Dynamic Forms in Spring

Question

I am trying to make a dynamic form using Spring forms. Basically, the form gets a title of learning activity and then there\'s the a button below it that says, \"Add one mor

Answer 1

You can't use <form:input> within the javascript because is a jsp tag that runs on the server-side.

However, there's nothing magical about how an HTML input gets bound to a field in the Spring command object; it's just based on the name. So in your javascript, add a new <input type="text" name="activity[1].activity"> (for example -- obviously you'll increment the index).

Another option I've used for more complicated controls is to grab the HTML of the existing control (which was created using the Spring form:input tag) and clone it, replacing the indexes with the incremented number. This gets a lot easier if you use jQuery.

EDITED TO ADD: One issue that may cause you problems: you're appending your new input box to the end of your outer div ("text"), which means it's not inside the form tags. That won't work.

Answer 2

Is <form:input> a JSP tag? If so, then client-side Javascript to add <form:input> nodes to the DOM will have no effect - since the server-side JSP engine is not interpreting those.

Your Javascript needs to work with raw HTML and DOM, such as adding an <input> element.