Tips for avoiding redundant AJAX requests

Question

Tips for avoiding redundant AJAX requests

Currently, I am working with JavaScript and not jQuery.

Imagine a scenario where I have 3 users in my database [Kim, Ted, Box] and 3 buttons structured as follows:

<button class="user">Kim</button>
<button class="user">Ted</button>
<button class="user">Box</button>
<div id="displayArea"></div>

Whenever a user clicks on any of the buttons, it should display the respective user information within the div element.

For instance, if I click on the Kim button, an ajax call retrieves and displays Kim's information. Then, upon clicking Ted, another ajax call fetches Ted's data. However, if I click on Kim again afterward, I want to avoid making a new ajax call and instead retrieve the data from cache or another source if it was already loaded previously. How can this functionality be implemented?

The reason behind this requirement is to enhance user experience by eliminating unnecessary loading times for data that has been fetched before.

javascript ajax

Answer 1

Answer №1

To enhance the efficiency of data retrieval, introduce a new layer of abstraction by developing a function that manages caching and is responsible for either fetching the data from cache or executing an Ajax request to obtain it. Here's an example:

var getDataForUser = (function() {
    /**
     * An object is utilized as a cache with user names serving as keys.
     * This variable remains inaccessible outside this function
     */
    var cache = {}; 

    /**
     * The core function for data retrieval
     */
    return function getDataForUser(user, callback) {
        if (cache.hasOwnProperty(user)) { // handling cache hits
            callback(cache[user]);
        } else {
            // construct the URL incorporating the user name
            var url = ...;
            makeAjaxRequest(url, function(data) { // addressing cache misses
                cache[user] = data; // store in cache
                callback(data);
            });
        }
     };
}());

Subsequently, initiate the call

getDataForUser('John', function(data) { /*...*/ });

twice which will result in accessing the cached data upon repeating the process.

Answer 2

To enhance the efficiency of data retrieval, introduce a new layer of abstraction by developing a function that manages caching and is responsible for either fetching the data from cache or executing an Ajax request to obtain it. Here's an example:

var getDataForUser = (function() {
    /**
     * An object is utilized as a cache with user names serving as keys.
     * This variable remains inaccessible outside this function
     */
    var cache = {}; 

    /**
     * The core function for data retrieval
     */
    return function getDataForUser(user, callback) {
        if (cache.hasOwnProperty(user)) { // handling cache hits
            callback(cache[user]);
        } else {
            // construct the URL incorporating the user name
            var url = ...;
            makeAjaxRequest(url, function(data) { // addressing cache misses
                cache[user] = data; // store in cache
                callback(data);
            });
        }
     };
}());

Subsequently, initiate the call

getDataForUser('John', function(data) { /*...*/ });

twice which will result in accessing the cached data upon repeating the process.

Tips for avoiding redundant AJAX requests

Answer №1

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