Challenges arising from AJAX, JavaScript, and ASP.Net MVC integration

Question

Challenges arising from AJAX, JavaScript, and ASP.Net MVC integration

Hello, everyone!

I am developing a website using Asp.Net MVC 2.
I have implemented a TimeController and TimeView along with a CountDownHelper to render time on the TimeView page.
Additionally, I have JavaScript that updates the current time which is used in the CountDownHelper.

I need to make an AJAX call from this JavaScript to fetch the current server time. Can someone guide me on how to achieve this? I need to get it done within the next few hours!

Below you can find the JavaScript code as well as my attempt to call AJAX. I have tried various ways to write GetServerTime.html but none of them seem to work. (((


//countDown.js  
function calcage(secs, num1, num2) 
{
    s = ((Math.floor(secs / num1)) % num2).toString();
    if (LeadingZero && s.length < 2)
        s = "0" + s;
    return "<b>" + s + "</b>";
}

function CountBack(secs) 
{
    if (secs < 0) 
    {
        location.reload(true);
        document.getElementById("cntdwn").innerHTML = FinishMessage;
        return;
    }

    //difference between received time and current client time
    diff = new Date(new Date() - clientTime);
    targetD = new Date(TargetDate);
    serverD = new Date(serverDate);
    currentServerDate = new Date(serverD.getTime() + diff.getTime());

    leftD = new Date(targetD.getTime() - currentServerDate.getTime());

    secs = leftD.getTime() / 1000;

    DisplayStr = DisplayFormat.replace(/%%D%%/g, calcage(secs, 86400, 100000));
    DisplayStr = DisplayStr.replace(/%%H%%/g, calcage(secs, 3600, 24));
    DisplayStr = DisplayStr.replace(/%%M%%/g, calcage(secs, 60, 60));
    DisplayStr = DisplayStr.replace(/%%S%%/g, calcage(secs, 1, 60));

    document.getElementById("cntdwn").innerHTML = DisplayStr;
    if (CountActive)
        setTimeout("CountBack(" + (secs + CountStepper) + ")", SetTimeOutPeriod);
}

function putspan(backcolor, forecolor) 
{
    document.write("<span id='cntdwn' style='background-color:" + backcolor +
                "; color:" + forecolor + "'></span>");
}

if (typeof (BackColor) == "undefined")
    BackColor = "white";
if (typeof (ForeColor) == "undefined")
    ForeColor = "black";
if (typeof (TargetDate) == "undefined")
    TargetDate = "12/31/2020 5:00 AM";
if (typeof (serverDate) == "undefined")
    serverDate = "12/31/2020 5:00 AM";
if (typeof (DisplayFormat) == "undefined")
    DisplayFormat = "%%D%% Days, %%H%% Hours, %%M%% Minutes, %%S%% Seconds.";
if (typeof (CountActive) == "undefined")
    CountActive = true;
if (typeof (FinishMessage) == "undefined")
    FinishMessage = "";
if (typeof (CountStepper) != "number")
    CountStepper = -1;
if (typeof (LeadingZero) == "undefined")
    LeadingZero = true;


CountStepper = Math.ceil(CountStepper);
if (CountStepper == 0)
    CountActive = false;
var SetTimeOutPeriod = (Math.abs(CountStepper) - 1) * 1000 + 990;
putspan(BackColor, ForeColor);
var dthen = new Date(TargetDate);
var dtServ = new Date(serverDate);
var dnow = new Date();
if (CountStepper > 0)
    ddiff = new Date(dnow - dthen);
else
    ddiff = new Date(dthen - dtServ);

gsecs = Math.floor(ddiff.valueOf() / 1000);
CountBack(gsecs);

alert("Start");
alert(serverDate);

//AJAX CALL ???? 
//How to call async JavaScript?
//Which must be GetServerTime.html

$.get('Views/GetServerTime.html', function(data) {
    serverDate = data;
    clientTime = new Date();    
});

alert(serverDate);

javascript asp.net-mvc ajax

Answer 1

Answer №1

Typically, direct access to views is not recommended, as the view is often stored in an .ASPX file.

Therefore,

$.get('Views/GetServerTime.html',...

Can be changed to

$.get('/GetServerTime/',...

This pertains to the Views/GetServerTime/Index.aspx view and the getserverTimeController.cs controller with a default Action of Index.

It seems there may be more issues at play here?

Edit

Additionally, it might be better to utilize JSON for this task. You can employ the System.Web.Mvc.JsonResult to automatically send your result as JSON, which jQuery can then process and convert into javascript objects.

