
left: 0;
transition: all .125s ease-in-out;
z-index: 50;
width: auto; /* Prevent table from stretching to full size */
}
.sticky-wrap .sticky-thead {
box-shadow: 0 0.25em 0.1em -0.1em rgba(0,0,0,.125);
z-index: 100;
width: 100%; /* Force stretch */
}
.sticky-wrap .sticky-intersect {
opacity: 1;
z-index: 150;
}
.sticky-wrap .sticky-intersect th {
background-color: #666;
color: #eee;
}
.sticky-wrap td,
.sticky-wrap th {
box-sizing: border-box;
}
第三步打开浏览器看效果吧
1.
2.
3.
jquery-throttle-debounce-plugin.js
(function(b,c){var $=b.jQuery||b.Cowboy||(b.Cowboy={}),a;$.throttle=a=function(e,f,j,i){var h,d=0;if(typeof f!=="boolean"){i=j;j=f;f=c}function g(){var o=this,m =+new Date()-d,n=arguments;function l(){d=+new Date();j.apply(o,n)}function k(){h=c}if(i&&!h){l()}h&&clearTimeout(h);if(i===c&&m>e){l()}else{if(f!==true){h =setTimeout(i?k:l,i===c?e-m:e)}}}if($.guid){g.guid=j.guid=j.guid||$.guid++}return g};$.debounce=function(d,e,f){return f===c?a(d,e,false):a(d,f,e!==false)}})(t his);
jquery.stickyheader.js
$('table').each(function() {
if($(this).find('thead').length > 0 && $(this).find('th').length > 0) {
// 克隆<thead>
var $w    = $(window),
$t    = $(this),
$thead = $t.find('thead').clone(),
$col  = $t.find('thead, tbody').clone();
// Add class, remove margins, reset width and wrap table
$t
.addClass('sticky-enabled')
.css({
margin: 0,
width: '100%'
}).wrap('<div class="sticky-wrap" />');
if($t.hasClass('overflow-y')) $t.removeClass('overflow-y').parent().addClass('overflow-y');
// Create new sticky table head (basic)
$t.after('<table class="sticky-thead table" />');
// If <tbody> contains <th>, then we create sticky column and intersect (advanced)
if($t.find('tbody th').length > 0) {
$t.after('<table class="sticky-col table" /><table class="sticky-intersect" />');
}
// Create shorthand for things
var $stickyHead  = $(this).siblings('.sticky-thead'),
$stickyCol  = $(this).siblings('.sticky-col'),
$stickyInsct = $(this).siblings('.sticky-intersect'),
$stickyWrap  = $(this).parent('.sticky-wrap');
$stickyHead.append($thead);
$stickyCol
.append($col)
.find('thead th:gt(0)').remove()
.end()
.find('tbody td').remove();
$stickyInsct.html('<thead><tr><th>'+$t.find('thead th:first-child').html()+'</th></tr></thead>');
// 设置宽度
var setWidths = function () {
$t
.find('thead th').each(function (i) {
$stickyHead.find('th').eq(i).width($(this).width());
})
.end()
.find('tr').each(function (i) {
$stickyCol.find('tr').eq(i).height($(this).height());
});
// Set width of sticky table head
$stickyHead.width($t.width());
// Set width of sticky table col
$stickyCol.find('th').add($stickyInsct.find('th')).width($t.find('thead th').width())
},
repositionStickyHead = function () {
// Return value of calculated allowance
var allowance = calcAllowance();
// Check if wrapper parent is overflowing along the y-axis
// Check if wrapper parent is overflowing along the y-axis
if($t.height() > $stickyWrap.height()) {
// If it is overflowing (advanced layout)
// Position sticky header based on wrapper scrollTop()
if($stickyWrap.scrollTop() > 0) {
/
/ When top of wrapping parent is out of view
$stickyHead.add($stickyInsct).css({
opacity: 1,
top: $stickyWrap.scrollTop()
});
} else {
// When top of wrapping parent is in view
$stickyHead.add($stickyInsct).css({
opacity: 0,
top: 0
});
}
} else {
// If it is not overflowing (basic layout)
// Position sticky header based on viewport scrollTop
if($w.scrollTop() > $t.offset().top && $w.scrollTop() < $t.offset().top + $t.outerHeight() - allowance) {                                    // When top of viewport is in the table itself
$stickyHead.add($stickyInsct).css({
opacity: 1,
top: $w.scrollTop() - $t.offset().top
});
} else {
// When top of viewport is above or below table
$stickyHead.add($stickyInsct).css({
opacity: 0,
top: 0
});
}
}
},
repositionStickyCol = function () {
if($stickyWrap.scrollLeft() > 0) {
// When left of wrapping parent is out of view
$stickyCol.add($stickyInsct).css({
opacity: 1,
left: $stickyWrap.scrollLeft()
});
} else {
// When left of wrapping parent is in view
$stickyCol
.css({ opacity: 0 })
.add($stickyInsct).css({ left: 0 });
}
},
calcAllowance = function () {
var a = 0;
// Calculate allowance
$t.find('tbody tr:lt(3)').each(function () {
a += $(this).height();
});
// Set fail safe limit (last three row might be too tall)
// Set arbitrary limit at 0.25 of viewport height, or you can use an arbitrary pixel value
if(a > $w.height()*0.25) {
a = $w.height()*0.25;
}
// Add the height of sticky header
a += $stickyHead.height();
return a;
};

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