Ajax Region Pull and checksum

I have the page, which consists the report, which has to be pulled using ajax. The problem is this page has the checksum enabled.
I've created the start and end of the report tags on this page (,).
I was able to generate the checksum but not sure how I can add it to the request for the report.
Here's the extract of the javascript code for the page:
var checksum=generate_checksum(url_params);
alert(checksum) // this part works fine
+//start ajax call+
var ajaxReq = new htmldb_Get (null,&APP_ID., null,2025);
ajaxReq.add('P2025_LIST_ID',list_id);
+...+
report_body=ajaxReq.get(null,'','');
The report body is returned only if checksum is removed.
BTW I thought I can stick it in the querystring parameter number 7 in htmldb_get but it does not work.
Have anybody done that ?
Thanks for your help
Mikhail

Mikhail,
I am concerned about your approach, because if you have a 'generate_checksum' JavaScript function that provides a way for you to generate a valid checksum on the client-side, what's to stop a hacker from calling that same function and easily circumventing the SSP protection on the target page?
Have you thought of either un-restricting the target page and adding some logic to your report query to try and protect the values (eg only show certain rows for certain users, etc), or if you really want to keep the protection level on this report page, switching to a simple full page submit?
Also, if you're on APEX 4.0, have you looked at using the 'Refresh' dynamic action? This has the same checksum restriction, but would be an easier and more supported way of approaching this in a partial page refresh way. Please see here for more geenral info. on how to do that:
http://anthonyrayner.blogspot.com/2010/07/report-filtering-with-apex-40-dynamic.html
Hope that helps.
Regards,
Anthony.

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Hi All,
I have tried implementing Carl Backstrom's excellent example Ajax region pull.... http://htmldb.oracle.com/pls/otn/f?p=11933:48:2576101578276736 and have been unable to get it to work. I have gone through it step by step but i still get a Javascript error relating to the function dhtml_GetReport(pThis). The error is "Object Expected on line 13" => var l_Val = html_SelectValue(pThis);
I have also included the files htmldb_html_elements.js and htmldb_get.js just in case you were wondering. We are using HTMLDB 1.6.1.00.02 if that could be the issue here.
Anyone come across this before?
Thanks.

Hello,
All those examples have been built for 2.0 and above.
Carl

AJAX region pull

I am using ajax to display a region from another page. This region has 2 text fields and a button that when pressed branches to another page. When I input the data and click the button I get an error:
Error Item ID (10060522396890067) is not an item defined on the current page.
Any suggestions?

Hello Stew,
As I suspected, your problem (and the others who started this thread) has nothing to do with the browser you are using, but in the way you are using the technique described by Carl, and was (of course) spotted correctly by Scott.
In my answer, I’m also referencing your post in here - Re: Partial refreshing of pages in 2.0 ?
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In your specific case, where the item – P20_CUST_ID – is a hidden one, the solution is very simple. Just set the condition of the item to ‘never’. That will prevent it from being rendered on page 20, so it will not be copied to page 2. I did that on your demo application, and now it seems to work just fine.
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Hi,
I have a page with two dynamic PL/SQL regions.
I want to refresh the second one without submit my page like the following example:
http://apex.oracle.com/pls/otn/f?p=11933:48:4181203731698424
here is the main of the example code.
var get = new htmldb_Get(null,$x('pFlowId').value,null,47);
gReturn = get.get(null,'<htmldb:BOX_BODY>','</htmldb:BOX_BODY>');
$x('ReportDrop').innerHTML = gReturn;
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If I copy my dynamic PL/SQL region to another page it works fine.
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I expected that I can use AJAX refresh for a region on the same page and I don't want to replicate it.
Thank you very much.
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Davide,
Interesting problem. One of the main reasons to use Ajax is to avoid a full page refresh because of all of the content that would need to be processed on the server side. If you didn't replicate the region alone on another page then you would not save any server side processing.
As for the bug, have you used Firebug to see exactly what the Ajax call is returning?
Regards,
Dan
http://danielmcghan.us
http://www.skillbuilders.com
You can reward this reply by marking it as either Helpful or Correct ;-)

Ajax Report Pull APEX_ITEM.DATE_POPUP issue

Hi all,
I am trying to use something similar to Carl's Ajax Region Pull
http://htmldb.oracle.com/pls/otn/f?p=11933:48:1222899842354681::NO:::
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Cheers
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Hello,
Using the built in form items pulled from ajax can cause alot of problems and is discouraged. In most cases when you pull a form item from one page into another page it will break your page when you try and submit it.
Now with the date pickers there is an even bigger issue because there is also embedded individual javascript's associated with each datepicker and when you pull them into the page the page DOM will not pick them up.
Regards,
Carl
blog : http://carlback.blogspot.com/
apex examples : http://apex.oracle.com/pls/otn/f?p=11933:5

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Hi,
I have an application working using ajax report pull.
Entire application is based on ajax and its currently released.
Its performance is good. It works fine with mozilla but in ie,
links and buttons are not working.
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document.getElementById("divlayer").style.display='block';
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Thanks,
Niveditha

Hello Niveditha,
There're some differences in browsers... so yes it's possible that it doesn't work with the same code in another browser. The good news is that most of time there're workaround.
When I look at your code, you could already change document.getElementById() by $x(), which is doing the same, but comes from the APEX framework.
Do you have an idea where it fails in IE? Are you using the Developer Toolbar? Maybe that gives you more insights. You could also put some alert('hello 1'); in your code to see what's happening and how far it comes.
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Dimitri
-- http://dgielis.blogspot.com
-- http://apex-evangelists.com

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Hi,
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both examples from Carl (http://htmldb.oracle.com/pls/otn/f?p=11933:48 and http://htmldb.oracle.com/pls/otn/f?p=11933:55)
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I cannot get the second taskflow to behave correctly in a dynamic region.
Here's my scenario:
In the pursuit of resusablilty, I have two taskflows that are coming from ADF Library Jars into a master application.
Both taskflows have their own associated application modules, which appear as data controls in the master project.
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{code:java}package view.beans;
public class DynamicRegionBean {
private String taskFlowId = "/WEB-INF/taskflow1.xml#first-taskflow";
public DynamicRegionBean() {
public TaskFlowId getDynamicTaskFlowId() {
return TaskFlowId.parse(taskFlowId);
public String firstTaskflowtaskflow() {
taskFlowId = "/WEB-INF/taskflow1.xml#first-taskflow
return null;
public String secondTaskflowtaskflow() {
taskFlowId = "/WEB-INF/taskflow2.xml#second-taskflow";
return null;
}{code}
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Edited by: lili5058 on Feb 7, 2009 12:56 PM
Edited by: lili5058 on Feb 7, 2009 5:06 PM

Hi,
chances are you are hitting a bug. But this is hard to say from here. If you want, we can further track the issue down. I suggest you exclude the use of ADF libraries and verify that the scenario works if the two taskflows work in the mentioned scenario of they are both defined in the project itself. If this works then it seems like a bug that should be filed. Can you verify this ?
Frank

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I've already successfully integrated and customized the code for both an AJAX and JAVA producer/consumer client in JMS (using ActiveMQ as the JMS broker and Tomcat as the webapp container). While both have been working well in separate projects, unfortunately, I'm having a bit of trouble trying to integrate them for the purpose of running an AJAX message listener and JAVA message listener in the same project.
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