我有一个以下java脚本对象
function eventTypeObj() {
allEventTypes = [];
// When the object is created go and get all the event types that can be included in journey or clusters.
$.ajax({
url: "/ATOMWebService.svc/GetDisplayEventTypes",
dataType: "json",
success: function(result) {
allEventTypes = eval("(" + result.d + ")");
}
});
// Returns a list of all the event type IDS.
this.getEventTypeIds = function() {
var eventTypeIDs = [];
for (var i = 0; i < allEventTypes.length; i++) {
eventTypeIDs.push(allEventTypes[i].Id);
}
return eventTypeIDs;
};
}
我想知道是否有办法阻止有人调用 eventTypeObj.getEventTypeIds();在构造函数中的ajax调用成功之前,并且allEventTypes数组中没有数据?
最佳答案
这样的东西会更好(我不能保证这是 100% 有效,但这个概念是合理的):
function eventTypeObj() {
this.allEventTypes = [];
this.hasLoadedEventTypes = false;
var loadEventTypes = function(cb) {
$.ajax({
url: "/ATOMWebService.svc/GetDisplayEventTypes",
dataType: "json",
success: function(result) {
this.allEventTypes = eval("(" + result.d + ")");
this.hasLoadedEventTypes = true;
cb();
}
});
};
this.getEventTypeIds = function(updateEventTypes, callback) {
var _getEventTypeIds = function() {
var eventTypeIDs = [];
for (var i = 0; i < this.allEventTypes.length; i++) {
eventTypeIDs.push(this.allEventTypes[i].Id);
}
return eventTypeIDs;
};
if (!this.hasLoadedEventTypes || updateEventTypes) {
loadEventTypes(function(){ callback(_getEventTypeIds()); });
}
else callback(_getEventTypeIds());
};
}
用法示例:
var eto = new eventTypeObj();
eto.getEventTypeIds(false, function(eventTypeIdArray) {
// do stuff with the id array
});
/*
somewhere later on you want to get an updated eventTypeId array
in case the event types have changed.
*/
eto.getEventTypeIds(true, function(eventTypeIdArray) {
// do stuff with the updated ids
});
关于javascript - 如何在 ajax 完成之前停止对象方法调用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6771295/