Skip to main content

jQuery Ajax error handling, show custom exception messages

Hello Guys, I am going to share the global error handling in the jQuery Ajax and trying to cover all the errors displays. The detail you can see in the example, 
//jQuery global error handling Ajax.

//#region NAMESPACE
var demo = demo || {};
//#endregion

//#region VARIABLES USED IN THIS JS
var obj_hdrs = [];
var obj = new Object();

//#endregion

//#region GLOBAL CONTEXT

demo.baseConst = {
    baseUrl: getBaseURL(),
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    statusErrors : {
        'M400': "Server understood the request, but request content was invalid. [400]",
        'M401': "Unauthorized access. [401]",
        'M403': "Forbidden resource can not be accessed. [403]",
        'M404': "Requested page not found. [404]",
        'M500': "Internal server error. [500]",
        'M503': "Service unavailable. [503]",
        'M0': 'Not connect.\n Verify Network.',
        'MParsererror': 'Requested JSON parse failed. [Failed]',
        'MTimeout': 'Time out error. [Timeout]',
        'MAbort': 'Ajax request aborted. [Aborted]',
        'MUncaught': 'Uncaught Error.\n'
    }
}

//This method id used to get the base URL for global constant.

function getBaseURL() {
    var currentBaseURL = location.protocol + "//" + location.hostname +
        (location.port && ":" + location.port) + "/";
    return currentBaseURL;
};

//#endregion

//#region AJAX FUNCTIONS AND USER SESSION RELATED CODE

demo.ajax = (function () {

    //#region SET AJAX REQUEST HEADER

    var setHeaderRequest = function (xhr, arr_hdrs) {
        obj_hdrs = [];
        obj = new Object();

        // Common headers
        obj["RequestVerificationToken"] = tokenHeaderValue;

        obj_hdrs.push(obj);

        // Specific headers
        if (arr_hdrs !== undefined && arr_hdrs !== null && arr_hdrs !== '') {
            $.merge(obj_hdrs, arr_hdrs);
        }

        $.each(obj_hdrs, function (k, v) {
            $.each(obj_hdrs[k], function (i, val) {
                xhr.setRequestHeader(i, val);
            });
        });
    };

    //#endregion

    //#region AJAX ASYNC REQUEST

    var asyncCall = function (url, data, GETPOST, callback, arr_hdrs) {
        var global = demo.baseConst;

        $.ajax({
            url: global.baseUrl + url,
            type: GETPOST,
            contentType: global.contentType,
            data: data,
            beforeSend: function (xhr) {
                setHeaderRequest(xhr, arr_hdrs);
            },
            async: true,
            cache: false,
            success: function (data) {
                if (data !== undefined && data !== null && data !== "") {
                    if (data.Code !== undefined && data.Code !== null && data.Code !== "") {
                        if (data.Code.toLowerCase() === "ok") {
                            callback(data);                        
                        }
                        else if (data.Code.toLowerCase() === "error") {
                            demo.dialog.alertDialog('error', 'Error', 'Error', data.Message, null);
                        }
                        else {
                            demo.dialog.alertDialog('error', 'Error', 'Error', demo.constant.request.unableToProcessYourRequest, null);
                        }
                    }                   
                    else {
                        callback(data);
                    }
                }
                else if (data === null) {
                    callback(data);
                }
                else {
                    demo.dialog.alertDialog('error', 'Error', 'Error', demo.constant.request.unableToProcessYourRequest, null);
                }
            },
            error: function (jqXHR, textStatus, errorThrown) {
                jqXHRError(jqXHR, errorThrown);
            }
        })
        .fail(function (jqXHR, textStatus, errorThrown) {
            jqXHRError(jqXHR, errorThrown);
        });
    };

