Golang : Pagination with go-paginator configuration example

Here is an example that you can use as reference on how to configure go-paginator properly. The snippets below are from my own project and it took me a while to get it right.

In the main.go:

 import "github.com/go-chi/chi"
 ...
 mx := chi.NewRouter()
 ...
 mx.HandleFunc("/listproperty", controllers.ListProperty) // to handle first page
 mx.HandleFunc("/listproperty/{pageNumber}", controllers.ListProperty) // and subsequent pages(pagination)

In the ListProperty.go controller:

  // ListProperty to populate home page
  func ListProperty(w http.ResponseWriter, r *http.Request) {
  ...
  currentPageNumber := chi.URLParam(r, "pageNumber")
  currentPageNumberInt, _ := strconv.Atoi(currentPageNumber) // convert to int

  allRows := conn.Model(properties) <--- replace with your own function that returns all the related rows from database

  propertiesPerPage := 3 <---- change this number to your own

  paginated := paginator.New(adapter.NewGORMAdapter(allRows), propertiesPerPage)
  paginated.SetPage(currentPageNumberInt)

  if err = paginate.Results(&properties); err != nil {
 panic(err)
  }

  templateDataMap["propertiesList"] = *properties
  paginateView := view.New(&paginate)
  templateDataMap["paginatePages"] = paginateView.Pages()
  templateDataMap["paginateNext"] = paginateView.Next()
  templateDataMap["paginatePrev"] = paginateView.Prev()
  templateDataMap["paginateLast"] = paginateView.Last()
  templateDataMap["paginateCurrent"] = paginateView.Current()

  templateDataMap["paginateHasNext"] = paginate.HasNext()
  templateDataMap["paginateHasPrev"] = paginate.HasPrev()
  templateDataMap["paginateHasPages"] = paginate.HasPages()
  ...

  // populate the view(template) with data
  var listPropertyPageBody = template.Must(template.New("listPropertyPageBody").Parse(body.ListPropertyHTML))
  if err := listPropertyPageBody.ExecuteTemplate(w, "listPropertyPageBody", templateDataMap); err != nil {
 log.Println(err)
  }

and finally in the HTML template:

 {{if .paginateHasPages}}
 <ul class="pagination">

 {{if .paginateHasPrev}}
 <li class="page-item"><a class="page-link" href="/listproperty">First</a></li>
 {{end}}

 {{if .paginateHasPrev}}
 <li class="page-item"><a class="page-link" href="/listproperty/{{.paginatePrev}}">Previous</a></li>
 {{end}}
 
 {{range .paginatePages}}
 
 {{if (ge $.paginateLast .)}}
 <li class="page-item {{if (eq $.paginateCurrent .)}}
 {{print "active"}}
 {{else}}
 {{print ""}}
 {{end}}">

 <a class="page-link" href="/listproperty/{{.}}">{{.}}</a>
 </li>
 {{end}}  
 {{end}}

 {{if .paginateHasNext}}
 <li class="page-item"><a class="page-link" href="/listproperty/{{.paginateNext}}">Next</a></li>
 {{end}}

 {{if (gt $.paginateLast $.paginateCurrent)}}
 <li class="page-item"><a class="page-link" href="/listproperty/{{.paginateLast}}">Last</a></li>
 {{end}}
 
 </ul>
 {{end}} 

Hope this helps!

References:

https://socketloop.com/tutorials/golang-how-to-use-if-eq-and-print-properly-in-html-template

https://github.com/vcraescu/go-paginator