Updating Html Table when data is added to mongo db

Ketamine Kyle · 2023-12-29T00:12:33.859Z

I am making a asp.net core mvc application and I wanna add data to my table every time a entry is added to my mongodb? I have tried using SignalR but it wont work? any ideas on how I could do it

<

<>•12/29/23, 12:13 AM

yeah use java

A

Angius•12/29/23, 12:15 AM

Sure, SignalR will work for real-time communication

K

Ketamine KyleOP•12/29/23, 12:15 AM

Im trying to do that atm but I keep getting errors

K

Ketamine KyleOP•12/29/23, 12:15 AM

let me send over my code

N

Nox•12/29/23, 12:16 AM

!ban 574584522541367306 Here to troll,

K

Ketamine KyleOP•12/29/23, 12:17 AM

  public class TableHub : Microsoft.AspNetCore.SignalR.Hub
  {
      public async Task SendDataToClients(object newData)
      {
          await Clients.All.SendAsync("UpdateTable", newData);
      }
  }

  public class TableHub : Microsoft.AspNetCore.SignalR.Hub
  {
      public async Task SendDataToClients(object newData)
      {
          await Clients.All.SendAsync("UpdateTable", newData);
      }
  }

  public class TableHub : Microsoft.AspNetCore.SignalR.Hub
  {
      public async Task SendDataToClients(object newData)
      {
          await Clients.All.SendAsync("UpdateTable", newData);
      }
  }

  public class TableHub : Microsoft.AspNetCore.SignalR.Hub
  {
      public async Task SendDataToClients(object newData)
      {
          await Clients.All.SendAsync("UpdateTable", newData);
      }
  }

 var hubContext = this.HttpContext.RequestServices.GetRequiredService<IHubContext<Noble.Hub.TableHub>>();
 hubContext.Clients.All.SendAsync("UpdateTable", data);

 var hubContext = this.HttpContext.RequestServices.GetRequiredService<IHubContext<Noble.Hub.TableHub>>();
 hubContext.Clients.All.SendAsync("UpdateTable", data);

 var hubContext = this.HttpContext.RequestServices.GetRequiredService<IHubContext<Noble.Hub.TableHub>>();
 hubContext.Clients.All.SendAsync("UpdateTable", data);

 var hubContext = this.HttpContext.RequestServices.GetRequiredService<IHubContext<Noble.Hub.TableHub>>();
 hubContext.Clients.All.SendAsync("UpdateTable", data);

var connection = new signalR.HubConnectionBuilder().withUrl("/myHub").build();

connection.on("UpdateTable", function (newData) {
    updateTable(newData);
});

connection.start().catch(function (err) {
    return console.error(err.toString());
});

function updateTable(newData) {
    var newRow = '<tr>' +
        '<td>' + Username + '</td>' +
        '<td>' + ID + '</td>' +
        '<td>' + newData.Country + '</td>' +
        '<td>' + Company + '</td>' +
        '<td><button class="btn btn-primary">Download</button></td>' +
        '</tr>';

    $('#dataTableExample tbody').append(newRow);
}

var connection = new signalR.HubConnectionBuilder().withUrl("/myHub").build();

connection.on("UpdateTable", function (newData) {
    updateTable(newData);
});

connection.start().catch(function (err) {
    return console.error(err.toString());
});

function updateTable(newData) {
    var newRow = '<tr>' +
        '<td>' + Username + '</td>' +
        '<td>' + ID + '</td>' +
        '<td>' + newData.Country + '</td>' +
        '<td>' + Company + '</td>' +
        '<td><button class="btn btn-primary">Download</button></td>' +
        '</tr>';

    $('#dataTableExample tbody').append(newRow);
}

var connection = new signalR.HubConnectionBuilder().withUrl("/myHub").build();

connection.on("UpdateTable", function (newData) {
    updateTable(newData);
});

connection.start().catch(function (err) {
    return console.error(err.toString());
});

function updateTable(newData) {
    var newRow = '<tr>' +
        '<td>' + Username + '</td>' +
        '<td>' + ID + '</td>' +
        '<td>' + newData.Country + '</td>' +
        '<td>' + Company + '</td>' +
        '<td><button class="btn btn-primary">Download</button></td>' +
        '</tr>';

    $('#dataTableExample tbody').append(newRow);
}

var connection = new signalR.HubConnectionBuilder().withUrl("/myHub").build();

connection.on("UpdateTable", function (newData) {
    updateTable(newData);
});

connection.start().catch(function (err) {
    return console.error(err.toString());
});

function updateTable(newData) {
    var newRow = '<tr>' +
        '<td>' + Username + '</td>' +
        '<td>' + ID + '</td>' +
        '<td>' + newData.Country + '</td>' +
        '<td>' + Company + '</td>' +
        '<td><button class="btn btn-primary">Download</button></td>' +
        '</tr>';

    $('#dataTableExample tbody').append(newRow);
}

K

Ketamine KyleOP•12/29/23, 12:17 AM

Anything im doing wrong?

A

Angius•12/29/23, 12:17 AM

You mentioned errors. What would they be?

K

Ketamine KyleOP•12/29/23, 12:18 AM

let me re run it and send hold on

A

Angius•12/29/23, 12:18 AM

Also, why

object

object

object

object?

K

Ketamine KyleOP•12/29/23, 12:19 AM

What would be better?

K

Ketamine KyleOP•12/29/23, 12:19 AM

System.NullReferenceException: 'Object reference not set to an instance of an object.'

K

Ketamine KyleOP•12/29/23, 12:19 AM

on this line
var hubContext = this.HttpContext.RequestServices.GetRequiredService<IHubContext<Noble.Hub.TableHub>>();

A

Angius•12/29/23, 12:19 AM

The... actual type would be better

A

Angius•12/29/23, 12:20 AM

Whatever type represents your data

A

Angius•12/29/23, 12:20 AM

And the error tells you something here is

null

null

A

Angius•12/29/23, 12:20 AM

So ig try to figure out what that is, with the help of the debugger

A

Angius•12/29/23, 12:20 AM

Also, why

GetRequiredServices

GetRequiredServices

GetRequiredServices

GetRequiredServices instead of using the DI container and injecting it?

A

Angius•12/29/23, 12:21 AM

Also also,

async

async

async

async method calls have to be

await

await

ed

K

Ketamine KyleOP•12/29/23, 12:21 AM

The problem is its not null since im literally using the data object in other parts in the same function

A

Angius•12/29/23, 12:22 AM

Something is

null

null

A

Angius•12/29/23, 12:22 AM

Could be

HttpContext

HttpContext

HttpContext

HttpContext

A

Angius•12/29/23, 12:22 AM

Could be the result of

GetRequiredServices()

GetRequiredServices()

GetRequiredServices()

GetRequiredServices()

A

Angius•12/29/23, 12:22 AM

Could be

RequestServices

RequestServices

RequestServices

RequestServices

A

Angius•12/29/23, 12:22 AM

Something

K

Ketamine KyleOP•12/29/23, 12:22 AM

alright Ill take a look

AAngius Also, why `GetRequiredServices` instead of using the DI container and injecting ...

K

Ketamine KyleOP•12/29/23, 12:26 AM

Yeah this was the problem

K

Ketamine KyleOP•12/29/23, 12:26 AM

Thanks mate

Updating Html Table when data is added to mongo db

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