    //#endregion   

    ////#region AJAX ERROR HANDLING.
    var jqXHRError = function (jqXHR, exception) {
        var msg = '';
        var statusErrorMsg = demo.baseConst.statusErrors;

        if (jqXHR !== undefined && jqXHR !== null) {
            if (jqXHR.status === 0) {
                msg = statusErrorMsg.M0;
            }
            else if (jqXHR.status == 400) {
                msg = statusErrorMsg.M400;
            }
            else if (jqXHR.status == 401) {
                msg = statusErrorMsg.M401;
            }
            else if (jqXHR.status == 403) {
                msg = statusErrorMsg.M403;
            }
            else if (jqXHR.status == 404) {
                msg = statusErrorMsg.M404;
            }
            else if (jqXHR.status == 500) {
                msg = statusErrorMsg.M500;
            }
            else if (jqXHR.status == 503) {
                msg = statusErrorMsg.M503;
            }
            else if (exception === 'parsererror') {
                msg = statusErrorMsg.MParsererror;
            }
            else if (exception === 'timeout') {
                msg = statusErrorMsg.MTimeout;
            }
            else if (exception === 'abort') {
                msg = statusErrorMsg.MAbort;
            }
            else {
                msg = statusErrorMsg.MUncaught + jqXHR.responseText;
            }
            demo.dialog.alertDialog('error', 'Error', 'Error', msg, null);
        }
        else {
            demo.dialog.alertDialog('error', 'Error', 'Error', statusErrorMsg.MUncaught, null);
        }
    }
    ////#endregion

    return {
        asyncCall: asyncCall
    };
})();

//#endregion
By Anil Singh | Rating of this article (*****)

Popular posts from this blog

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file    Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVA...

nullinjectorerror no provider for httpclient angular 17

In Angular 17 where the standalone true option is set by default, the app.config.ts file is generated in src/app/ and provideHttpClient(). We can be added to the list of providers in app.config.ts Step 1:   To provide HttpClient in a standalone app we could do this in the app.config.ts file, app.config.ts: import { ApplicationConfig } from '@angular/core'; import { provideRouter } from '@angular/router'; import { routes } from './app.routes'; import { provideClientHydration } from '@angular/platform-browser'; //This (provideHttpClient) will help us to resolve the issue  import {provideHttpClient} from '@angular/common/http'; export const appConfig: ApplicationConfig = {   providers: [ provideRouter(routes),  provideClientHydration(), provideHttpClient ()      ] }; The appConfig const is used in the main.ts file, see the code, main.ts : import { bootstrapApplication } from '@angular/platform-browser'; import { appConfig } from ...

51 Best React Interview Questions and Answers

1) What Is React? React is a fast, open-source, and front-end JavaScript library and It was developed by Facebook in 2011 for building complex, stateful and interactive UI in web as well as mobile Applications. React follows the component based approach which helps you to building reusable and interactive web and mobile user interface (UI) components. React has one of the largest communities supporting it. The high level component Lifecycle - At the highest level component Lifecycle, React components have lifecycle events that are - 1.       Initialization 2.       State/Property Updates 3.       Destruction Explore to detail understanding   -  React Lifecycle Components Reactjs is very fast technology that can be trusted for complex tasks and can simply be trusted for quality outcomes. 2) When Reactjs released? March 2013 3) What Is the current stable version of ...

Top 15+ Angular 17 Interview Questions Answers | For Experienced Professionals as well

G Google team released the latest version of Angular – Angular 17 on November 6, 2023, creating a significant milestone for the super fast front-end development. What Are the New Features in Angular 17? 1.       Angular 17 is the highly anticipated release for the community, bringing many new exciting features, updates, and improvements. 2.       New Syntax for Control Flow in Templates - new @if, @switch, @for, @case, @empty @end control flow syntax 3.       Deferred Loading - @defer partial template 4.       The Angular signals API 5.       Angular SSR and client hydration 6.       Automatic Migration to Build-in Control Flow 7.       Build Performance with ESBuild 8.       By default, set this newly generated component as a standalone, and now we don't have an app module file. To use (ng...

Add /Change Meta Tags Dynamically Using JavaScript

Is it possible to use JavaScript to change the meta-tags of the page? Yes, it is definitely possible to use JavaScript to change the Meta tags of the page. Change Meta tag content dynamically through JavaScript : Let’s see the Example, <! DOCTYPE html > < html > < head >     < meta charset = "utf-8" >     < meta http-equiv = "X-UA-Compatible" content = "IE=edge" >     < meta name = "viewport" id = "viewport" content = "width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" >     < title > dynamically add meta tag JavaScript </ title > </ head > < body >     < script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js" async = "async" ></ script >     < script >         $ ( function (){   ...