ASP.NET

using timer to refresh gridview

3-Jun-09 23:53

I would assume that this means it makes the request, then continues. You need to figure out if you can catch an even when the get has ended, and show your message there.

One way to do this, is to put something in the URL that tells it to inject the alert in the page that is being sent.

Christian Graus

Driven to the arms of OSX by Vista.

Please read this[^] if you don't like the answer I gave to your question.

"! i don't exactly like or do programming and it only gives me a headache." - spotted in VB forums.

Arif Liminto3-Jun-09 22:53

Arif Liminto

3-Jun-09 22:53

Hi guys,

I am still newbie in asp.net

I want to refresh gridview every 30 seconds using timer
and I have got the problem with calling non-static function to databind the gridview.
here is example of my code

<br />
Timer AlertTimer = null;<br />
 protected void Page_Load(object sender, EventArgs e)<br />
 {<br />
   //load to gridviewAlarm for the first time<br />
   Alert a = new Alert();<br />
   DataTable dt = new DataTable();<br />
   a.LoadAlarmFromDB(ref dt);<br />
   gridviewAlarm.DataSource = dt;<br />
   gridviewAlarm.DataBind();<br />
<br />
   AlertTimer = new Timer();<br />
   AlertTimer.Start();<br />
   AlertTimer.Elapsed += new ElapsedEventHandler(AlertTimer_Elapsed);<br />
   AlertTimer.Interval = 30000;<br />
<br />
}<br />
    public static void AlertTimer_Elapsed(object source, ElapsedEventArgs e)<br />
    {<br />
           Alert a = new Alert();<br />
           DataTable dt= new DataTable();<br />
           a.LoadAlarm(ref dt);<br />
<br />
           <br />
           //in here how to call bindGridView()<br />
           // i have tried those below<br />
           //but it doesnt work<br />
          <br />
<br />
           //Test_MasterPage M = new Test_MasterPage();<br />
           //M.bindGridView();<br />
<br />
    }<br />
    public void bindGridView()<br />
    {<br />
        gridviewAlarm.DataSource = "";<br />
        gridviewAlarm.DataBind();<br />
        gridviewAlarm.DataSource = m_AlarmDT;<br />
        gridviewAlarm.DataBind();<br />
    }<br />

how do i call non static function in static function?
thanks so much for the help

Regards,

Arif

K03063-Jun-09 23:05

K0306

3-Jun-09 23:05

I think you can not able to call a non-static method from a static method,may be you can change your static function to normal function or you can change the normal function into a delegate function.

Christian Graus3-Jun-09 23:27

3-Jun-09 23:27

You are kind of right, and yet, utterly wrong.

Christian Graus3-Jun-09 23:28

3-Jun-09 23:28

arifliminto86 wrote:
I am still newbie in asp.net

I see that. You're obviously not writing commercial code, this isn't good enough for a beginners class. So, I suggest you either take a class, or buy a book and work through all of it. If you're writing commercial code, then you're a liar and a thief.

Your basic problem is that you don't have the slightest clue how ASP.NET works. Your server is doing NOTHING after your page is delivered. To get a page to auto refresh, you need a timer on the client, not on the server.

Brian W King4-Jun-09 2:20

Brian W King

4-Jun-09 2:20

Christian Graus wrote:
Your basic problem is that you don't have the slightest clue how ASP.NET works. Your server is doing NOTHING after your page is delivered. To get a page to auto refresh, you need a timer on the client, not on the server.

Perhaps you ought to rephrase that. There is actually a method to refresh a page WITHOUT a timer AND from the client. Add the following meta tag to your page;

<meta http-equiv="refresh" content="900;URL={the fully qualified url of the page to be refreshed}" />

'900' represents the amount of time between refreshes.

Check Box as Toggle

CodingLover3-Jun-09 20:54

CodingLover

3-Jun-09 20:54

Hi All,

I want to have a toggle images, so I did this.

<br />
<asp:TemplateField HeaderText="Start/Stop"><br />
                    <ItemTemplate><br />
                        <asp:CheckBox ID="chkStatusTogel" runat="server" <br />
                            OnCheckedChanged="chkStatusTogel_CheckedChanged" AutoPostBack="false" /><br />
                        <ajaxToolkit:ToggleButtonExtender ID="ToggleEx" runat="server"<br />
                            TargetControlID="chkStatusTogel" ImageWidth="16" ImageHeight="16"<br />
                            CheckedImageAlternateText="Stop" UncheckedImageAlternateText="Start"<br />
                            CheckedImageUrl="images/exit.png" UncheckedImageUrl="images/run.png" /><br />
                    </ItemTemplate><br />
                </asp:TemplateField><br />

I can toggle between images. Now I want to handle the checked event.

