It is not possible to utilize a JavaScript function once the script has been loaded through

Question

It is not possible to utilize a JavaScript function once the script has been loaded through

I am attempting to programmatically load a local JavaScript file - PapaParse library, and then utilize one of its functions:

$.getScript("./Content/Scripts/papaparse.js", function () {
    console.log("Papaparse loaded successfully");
    Papa.parse(file, { skipEmptyLines: true, header: false, complete: completeCallback });
});

The script loads successfully, but when I try to call the parse method, it throws an error:

ReferenceError: Papa is not defined

Within the PapaParse library, Papa is defined like this:

(function (global) {
    "use strict";

    var Papa = {};
    Papa.parse = someFunction;
    .
    .
    global.Papa = Papa;
}

If it helps, this entire code is called from a TypeScript file.
What could be the issue here?

javascript jquery typescript papaparse

Answer 1

Answer №1

In a previous answer, Castro highlighted the information provided in the official documentation of Jquery's getScript. According to this documentation, the callback of the getScript method is triggered once the script has been loaded but not necessarily executed.

This means that when the callback function of getScript is invoked, the target script is only being loaded in the current page context and not fully executed. Therefore, it is important to give the JavaScript engine time to execute the script. One way to achieve this is by using setTimeout/setInterval.

To incorporate this concept into your code, you can include setTimeout/setInterval within the callback function of getScript. Here is an example of how you can modify your code:

$.getScript("./Content/Scripts/papaparse.js", function () {
    console.log("Papaparse loaded successfully");
    function dealWithPapa() {
       Papa.parse(file, { skipEmptyLines: true, header: false, complete: completeCallback });
    }
    // Check every 100ms if Papa is loaded
    var interval = setInterval(function() {
        if(Papa !== undefined) {
            clearInterval(interval); // Clear the interval once Papa is loaded
            dealWithPapa();
        }       
    },100);

});

I hope this explanation helps clarify any confusion you may have had.

Answer 2

In a previous answer, Castro highlighted the information provided in the official documentation of Jquery's getScript. According to this documentation, the callback of the getScript method is triggered once the script has been loaded but not necessarily executed.

This means that when the callback function of getScript is invoked, the target script is only being loaded in the current page context and not fully executed. Therefore, it is important to give the JavaScript engine time to execute the script. One way to achieve this is by using setTimeout/setInterval.

To incorporate this concept into your code, you can include setTimeout/setInterval within the callback function of getScript. Here is an example of how you can modify your code:

$.getScript("./Content/Scripts/papaparse.js", function () {
    console.log("Papaparse loaded successfully");
    function dealWithPapa() {
       Papa.parse(file, { skipEmptyLines: true, header: false, complete: completeCallback });
    }
    // Check every 100ms if Papa is loaded
    var interval = setInterval(function() {
        if(Papa !== undefined) {
            clearInterval(interval); // Clear the interval once Papa is loaded
            dealWithPapa();
        }       
    },100);

});

I hope this explanation helps clarify any confusion you may have had.

Answer 3

Answer №2

As stated on https://api.jquery.com/jquery.getscript/:

The callback function is triggered after the script has finished loading, but it may not have executed yet.

In some cases, you may consider using a setTimeout(300, function(){...}) to ensure that it gets executed properly.

Answer 4

As stated on https://api.jquery.com/jquery.getscript/:

The callback function is triggered after the script has finished loading, but it may not have executed yet.

In some cases, you may consider using a setTimeout(300, function(){...}) to ensure that it gets executed properly.

It is not possible to utilize a JavaScript function once the script has been loaded through

Answer №1

Answer №2

Similar questions

Font icon not appearing when toggling the class "before"

Combining a local URL with an absolute URL through jQuery AJAX

How to pass parameters between pages in Ionic 2 using navParams when the return nav button is clicked

Navigate to a fresh webpage and find the scrollbar sitting at the bottom

ERROR: Running out of memory in JavaScript heap while executing a command with "npm"

Tips for displaying a loader image with a centered message and preventing the bootstrap modal dialogue box from closing during an AJAX response from a PHP file

Error: Angular SSR does not recognize IDBIndex

Execute ReactJS function only if query parameters are configured

Tips on updating content at a specific time without the need to refresh the page

unable to employ angular ui-sortable

Building Dynamic Columns within a react.js Environment

How to resolve: Preventing Ajax - Post request from executing repetitively

Assigning objects in Vue.js methods

Use JavaScript to gather various data forms and convert them into JSON format before transmitting them to PHP through AJAX

Issue: Unable to locate module - Unable to resolve 'core-js/modules/es.error.cause.js'

What is the method to retrieve text from a div element with Webdriver-IO?

Exploring discrepancies between two tables with the power of Javascript

Tips for ensuring an element is visible in CUCUMBER JS?

Enhancing dynamically generated elements with CSS styling

What is the best way to call upon a necessary module from various files?