        $.get('/GetServerTime/', 
                        function (data)
                        {
                                if (data.HasError == false)
                                {
                                    $("#resultDiv").html(data.ServerTime);
                                }
                        }, "json");

Your MVC Action could resemble the following...

public JsonResult Index(string id)
{
    JsonResult res = new JsonResult();          
    res.JsonRequestBehavior = JsonRequestBehavior.AllowGet;

    res.Data = new { ServerTime = DateTime.Now(), HasError = false };

    return res;
}

The code above is a rough example since I don't have a compiler available.

Answer 2

Typically, direct access to views is not recommended, as the view is often stored in an .ASPX file.

Therefore,

$.get('Views/GetServerTime.html',...

Can be changed to

$.get('/GetServerTime/',...

This pertains to the Views/GetServerTime/Index.aspx view and the getserverTimeController.cs controller with a default Action of Index.

It seems there may be more issues at play here?

Edit

Additionally, it might be better to utilize JSON for this task. You can employ the System.Web.Mvc.JsonResult to automatically send your result as JSON, which jQuery can then process and convert into javascript objects.

        $.get('/GetServerTime/', 
                        function (data)
                        {
                                if (data.HasError == false)
                                {
                                    $("#resultDiv").html(data.ServerTime);
                                }
                        }, "json");

Your MVC Action could resemble the following...

public JsonResult Index(string id)
{
    JsonResult res = new JsonResult();          
    res.JsonRequestBehavior = JsonRequestBehavior.AllowGet;

    res.Data = new { ServerTime = DateTime.Now(), HasError = false };

    return res;
}

The code above is a rough example since I don't have a compiler available.

Answer 3

Answer №2

First and foremost, I have reservations about using "GetServerTime.html" to obtain the current time. Are you certain that is the correct page name you want to use? It may require specific Routing configuration to handle that URL pattern, as mentioned by Kervin below.

Additionally, the "function(data)" method within an ajax call serves as the callback function that executes when the ajax request completes.

When creating a page to return server date/time information, it's important to determine the format in which it will be retrieved: XML or JSON. Subsequently, the controller should be set up accordingly.

public class DateController : Controller {
    public ActionResult CurrentDate()
    {
       var returnJson = new 
          {
              currentDate = DateTime.Now.ToString()
          }

       return Json(returnJson, JsonRequestBehavior.AllowGet);
    }
}

The .get function to retrieve this data would then appear as follows:

$.get('/Date' function(data) {
    theDate = data.currentDate;
});

Answer 4

First and foremost, I have reservations about using "GetServerTime.html" to obtain the current time. Are you certain that is the correct page name you want to use? It may require specific Routing configuration to handle that URL pattern, as mentioned by Kervin below.

Additionally, the "function(data)" method within an ajax call serves as the callback function that executes when the ajax request completes.

When creating a page to return server date/time information, it's important to determine the format in which it will be retrieved: XML or JSON. Subsequently, the controller should be set up accordingly.

public class DateController : Controller {
    public ActionResult CurrentDate()
    {
       var returnJson = new 
          {
              currentDate = DateTime.Now.ToString()
          }

       return Json(returnJson, JsonRequestBehavior.AllowGet);
    }
}

The .get function to retrieve this data would then appear as follows:

$.get('/Date' function(data) {
    theDate = data.currentDate;
});

Challenges arising from AJAX, JavaScript, and ASP.Net MVC integration

Answer №1

Answer №2

Similar questions

Exploring the possibilities of repetition in puppeteer

Tips for implementing a Jquery .keyup function on elements that are dynamically loaded via Ajax requests

What is the best way to loop through a group of WebElements, and only log the results that contain a specific substring?

Troubleshooting: Issues with Contenteditable div functionality in Angular 2

Implement a "please wait" JavaScript modal on the ASPX DetailView insert button

Highlighted keyword: Unusual mouse movements

Using AngularJS to extract values from deeply nested JSON structures

Selecting elements with jQuery allows you to manipulate the

Resize all types of content using a "zooming" container

After repeated attempts to initialize and destroy, Froala encounters issues when loading a textarea via Ajax

Troubleshooting Problem with Custom Class Buttons in Angular Material

Mastering the Integration of React in Node.js

Unable to identify modified identifier

What is the best way to extract the href value or URL from a JavaScript function and then utilize it for redirection

Achieve the buoyancy effect in threejs to make an object float on water

"Enhancing User Authentication with Firebase Email Verification in React Native

Two DataTables on a Single Page - Odd Initialization in the Second One

JavaScript-powered Chrome Extension designed for modifying CSS styling

Material-UI's style is taking precedence over other styles that have been defined

The attempt to call an Ajax POST was unsuccessful