Deleting Google Glass Timeline Items Using the Go Quick Start Project

(Note: This has been merged into the main project!)

A Google Glass user interacts with Glassware using timeline items, also known as cards. Currently the Quick Start Projects do not include a method for manually deleting these items, but the Mirror API does provide a way to do this.

I am developing Glassware using the Go (AKA golang) version of the Quick Start Project.

In the index.html file, I added a button using this block of code:

To this block:

          {{ range $item.Attachments }}
            {{ if HasPrefix .ContentType "image" }}
            
            {{ else }}
            Download
            {{ end }}
          {{ end }}
        
      
      {{ end }}

Resulting in this comple block:

          {{ range $item.Attachments }}
            {{ if HasPrefix .ContentType "image" }}
            
            {{ else }}
            Download
            {{ end }}
          {{ end }}
        
        
           
              
              
              
           
        
      
      {{ end }}

Secondly, add this method to the main.go file:

// deleteTimelineItem deletes a timeline item.
func deleteTimelineItem(r *http.Request, svc *mirror.Service) string {
itemId := r.FormValue(“itemId”)
err := svc.Timeline.Delete(itemId).Do()
if err != nil {
return fmt.Sprintf(“An error occurred: %vn”, err)
}
return “A timeline item has been deleted.”
}

Lastly, add the last line to the block defining the operations variable in main.go, adding the deleteTimelineItem method:

// Map of operations to functions.
var operations = map[string]func(*http.Request, *mirror.Service) string{
“insertSubscription”: insertSubscription,
“deleteSubscription”: deleteSubscription,
“insertItem”: insertItem,
“insertItemWithAction”: insertItemWithAction,
“insertItemAllUsers”: insertItemAllUsers,
“insertContact”: insertContact,
“deleteContact”: deleteContact,
“deleteTimelineItem”: deleteTimelineItem,
}

Save the files and redeploy your project to AppEngine. Once your reload your application in the browser, a button will appear underneath each timeline item that will delete it!