Can ask student browser where they are in the page

direct.go

@@ -35,7 +35,7 @@ func declareAPIAdminDirectRoutes(router *gin.RouterGroup) {
 }
 
 func WSSurveyStats(sid int64) map[string]interface{} {
-	var users []string
+	var users []map[string]interface{}
 	var nb int
 
 	WSClientsMutex.RLock()
@@ -43,7 +43,10 @@ func WSSurveyStats(sid int64) map[string]interface{} {
 	if w, ok := WSClients[sid]; ok {
 		nb = len(w)
 		for _, ws := range w {
-			users = append(users, ws.u.Login)
+			users = append(users, map[string]interface{}{
+				"id":    ws.u.Id,
+				"login": ws.u.Login,
+			})
 		}
 	}
 
@@ -139,6 +142,26 @@ func SurveyWS(c *gin.Context) {
 	ch <- msgCurrentState(survey)
 
 	go SurveyWS_run(ws, ch, survey.Id, u)
+	go func(c chan WSMessage, sid int) {
+		var v WSMessage
+		var err error
+		for {
+			err = wsjson.Read(context.Background(), ws, &v)
+			if err != nil {
+				log.Println("Error when receiving message:", err)
+				close(c)
+				break
+			}
+
+			if v.Action == "myscroll" {
+				v.UserId = &u.Id
+				v.SurveyId = &survey.Id
+				WSAdminWriteAll(v)
+			} else {
+				log.Println("Unknown ws response:", v.Action)
+			}
+		}
+	}(ch, int(survey.Id))
 }
 
 func WSWriteAll(message WSMessage) {
@@ -423,6 +446,8 @@ func SurveyWSAdmin(c *gin.Context) {
 						}
 					}
 				}
+			} else if v.Action == "where_are_you" {
+				survey.WSWriteAll(v)
 			} else {
 				log.Println("Unknown admin action:", v.Action)
 			}

ui/src/routes/surveys/[sid]/admin.svelte

@@ -89,6 +89,16 @@
  }
  updateUsers();
 
+ let scroll_states = { };
+ let scroll_mean = 0;
+ $: {
+     let mean = 0;
+     for (const k in scroll_states) {
+         mean += scroll_states[k];
+     }
+     scroll_mean = mean / Object.keys(scroll_states).length;
+ }
+
  let responsesbyid = { };
  $: {
      const tmp = { };
@@ -200,6 +210,13 @@
          } else if (data.action && data.action == "new_ask") {
              asks.push({"id": data.question, "content": data.value, "userid": data.user});
              asks = asks;
+         } else if (data.action && data.action == "myscroll" && wsstats && wsstats.users) {
+             scroll_states[data.user] = parseFloat(data.value);
+             for (const k in wsstats.users) {
+                 if (wsstats.users[k].id == data.user) {
+                     wsstats.users[k].myscroll = scroll_states[data.user];
+                 }
+             }
          } else if (data.action && data.action == "end") {
              ws.close();
              updateSurvey();
@@ -646,23 +663,50 @@
             <i class="bi bi-arrow-clockwise"></i>
             <i class="bi bi-people"></i>
         </button>
-        <h3>
+        <button
+            type="button"
+            class="btn btn-sm btn-warning ms-1 float-end"
+            on:click={() => { scroll_states = {}; ws.send('{"action":"where_are_you"}')} }
+            title="Rapporter l'avancement"
+        >
+            <i class="bi bi-geo-fill"></i>
+        </button>
+        <h3 id="users">
             Connectés
             {#if wsstats}
                 <small class="text-muted">{wsstats.nb_clients} utilisateurs</small>
             {/if}
+            {#if scroll_mean}
+                <small
+                    class:text-danger={scroll_mean >= 0 && scroll_mean < 0.2}
+                    class:text-warning={scroll_mean >= 0.2 && scroll_mean < 0.6}
+                    class:text-info={scroll_mean >= 0.6 && scroll_mean < 0.9}
+                    class:text-success={scroll_mean >= 0.9}
+                >Avancement global&nbsp;: {Math.trunc(scroll_mean*10000)/100} %</small>
+            {/if}
         </h3>
         {#if wsstats && wsstats.users}
             <div class="row row-cols-5 py-3">
-                {#each wsstats.users as login, lid (lid)}
+                {#each wsstats.users as user, lid (lid)}
                     <div class="col">
                         <div class="card">
-                            <img alt="{login}" src="//photos.cri.epita.fr/thumb/{login}" class="card-img-top">
+                            <img alt="{user.login}" src="//photos.cri.epita.fr/thumb/{user.login}" class="card-img-top">
                             <div class="card-footer text-center text-truncate p-0">
-                                <a href="users/{login}" target="_blank">
-                                    {login}
+                                <a href="users/{user.login}" target="_blank">
+                                    {user.login}
                                 </a>
                             </div>
+                            {#if user.myscroll != null}
+                                <div
+                                    class="card-footer py-0 px-1"
+                                    class:bg-danger={user.myscroll >= 0 && user.myscroll < 0.2}
+                                    class:bg-warning={user.myscroll >= 0.2 && user.myscroll < 0.6}
+                                    class:bg-info={user.myscroll >= 0.6 && user.myscroll < 0.9}
+                                    class:bg-success={user.myscroll >= 0.9}
+                                >
+                                    Avancement&nbsp;: {Math.trunc(user.myscroll*10000)/100}&nbsp;%
+                                </div>
+                            {/if}
                         </div>
                     </div>
                 {/each}

ui/src/routes/surveys/[sid]/live.svelte

@@ -118,6 +118,9 @@
              } else {
                  timer_init = null;
              }
+
+         } else if (data.action && data.action == "where_are_you") {
+             ws.send('{"action":"myscroll", "value": "' + (window.scrollY/window.scrollMaxY) +'", "question": '+show_question+', "corrected": '+(survey.corrected==true)+'}')
          } else {
              show_question = null;
              if (timer_cancel) {