Javascript code to read java variable value

Question

• I have a session variable in java file.(TestConnection.java)

session.setAttribute("CONNECTION_DBNAME", dbName);

• How to read CONNECTION_DBNAME value into javascript file.(utility.js)

Answer 1

 First access the variable in scriptlet.

 <% 
    String param= (String)session.getAttribute("CONNECTION_DBNAME");
 %>

Then use like this.

  <script>
  var X = '<%=param%>';
  </script>

then you can access the name using x.

Answer 2

    <script>
<%
    String dbname=(String)session.getAttribute("CONNECTION_DBNAME");
%>  
  </script>

this code is usefull to you..

Answer 3

You can use hidden element in JSP to get the value from session like:- <textarea id="txtData" style.display='none'><%=session.getAttribute("CONNECTION_DBNAME") %></textarea>

afterwards you can get the value in your javascript by var dbConnName=document.getElementById("txtData").value;

and you are done.

Answer 4

Scriptlets were OUTLAWED more than a decade ago!

A better way... in jsp, include the values in a hidden div:

<div id="javaValues" style="display: none;">
    <div id="employee">${employee}</div>
    <div id="dept">${dept}</div>
</div>

Use <div>'s rather than <input type="hidden">, since they will not interfere with your form-postings.

In javascript (assuming jQuery) you can then access the values, for example:

    var employee = $("#employee").html().trim();
    var dept = $("#dept").html().trim();