Cloud Firestore JavaScript

gistfile1.txt

      // https://stackoverflow.com/a/2117523
      function uuidv4() {
        return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(
              /[018]/g,
              c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
        );
      }
    
      document.addEventListener('DOMContentLoaded', function() {
        // // 🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥
        // // The Firebase SDK is initialized and available here!
        // // 🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥🔥

        noteId = window.location.hash; // was h
        project = "computasbrann-example";
        // f = firebase
        firebase.initializeApp({
            authDomain:project+".firebaseapp.com",
            projectId:project
        });
        
        var dbClient=null;
        var uuid = uuidv4();
        
        firebase.firestore().enablePersistence().then(function(){
            dbClient = firebase.firestore();

            
            noteElement = document.getElementById("note");
            noteDocument = dbClient.collection("notes").doc(noteId);
            
            noteElement.oninput = function(){
                noteDocument.set({
                    owner: uuid,
                    text: this.innerHTML
                });
            };
            
            noteDocument.set({owner:0}, {merge: true});
            
            noteDocument.onSnapshot(function(documentSnapshot){
                noteData = documentSnapshot.data();
                if(noteData.owner !== uuid ) {
                    noteElement.innerHTML = noteData.text || '';
                }
            });
        });
      });