Requiered picture title

When users add pictures of properties in the front-end I would like to make the Picture title field required. How can I do this?

Thank you

Hi,
You can make the modification on JS function to make the picture title field is required in file:
components > com_osproperty > classes > listing.hml.php
php function editListing
JS function : submitftForm (line 3098)
Solution: before submitting form "form.submit();" you need to check if the new picture is uploaded (yes/no) and if the answer is Yes, you can check the description of picture is entered (yes/no). If answer is no. you can return "false" and show alert to force the agent to enter the title.
Good luck
Dam