要实(现带滚动条的table,定位到某个tr)其实是很简单的,只有几行js代码就可以完成。下面看看是如何实现的
js代码:
function test(){ var $objTr = $("#location"); //找到要定位的地方 tr $objTr.css("background-color","lightgray"); //设置要定位地方的css var objTr = $objTr[0]; //转化为dom对象 $("#dataDiv").animate({scrollTop:objTr.offsetTop},"slow"); //定位tr }
HTML:
<body> <h1>定位</h1> <div id="dataDiv" style="overflow-x:hidden;overflow-y:auto;height:400px;width:450px;"> <table id="tableId" style="width:400px;background-color:yellow" align="center" border="0"> <tr> <td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr <span style="color:#FF0000;">id="location"</span>><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> <tr><td>dddddddddddd</td><td>dddddddddd</td><td>ddddddddddddddddd<td/><td>dddddsererfd</td></tr> </table> </div> <input type="button" value="定位到一行" οnclick="test()"/> </body>
虽说是几行代码,但要彻底弄懂。要熟悉animate的使用,scrollTop,.offsetTop的意思方可得心应手。
1. animate的使用请参考w3c的说明:点击打开链接
2. scrollTop
scrollTop属性
有些情况下,“元素中内容”的高度会超过“元素本身”的高度, scrollTop
指的是“元素中的内容”超出“元素上边界”的那部分的高度。
通过一个实例演示来讲述scrollTop属性是什么
下面的演示中,外层元素的高度值是200px,内层元素的高度值是300px。很明显,“外层元素中的内容”高过了“外层元素”本身.当向下拖动滚动条时,有部分内容会隐没在“外层元素的上边界”之外,scrollTop
就等于这部分“不可见的内容”的高度。
(拖动滚动条,scrollTop值是变化)
<div class="演示区域"> <div id="外层元素" style="overflow:auto; width:200px; height:200px; background-color:#999999"> <div id="内层元素" style="width:100px; height:300px; background-color:#ffff00"> 这些文字显示在内层元素中。 </div> </div> <p><span id="显示外层元素的scrollTop值"><br> </span></p> </div>
解释:
- 内层元素的高度值300px > 外层元素的高度值200px,因此“外层元素的内容”(也就是“内层元素”)无法完全显示,而外层元素把overflow设置为auto,因此外层元素的右侧会出现竖直滑动条
- 初始状态下,“内层元素的上边界”和“外层元素的上边界”重合,没有任何内容超过“外层元素的上边界”,此时scrollTop属性的值为0。
- 当向下拖动滚动块时,超过“外层元素的上边界”的内容会逐渐增多,scrollTop值就等于这些超出部分的高度。
- 当拖动滚动块到最底部时,“内层元素的下边界”和“外层元素的下边界”重合,此时,超过“外层元素的上边界”的内容的高度=300px-200px=100px,也就是此时的scrollTop值。
3..offsetTop,offsetLeft等
假设 obj 为某个 HTML 控件。
obj.offsetTop 指 obj 距离上方或上层控件的位置,整型,单位像素。
obj.offsetLeft 指 obj 距离左方或上层控件的位置,整型,单位像素。
obj.offsetWidth 指 obj 控件自身的宽度,整型,单位像素。
obj.offsetHeight 指 obj 控件自身的高度,整型,单位像素。
offsetParent
offsetParent属性返回一个对象的引用,这个对象是距离调用offsetParent的元素最近的(在包含层次中最靠近的),并且是已进行过CSS定位的容器元素。 如果这个容器元素未进行CSS定位,则offsetParent属性的取值为根元素(在标准兼容模式下为html元素;在怪异呈现模式下为body元素)的引用。当容器元素的style.display 被设置为 “none”时(译注:IE和Opera除外),offsetParent属性 返回null。
句法:parentObj = element.offsetParent
变量:parentObj 是一个元素的引用,当前元素的偏移量在其中计算。
转载自:https://blog.csdn.net/zhixinhuacom/article/details/38025585
转载请注明:猫执事 » 带滚动条的table,定位到某个tr