Schedule a CallBack , I think .

[beam]

Please brace yourselves as im pretty new to C# & .NET & Java Script. Im not sure this is under the exactly right topic.

I want to periodically check a mysql database for changes. I want to do it asynchronously. Im using C# & Java Script on IIS.

The interface is in html & javascript.

How can I get the client to every 30 seconds send a call back to the server to update the needed details. I am not sure if this is more on the javascript side or on the back end.

I realize that im gonna have to implement The "interrupt" In java script. Another thing is that i dont want it to interfere with the operations that the user might be doing.

[b1randon]

Please brace yourselves as im pretty new to C# & .NET & Java Script. Im not sure this is under the exactly right topic.

I want to periodically check a mysql database for changes. I want to do it asynchronously. Im using C# & Java Script on IIS.

The interface is in html & javascript.

How can I get the client to every 30 seconds send a call back to the server to update the needed details. I am not sure if this is more on the javascript side or on the back end.

I realize that im gonna have to implement The "interrupt" In java script. Another thing is that i dont want it to interfere with the operations that the user might be doing.

You'll need to use AJAX to do this. Ajax includes using an XMLRequest from your javascript as well as sending a response in XML format from the server. Your JS will then parse the response. My guess is that you'll want to do this in conjunction with Window.setInterval() so that it happens every 30 seconds. Google yourself a few tutorials (I don't use C# so I don't have any for you) and get something crude going. I'll be happy to help debug.

[AricC]

You can also refresh your pages with this meta tag:

<meta http-equiv="refresh" content="2;url=http://google.com">

[beam]

Thanks . I used a <iframe> that i made invisible .

  <iframe visible="false" runat="server" id="Reloadstuff"> </iframe>

and some java script for the call back .

 
function reLoad() 
{ 
  frm=document.getElementById("Reloadstuff")
  setTimeout("reLoad()",100000)// call reLoad every 20 seconds. 
  Reload()
 }
 

which is called with an on page load event.




So the page refreshes now. BUT i have another added problem ... Im already using async callbacks.

But on the c# side there seems to be a bottleneck as it doesnt seem to be possible to declare RaiseCallbackEvent twice (overload it ).

The problem is that the call back from eg clicking is ignored when the one that is executed periodically goes through. Should i be creating Threads for it ? I would have thought that it would have automatically done that for me.

[b1randon]

Thanks . I used a <iframe> that i made invisible .

  <iframe visible="false" runat="server" id="Reloadstuff"> </iframe>

and some java script for the call back .

 
function reLoad() 
{ 
  frm=document.getElementById("Reloadstuff")
  setTimeout("reLoad()",100000)// call reLoad every 20 seconds. 
  Reload()
 }
 

which is called with an on page load event.




So the page refreshes now. BUT i have another added problem ... Im already using async callbacks.

But on the c# side there seems to be a bottleneck as it doesnt seem to be possible to declare RaiseCallbackEvent twice (overload it ).

The problem is that the call back from eg clicking is ignored when the one that is executed periodically goes through. Should i be creating Threads for it ? I would have thought that it would have automatically done that for me.

You're way into the C# world now. That's got nothing to do with javascript. You probably won't get an answer in this forum.