iPhone displaying erratic behavior with executing javascript code

Question

iPhone displaying erratic behavior with executing javascript code

I need help with the following link:

<a href='external-url' class='track' data-type='event' data-category='category'>
   Link
</a>

Whenever the link is clicked, a specific function is triggered:

$('a.track').on('click', function(e){
   e.preventDefault();

   var type     = $(this).data("type");
   var category = $(this).data("category");

  track(type, category);
  window.location = $(this).attr("href");
});

The track function sends data via ajax and stores it in a database. It works perfectly on desktop browsers and Android devices.

However, I'm encountering an issue on iPhone where the link doesn't always add the data to the database when clicked. It seems to fail around 10 times, then start working for another 10 times randomly. Can anyone help identify what might be causing this issue? It could be related to my code or something specific to iOS that I have missed.

javascript iphone ios

Answer 1

Answer №1

Perhaps the issue lies in the asynchronous nature of the track() function.

In certain browsers, it might have completed its tasks quickly enough (or perhaps due to luck) before the execution of window.location. However, this behavior is quite unusual.

On an iPhone, there is a possibility that track() took too long to execute, resulting in window.location canceling the operation as the page was in the process of navigating to another page. This aligns with the expected behavior for asynchronous operations and should have been consistent across all browsers.

Instead of relying on sequential code, consider utilizing callbacks. By passing in a callback function, you can ensure that it only executes once the track operation has successfully completed:

function track(type, category, callback){
    // Track operations and ajax setup here
    // Execute callback upon receiving a response from ajax operation
    if(ajaxStatus === 200){
        callback();
    }
}

// Utilizing track by providing parameters and a callback function
// The callback will trigger the desired action upon completion
track(type, category, function(){
    window.location = ...;
});

Answer 2

Perhaps the issue lies in the asynchronous nature of the track() function.

In certain browsers, it might have completed its tasks quickly enough (or perhaps due to luck) before the execution of window.location. However, this behavior is quite unusual.

On an iPhone, there is a possibility that track() took too long to execute, resulting in window.location canceling the operation as the page was in the process of navigating to another page. This aligns with the expected behavior for asynchronous operations and should have been consistent across all browsers.

Instead of relying on sequential code, consider utilizing callbacks. By passing in a callback function, you can ensure that it only executes once the track operation has successfully completed:

function track(type, category, callback){
    // Track operations and ajax setup here
    // Execute callback upon receiving a response from ajax operation
    if(ajaxStatus === 200){
        callback();
    }
}

// Utilizing track by providing parameters and a callback function
// The callback will trigger the desired action upon completion
track(type, category, function(){
    window.location = ...;
});

Answer 3

Answer №2

Encountering a race condition can be tricky. One must rely on hope for the request to go through successfully.

Exiting the page prematurely can result in killing any open requests. Surprisingly, this issue may occur on desktop browsers as well. Placing it on a distant server with a slow network speed might prove that the requests won't make it through.

In the past, a while loop was a simple solution but unfortunately, Chrome and Firefox have eliminated that option.

If dealing with an external site, consider opening it in a new window while keeping your current site active.

Answer 4

Encountering a race condition can be tricky. One must rely on hope for the request to go through successfully.

Exiting the page prematurely can result in killing any open requests. Surprisingly, this issue may occur on desktop browsers as well. Placing it on a distant server with a slow network speed might prove that the requests won't make it through.

In the past, a while loop was a simple solution but unfortunately, Chrome and Firefox have eliminated that option.

If dealing with an external site, consider opening it in a new window while keeping your current site active.

iPhone displaying erratic behavior with executing javascript code

Answer №1

Answer №2

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