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Question

我必须在我的java scriplet中传递此processID，以便我可以根据特定ID查询数据库。 processID来自下拉列表的onchange功能。但我无法做到这一点。

<script>
function load_division(processID){

    var id = processID.toString();

    <% String connectionUrl = "jdbc:oracle:thin:@PRA:1540:";
        String dbName = "System";
        String userId = "Prakhar";
        String password = "PS#5QW8";
        %> 
    <% String i%>= id; //giving Error
        PreparedStatement statement2 = null;
        ResultSet divSet = null;
    try {
        Connection connection1 = DriverManager.getConnection(
            connectionUrl + dbName, 
            userId, 
            password
        );
        statement2 = connection1.prepareStatement(
            "SELECT distinct ID, " + 
            "Name FROM process_group " + 
            "WHERE ID =" + i + 
            " ORDER BY name"
        );
        divSet = statement2.executeQuery();
    } 
    catch (Exception e) 
    {
        e.printStackTrace();
    }%>

    var x = document.getElementById("division");
    var option = document.createElement("option"); 
    var docfrag = document.createDocumentFragment();
    <% while (divSet.next()) {

        divSet.getInt("ID");%>
        docfrag.appendChild(new Option(
            "<%=divSet.getString("Name")%>",
            "<%=divSet.getInt("ID")%>"
        ));

        x.appendChild(docfrag);
    <%}%>    
}
</script>

Answer 1

您无法直接拨打服务器电话。您需要发出服务器请求。

javascript在客户端播放，JSP在服务器端播放。

您需要做出服务器请求。并将该字符串作为查询参数发送。

实现这一目标的两个选择。

HTML表单

Sample.html

请告诉我你自己

<form action="SimpleFormHandler.jsp" method="get">

Name: <input type="text" name="firstName">
  <input type="text" name="lastName"><br>
Sex:
  <input type="radio" checked name="sex" value="male">Male
  <input type="radio" name="sex" value="female">Female
<p>
What Java primitive type best describes your personality:
<select name="javaType">
  <option value="boolean">boolean</option> 
  <option value="byte">byte</option> 
  <option value="char" selected>char</option> 
  <option value="double">double</option> 
  <option value="float">float</option> 
  <option value="int">int</option> 
  <option value="long">long</option> 
</select>
<br>
<input type="submit">
</form>
</body>
</html>

SampleFormHandler.jsp

<html>
<body>

<%

// Grab the variables from the form.
  String firstName = request.getParameter("firstName");
  String lastName = request.getParameter("lastName");
  String sex = request.getParameter("sex");
  String javaType = request.getParameter("javaType");
%>
<%-- Print out the variables. --%>
<h1>Hello, <%=firstName%> <%=lastName%>!</h1>
I see that you are <%=sex%>. You know, you remind me of a
<%=javaType%> variable I once knew.

</body>
</html>

的Ajax。

使用post发送数据并将结果放入div

$.ajax({
  url: "/YourServlet",
  type: "post",
  data: values,
  success: function(){
      alert("success");
       $("#result").html('submitted successfully');
  },
  error:function(){
      alert("failure");
      $("#result").html('there is error while submit');
  }   
});

不要混淆同一文档（或文件）上存在的JSP和java脚本。是的，但JSP部分在服务器端编译，JavaScript由浏览器执行。

如何在jsp中将javascript变量传递给java scriplet

1 个答案:

请告诉我你自己