為什么我不能使用jQuery從卸載事件處理程序中觸發AJAX請求?
[英]Why can't I use jQuery to fire an AJAX request from an unload event handler?
I have the following code, intended to log the event when a user closes a chat window:
我有以下代碼，用於在用戶關閉聊天窗口時記錄事件:
$(window).unload( function() {
test();
});
function test()
{
alert("Hi");
$.ajax({
type: "POST",
url: baseUrl + 'Index/test',
data: "user_id=" + "Nisanth" + "& chat_id=" + 2,
success: function(msg){
alert(msg);
}
});
alert('Success');
}
Both the "Hi" and "Success" messages alert fine but the alert in the AJAX callback doesn't... The operation I intend to trigger via the AJAX request is also not happening (I'm developing a chat application, and intend to log an entry in the database when the user closes the window).
“Hi”和“Success”消息都提示良好，但是AJAX回調中的警告沒有……我打算通過AJAX請求觸發的操作也沒有發生(我正在開發一個聊天應用程序，並打算在用戶關閉窗口時在數據庫中記錄一個條目)。
2 个解决方案
#1
15
Because the ajax is asynchronous, the page is unloading before the response is properly sent, effectively terminating the connection. Try setting async:false;, although this will delay unloading the page until after the response is received, which isn't great for user experience if your server is running slow.
因為ajax是異步的，所以在響應被正確地發送之前，頁面會被卸載，從而有效地終止連接。嘗試設置async:false;盡管這會將卸載頁面延遲到收到響應之后，但如果服務器運行緩慢，這對用戶體驗不是很好。
$(window).unload( function () {
test();
});
function test()
{
alert("Hi");
$.ajax({
async: false,
type: "POST",
url: baseUrl + 'Index/test',
data: "user_id=" + "Nisanth" + "& chat_id=" + 2,
success: function(msg){
alert(msg);
}
});
alert('Success');
}
#2
-4
the problem is the format of your data. It is converted to a query string, it must be Key/Value pairs something like: "user_id:value"
問題在於數據的格式。它被轉換為一個查詢字符串，它必須是鍵/值對，比如:“user_id: Value”
注意！
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