爲什麼indexedDB不會在Chrome中顯示新條目

Question

Im使用indexDB API與HTML5表單。出於某種原因，當我添加一個新條目時，它會立即在Firefox中顯示，但在Chrome刷新頁面之前不會顯示。

JS：

var mainForm, fName, lName, uName, pass, email, dob, phone, bio, nl, terms, school, gender, save, reset, db; 

function startDB(){ 
    mainForm = document.getElementById('mainForm'); 
    fname = document.getElementById('fName'); 
    lName = document.getElementById('lName'); 
    users = document.getElementById('uName'); 
    pass = document.getElementById('password'); 
    email = document.getElementById('email'); 
    dob = document.getElementById('dob'); 
    phone = document.getElementById('phone'); 
    bio = document.getElementById('bio'); 
    nl = document.getElementById('newsletter'); 
    terms = document.getElementById('terms'); 
    school = document.getElementById('school'); 
    gender = document.getElementsByName('gender'); 
    save = document.getElementById('save'); 
    reset = document.getElementById('reset'); 
    databox = document.getElementById('databox'); 

    save.addEventListener('click',addObject); 

    //open DB 
    var request = indexedDB.open('macroPlay'); 
    //if fails 
    request.addEventListener('error', showerror); 
    //if succeeds 
    request.addEventListener('success', start); 
    //if !exist, create. 
    request.addEventListener('upgradeneeded', createdb); 
} 
function showerror(e){ 
    alert('Error: ' + e.code + ' - ' + e.message); 
} 
function start(e){ 
    db = e.target.result; 
    showUsers();// Show all values in the object store 
} 
function createdb(e){ 
    var datababase = e.target.result; 
    var myusers = datababase.createObjectStore('users', {keyPath: 'userName'}); 
} 
function addObject(){ 
    var fName = document.getElementById('fName').value; 
    var lName = document.getElementById('lName').value; 
    var userName = document.getElementById('uName').value; 
    var pass = document.getElementById('password').value; 
    var email = document.getElementById('email').value; 
    var dob = document.getElementById('dob').value; 
    var phone = document.getElementById('phone').value; 
    var bio = document.getElementById('bio').value; 
    var nl = document.getElementById('nl').value; 
    var terms = document.getElementById('terms').value; 
    var school = document.getElementById('school').value; 

    //May need to set a loop to find value of radio 
    var gender; 
    var radios = document.getElementsByName('gender'); 

    for (var i = 0, length = radios.length; i < length; i++) { 
     if (radios[i].checked) { 
      gender=radios[i].value; 
     } 
    } 

    //set up transaction 
    var mytransaction = db.transaction(['users'], "readwrite"); 

    //get object store 
    var myusers = mytransaction.objectStore('users'); 

    //Add item 
    var request = myusers.add(new getUser(userName,fName,lName,pass,email,dob,phone,bio,nl,terms,school,gender)); 

    // Show all results. 
    request.addEventListener('success', showUsers);  

    //Reset Form Fields 
    clearForm(); 

} 
function getUser(userName, fn, ln, pw, em, dob, tel, bio, nl,tm, scl, gender){ 
    this.userName = userName; 
    this.fn = fn; 
    this.ln = ln; 
    this.pw = pw; 
    this.em = em; 
    this.dob = dob; 
    this.tel = tel; 
    this.bio = bio; 
    this.nl = nl; 
    this.tm = tm; 
    this.scl = scl; 
    this.gender = gender; 
} 
function showUsers(){ 
    //reset box 
    databox.innerHTML = ''; 
    //set the transaction 
    var mytransaction = db.transaction(['users']); 
    //get object store 
    var myusers = mytransaction.objectStore('users'); 
    //open the cursor and set an order 
    var newcursor = myusers.openCursor(null,"prev"); 
    //show all users on successful load of DB 
    newcursor.addEventListener('success',showUserList); 
} 
function showUserList(e){ 
    //var result = e.target.result; 
    //databox.innerHTML = '<div>' + result.id + ' - ' + result.name + ' - ' + result.date + '</div>'; 
    var cursor = e.target.result; // Capture multiple return values as a cursor 

    // Modify the databox to show the results 
    if (cursor){ 
     databox.innerHTML += '<div>' + 
     cursor.value.userName + ' - ' + 
     cursor.value.fn+ ' - ' + 
     cursor.value.ln+ ' - '+ 
     cursor.value.pw+ ' - '+ 
     cursor.value.em+ ' - '+ 
     cursor.value.dob+ ' - '+ 
     cursor.value.tel+ ' - '+ 
     cursor.value.bio+ ' - '+ 
     cursor.value.nl+ ' - '+ 
     cursor.value.tm+ ' - '+ 
     cursor.value.scl+' - '+ 
     cursor.value.gender+ 
     ' <input type="button" onclick="removeobject(\'' + cursor.value.userName + '\')" value="remove"/></div>'; 
      // Add a remove button as inserted HTML 
     cursor.continue(); // Iterates over the cursor 
    } 
} 
function removeobject(keyword){ 
    // Confirm the deletion 
    if(confirm('Are you sure?')){ 
     // Set the transaction 
     var mytransaction = db.transaction(['users'], "readwrite"); 
     // Get the object store 
     var mystore = mytransaction.objectStore('users'); 
     // Delete the record with the chosen index 
     var request = mystore.delete(keyword); 
     // If success, show the updated results 
     request.addEventListener('success', showUsers); 
    } 
} 
//reset functions 
function clearForm(){ 
    //Reset form 
    fname = document.getElementById('fName').value=''; 
    lName = document.getElementById('lName').value=''; 
    uName = document.getElementById('uName').value=''; 
    pass = document.getElementById('password').value=''; 
    email = document.getElementById('email').value=''; 
    dob = document.getElementById('dob').value=''; 
    phone = document.getElementById('phone').value=''; 
    bio = document.getElementById('bio').value=''; 
    nl = document.getElementById('nl').value=''; 
    terms = document.getElementById('terms').value=''; 
    school = document.getElementById('school').value=''; 
    gender = document.getElementsByName('gender').value=''; 
    showUserList(); 
} 
function reset(){ 
    if(confirm("are you sure?")){ 
     var f = document.getElementById("mainForm"); 
     f.reset(); 
    } 
} 

Answer 1

你寫你的交易讀事務運行之前可能不會完成。 add是異步的，因此在您繼續之前不能保證完成，even if you listen to the success signal。爲了解決這個問題，你有兩個選擇：

選項1：

通過它傳遞從addObject到showUsers使用相同的事務。

選項2：

等待第一事務完全完成，這保證了數據在移動之前寫入。因此，改變

request.addEventListener('success', showUsers); 

喜歡的東西

mytransaction.addEventListener('complete', showUsers);