小编典典

使用jsp和scriplets自动完成(不使用Java类)

jsp

我想进行自动完成,但不使用任何java方法。只需使用jsp,jquery,ajax和scriplets。可能吗?请提出建议。

我尝试使用下面给出的代码,但出现错误

未捕获错误:无法在初始化之前以自动完成方式调用方法;尝试调用方法“ List.jsp”

代码如下:

//(Index.jsp)

<html>
<head>

<script src = "https://code.jquery.com/jquery-1.10.2.js"></script>
<script src = "https://code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
<script>
$(document).ready(function() {
$('#country').focusin(function() {
$("#country").autocomplete("List.jsp");
});
});
</script>
</head>
<body>
    <br><br><center>
        <font face="verdana" size="2">
        <font size="4">Java(jsp)/jQuery Autocompleter Example</font>
        <br><br><br><br>

        Select Country   :
        <input type="text" id="country" name="country"/>

        </font>
    </body>
</html>

//(List.jsp)

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@page import="java.sql.*"%>
<%@page import="java.util.*"%>

<%
    try {
        String s[] = null;

        Class.forName("com.mysql.jdbc.Driver");
        System.out.println("Driver found");
        String url = "jdbc:mysql://localhost:protNum/dbName";
        String user = "";
        String pass = "";
        System.out.println("Connected....");
        Connection con = (Connection) DriverManager.getConnection(url, user, pass);
        Statement st = con.createStatement();
        ResultSet rs = st.executeQuery("select * from tbctry");

        List li = new ArrayList();

        while (rs.next()) {
            li.add(rs.getString(1));
        }

        String[] str = new String[li.size()];
        Iterator it = li.iterator();

        int i = 0;
        while (it.hasNext()) {
            String p = (String) it.next();
            str[i] = p;
            i++;
        }

        //jQuery related start
        String query = (String) request.getParameter("q");

        int cnt = 1;
        for (int j = 0; j < str.length; j++) {
            if (str[j].toUpperCase().startsWith(query.toUpperCase())) {
                out.print(str[j] + "\n");
                if (cnt >= 5)// 5=How many results have to show while we are typing(auto suggestions)
                {
                    break;
                }
                cnt++;
            }
        }
 //jQuery related end

        rs.close();
        st.close();
        con.close();

    } catch (Exception e) {
        e.printStackTrace();
    }
%>

我希望文本框在keydown时自动填充数据库中的值。我已经使用Spring
MVC做到了这一点,但是如果不使用任何Java类,而只是使用jsp,jquery,ajax和scriplets,就无法获得如何执行此操作的任何线索。请帮忙!


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2020-06-10

共1个答案

小编典典

您可以通过使用jquery
onkeyup事件来做到这一点,当用户开始在输入框中输入内容时,键入的值将传递给您的jquery函数,而通过使用ajax,您可以调用List.jsp页面并使用来获取该值request.getParameter(""),最后在查询中传递该值并返回结果使用out.print如下:

输入 ie:将在其中键入值的位置:

    Select Country   :  <input type="text" id="country" name="country"/>
  //here result will be display
    <div id="result"></div>

jQuery和Ajax

 <script>
     $('#country').keyup(function(){
       //getting typed value
            var searchid=$(this).val();
               if(searchid!='')
                     {
                        $.ajax({
                           type:"POST",
                            url:"List.jsp",
                            //passing value
                             data:{search:searchid},
                             success:function(html){
                            //response from List.jsp page will come here                                       
                                $('#result').html(html);
                            }
                         });
                         } 
                   });
        </script>

List.jsp页面

//getting value passed from ajax
 String search = (String) request.getParameter("search");
//db setting
      try{
        Class.forName("com.mysql.jdbc.Driver");
        System.out.println("Driver found");
        String url = "jdbc:mysql://localhost:protNum/dbName";
        String user = "";
        String pass = "";
        System.out.println("Connected....");
        Connection con = (Connection) DriverManager.getConnection(url, user, pass);
          //below columnanme is fieldname from where you need to compare your search value.
        PreparedStatement pstmt = con.prepareStatement(
         "select * from tbctry where columnname LIKE ?");
         pstmt.setString(1, search + "%");
         ResultSet rs=pstmt.executeQuery();  
         while(rs.next()){ 
        //here you need to print values which you need to show in div 
         out.print("something"); 
          }
        rs.close();
    pstmt.close();
    con.close();

} catch (Exception e) {
    e.printStackTrace();
}

希望这可以帮助 !

2020-06-10