如何确保在导航到另一个页面之前完全执行函数
How to ensure that a function is executed completely, before navigating to another page?
我正在使用网络服务删除某些记录。jquery ajax 请求是在超链接的点击中写入的。当我使用Firebug逐行执行脚本时,它被删除,否则不会。以前有没有人遇到过这样的情况?请帮忙
代码示例:
$(".target").click(function() {
func(); //This function should be executed completely before navigating to another page
});
var func = function() {
var items = $("#flag").find('td input.itemClass');
id = items[0].value;
var status = items[1].value;
var type = items[2].value;
var params = '{' +
'ID:"' + id + '" ,Type:"' + type + '" ,Status:"' + status + '"}';
$.ajax({
type: "POST",
url: "WebMethodService.asmx/DeleteItem",
data: params,
//contentType: "plain/text",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(msg) {
$("#deleteNotificationMessage").val("Item has been removed"); // keep a separate label to display this message
}
//Event that'll be fired on Success
});
}
jQuery ajax 函数返回延迟对象,因此我们return $.ajax
.然后你应该使用延迟。done
在 AJAX 完全完成后执行回调。当 AJAX done
时,请改用 JS 导航离开:
var func = function() {
...
return $.ajax({...}); //return our ajax deferred
}
$(".target").click(function() {
var target = this; //preserve "this" since this in the callback may be different
func().done(function(){ //our done callback executed when ajax is done
window.location.href = target.href; //assuming .target is a link
});
return false; //prevent the natural click action
});
您可以使用等待
完成调用的 ajax 调用上的async: false
。
var func = function() {
var items = $("#flag").find('td input.itemClass');
id = items[0].value;
var status = items[1].value;
var type = items[2].value;
var params = '{' +
'ID:"' + id + '" ,Type:"' + type + '" ,Status:"' + status + '"}';
$.ajax({
type: "POST",
async: false,
url: "WebMethodService.asmx/DeleteItem",
data: params,
//contentType: "plain/text",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(msg) {
$("#deleteNotificationMessage").val("Item has been removed"); // keep a separate label to display this message
}
//Event that'll be fired on Success
});
}
或者,您可以在请求后提交。
$(".target").click(function() {
func(); //This function should be executed completely before navigating to another page
return false;
});
var func = function() {
var items = $("#flag").find('td input.itemClass');
id = items[0].value;
var status = items[1].value;
var type = items[2].value;
var params = '{' +
'ID:"' + id + '" ,Type:"' + type + '" ,Status:"' + status + '"}';
$.ajax({
type: "POST",
async: true,
url: "WebMethodService.asmx/DeleteItem",
data: params,
//contentType: "plain/text",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(msg) {
$("#deleteNotificationMessage").val("Item has been removed"); // keep a separate label to display this message
$("#YourFormID").submit();
}
//Event that'll be fired on Success
});
}
只需将事件移动到 ajax 请求中的"成功"处理程序:
$.ajax({
type: "POST",
url: "WebMethodService.asmx/DeleteItem",
data: params,
//contentType: "plain/text",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(msg) {
$("#deleteNotificationMessage").val("Item has been removed");
//Event that'll be fired on Success
}
});
或者使用 jQuery ajax 回调方法。
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