Javascript popup window question

[jonpfl]

All,

I am using javascript (window.open()) to create a popup to do some processing. This popup is going to create a PDF which can take anywhere from 10 secs to 2 mins (alot of backend SQL calls) and I was hoping to use this popup to show the user that something is going on (animated gif) and give them the ability to use the parent window to do other things in our system (while the popup is creating the PDF on the server).

My problem lies in the fact that while the popup is creating the PDF, the parent window cannot navigate to other pages (until the popup window is done). Is there any way to disassociate the popup window with the parent window so a user will be able to navigate with the parent window while the popup window is processing?

Thx
jonpfl

[gits]

you could send an AJAX-call and just open the window when the server sends the response ... this is done in the onreadystatecha nge-callback - first just have a look at a basic AJAX-example and ask more questions about it when you have them :)

kind regards

[jonpfl]

I have never used ajax before.

Is there a way to do with just javascript or am I going to have to get ajax?

Thx
jonpfl

[gits]

AJAX is just javascript ;) ... by making use of the browsers XMLHttpRequest and its asynchronous behaviour ... with that you could achieve what you want ...

kind regards

[jonpfl]

AJAX is just javascript ;) ... by making use of the browsers XMLHttpRequest and its asynchronous behaviour ... with that you could achieve what you want ...

kind regards

Ok, let me get this straight.

If I incorporate Ajax on my child/popup to create the PDF, my user is going to be able to go to the parent window and navigate to another page while the child/popup is awaiting a response from the server?

Sorry if this is a total newbie question but I am new at this.

Thx
jonpfl

[gits]

not exactly ... basicly you start a async XMLHttpRequest and say: open the window when you are ready ... the user may do whatever he wants in the meantime ...

[jonpfl]

not exactly ... basicly you start a async XMLHttpRequest and say: open the window when you are ready ... the user may do whatever he wants in the meantime ...

Now that you tell me this, I think I might want to do it another way (tell me which ones are feasible)

1) User is on page1.asp and clicks a button to create a PDF. I use javascript to send an async call to the server to start creating the PDF (it is all vbscript with a bunch of stored procs). While the PDF is being created, I assume the user can navigate to page2.asp and do something else, correct? I was thinking that instead of using a popup window when completed, I could just email them the PDF using vbscript on the server. Does this sound doable? I assume I do not actually have to have a callback function, right?

2) If I decide to use a popup window and user makes the request on page1.asp and has now changed to page2.asp, how would I handle that? I assume every possible page the user could navigate to in our internal app, I would have to have that callback function declared in the javascript, right? We currently have an include file called common.asp that I could it in since all our pages include that.

Is there a specific version of Ajax you recommend for ASP? Right now, I am reading up on one called "Sarissa"

Thx
jonpfl

[gits]

i think your first version sounds quite good ... but to clarify something: the callbackfunctio n is passed to the requestobject itself ... it mustn't be declared on every page ... and there is nothing like an ajax-version or something similar ... it is just javascript and xml and an instance of the XMLHttpRequest-Object of a browser ... there are just some frameworks out there that encapsulate the usage of all of this ...

[jonpfl]

i think your first version sounds quite good ... but to clarify something: the callbackfunctio n is passed to the requestobject itself ... it mustn't be declared on every page ... and there is nothing like an ajax-version or something similar ... it is just javascript and xml and an instance of the XMLHttpRequest-Object of a browser ... there are just some frameworks out there that encapsulate the usage of all of this ...

Ok, I put some ajax in my javascript code

            http_request = new XMLHttpRequest();
            sURL = "ReportHeading=" + frmCreditReport.ReportHeading.value;
            sURL += "&MeetingId=" + frmCreditReport.MeetingId.value;
            http_request.onreadystatechange = jon;
            http_request.open('POST', "popup_pdf.asp?" + sURL, true);
            http_request.send(null);
 
function jon()
{
    if (http_request.readyState == 4)
    { 
        alert(http_request.responseText);
    } 
}
 

And I can see that the PDF is getting created (I save it to a temp directory) but I still have the problem of not being able to navigate to another page. When I try to change to another page, my page waits until the Ajax is complete before continuing.

What am I doing wrong?

Thx
jonpfl

[gits]

is it a large pdf? ... what if you just alert a string like 'foo'? may be the problem is the transfer of the response data and not the pdf-creation at all? presenting a download-link or send it per mail as you already suggested would workaround that?