mImageViewer.readyState != 4 loop is 15 seconds slowRSS

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  adamturner34

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  mImageViewer.readyState != 4 loop is 15 seconds slow

  Feb 06, 2017 08:19 PM|adamturner34|LINK

  Hi Folks,

  I have a recursive call that checks the readystate of an object and I confess that I haven't worked with <object>'s in the past.

  I'm curious to know if this recursion is a necessary evil and if there is a way to speed it up or is this considered good practice? Currently it's taking roughly 15 seconds to return a successful readystate.

  function ProcessWPOpen(counter, xml)
  {
      //debugger;
      
      try {
          var mImageViewer = $('#WinFormsDocumentView');
          if (mImageViewer.readyState != 4 && counter < 60) {
                  counter++;
                  window.setTimeout("ProcessWPOpen(" + counter + ")", 250);
                  return;
              }
         
      }
      catch (ex) {
          counter++;
          window.setTimeout("ProcessWPOpen(" + counter + ")", 250);
          return;
      }
  }

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  bruce (sqlwo...

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  Re: mImageViewer.readyState != 4 loop is 15 seconds slow

  Feb 06, 2017 09:02 PM|bruce (sqlwork.com)|LINK

  as your counter forces a min 15 second delay, it can never be quicker than 15 seconds. you could use the onreadystatechange event

  (function() {
      var obj = $('#WinFormsDocumentView')[0];
      obj.onreadystatechange = function() {
         if (obj.readyState == 4) {
            //do something
         }
      };
  })();

  
  ;

  bruce (sqlwork.com)
• • Reply
  adamturner34

  Contributor

  2853 Points

  1372 Posts

  Re: mImageViewer.readyState != 4 loop is 15 seconds slow

  Mar 09, 2017 08:12 PM|adamturner34|LINK

  How do you handle a failure to load and a reasonable time to notify the user of a problem?

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  PatriceSc

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  Re: mImageViewer.readyState != 4 loop is 15 seconds slow

  Mar 09, 2017 08:35 PM|PatriceSc|LINK

  Hi,

  I would try https://www.w3schools.com/jsref/event_onerror.asp (not sure which kind of error you want to report).

  Not directly related but if youe have to keep your current approach, setInterval might be better.