Exploring the distinctions between ajax, await, async, and

English is not my strong suit, so please bear with me if my writing seems odd.

We have discovered two methods for transitioning from asynchronous ajax calls to synchronous ones.

  1. Using async: false
  2. Utilizing await

Both achieve the same outcome, but I am curious about the distinctions between these two approaches.

function callAjax(url) {
    $.ajax({
        url: url,
        type: "POST",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        data: JSON.stringify(data),
        caches: false,
        async: false,
        success: function(response) {
            console.log(response);
        },
        failed: function(e) {
            ajaxFail(e);
        }
    });
}
async function ca(url) {


    await $.ajax({
        url: url,
        type: "POST",
        contentType: "application/json; charset=utf-8",
        caches: false,
        success: function(response) {
            console.log(response);
        },
        failed: function(e) {
            ajaxFail(e);
        }
    });
}

I am unsure how to effectively distinguish between the core aspects. I hope my English is clear enough. Apologies for any mistakes.

Answer №1

Two functions are used for AJAX POST requests, but they have key differences. The first function is synchronous (not recommended) and has a error callback name typo. The second function is asynchronous (recommended) and has the correct error callback name. There are several distinctions between these two functions.

  1. Dealing with Asynchronous Behavior
  • In the first function (callAjax), async: false is utilized. This makes the AJAX request synchronous, blocking script execution until the request finishes. Synchronous requests are discouraged in modern web development due to potential poor user experience and browser unresponsiveness during the request.
  • In the second function (ca), the async option is not explicitly set, so it defaults to true, making the AJAX request asynchronous without blocking script execution. Best practices now recommend using asynchronous requests to avoid main thread blocking.
  1. Handling Data:
  • Both functions use POST requests with contentType set as JSON and send JSON data in the request body using JSON.stringify(data).
  1. Managing Success and Failure:
  • Both functions have success and failure callback functions. However, the names of the callback functions differ. In the first function, the success callback is named success and the failure callback is named failed. In the second function, both callbacks are named success and failed respectively.
  1. Error in the First Function:
  • The first function contains a typo: failed should be error in the options object. The correct event name for handling errors in jQuery AJAX is error, not failed. The revised version is as follows:
failed: function(e) {
    ajaxFail(e);
}

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