The error message "BookList is not a constructor" indicates a Type Error

Within my Django app template, I have some JavaScript code:

bookList = new BookList();
bookList.init();
updateBookUrlList();

However, an error is occurring with the message:

Uncaught TypeError: BookList is not a constructor

The above code is located in an external file named book-list.js:

var BookList=function(){};
BookList.prototype.init=function(){this.$eventslist=$(".event-list"),...

I am struggling to identify what could be causing this issue in my code.

UPDATE:

After modifying my code to:

function BookList() {};

I encountered a new error:

TypeError: bookList.init is not a function

Answer №1

Simply modify your function declaration like so:

let MyList = function() {

Instead of:

function MyList() {

By using the first method, you restrict access to the function until after its declaration. However, by opting for the second method, the function can be accessed from any part of your code, even before it is declared.

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