add dynamic field to a form

hi,
i want to create a form which has dynamic field, what I mean that this fields not constant in their number or names, depends on the user options
for example we ask the user if he wants to add field(parameter), if he said yes we will show an input type field to insert his parameter and then we asked the same question for second time ,if he said yes we will do the same thing and so on until he said no ,
how to represent this in the form, and THE BIGGEST PROBLEM HOW TO STORE THIS IN DATABASE?? THE DATABASE HAS TO HAVE DYNAMIC FIELD??
master_programmerAsked:
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cmalakarConnect With a Mentor Commented:
Assuming the field is a text box....
1) Define an empty <div> tag in the form with an id.
2) Also define a variable in the javascript which contains the html code for showing a input field.
3) Write a javascript function inside which, you can keep on adding the code defined in second step to the <div> tags inner html.

Whenever user presses yes, call the javascript function defined in third step. & add the input field html code to the <div> tags inner html.

For Database,

You can store the values of all the fields in a single row by using one delimiter. Restrict the user from entering the delimter character as a value of the field.

We you retrieve and show you can tokenize the value in the column and show that many fields in the form again to the same user.
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ysnkyCommented:
for database you need a table with these columns;
id, user_id, field_value

for each record you need to insert a row.
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