问题
I am using iText 2.1.7. I have three radiobuttons in a table cell.
Initial all buttons (b1, b2 and b3) are unchecked.
Desired behaviour:
If Check b1: b2 & b3 to uncheck
If Check b2: b1 to uncheck
If Check b3: b1 to uncheck
So b2 and b3 can be checked at the same time.
Additionally i want that all buttons can be toggled to off again.
How can i achieve that behaviour? Help appreciated!
回答1:
Before I fully answer your question have a look a the example behavior - is that what you want? Do you have an PDF with existing fields or do you want to newly add those fields?
The solution does not use javascript.
1. Create a checkbox with 3 kids
1 0 obj
<</DA(/ZaDb 0 Tf 0 g)/FT/Btn/Kids[14 0 R 19 0 R 24 0 R]/T(checkbox1)>>
endobj
2. Create the 3 kids with values 1xb1 and 2xb2
14 0 obj
<</AP<</b1 18 0 R>>/N<</Off 15 0 R/b1 16 0 R>>>>/AS/Off/F 4/MK<</CA(8)>>/P 12 0 R/Parent 1 0 R/Rect[122 723 140 740]/Subtype/Widget/Type/Annot>>
endobj
19 0 obj
<</AP<</b2 23 0 R>>/N<</Off 20 0 R/b2 21 0 R>>>>/AS/Off/F 4/MK<</CA(8)>>/P 12 0 R/Parent 1 0 R/Rect[145 722 162 739]/Subtype/Widget/Type/Annot>>
endobj
24 0 obj
<</AP<</b2 28 0 R>>/N<</Off 25 0 R/b2 26 0 R>>>>/AS/Off/F 4/MK<</CA(8)>>/P 12 0 R/Parent 1 0 R/Rect[167 721 185 738]/Subtype/Widget/Type/Annot>>
endobj
Update: You can find the solution how to completely add new checkoxes to a PDF here.
来源：https://stackoverflow.com/questions/47351203/java-itext-and-custom-radiobutton-behaviour