Problem with OnPostTransfer with IE & Ajax

AndyW · **Joined:** Mon Jul 09, 2007 7:17 am **Posts:** 4

Hi,

I have recently made changes to an application of ours to allow it to use AjaxPanels. Since I have made this change there has been problems getting OnPostTransfer to attach to the ActiveX object properly.

I have been using the following code to do it:

Code:

<SCRIPT language="javascript" event="OnPostTransfer" for="DynamicWebTwain1"> 
<!-- 
   UploadBatch(); 
//--> 
</SCRIPT>

Which has worked fine until now. Now that the ActiveX control is living in an Ajax Panel the above code calls UploadBatch() only when the page loads and not when OnPostTransfer is called. This is only affecting the ActiveX control, the plugin is working correctly (using the example code on the Dynamsoft site).

Is there any other way I can attach my function to the OnPostTransfer event?

Thanks,
Andy

Robert · **Joined:** Mon Mar 07, 2005 11:11 pm **Posts:** 866

Do you want to call UploadBatch when the OnPostTransfer event is fired? If yes, please try the following code and see if it works fine.

Code:

<SCRIPT ID=clientEventHandlersJS LANGUAGE=javascript>
<!--
function DynamicWebTwain1_OnPostTransfer() {
   UploadBatch ();
}
//-->
</SCRIPT>

<SCRIPT LANGUAGE=javascript FOR=DynamicWebTwain1 EVENT=OnPostTransfer>
<!--
 DynamicWebTwain1_OnPostTransfer();
//-->
</SCRIPT>

As this topic is about Dynamic Web TWAIN, I will move it to Dynamic Web TWAIN forum in 1 business day.

Thanks.

AndyW · **Joined:** Mon Jul 09, 2007 7:17 am **Posts:** 4

Oops, didn't realise I had posted it in the wrong forum, sorry

I tried the code snippet you posted but the same problem has occured, I think there is something in the javascript / code of the AjaxPanel that is ignoring the FOR and EVENT parameters for the SCRIPT tag and as such the DynamicWebTwain1_OnPostTransfer(); funciton is being called staight away when the page is loaded instead of attaching it to the OnPostTransfer event.

This isn't really a Dynamic Web Twain problem as such, I was just curious if there was another way of attaching a function to the OnPostTransfer event.

Robert · **Joined:** Mon Mar 07, 2005 11:11 pm **Posts:** 866

Quote:

This isn't really a Dynamic Web Twain problem as such, I was just curious if there was another way of attaching a function to the OnPostTransfer event.

We will look into this issue. If we have any solution, we will update you.

Thanks.

AndyW · **Joined:** Mon Jul 09, 2007 7:17 am **Posts:** 4

I've managed to find a solution for my problem, using the following function:

Code:

    var addListener = function() {
        if ( window.addEventListener ) {
            return function(el, type, fn) {
                el.addEventListener(type, fn, false);
            };
        } else if ( window.attachEvent ) {
            return function(el, type, fn) {
                var f = function() {
                    fn.call(el, window.event);
                };
                el.attachEvent(type, f);
            };
        } else {
            return function(el, type, fn) {
                element[type] = fn;
            }
        }
    }();

I then attach the function I require using:

Code:

twain=document.getElementById("DynamicWebTwain1");
addListener(twain, 'OnPostTransfer', UploadBatch);

And this works perfectly in IE6/7. Hope this might be useful for any others who have this problem.

Robert · **Joined:** Mon Mar 07, 2005 11:11 pm **Posts:** 866

I am glad to see the issue has been resolved. And thank you so much for your solution.

Thanks.

azadam · **Joined:** Fri Jan 14, 2011 12:11 pm **Posts:** 4

This is an old posting but I'm attempting to accomplish something similar. I've had perfect success using this approach to attach events to the ActiveX control running on IE, but I'm unable to achieve the same result with the embedded add-on using Firefox.

Has anyone found a solution that works with Firefox as well?

