Eric Wise

I am having a little trouble figuring out what to put in the argument parameter. I want to perform the month selection postback of the calendar control. I looked at the source and I can do this.

Calendar1.Attributes.Add("onclick", Page.ClientScript.GetPostBackEventReference(Calendar1, "R255731"));

The argument works for the current month, but if I change months the argumant changes and I get an error. that function is great instead of hard coding that long name with the $'s, but without knowing how to generate the argument, it's not useful in my case.

Steve,

I am not sure if this will point you in the right direction.

But I am currently using this method to invoke server side function via client side javascript. I have a textbox that has "PostBack" set to "false", and use javascript

to capture user keycode. Whenever a "Enter" key is pressed, I will manually invoke a postback. And process it on server side.

I do it this way:

1) Add a

   GetPostBackEventReference(TextBox1,"");

   in the OnInit block.

This is not for postback purpose, but adding this will make .NET to generate a "__doPostBack" client side javascript.

2) Capture user "Enter" key press keycode, and manually cause postback.

   "__doPostBack('TextBox1', 'AutoNumber')".

3)  In code behind, use

   //Get the Control Name you use in the __doPostBack, in this case it is "TextBox1"

   Request.Params.Get("__EVENTTARGET"); //This will return "TextBox1"

   //Get the argument you use in the __doPostBack, in this case it is "AutoNumber"

   Request.Params.Get("__EVENTARGUMENT"); //This will return "AutoNumber"

4) In code behind pass these two parameter "TextBox1" and "AutoNumber" to  your function for further processing. In my case, I will generate the number if the parameter passed to my code behind function is "TextBox1" and "AutoNumber".

I hope this helps.

I need a confirmation message to be added on clicking on a button in specipic cases only....

and he clicked okey,i need a certain action to occur.....

If you know how this could be done...please help me....

Thanks ,

try this, it runs from a button control on my page but you can just change the controls name:

StringBuilder sb = new StringBuilder();

sb.Append("<script language=JavaScript>");

sb.Append("var con = confirm('It appears that you have just caused a problem'); ");

sb.Append("if(con){");

//get postback ref to control

sb.Append(Page.GetPostBackEventReference(ButtongotoViewDetails));

sb.Append("}else{alert('cancel clicked');}");

sb.Append("</script>");

Page.RegisterStartupScript("myscript", sb.ToString());

I also wasnt aware of the GetPostBackEventReference function. The code produced in the background is just to messy, so I never paid attention until I had to disable a button so the user could not click twice to start over the process on the server. The classic application would be a a payment button where when the user clicks twice she is billed twice. GetPostBackReference did the Job.

btnBack.Attributes.Add("onclick", GetPostBackEventReference(btnBack) & ";this.value='Please wait...';this.disabled = true;")

Nice hu :)

good one

I think your friend's solution works because he disables button before and he avoids the intrinsec autoPOST of the object imagebutton. (the imagebutton inherits from basebutton of html wich generate a post when clicked)

if you try with image

(not button or imagebutton and obviously adding getpostbackeventreference to attribute "onclick" in substituton of button.OnClientClick) you can get same result with 1 only postback and without disabling the control.

I also am using something similar to

btnBack.Attributes.Add("onclick", GetPostBackEventReference(btnBack) & ";this.value='Please wait...';this.disabled = true;")

to disable an image button so I dont allow the user to submit an order more than once on my site.  What I cant figure out is - what if there is no OnClick() method defined in the markup for this imagebutton?  What I see is that my page is posted back and I lose all of my data on the page.  Is there a way to check for this condition before I do the GetPostBackEventReference()?  I have searched everywhere and cannot find an answer.