Question

我在这里插入了我的代码。我想要做的是当用户在“阶段”菜单中选择一个选项时，应该动态生成活动菜单。这段代码运行正常，但是当我从阶段菜单中选择一个选项时在onchange函数中显示错误G（）未定义。

＆＃13;

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1" import ="org.indresh.javanet.Employee"
    import="org.indresh.javanet.Database" import="org.indresh.javanet.MySqlConnector"
    import="java.util.HashMap" import="java.util.ArrayList" import="java.util.HashSet"
    import="java.util.Arrays" import="java.util.Iterator" import="java.util.Set"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript">
		var create=0;
		function G(){
			if (create == 1) {
                removeDrop();
            }
			
			var a=document.getElementById('phase1');
			
			var wheretoput=document.getElementById('acc');
			var createselect=document.createElement('select');
			createselect.setAttribute('name',"Activity");
			wheretoput.appendChild(createselect);
			ArrayList<String> act=new ArrayList<String>();
			act=actpha.get(a);
			
			for(var i=0;i<act.length;i++){
				var createoption=document.createElement('option');
				createoption.text=act.get(i);
				createoption.value=act.get(i);
				createselect.add(createoption,createselect.options[null]);
				}
				create = 1; 
		}
		function removeDrop() {
            var d = document.getElementById('acc');

            var oldmenu = document.getElementByName('Activity');

            d.removeChild(oldmenu);
        }
		function timesheetrecorded(){
			alert("Your TimeSheet has been recorded");
		}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <meta charset="UTF-8">
<title>Employee TimeLine</title>
<meta name="description" content="Description of your site goes here">
  <meta name="keywords" content="keyword1, keyword2, keyword3">
  <link href="css/style.css" rel="stylesheet" type="text/css">
  
</head>
<body>
<%Employee e=(Employee)session.getAttribute("Employee"); 
		String[][] phaseactivity;
		Boolean temp=(Boolean)session.getAttribute("Manager");
		int i;
		ArrayList<String> pid=new ArrayList<String>();
		Database db=new Database();
		MySqlConnector scon=new MySqlConnector();
		HashMap<String,String> pr=new HashMap<String,String>();
		pr=db.getProjects(scon);
		pid=db.getAllProjectID(scon);
		HashMap<String,ArrayList<String>> actpha=new HashMap<String,ArrayList<String>>();
		actpha=db.getphaseactivity(scon);
		Set<String> phases=new HashSet<String>();
		phases=actpha.keySet();
		ArrayList<String> ph=new ArrayList<String>();
		Iterator it=phases.iterator();
		while(it.hasNext()){
			ph.add((String)it.next());
		}
		%>	
<div class="main-out">
<div class="main">
<div class="page">
<div class="top">
<div class="header">
<div class="header-top">
<h1><span>Drivedge</span></h1>
<p>Call Us: +91 (0)20 65231515.</p>
<div class="namename">
<p>Hello <%=e.getEmployeeName() %></p></div>
</div>
</div>
<div class="topmenu">
<ul>
  <li><%if(temp){%><a href="AddEmployeeToProject.jsp"><button type="button">Add Employees to your Project</button></a><%} %>
		<a href="logout.jsp"><button type="button">LogOut</button></a></li>
</ul>
</div>
<div class="header-img">

</div>
</div>
<div class="content">
<div class="content-left">
<div class="row1">


</div>
<div class="row2">

<form name="form1" action="timesheet" method="get" onSubmit="timesheetrecorded()">
		<div Class="project">
		Select Project:<select name="Project">
		<option value="">--</option>
			<%for(i=0;i<pr.size();i++){%>
			<option value="<%=pid.get(i)%>"><%=pr.get(pid.get(i)) %></option><%} %>
		</select></div>
		<div class="phase">
		Select Phase:<select name="Phase" id="phase1" onchange="G()">
		<option value="">--</option>
		<%for(String p:ph){%>
			<option value="<%=p%>"><%=p %></option><%} %>
		</select></div>
		<div class="activity" id="acc">
		Activity:</div>
		<div class="date">Date:<input type="date" name="date" format="yyyymmdd"/></div>
		<div class="time">
		Time Devoted(Hrs):<input type="text" name="time"/></div>
		<div class="submit2">
		<input type="submit" name="Submit" onclick="timesheetrecorded()"/></div>
		
	</form>

</div>
</div>
<div class="content-right">

</div>
</div>
</div>
<div class="bottom">

</div>
</div>
</div>
</body>
</html>

＆＃13;

Answer 1

我认为此链接可能对您有所帮助

Reading a JSP variable from JavaScript

从该问题复制的答案

<html> 
<head>
<script language="javascript"> 

function access(){ 
  <% String str="Hello World"; %>
   var s="<%=str%>"; 
   alert(s); 
} 

</script> 
</head> 

<body onload="access()"> 
</body> 

</html>

将您的ArrayList放入任何jSP变量

<%=ArrayList<String> act=new ArrayList<String>();
            act=actpha.get(a); %>

之后将该变量用于JS

 var jsact="<%=act%>";

从那里你的代码工作正常。此代码可能并不完美，但它可能会对您有所帮助。

将下拉列表动态添加到jsp页面

1 个答案: