[英]waiting for multiple asynchronous facebook requests
需要等待對Facebook的幾個請求完成,然后才能在頁面上執行最終操作(更新返回信息的請求數量),但不確定如何處理。
在啟動功能之前,如何檢查每個功能是否已完成並更新計數器。
window.load
為時過早,除非登錄后刷新頁面...?
window.fbAsyncInit = function () {
FB.init({
appId: 'id', // App ID
//channelUrl: '//facebookdev.smithbrosagency.com/LOL/xss_channel.htm', // Channel File
status: true, // check login status
cookie: true, // enable cookies to allow the server to access the session
xfbml: true // parse XFBML
});
getStatus();
//Subscribe to events
FB.Event.subscribe('auth.statusChange', function (response) { if (response.authResponse) { getStatus(); } });
FB.Event.subscribe('auth.login', function (response) { if (response.status === 'connected') { getStatus(); } });
};
function getStatus() {
FB.getLoginStatus(function (response) {
if (response.status === 'connected') {
setPanel('results'); // connected
var accessToken = response.authResponse.accessToken;
var obj = getPermissionsObject(function (permissions) {
getUserInfo(response);
getUserPhotos(response, accessToken);
getFriends(response, accessToken);
getUserLocations(response, accessToken);
getUserMusic(response, accessToken);
getUserMovies(response, accessToken);
});
} else {
setPanel('login'); // not logged in or unauthorized
}
});
}
function getUserPhotos(response, accessToken) {
FB.api('/me/photos?access_token=' + accessToken, function (response) {
var photoList = response.data;
var len = photoList.length;
if (len >= 3) {
var max = 3;
if (len > max) { len = max }; // cap it at 3
for (var i = 0; i < len; i++) {
(function () {
var j = i;
var idx = i + 1;
$('.result2 .option' + idx + ' input').val(photoList[i].picture);
$('.result2 .option' + idx + ' img').attr("src", photoList[i].picture);
})();
}
$('div.result2').addClass("active");
$('#q2 input').val(1); // add to hidden to count results
}
else {
// hide & subtract from total questions
$('div.result2').addClass("inactive");
$('#q2 input').val(0);
}
});
}
$(window).load(function () {
$.when($('#q2 input').val() != '' && $('#q4 input').val() != '' && $('#q5 input').val() != '').then(test());
function test() {
// calc total questions
var total = 0;
$("#Results div input[hidden]").each(function () {
total += $(this).val() * 1;
});
alert(total);
}
});
我不確定我是否正確理解您,但似乎您需要實現這樣的對象:
<script type="text/javascript">
//Monitoring object
function RequestStatusMonitor()
{
this.resetRequests();
}
//IDs of the requests you need to monitor
RequestStatusMonitor.prototype.requests=["firstRequest","secondRequest","thirdRequest"];
//Status of the requests
RequestStatusMonitor.prototype.requestsCompleted=[];
//Set all requests to incomplete state
RequestStatusMonitor.prototype.resetRequests = function()
{
this.requestsCompleted = [];
for(var it in this.requests)
{
this.requestsCompleted[this.requests[it]] = false;
}
}
//Set status for a request determined by requestName
RequestStatusMonitor.prototype.setRequestStatus = function(requestName, status)
{
this.requestsCompleted[requestName] = status;
}
//Check if all requests are completed
RequestStatusMonitor.prototype.allRequestsAreCompleted = function()
{
for(var it in this.requestsCompleted)
{
if(!this.requestsCompleted[it])
{
return false;
}
}
return true;
}
//----------------------------------------------------------------------------------
//Usage Example
var monitor = new RequestStatusMonitor();
function onFirstRequestFinished(/*necessary parameters*/)
{
monitor.setRequestStatus("firstRequest", true);
checkCompleted();
}
function onSecondRequestFinished(/*necessary parameters*/)
{
monitor.setRequestStatus("secondRequest", true);
checkCompleted();
}
function onThirdRequestFinished(/*necessary parameters*/)
{
monitor.setRequestStatus("thirdRequest", true);
checkCompleted();
}
function checkCompleted()
{
if(monitor.allRequestsAreCompleted())
{
//Do what you need after all requests are completed
alert("All requests are completed");
}
}
onFirstRequestFinished();
onThirdRequestFinished();
onSecondRequestFinished();
</script>
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