Preventing Excessive Event Triggering in a PhoneGap - Jquerymobile Application

Question

Preventing Excessive Event Triggering in a PhoneGap - Jquerymobile Application

I've created an application using a combination of Phonegap and JqueryMobile.

So far, this app has accumulated approximately 15,000 downloads across iOS, Android, and iPhone platforms. Surprisingly, the code remains consistent across all versions.

Periodically, my backend server becomes overwhelmed and after checking the logs, I notice that a single user is making repeated calls to the server. (These users are genuine individuals with whom I have already discussed the problem - ruling out the possibility of bots.)

It appears that either the click event or the server call is stuck in a loop, but I am struggling to determine the exact cause.

This issue has afflicted only three users out of 15,000 (as far as I am aware), and these particular users had previously navigated through the app without incident. Furthermore, the problem arose on both Android and iOS, suggesting a potential flaw within jquerymobile/javascript functions.

Do you have any insights into what might be triggering this recurring problem?

javascript events jquery-mobile cordova

Answer 1

Answer №1

It's important to be mindful of design issues in your JavaScript and DOM generation.

If you bind an event that has already been bound, jQuery will bind it again without checking if the event has already been bound. This is useful if you want to attach multiple event functions to the same event.

There are a few ways to address this issue. One option is to unbind the event before binding it using $.off(), like so:

$("#myDiv").off("click").on("click", function(e) {
    // ...
})

Another approach is to check within the event function itself if the event has already been triggered, for example:

$("#myDiv").on("click",function(e) {
  if(e.handled !== true) {
      alert('Clicked');
      e.handled = true;
  }
})

For more solutions and their advantages and disadvantages, visit this link.

Answer 2

It's important to be mindful of design issues in your JavaScript and DOM generation.

If you bind an event that has already been bound, jQuery will bind it again without checking if the event has already been bound. This is useful if you want to attach multiple event functions to the same event.

There are a few ways to address this issue. One option is to unbind the event before binding it using $.off(), like so:

$("#myDiv").off("click").on("click", function(e) {
    // ...
})

Another approach is to check within the event function itself if the event has already been triggered, for example:

$("#myDiv").on("click",function(e) {
  if(e.handled !== true) {
      alert('Clicked');
      e.handled = true;
  }
})

For more solutions and their advantages and disadvantages, visit this link.

Answer 3

Answer №2

By deactivating the button on initial click, I successfully resolved the problem at hand.

The root cause appeared to be double tapping the button, leading to an unexpected infinite loop that was difficult to diagnose.

Answer 4

By deactivating the button on initial click, I successfully resolved the problem at hand.

The root cause appeared to be double tapping the button, leading to an unexpected infinite loop that was difficult to diagnose.

Answer 5

Answer №3

Are you implementing event.preventDefault() and event.stopPropagation() in your onclick function? It's important to ensure consistent browser behavior.

In addition, consider hiding or disabling buttons at the start of the onclick function to prevent users from making multiple clicks.

I'm sure you're already on top of this, but it never hurts to double check...

Answer 6

Are you implementing event.preventDefault() and event.stopPropagation() in your onclick function? It's important to ensure consistent browser behavior.

In addition, consider hiding or disabling buttons at the start of the onclick function to prevent users from making multiple clicks.

I'm sure you're already on top of this, but it never hurts to double check...

Preventing Excessive Event Triggering in a PhoneGap - Jquerymobile Application

Answer №1

Answer №2

Answer №3

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