js刪除select中重復(fù)項的實現(xiàn)代碼

更新時間：2010年02月18日 11:26:27 作者：

使用嵌套循環(huán)來枚舉重復(fù)項，然后移除。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>刪除select中重復(fù)項</title> <style type="text/css"> body{ text-align:center;} div{ width:400px; background:#f1f5fa; margin:auto; border:solid 1px #BFC9DB; padding:10px;} h4{ } a{text-align:right; display:block; font-size:12px;} </style> <script type="text/javascript"> /*定義全局函數(shù)$*/ function $(id){ return document.getElementById(id); } /*初始化select*/ function InitialSelectOption(id){ var oSel=$(id); var aOptions=["Wang Hongjian","Wang Hongjian","Nichoal Smith","Nichoal Smith","David Gates","David Gates","David Gates","Wang Hongjian","Wang Hongjian","Nichoal Smith","Nichoal Smith","David Gates","David Gates","David Gates"]; var i=0; oSel.options.length=0; while(i<aOptions.length){ var option=new Option(aOptions[i],i); oSel.options.add(option); i++; } oSel.setAttribute("size",i-1); $("btnDistinct").removeAttribute("disabled"); } /*刪除重復(fù)項*/ function DistinctSelectOption(id){ var oSel=$(id); var i=0; while(i<oSel.options.length){ var j=i+1; while(j<oSel.options.length){ if(oSel.options[i].text==oSel.options[j].text){ oSel.options[j]=null;//不可使用oSel.options.remove(j)，因為不兼容firefox }else{ j++; } } i++; } oSel.setAttribute("size",i); $("btnDistinct").setAttribute("disabled","disabled"); } window.onload=function(){ /*初始化*/ $("btnInital").onclick=function(){InitialSelectOption("sel");}; /*刪除重復(fù)項*/ $("btnDistinct").onclick=function(){DistinctSelectOption("sel");}; $("btnDistinct").setAttribute("disabled","disabled"); } </script> </head> <body> <div> <h4>刪除select重復(fù)項演示</h4> <a href="http://www.dhdzp.com/" target="_blank" title="http://www.dhdzp.com/">http://www.dhdzp.com/</a> <hr /> <select id="sel" multiple="multiple" size="1"><option>待初始化…</select> <hr /> <button id="btnInital">初始化</button> <button id="btnDistinct">刪除重復(fù)項</button> </div> </body> </html>

[Ctrl+A 全選注:引入外部Js需再刷新一下頁面才能執(zhí)行]

效果