[TYPO3-english] simple autofill feature in edited page

[Dave Bui]

Hi Guys,

 

Just wondering if anyone can point me a direction to create an auto
completion feature in Typo3 edited page. 

 

For example, you open up  page in admin to edit and there are 2 fields:
'Year of birth' and 'Age'. 

What I want to do is that if you type a number "1983" in "year of Birth"
field, then the 'Age' field will be filled automatically a number "25". 

 

Thanks in advanced.

 

Dave