Double request being sent by Ajax

Sample URL:

Note: Please use the test sign in credentials: test/test for username/password.

I am currently working on an AJAX request to fetch data from a database. The serverTime.php file appears to be functioning correctly as it is inserting and returning the expected responseText.

However, I have noticed that the request is being triggered twice. This was evident when debugging with Firebug. As a result, the page seems to 'reset' in some way, causing my cursor to lose focus from the current textbox. Additionally, even if my message is not empty, the URL shows "localhost/twitter/index.php?message=". I would like to resolve this minor issue before it escalates into a major problem.

Below is the JavaScript code. ajaxRequest represents my XMLHTTPRequest object. Any assistance would be greatly appreciated!

// Function to handle data received from the server
ajaxRequest.onreadystatechange = function(){
    if (ajaxRequest.readyState == 4){
        document.getElementById('output').innerHTML = ajaxRequest.responseText;
    }
}
// Build query string
var message = document.myForm.message.value;
var queryString = "message=" + message;

// Send AJAX request
ajaxRequest.open("GET", "serverTime.php" + "?" + queryString, true);

ajaxRequest.send(null);

Thank you,

Paragon

Answer №1

This situation is not unfamiliar to me, and in my experience, the culprit has often been firebug. To troubleshoot, I recommend disabling firebug and trying to submit the request again. You can use tools like Fiddler or other means to confirm that the request is only being executed once.

Answer №2

When I implement AJAX functions in JavaScript, a key strategy I use is maintaining a state variable to control the timing of requests. This prevents multiple requests from being sent simultaneously and ensures that each request is handled properly. To achieve this, follow these steps:

  1. Start by setting an inProgress variable to false.
  2. Prior to calling ajaxRequest.send(), switch inProgress to true. Ensure that you only call ajaxRequest.send() when inProgress is set to false.
  3. Within ajaxRequest.onreadystatechange(), reset inProgress back to false once the request reaches state 4.

However, there are scenarios where queuing actions becomes necessary. In such cases, simply ignoring requests while another one is in progress may not suffice. Here's my recommendation for handling queued actions:

  1. Begin by initializing an ajaxQueue as an empty global array.
  2. Before triggering ajaxRequest.send(), add the request to ajaxQueue.
  3. In the ajaxRequest.onreadystatechange() function, check if the request has reached state 4. If it has, remove the serviced request from the queue. Then, if ajaxQueue still contains pending requests (array size > 0), extract another request from the queue and invoke send() on that object.

Answer №3

After some troubleshooting, I discovered that the issue I was facing had nothing to do with AJAX. It turned out to be a minor and unusual problem related to how my form handled the Enter key in textboxes. Strangely enough, having two textboxes allowed me to submit without reloading the page, but with just one textbox, the page would refresh.

To improve reliability, I decided to update my event system by implementing jQuery to detect when the Enter key is pressed on specific textboxes.

I appreciate the valuable input from those who helped shed light on my initial misconception. Thank you for your assistance!

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