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Adding a field content to a dropdown list in the same Form

GMiranda 10 Apr, 2010
Hello,

In a Form I have a dropdown list with the existent themes in the table (the list is created whit SELECT DISTINCT).
I would like to give the oportunity for the user to add a new theme in the same Form if it doesn't already exists.

My idea is to have two fields: theme_1 and theme_2. The first is the dropdown list, and the second a normal imput field.

Then, after Submit, the field theme_1 would be filled with the theme_2 value. The next time the dropdown list would include than new thame.

I don'n know how to do this operation of fill the field theme_1 with the value in theme_2

Any ideas?
Thank you in advance,
Gonzalo
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