本文實例講述了jsp中select的onchange事件用法。分享給大家供大家參考,具體如下:
<script language = "JavaScript"> var onecount; onecount=0; subcat = new Array(); <% int count = 0; java.sql.ResultSet rs1 = DBManage.executeQuery("select hydm,zhydm,zhymc from zhy ");//讀取數據 while(rs1.next()) { String selhydm=rs1.getString("hydm").trim(); String zhydm=rs1.getString("zhydm").trim(); String zhymc=rs1.getString("zhymc").trim(); %> subcat[<%=count%>] = new Array("<%=zhydm%>","<%=selhydm%>","<%=zhymc%>");//產生數組 <% count = count + 1; } if(rs1!=null) DBManage.closeCOnn(); %> onecount=<%=count%>; function changelocation(id) { document.form1.selzhy.length = 0; var hydm=id; var i; document.form1.selzhy.options[0] = new Option('選擇子行業分類',''); for (i=0;i < onecount; i++) { if (subcat[i][1] == hydm) { document.form1.selzhy.options[document.form1.selzhy.length] = new Option(subcat[i][2], subcat[i][0]); } } } </script> <table width="500" border="0" cellspacing="0" cellpadding="0" align="center"> <tr> <td width="180" height="20" align="right">選擇行業分類:</td> <td width="320"> <select name="selhy" onChange="changelocation(document.form1.selhy.options[document.form1.selhy.selectedIndex].value)" size="1" > <option value="2">請選擇行業分類</option> <% rs = DBManage.executeQuery("select * from hy"); while(rs.next()) { String hydm=rs.getString("hydm").trim(); String hymc=rs.getString("hymc").trim(); %> <option value="<%=hydm%>"><%=hymc%></option> <% } if(rs!=null) DBManage.closeCOnn(); %> </select> </td> </tr> <tr> <td height="20" align="right">選擇子行業分類:</td> <td> <select name="selzhy" > <option value="" selected>請選擇子行業分類</option> </select> </td> </tr> </table> <form name=form1> <select name=province onchange="cityName(this.selectedIndex)"> <option value="">請選擇省名</option> </select> <select name=city> <option value="">請選擇城名</option> </select> </form> <script language=javascript> var city1 = ["杭州", "寧波", "溫州", "紹興", "金華", "湖州"]; var city2 = ["南京", "蘇州", "無錫", "常州", "鎮江", "徐州"]; var city3 = ["合肥", "翕縣", "黃山", "祁門", "休寧"]; var city4 = ["南昌", "九江", "贛州", "上饒", "新余", "景德鎮"]; var provinceName = ["浙江", "江蘇", "安徽", "江西"]; function province() { var e = document.form1.province; for (var i=0; i<provinceName.length; i++) e.options.add(new Option(provinceName[i], provinceName[i])); } function cityName(n) { var e = document.form1.city; for (var i=e.options.length; i>0; i--) e.remove(i); if (n == 0) return; var a = eval("city"+ n); //得到城市的數組名 for (var i=0; i<a.length; i++) e.options.add(new Option(a[i], a[i])); } function window.onload() { province(); //初始時給省名下拉菜單賦內容 } </script>
希望本文所述對大家JSP程序設計有所幫助。