SMARTY,仅使用更改的字段提交FORM。 忽略所有字段都包含默认值

Two arrays are passed to tpl file, first gets all row elements, second one is used for avaliable options. Then i'm populating a form with those data.

Till now it's easy. So we have:

field1 | field2 | field3 
------------
1  | some_desc | select val1, val2,val3...<br>
1  | some_desc | select val1, val2,val3...<br>
1  | some_desc | select val1, val2,val3...<br>

the default value for all form is val1

when I change field3 from val1 to val2 or val3 and submit data, I would like to pass only those elements of form where change happends. Is it possible in SMARTY, without javascript?

I know I can submit all, and in PHP ignore those POSTed with default val1, but maybe SMARTY is so great, that there is solution for that.