如何使用 jquery 或 javascript 在 api 函数调用之外 return 变量值

Question

module.exports = function (ctx, application) {
var API;
var usermandData = [];
var clientmandData = [];
var taskmandData = []

API = {

    GetMandatoryFieldsforUser: function () {
        return MandatoryFields.User;
    },

    GetMandatoryFieldsforClient: function () {
        return MandatoryFields.Client;
    },

    GetMandatoryFieldsforTask: function () {
        return MandatoryFields.Task;
    }

};

var UserFields = $.get("api/mapping/mandatoryfield?type=USER", function (d) {        
    this.mandatoryuserdata = JSON.parse(d.Data);
    this.mandatoryuserdata.forEach(function (data) {
        usermandData.push(data.DisplayName);  // returns  ["First Name", "Last Name", "Location", "Email"]
    });      
})

var ClientFields = $.get("api/mapping/mandatoryfield?type=CLIENT", function (d) {
    this.mandatoryClientdata = JSON.parse(d.Data);
    this.mandatoryClientdata.forEach(function (data) {
        clientmandData.push(data.DisplayName); // returns ["Client Type", "Last Name / Entity Name", "Originating Location", "Responsible Person"],
    });
})

var TaskFields = $.get("api/mapping/mandatoryfield?type=TASK", function (d) {
    this.mandatoryTaskdata = JSON.parse(d.Data);
    this.mandatoryTaskdata.forEach(function (data) {
        taskmandData.push(data.DisplayName);  //returns  ["Client Name", "Period End Date", "Task Type", "Responsible Person"]
    });
})


MandatoryFields = {
    User: usermandData,
    Client: clientmandData,
    Task: taskmandData
}

Reqres.setHandler('Dataexportwizard:getMandatoryfields', function (type) {
   // console.log(mandData)
    switch (type) {
        case "USER": return API.GetMandatoryFieldsforUser();
        case "CLIENT": return API.GetMandatoryFieldsforClient();
        case "TASK": return API.GetMandatoryFieldsforTask();
    }
});

我的问题是因为它是一个异步函数 MandatoryFields.User、MandatoryFields.Client 和 MandatoryFields.Task returns null 值，我需要推送 usermandData,clientmandData,taskmandData变成MandatoryFields.User , MandatoryFields.Client , MandatoryFields.Task 字段如何实现它使用jquery 或 javascript.

由于 MandatoryFields 对象在 jQuery get 方法之前执行，我只能在函数调用中使用值，但我需要在 MandatoryFields 对象中使用它我如何使用 jquery

实现它

Answer 1

处理这些类型的异步任务的最佳解决方案之一是使用 "Promises"（ES6 添加的 JS 功能）。试试这段代码可能会有帮助：-

module.exports = function (ctx, application) {
var API;
var usermandData = [];
var clientmandData = [];
var taskmandData = []

API = {
    GetStepContainerData: function () {
        return StepContainerData;
    },

    GetStepData: function () {
        return stepData;
    },

    GetMandatoryFieldsforUser: function () {
        return MandatoryFields.User;
    },

    GetMandatoryFieldsforClient: function () {
        return MandatoryFields.Client;
    },

    GetMandatoryFieldsforTask: function () {
        return MandatoryFields.Task;
    }

};

Promise.all([
    new Promise(function(resolve,reject){
        $.get("api/mapping/mandatoryfield?type=USER", function (d) {        
            this.mandatoryuserdata = JSON.parse(d.Data);
            this.mandatoryuserdata.forEach(function (data) {
                usermandData.push(data.DisplayName);  // returns  ["First Name", "Last Name", "Location", "Email"]
            });
            resolve();
        });
    }),

    new Promise(function(resolve,reject){
        $.get("api/mapping/mandatoryfield?type=CLIENT", function (d) {
            this.mandatoryClientdata = JSON.parse(d.Data);
            this.mandatoryClientdata.forEach(function (data) {
                clientmandData.push(data.DisplayName); // returns ["Client Type", "Last Name / Entity Name", "Originating Location", "Responsible Person"],
            });
            resolve();
        })
    }),

    new Promise(function(resolve,reject){
        $.get("api/mapping/mandatoryfield?type=TASK", function (d) {
            this.mandatoryTaskdata = JSON.parse(d.Data);
            this.mandatoryTaskdata.forEach(function (data) {
                taskmandData.push(data.DisplayName);  //returns  ["Client Name", "Period End Date", "Task Type", "Responsible Person"]
            });
            resolve();
        });
    })
    ]
).then(function(result){

    // After resolving all the promises this method will execute
    MandatoryFields = {
        User: usermandData,
        Client: clientmandData,
        Task: taskmandData
    }
});


Reqres.setHandler('Dataexportwizard:getMandatoryfields', function (type) {
   // console.log(mandData)
    switch (type) {
        case "USER": return API.GetMandatoryFieldsforUser();
        case "CLIENT": return API.GetMandatoryFieldsforClient();
        case "TASK": return API.GetMandatoryFieldsforTask();
    }
});

如何使用 jquery 或 javascript 在 api 函数调用之外 return 变量值

How to return variable value outside api function call using jquery or javascript

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