CODEWITHSUNDEEP
javajspservlets
user63762453
user63762453

Reputation: 1734

Filling the html form fields through servlets

So the question is like we manipulate the values of the form fields through servlets by using request.getParameter() can we do the other way round i.e set the form feild values fromthe servlet itself?

Basically what I am trying to do is to create a dropdown and some textboxes. the dropdown gets the ids from the database , when user selects a particular id, the text boxes should get filled with the other values from database for that id so the user can either edit them or leave unchanged accordingly.

For ex: The html code is:

 <form action="GetValues">
<select name="ids"><option>1</option><option>2</option></select>
<input type="submit" value="Edit">
</form>
<form action="Save">
    Product name:<input type="text" name="name" id="tb1"/></br>
Price:<input type="text" name="price" id="tb1"/>

<input type="submit" value="Save">
</form>

The Getvalues servlet establishes the database connection and gets the values of name and price from the datbase which I can do, but how to display those values in the two textboxes?

I can than make the Save.java servlet to get the values from textfields and update into the database.

I am not at all comfortable using JSP scriptlets. I want to do this using servlets only.

I know I could have created textboxes using the servlet itself but that won't work for me because that makes my jquery on the form die.

Like we do in javascript:

var x="hii";
document.getElementById("tb1").value=x;

Is there anything like this in Java too?

Upvotes: 0

Views: 3874

Answers (2)

cleiva36
cleiva36

Reputation: 41

I know you requested no scriptlets, but IMO this is the easiest way to do it.

In your servlet, set a request attribute as such:

request.setAttribute("attributeName", attributeValue);

Then in your jsp, you can access the attributeValue like this:

<%= request.getAttribute("attributeName") >

Edit: For the followup question in the comment, here is how you can show the IDs in the select box using scriptlets:

First, set the list of IDs in the servlet:

List<String> idList = ...;
request.setAttribute("idList", list);

Then in your JSP, construct the select field as follows:

<select name="ids">
  <% 
    List<String> idList = request.getAttribute("idList");
    for(String id : idList) {
  %>
      <option><%=id></option>
  <%
    }
  %>
</select>

Upvotes: 1

Suresh Atta
Suresh Atta

Reputation: 121998

. the dropdown gets the ids from the database , when user selects a particular id, the text boxes should get filled with the other values from database for that id so the user can either edit them or leave unchanged accordingly.

That is the perfect place to use a AJAX call. Please fire a AJAX request and get the values from Database.

Upvotes: 0

Related Questions