Catherine · **Joined:** Tue Mar 08, 2005 12:23 am **Posts:** 1075

Hi azadam,

azadam wrote:

This is an old posting but I'm attempting to accomplish something similar. I've had perfect success using this approach to attach events to the ActiveX control running on IE, but I'm unable to achieve the same result with the embedded add-on using Firefox.

Has anyone found a solution that works with Firefox as well?

We did some tests and it turned out that the method "addEventListener" can't attach the events of Dynamic Web TWAIN to the embedded Plug-in. Currently, we recommend that you attach the events in the normal way:

Code:

          <embed id="DynamicWebTwainFF" 
            TYPE="Application/DynamicWebTwain-Plugin"
            
            OnImageAreaDeselected="DynamicWebTwain_OnImageAreaDeselected"
            OnImageAreaSelected="DynamicWebTwain_OnImageAreaSelected"
            OnInternetTransferPercentage="DynamicWebTwain_OnInternetTransferPercentage"
            OnInternetTransferPercentageEx="DynamicWebTwain_OnInternetTransferPercentageEx"
            OnMouseClick="DynamicWebTwain_OnMouseClick"   
            OnMouseDoubleClick="DynamicWebTwain_OnMouseDoubleClick"   
            OnMouseMove="DynamicWebTwain_OnMouseMove"   
            OnMouseRightClick="DynamicWebTwain_OnMouseRightClick"   
            OnPreAllTransfers="DynamicWebTwain_OnPreAllTransfers"
            OnPreTransfer="DynamicWebTwain_OnPreTransfer"
            OnPostTransfer="DynamicWebTwain_OnPostTransfer"
            OnPostAlltransfers="DynamicWebTwain_OnPostAllTransfers"
            OnTopImageInTheViewChanged="DynamicWebTwain_OnTopImageInTheViewChanged"
            OnTransferCancelled="DynamicWebTwain_OnTransferCancelled"
            OnTransferError="DynamicWebTwain_OnTransferError"

            style="text-align:center;height: 480px; width: 500px"
            PLUGINSPAGE="DynamicWebTwain.xpi">      
         </embed>

If you need any further help, please let me know.

Jason · **Joined:** Fri Jul 22, 2011 7:13 am **Posts:** 14

Has there been any progress on this addEventListener() issue since 2005? I believe that I'm experiencing this same issue now. Because we need to add this plugin to the page dynamically, connecting the events via attributes is problematic.

azadam · **Joined:** Fri Jan 14, 2011 12:11 pm **Posts:** 4

Jason wrote:

Has there been any progress on this addEventListener() issue since 2005? I believe that I'm experiencing this same issue now. Because we need to add this plugin to the page dynamically, connecting the events via attributes is problematic.

I still haven't been able to attach dynamically but would like to know if it's going to be possible. I worked around the issue by creating globally scoped function stubs that are referenced by the object when I put it on the page dynamically, but I'd prefer to clean that up if possible.

Jason · **Joined:** Fri Jul 22, 2011 7:13 am **Posts:** 14

I was able to get part of the way by defining

Code:

window.DynamicWebTwain_OnImageAreaDeselected = function (event) { };

but event is not provided - I was hoping that FireFox inserts this, but no such luck. If I had the sender of the event, I'd be able to process it correctly, but since I don't have the sender of the event, I cannot route the event handling properly.

The reason for all this hassle is that we have a primarily javascript-based user interface with modules that can be added or removed from the page at will.

Unless this is solved, I have to create and maintain unique names for these handlers such as

Code:

window['DynamicWebTwain_OnImageAreaDeselected'] = function () { self_as_closure.whatever() };

Catherine · **Joined:** Tue Mar 08, 2005 12:23 am **Posts:** 1075

Hi Jason,

To look into this issue more closely, shall we have an online meeting? If it is convenient for you, you can contact our support team via Live Help first:
http://www.dynamsoft.com/Support/livehelp.aspx

Dynamsoft TWAIN Products

Problem with OnPostTransfer with IE & Ajax

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