16.8.2.5.4 Previewing Images in a Grid to Enter Titles

Preview staged uploads in a grid and collect required values before saving them.

After uploading the photos, the end user sees a preview of each one in a grid where they can add a required title before posting.

• Toggling UI Based on Collection Contents
  Toggle the page between image upload and title entry based on whether staged photos exist.
• Serving Inline Temp Images for Preview
  Serve staged upload images from APEX_APPLICATION_TEMP_FILES so they can appear in a preview grid.
• Entering Images Titles in a Grid
  Build an editable grid that previews staged images and lets users add titles or remove photos.
• Invalidating Required Queried-Null Titles
  Invalidate required grid cells with no value when queried so users must enter titles before posting photos.
• Saving the Posted Images with Titles
  Save posted images with their entered titles when the user clicks (Post Photos).