Develop Reference

change table based on selected value from database in JSP

I need to change the values displayed in the timetable based on the room I select from the dropdown list but I don't know how to do it.
The code for dropdown list is:
select option list
And on the same page, the code for the timetable:
timetable JSP page
Right now it shows all values from the database regardless of the selected room.

AJAX(Asynchronous Javascript and XML) can do this for you. AJAX allows for the updating of contents within an HTML object without reloading the page. W3Schools and the JQuery reference both have lots of helpful info on the matter.

How to set jcombo box to what i want

I am doing a home work for my class in java, i am using NetBeans.
When the frame opened i want that my combo box load data that is exactly to my database column.
Exp... On my 7 column on my data base there's a column name that's name Color, and on the list of column there's yellow. I want that my jCombobox load with Yellow and get's all the others color on the model.
Here is my code
private void formWindowOpened(java.awt.event.WindowEvent evt) {
txt_id.setText(user);
SQLiteConnection DB = new SQLiteConnection ();
String question = DB.getQuestionUser();
DB.getUtilisateur(user);
cbx_question.addItem(question);
}
It keep on add item on the list of my model but do not show what is on the database column.
Hope that you will understand

The easiest way to populate a JComboBox is to supply the data when you call the constructor.
There are three different constructors you can call (supplying your data structure):
JComboBox(ComboBoxModel aModel)
Creates a JComboBox that takes its items from an existing ComboBoxModel.
JComboBox(E[] items)
Creates a JComboBox that contains the elements in the specified array.
JComboBox(Vector items)
Creates a JComboBox that contains the elements in the specified Vector.
You need to check what return type the database query has and convert it into one of the three previous data structures.
Later, if you wish to use the same JComboBox object to display other data (same type as before) you can do so by calling setModel( ComboBoxModel<E> model )
Source: Oracle documentation page

Display data from database using Javascript in Java code

I am using java and jsp to display my data.
I want to use javascript to display data from database on select of item from dropdown list.
i.e. i have a form where on selecting an item from a dropdown list the information of that item should be displayed.
How should I start it?

editable table in jsp whose rows(may be more than one row) on updation are updated in database

I need to develop an jsp application where I need to bring data from database table and display it in table in frontend dynamically. I need to make this table editable. The user can edit any number of rows which all should be updated in the database table automatically on clicking Save Changes button.
I am able to bring data from database table and display it. I am displaying the values obtained from table in each cell of input type text of form. We am i clicking edit button i am able to update only last edited row in the table.
Please tell how to update all the edited rows at a time.

Provide two links for view and edit
of table values
In view keep the values simply in td element of table.
In edit , use input elements of type text inside td element.
If you want to do everything in same page, Ajax can be used for both view and edit.

Inserting radio buttons in a DefaultTableModel

I have a 2D array of objects which needs to be displayed in a table through a table model class which extends a DefaultTableModel. In addition to the columns needed to accommodate the data included in this array, I would like to add an extra column with radiobuttons, in order to enable the user to make a selection. As table model accepts only arrays of objects or vectors, how should I add radio buttons?

By default, JTable infers how to render and edit entries based on the entry's class, as discussed in the tutorial article Editors and Renderers. In this example, a checkbox allows multiple selections in a column. Substituting a radio button and using a ButtonGroup would accommodate a unique selection.