Implement the submission of dynamic text boxes and their values ​​in JSP beans

Question

I have a form with a few predefined textboxes and now apart from that I have also created some dynamic textboxes and I can do it with javascript (I guess). How to set the value of a dynamically generated textbox to a bean when a form is submitted. In the bean, I defined a string array to hold the contents of the dynamically generated textbox value. I am not using any framework, please guide me how to do this?

Answer 1

You can give all input fields the same name and then use request.getParameterValues() to get all values ​​in the order they appear in the HTML DOM tree.

For example (JavaScript generation)

<input type="text" name="foo" />
<input type="text" name="foo" />
<input type="text" name="foo" />
...

and

String[] values = request.getParameterValues("foo");
// ...

You can also add incrementing numbers after the name, such as foo1, foo2, foo3, etc. and collect the values ​​in a loop until ## is received #null.

For example

<input type="text" name="foo1" />
<input type="text" name="foo2" />
<input type="text" name="foo3" />
...

and

List<String> foos = new ArrayList<String>();

for (int i = 1; i < Integer.MAX_VALUE; i++) {
    String foo = request.getParameter("foo" + i);
    if (foo == null) break;
    foos.add(foo);
}

// ...