Uncaught typeerror illegal invocation что за ошибка
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Uncaught typeerror illegal invocation что за ошибка

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«Uncaught TypeError: Illegal invocation» while overriding EventSource

Playground link: https://www.w3schools.com/html/tryit.asp?filename=tryhtml5_sse Problem: I am trying to override EventSource in such a way that there will be a console.log whenever onmessage triggers. Code:

   

Getting server updates

if (typeof EventSource !== "undefined") < const original = EventSource; // part of chrome extension window.EventSource = function EventSource(url) < const ori = new original(url); Object.getPrototypeOf(ori).onmessage = function (event) < console.log(event); // log on every message ori.onmessage(event); >; return ori; >; // actual source code var source = new EventSource("demo_sse.php"); source.onmessage = function (event) < document.getElementById("result").innerHTML += event.data + "
"; >; > else

But I am getting this error: Error:

VM461:10 Uncaught TypeError: Illegal invocation at new EventSource (:10:42) at :21:16 at submitTryit (tryit.asp?filename=tryhtml5_sse:853:17) at HTMLButtonElement.onclick (tryit.asp?filename=tryhtml5_sse:755:133) EventSource @ VM461:10 (anonymous) @ VM461:21 submitTryit @ tryit.asp?filename=tryhtml5_sse:853 onclick @ tryit.asp?filename=tryhtml5_sse:755 uic.js?v=1.0.5:1 Uncaught ReferenceError: adngin is not defined at uic_r_p (uic.js?v=1.0.5:1:54492) at HTMLButtonElement.onclick (tryit.asp?filename=tryhtml5_sse:755:148) uic_r_p @ uic.js?v=1.0.5:1 onclick @ tryit.asp?filename=tryhtml5_sse:755

Почему ругается: «Uncaught TypeError: Illegal invocation»?

Author24 — интернет-сервис помощи студентам

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Jquery выдает ошибки: Uncaught TypeError: Illegal invocation
Всем привет, возникла такая ошибка, вчера все работало нормально никаких изменений не вносил, а вот.

Решение ошибки ‘Illegal invocation’ в $.ajax в jQuery

Если в процессе AJAX-запроса используя jQuery возникает ошибка Uncaught TypeError: Illegal invocation , убедитесь, что параметр data принимает обычный объект, не связанный с DOM-элементом. Пример стандартных настроек AJAX-запроса будет выглядеть следующим образом:

Скопировать код

$.ajax(< url: 'your_url', type: 'POST', data: < key: 'value' >, // Используйте простые объекты для передачи данных success: function(response) <>, // Обработка полученного ответа error: function(error) <> // Обработка возникшей ошибки >);

Помните о важности использовать пары ключ-значение для data и корректности обращения к this , если это необходимо.

Разбираем ошибку

Ошибку «Illegal invocation» в функции $.ajax jQuery обычно вызывает неправильно отформатированные данные. jQuery умеет эффективно обрабатывать «ассоциативные массивы», которые оказываются легко обрабатываемыми на стороне сервера, например, в PHP. При попытке передать объект jQuery или DOM напрямую возникнет ошибка, т.к. в этом случае jQuery не сможет подготовить данные для передачи в виде корректного «ассоциативного массива».

How to Troubleshoot ‘Illegal Invocation’ Error in JavaScript

Why ‘Illegal Invocation’ May Be Occurring on Your Site

  • Using the wrong context: If you are calling a function or method with an incorrect context, such as passing a non-object value for the “this” keyword, it can cause the “Illegal invocation” error to occur.
  • Incorrectly using callbacks: If you are using a callback function incorrectly, such as calling it with an incorrect context or arguments, it can cause the “Illegal invocation” error to occur.
  • Misusing built-in methods: If you are misusing built-in JavaScript methods such as forEach(), map(), reduce(), etc., it can cause the “Illegal invocation” error to occur.
  • Using third-party libraries: If you are using third-party libraries or plugins, it’s possible that one of these may be causing the “Illegal invocation” error due to incorrect usage or a bug.
  • Issues with the code: If there are syntax or logical errors in your code that are causing unexpected behavior, it can trigger the “Illegal invocation” error.

To troubleshoot the “Illegal invocation” error on your eCommerce site, you should start by reviewing the code that triggers the error and verifying that the function or method is called with the correct context and arguments. You may also want to check any third-party libraries or plugins that you are using to ensure that they are being used correctly. Finally, you should review your code for any syntax or logical errors that may be causing the issue. Once you have identified the root cause of the error, you can take steps to fix it and ensure that your eCommerce site is running smoothly.

General Troubleshooting Steps for ‘Illegal Invocation’ Error in JavaScript

To solve the “Illegal invocation” in JavaScript, you need to identify the root cause of the error and fix it accordingly. Here are some general steps that you can take to resolve this error:

  1. Check the function’s context: Review the function or method that is triggering the error and verify that it is being called with the correct context. If the function is designed to be called as a method of an object, ensure that it is being called with the correct object as the “this” keyword.
  1. Verify the function’s arguments: Check the arguments being passed to the function or method that is triggering the error. Ensure that the arguments have the correct data type and that they are being passed in the correct order.
  1. Review your code for syntax and logical errors: If there are any syntax or logical errors in your code, it can cause unexpected behavior and trigger the “Illegal invocation” error. Review your code for any syntax or logical errors and fix them accordingly.
  1. Check third-party libraries or plugins: If you are using third-party libraries or plugins, it’s possible that one of these may be causing the “Illegal invocation” error due to incorrect usage or a bug. Check the documentation for the library or plugin to ensure that you are using it correctly.
  1. Use the call() or apply() method: If you are unable to fix the error by adjusting the context or arguments, you can try using the call() or apply() method to call the function with a specific context.
  1. Use bind() method: If you need to fix the context of a function, you can use the bind() method to create a new function with a specific context.

Overall, the solution to “Illegal invocation” depends on the specific cause of the error. By following these troubleshooting steps, you can identify and resolve the issue and ensure that your JavaScript code is running smoothly.

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