Ayende @ Rahien

Hi!
My name is Oren Eini
Founder of Hibernating Rhinos LTD and RavenDB.
You can reach me by phone or email:

ayende@ayende.com

+972 52-548-6969

, @ Q c

Posts: 6,124 | Comments: 45,475

filter by tags archive

JavaScript Race Conditions

time to read 8 min | 1526 words

About a week ago I posted how to handle Multiple Cascadiong Drop Downs using MS Ajax. That worked, except sometimes it didn't work.

Took me a while to figure out that there was a race  condition there. Let me tell you, Javascript in the browser is not the language for tracking down threading issues. At any rate, here is the fix.

function changeOnParentChangeOnProductsToAvoidRaceConditions()

{

      var behaviors =  Sys.UI.Behavior.getBehaviors($('<%=Benefits.ClientID%>'));

      if(behaviors == null || behaviors.legth==0)

      {

            //wait for the behavior to be defined.

            setTimeout("changeOnParentChangeOnPoliciesToAvoidRaceConditions()", 10);

            return;

      }

      for( var i=0; i<behaviors.length;i++)

      {

            var behavior = behaviors[i];

            //required to get around race condition

            behavior._oldBenefitsOnParentChange = behavior._onParentChange;

            behavior._onParentChange = function()

            {

                  if( $('<%= Insurances.ClientID %>').selectedIndex == 0)

                  {

                        return;

                  }

                  behavior._oldBenefitsOnParentChange ();

            }

      }

}

Event.observe(window, 'load', function() {

      changeOnParentChangeOnProductsToAvoidRaceConditions();

}); 


Comments

Matt

Uh-oh, there's another bug...

line 4:

if(behaviors == null || behaviors.legth==0)

should be:

if(behaviors == null || behaviors.length==0)

length is missing the n.

Keep up the good work, my friend.

Comment preview

Comments have been closed on this topic.

FUTURE POSTS

  1. RavenDB 3.5 whirl wind tour: You want all the data, you can’t handle all the data - one day from now
  2. The design of RavenDB 4.0: Making Lucene reliable - about one day from now
  3. RavenDB 3.5 whirl wind tour: I’ll find who is taking my I/O bandwidth and they SHALL pay - 3 days from now
  4. The design of RavenDB 4.0: Physically segregating collections - 4 days from now
  5. RavenDB 3.5 Whirlwind tour: I need to be free to explore my data - 5 days from now

And 14 more posts are pending...

There are posts all the way to May 30, 2016

RECENT SERIES

  1. RavenDB 3.5 whirl wind tour (14):
    29 Apr 2016 - A large cluster goes into a bar and order N^2 drinks
  2. The design of RavenDB 4.0 (13):
    28 Apr 2016 - The implications of the blittable format
  3. Tasks for the new comer (2):
    15 Apr 2016 - Quartz.NET with RavenDB
  4. Code through the looking glass (5):
    18 Mar 2016 - And a linear search to rule them
  5. Find the bug (8):
    29 Feb 2016 - When you can't rely on your own identity
View all series

RECENT COMMENTS

Syndication

Main feed Feed Stats
Comments feed   Comments Feed Stats