$.getScript mutiple scripts

This enhanced $.getScript method efficiently loads multiple JavaScript files and executes a callback function only after all scripts have successfully loaded. This avoids the complexities of nested callbacks ("callback hell") often encountered when loading multiple scripts sequentially.

The original single-script $.getScript function is shown below for comparison:

$.getScript('script1.js', function(data, textStatus) {
    // Code to execute after script1.js loads
});

The improved version handles an array of script URLs:

/* Enhanced $.getScript to handle multiple scripts */
var getScript = jQuery.getScript;
jQuery.getScript = function(resources, callback) {
    let length = resources.length,
        handler = function() { counter++; },
        deferreds = [],
        counter = 0,
        idx = 0;

    for (; idx < length; idx++) {
        deferreds.push(getScript(resources[idx], handler));
    }

    jQuery.when.apply(null, deferreds).then(function() {
        callback && callback();
    });
};

// Example usage:
$.getScript(['script1.js', 'script2.js', 'script3.js'], function() {
    // Code to execute after all scripts load
});

// Alternative using a separate array:
var scripts = ['script1.js', 'script2.js', 'script3.js'];
$.getScript(scripts, function(data, textStatus) {
    // Code to execute after all scripts load
});

An alternative approach, useful when one script requires a callback, is demonstrated here:

$.get("js/ext/flowplayer-3.2.8.min.js")
  .pipe($.get("js/eviflowplayer.js"))
  .pipe($.get("js/evi.flowplayer.js", {}, function() {
      W.EVI.FLOWPLAYER.init(elem.attr('id'));
  }));

Frequently Asked Questions (FAQs):

This section addresses common questions about $.getScript and loading multiple scripts. The original FAQ section has been reorganized and rewritten for clarity and conciseness.

• What is $.getScript? $.getScript is a jQuery function that loads and executes a JavaScript file asynchronously via an HTTP GET request. It's a simplified version of $.ajax().

• How to load multiple scripts? The enhanced code above provides a robust solution. Chaining $.get (as in the alternative example) is suitable for situations with a specific callback requirement for a single script.

• Benefits of $.getScript? Improves page load performance by loading scripts on demand, enhances code organization, and promotes code reusability.

• Error Handling? While not explicitly shown in the provided code, error handling can be implemented using $.ajax().fail().

• Cross-Origin Resource Sharing (CORS)? $.getScript supports CORS, but success depends on the server's CORS configuration.

• Synchronous Loading? $.getScript is inherently asynchronous. For synchronous loading, use $.ajax({ async: false }), but be aware of potential performance implications.

• Loading Non-JavaScript Files? $.getScript is specifically for JavaScript files.

• Scripts with Dependencies? The order of execution isn't guaranteed with asynchronous loading. The provided solution ensures all scripts load before the callback executes, addressing dependency issues.

• Loading Scripts in a Loop? While possible, the asynchronous nature requires careful consideration of execution order. The enhanced $.getScript handles this efficiently.

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