Dynamically Load Js Inside Js Duplicate

Have you ever come across a situation where you needed to dynamically load JavaScript inside JavaScript, especially in cases where you might unintentionally end up loading the same script multiple times? Don't worry, it's a common scenario that can be handled efficiently. In this article, we'll discuss how you can dynamically load JS inside JS without duplicates.

When it comes to dynamically loading JavaScript files within your code, it's essential to consider how you manage those requests to prevent duplicates and ensure efficient execution. One approach to achieve this is by leveraging the power of JavaScript to check whether a script has already been loaded before initiating a new request.

To begin, you can create a function that checks if a specific JavaScript file has already been added to the DOM. This function can be designed to take the script URL as a parameter and iterate through the existing script tags to compare their sources with the provided URL.

function isScriptAlreadyIncluded(url) {
    const scripts = document.getElementsByTagName('script');
    for (let i = 0; i < scripts.length; i++) {
        if (scripts[i].getAttribute('src') === url) {
            return true;
        }
    }
    return false;
}

In the above function, we loop through all the script tags in the document and compare their 'src' attribute with the URL of the script we intend to load. If a match is found, the function returns `true`, indicating that the script is already present.

Next, let's create a function that can dynamically load a JavaScript file only if it hasn't been included before. This function will use the `isScriptAlreadyIncluded()` function we defined earlier to check for duplicates.

function loadScript(url) {
    if (!isScriptAlreadyIncluded(url)) {
        const script = document.createElement('script');
        script.src = url;
        document.head.appendChild(script);
    }
}

By utilizing the `loadScript()` function in your code, you can ensure that duplicate scripts are not loaded, thus improving the efficiency of your application and preventing unnecessary network requests.

In practice, suppose you have a scenario where you need to dynamically load 'script1.js' and 'script2.js' inside your JavaScript code. You can use the `loadScript()` function as follows:

loadScript('script1.js');
loadScript('script2.js');

This code snippet will intelligently load only the scripts that have not been previously included, effectively managing script dependencies and avoiding duplicates.

In conclusion, dynamically loading JavaScript inside JavaScript can be made more robust and efficient by implementing a simple check for duplicate scripts. By incorporating the functions discussed in this article into your workflow, you can streamline the loading process and maintain a clean, optimized script handling mechanism.