如果第一次没有成功返回ajax请求,我想忽略第二个请求,直到第一个请求返回成功响应。
public static POST<T>(url: string, data): Promise<T> {
var p = new Promise((resolve, reject) => {
$.ajax({
url: url,
data: data,
type: "POST",
cache: false,
success: function (response: HttpResponse) {
//success
},
error: function (response) {
reject("error");
}
});
});
p.catch((err) => {
//error
});
return p;
}
我已经解决了这个问题。代码如下:
var flag: { Url: string, Data: any }[];
flag = [];
public static POST<T>(url: string, data): Promise<T> {
for (var i = 0; i < flag.length; i++) {
if (flag[i].Url == url && CompareObjectEqual(flag[i].Data, data)) {
return;
}
}
var postInfo = {
Url: url,
Data: data
};
flag.push(postInfo);
var p = new Promise((resolve, reject) => {
$.ajax({
url: url,
data: data,
type: "POST",
cache: false,
success: function (response: HttpResponse) {
flag = [];
//success
},
error: function (response) {
reject("error");
}
});
});
p.catch((err) => {
flag = [];
//error
});
return p;
}
CompareObjectEqual的功能:
function CompareObjectEqual(a, b) {
if (!(a instanceof Object && b instanceof Object)) {
return a === b;
}
var aProps = Object.getOwnPropertyNames(a);
var bProps = Object.getOwnPropertyNames(b);
if (aProps.length != bProps.length) {
return false;
}
for (var i = 0; i < aProps.length; i++) {
var propName = aProps[i];
if ((a[propName] instanceof Object) && (b[propName] instanceof Object)){
CompareObjectEqual(a[propName], b[propName]);
} else {
if (a[propName] !== b[propName]) {
return false;
}
}
}
return true;
}
答案 0 :(得分:0)
我不确定你是如何调用promise的,但是你总是可以使用一个标志或变量来表示请求已被发送,然后在返回响应时切换该标志/变量。另外,我假设您正在使用Typescript,所以我使用该语法编写了我的响应。
postSubmitted = false;
public static POST<T>(url: string, data): Promise<T> {
if (postSubmitted) { return };
postSubmitted = true;
var p = new Promise((resolve, reject) => {
$.ajax({
url: url,
data: data,
type: "POST",
cache: false,
success: function (response: HttpResponse) {
postSubmitted = false;
//success
},
error: function (response) {
postSubmitted = false;
reject("error");
}
});
});
p.catch((err) => {
//error
});
return p;
}