javascript - Dynamically change JSP page content without buttons -


i've written code dynamically fills drop down list sql database. next, need change content of page depending on user selection in real-time (no buttons), perhaps show label, or show drop down list gets it's values sql db depending on previous selection etc.. here code

<%@ page import="java.sql.*" %> <%resultset resultset = null; connection conn;%> <html> <%     try {         class.forname("com.microsoft.sqlserver.jdbc.sqlserverdriver").newinstance();         conn = drivermanager.getconnection("jdbc:sqlserver://desktop-o708f3g\\sqlexpress;databasename=master",                 "user", "pswd");          statement statement = conn.createstatement();          resultset = statement.executequery("select * rtable"); %> <h1> drop down list</h1>     <select name="projectname">         <%  while (resultset.next()) {%>         <option><%= resultset.getstring(2)%></option>         <% } %>     </select> <%     } catch (exception e) {         out.println("error"+e);     } %> </html>

after selections done, display "submit" button sends selected data back-end servlet (i know how once button there).

you can write following javascript function , call on onchange event of <select> element:

    <p id="demo"></p>      <script>     function myfunction() {         var x = document.getelementbyid("myselect").value;         document.getelementbyid("demo").innerhtml = "you selected: " + x;     }     </script> //your jsp code     <select name="projectname" id="myselect" onchange="myfunction()">         <%  while (resultset.next()) {%>         <option value="<%= resultset.getstring(2)%>"><%= resultset.getstring(2)%></option>         <% } %>     </select>

please check code value attribute of <option>, might wrong; other code work fine. have added 'id' , 'onchange' attributes <select> tag.


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