Forum Discussion

Brentp's avatar
Brentp
Occasional Contributor
10 years ago

Permission Denied - when attempting to use Exists.

I'm running in to an intermittent problem (10% of the time) where myControl.Exists is giving me a Microsoft JScript runtime error.  I run in to in several places in my code, but one such example is w...
leandroaraujoso's avatar
leandroaraujoso
Contributor

Hi Brentp,

 

Easy as pie :) 

According to this article http://support.smartbear.com/viewarticle/55745/, the method FindChildByXPath return Null in JScript when the element is not found. So, you should make sure the page is fully loaded before using this method.

What is happening in your case is that sometimes (when the error occurs), the application's response time is a little bit higher than when everything run smoothly.

 

Best regards,

 

Leandro de Araújo Souza

 

 

Brentp's avatar
Brentp
Occasional Contributor
10 years ago

I've tried using .Wait and .WaitPage, but it's not working because the page is actually there already.

 

Here is the timeline of the page as I understand it.

 

1- Page is available prior to any updates

2- I initiate the command which goes out to the DB to obtain the updated information.  The page is still "there", just not updated because the DB is retrieving the information and the update hasn't started yet. During this stage .Wait finds the page because it's already there, just not fully updated.  Since it finds the page, the next command in my script executes and crashes.

3-the page is loading/updating the HTML.  During this stage I suspect that .Wait would work.  

4- the page is fully loaded and updated again.

 

I think the error occurs when I am trying to access the page between stage 3 and stage 4.  

 

If I use the .Wait by initiating it at the end of stage 2 it 'finds' the not updated page in stages 2/3 rather than waiting until stage 4 is done. I'm not seeing a way to initiate the .Wait later than stage 2 without some hacky aqUtils.Delay.   

 

thanks,

Brent

 

 

 

    • Brentp's avatar
      Brentp
      Occasional Contributor
      10 years ago

      Thanks Leandro.  A modified version of this worked for me.  The page elements do not refresh in the same order each time so I had to FindChildByXPath and test for null with a rather long xpath statement prior to being certain the necessary page components had loaded. 

       

      In the event that anyone else runs in to this, here is the function I used.  Perhaps there is a more elegant way to do this, but it seems to work.  

       

      Thanks,

       

      Brent

       

      //xpathToFind = the xpath statement defining the items that need to be found only when the page is loaded, but not while updating

      function WaitForWindowToFullyLoad(pageToWaitFor, xpathToFind, timeout)
      {
      if(timeout == undefined)
      {
      timeout = 60000;
      }
      var stopTime = GetTickCount() + timeout;
      var found = pageToWaitFor.FindChildByXPath(xpathToFind);

      while (GetTickCount() < stopTime)
      {
      if(found == null)
      {
      aqUtils.Delay(500);
      found = pageToWaitFor.FindChildByXPath(xpathToFind);
      }
      else
      {
      break;
      }
      }
      return 1;
      }