Can I prevent empty textbox values being posted in the URL?

[Guest_imported]

I have written a html questionnaire that includes radio buttons, checkboxes, drop-down menus, textfields and textareas. When I click submit on an incomplete questionnaire, questions that use radio buttons and checkboxes do not appear in the querystring, but questions that use textfields, textareas and drop-down menus do, even if they have no value
i.e.

http://localhost:7001/Questionnaire?textfield1=&textarea1=

Is there any way of preventing this?

Thanks

PS using the post method is not an option - i need to use the get method in my form

 

[baad]

hie
i'm afraid that textfield value wuld be passed always..
but u can prevent form from submitin if some fields werent filled in regards, vic