But I've a big problem here. If I set the AutoPostBack to false, I cannot catch the CheckedChange event. If I set AutoPostBack to true, I can catch the event, but page refreshed automatically. I don't want that. How can I solve this.

Please help me, I'm new to ASP. Smile | :)

Thanks

I appreciate your help all the time...
CodingLover Smile | :)

Re: Check Box as Toggle

Christian Graus3-Jun-09 21:00

javascript for disable back button

3-Jun-09 21:00

I guess you want to try to use AJAX. I don't think newbies should use AJAX until they understand ASP.NET, however.

Re: Check Box as Toggle

Brian W King4-Jun-09 2:33

Brian W King

4-Jun-09 2:33

Sounds like a job for Java or DHTML (really java too, although that statement raises the hackles on some). There are a large number of situations that require you to slide java in the middle of the process specifically becuase of the type of action(problem) you describe.

AJAX is simply more complex java code already rolled up for you to produce some nice 'effects' and functionality. It's nothing more than that though. An understanding of java helps dramatically in using AJAX, but is not necessary (as they are really the same thing).

Write a quick little java applet to switch your images and place the name of your java routine in the onclick attribute of the asp checkbox tag. Its really that simply and pretty neat once you get the hang of it. Search for some 'MouseOver' java code in aspx if you need examples. They are pretty easy to whip into what you need.

Kissy163-Jun-09 20:53

Kissy16

3-Jun-09 20:53

hai all,
am adding the following code in html for disabling the back button.
but am need to call this function on pageload?
If to call,how to do that?
Am just added in html and tested but its not working.
Please let me know if any of u know the solution
My code is here

function StopBackward()
{
window.history.back(-1);
}

kissy

Christian Graus3-Jun-09 21:00

3-Jun-09 21:00

You're living in a fantasy. You can't stop the user going back. Instead, you should fix your overall design.

Jay Royall3-Jun-09 22:33

Jay Royall

3-Jun-09 22:33

For what reason do you want to disable the back button? Many, including myself, use the back button often and I would consider it to be a usability issue if I couldn't go back a page easily.

Kissy163-Jun-09 23:00

Kissy16

3-Jun-09 23:00

thanks for ur answers.
Ex:If menu contains,
page1
page2
page3 and logout page.
after login,he can go to page2 and page1 with back button,but from page1 he should not go to login page with browsers.With logout only he can go back to login page.
once user login,and reached main menu page,until unless he clicked on the logout,he should not go back to the login page by clicking on the browers back button.

This is my requirement.Please let me know if any one of u understand and had solution.

kissy

Jay Royall3-Jun-09 23:28

Jay Royall

3-Jun-09 23:28

Just as long as the page isn't cached then you can handle what to do in the one of the page events (not sure of the best one, maybe page_load?).

That is, if the user is logged in and he/she tries to go back to the login page then hide the login form and maybe show a message saying 'Already Logged In' or something. If the user has logged out and he/she tries to go back to a secured page then re-direct to the login page.

I think you can set whether to cache the page or not using the Response object.

Christian Graus3-Jun-09 23:36

3-Jun-09 23:36

Like I said, if you fix your site, then you will solve your problem. Write good code, don't try to hack your way through bad code.

Kissy164-Jun-09 0:10

Kissy16

4-Jun-09 0:10

thanks for ur answer,but i dont understand ur idea.
how to fix the design.
What exactly i have to do.
I think u got my question and please try to explain me correctly.
please it is my request.

kissy

Brian W King4-Jun-09 2:40

Brian W King

4-Jun-09 2:40

Try this out;

protected void Page_load
{
StringBuilder javaScript = new StringBuilder();

javaScript.Append("\n<script language=JavaScript>\n");
javaScript.Append("window.history.forward(1);\n");
javaScript.Append("</script>\n");

Page.RegisterClientScriptBlock("HistoryScript", javaScript.ToString());
}

Its a bit of a trick, but works for me. The real problem is that newer browsers purposefully remove the ability for code to effect the menus of the browser now as some nasty hackers keep finding ways to hijack the browser using these methods. Probably the code above will become useless after a time too when someone starts to use it in-appropriately and we will have to creatively come up with a new method. Just be cautious in how you apply it. Cool | :cool: