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Dynamic entries in web form

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Hi my dear fellow!!!
I am making a plot in my mind for resolving a situation. Suppose, I have a web form with a field Department. I want to add Sub Departments(unknown number) of one Department and then further Sub Sub Departments(unknown number) of one Sub Department. How I will make a form and how I will add this data in attached database. I have one solution:
One Department field with a button to add any sub department if any. By clicking on button, a new row will be generated with another text field and new button. In this way, it will go on. Tree like structure.
But I have another solution, JSF Tree to add or delete entries on the run time. But the problem is that I am unable to find any example of JSF tree like structure populated from database and in which we can add or delete entries on run time and on the same time these entries may also be stored in database.
Can you please give me right direction so that I can choose the professional approach for resolving this situation.
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I wouldn't suggest going for JSF just to populate text fields. (of course, unless you are already in JSF).
If I understand the context correctly, your first solution, which is using Javascript to populate text fields is the best way to go.
Consider Paul's rocket mass heater.
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