最开始想每个方法中用一个循环搞定，后来发现循环删除后。options的索引和集合就发生了变化，删除就不成功。有时候还出现selected为空的现象，2个循环就over了； <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>addMulitOptions.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <script type="text/javascript"> function moveLeft() { var lBox = document.getElementById("leftBox"); var rBox = document.getElementById("rightBox"); var count = 0;; for (var i = 0, len = lBox.length; i < len; i++) { if (lBox[i].selected) { rBox.options.add(new Option(lBox.options[i].text, lBox[i].value)); count++; } } for (var i = 0; i < count; i++) { lBox.remove(lBox.selectedIndex); } } function moveRight() { var lBox = document.getElementById("leftBox"); var rBox = document.getElementById("rightBox"); var count = 0;; for (var i = 0, len = rBox.length; i < len; i++) { if (rBox[i].selected) { lBox.options.add(new Option(rBox.options[i].text, rBox[i].value)); count++; } } for (var i = 0; i < count; i++) { rBox.remove(rBox.selectedIndex); } } </script> </head> <body> <select id="leftBox" multiple="multiple" style="height: 200px; width: 100px;"> <option value="1">a</option> <option value="2">b</option> <option value="3">c</option> <option value="4">d</option> </select> <input type="button" value=">>" onclick="moveLeft()"/> <input type="button" value="<<" onclick="moveRight()"/> <select id="rightBox" multiple="multiple" style="height: 200px; width: 100px;"> <option value="11">A</option> <option value="22">B</option> <option value="33">C</option> <option value="44">D</option> </select> </body> </html>
posted on 2010-07-20 12:16 java课程设计 阅读(311) 评论(0) 编辑 收藏 举报
