Question

87

jQuery exception handling

rated 0 times [ 94] [ 7] / answers: 1 / hits: 15659 / 14 Years ago, mon, june 21, 2010, 12:00:00

Is there any way I could catch any uncaught exception in javascript? I mean, all my dangerous code are in try-catch blocks. But what about exceptions that I don't handle explicitly? I'm using jQuery, my main javascript file starts with :

$(document).ready(function(){})

here I bind some events to some DOM elements. I can use try-catch blocks here, but they will catch exceptions that occur during the event binding procedure, not during the event handling. But if I used try-catch blocks in every event handling functions it would be ugly.

How should I catch exceptions that don't occur in my explicit try-catch blocks? (I don't want to write a general handler function, I just want to send the problem to my server)

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answered 14 Years ago parisc · Accepted Answer

You could write a function that would wrap your real handlers in a try/catch

function tc(func, msg) {

  msg = msg || Handler exception;

  return function(e) {

    try {

      return func(e);

    }

    catch (exc) {

      $.post( /* send exception to server? */ );

      throw exc; // let nature take its course

    }

  };

}

(Might want to get fancier with argument handling etc.) Then when you bind handlers you'd do:

$('#whatever').click(tc(function(e) {

  // your handler function

}, This is the message sent to the server when this handler fails));

Also, if you want to make sure this in the handler behaves as before, you can do func.apply($(this), e) instead of just func(e).