jquery函数返回不起作用

jquery function return doesn't work

本问题已经有最佳答案，请猛点这里访问。

Possible Duplicate:
jQuery: Return data after ajax call success

我有从下一个函数调用的以下函数。它需要返回一些东西才能看出函数是否有效。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35

//Function to close any existing connection
function closeConnection(manual) {
//Establish connection to php script
$.ajax({
type: 'POST',
url: 'action/chat/closeconnection.php',
success: function (feedback) {
//If this function was called manually, also empty chatTextDiv and fade out chatDiv
if (manual == true) {
//Stop getting messages
clearInterval(setintervalid);
//Fade out chatDiv
$('#chatDiv').fadeOut(100);
//Empty chatTextDiv
$('#chatTextDiv').html('');
//Fade in openChatDiv
$('#openChatDiv').fadeIn(100);
}
}
}).error(function () {
//Append with connection error - user doesn't know that he is disconnected first so it is better to say this as the function will return false and stop other functions
if (manual != true) {
$('#chatTextDiv').append('You could not be connected. Please try again later.<hr/>');
//Stop getting messages
clearInterval(setintervalid);
var closeconnectionsuccess = false;
}
elseif(manual == true) {
$('#chatTextDiv').append('You could not be disconnected. Please try again later.<hr/>');
var closeconnectionsuccess = true;
}
});

return closeconnectionsuccess;
}

它实际上只是关于我想要返回函数成功的最后一行：代码不起作用。为什么不？

相关讨论

正如@Rockitsauce所说，你的closeconnectionsuccess变量不在函数范围内，因此在那时无法访问。但更重要的是，您必须考虑到您正在使用jQuery的异步函数 - 函数closeConnection将在调用回调(success，error)之前完成执行。如果要在HTTP请求完成后检索任何结果，您还必须向自己的函数添加回调函数，从而使其也异步。

因此，此代码应该有效：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40

//Function to close any existing connection
function closeConnection(manual, callback) {
//Establish connection to php script
$.ajax({
type: 'POST',
url: 'action/chat/closeconnection.php',
success: function(feedback) {
//If this function was called manually, also empty chatTextDiv and fade out chatDiv
if(manual==true)
{
//Stop getting messages
clearInterval(setintervalid);
//Fade out chatDiv
$('#chatDiv').fadeOut(100);
//Empty chatTextDiv
$('#chatTextDiv').html('');
//Fade in openChatDiv
$('#openChatDiv').fadeIn(100);
}
}
}).error(function() {
//Append with connection error - user doesn't know that he is disconnected first so it is better to say this as the function will return false and stop other functions
if(manual!=true)
{
$('#chatTextDiv').append('You could not be connected. Please try again later.<hr/>');
//Stop getting messages
clearInterval(setintervalid);
callback(false);
}
elseif(manual==true)
{
$('#chatTextDiv').append('You could not be disconnected. Please try again later.<hr/>');
callback(true);
}
});
}

closeConnection(manual, function(success) {
//Process result
});