Imagine this scenario:
var q = document.querySelectorAll;
q('body');
Suddenly, an "Illegal invocation" error pops up in Chrome. It's puzzling why this happens, especially considering that not all native code functions behave this way. Take for example:
var o = Object; // a native code function
var x = new o();
Here, everything runs smoothly without any errors. This issue seems to mainly arise when working with the document and console objects. What are your thoughts on this matter?
One reason for this issue is the loss of the function's "context."
For example, when you make a call like:
document.querySelectorAll()
the context of the function is tied to document, and can be accessed as this within that method.
However, if you simply call q, there is no explicit context - it defaults to the global window object instead.
As a result, when querySelectorAll attempts to reference this, it encounters the Window object, not a DOM element. This mismatch causes errors in the interpretation process.
To address this problem, utilize the newer Javascript feature .bind:
var q = document.querySelectorAll.bind(document);
This approach ensures that subsequent calls to q maintain the correct context. If .bind is unavailable, an alternative solution involves creating a function like this:
function q() {
return document.querySelectorAll.apply(document, arguments);
}
Here's a simple way to achieve this:
const selectAll = document.querySelectorAll;
selectAll.apply(document, ['body']);
My experience involved encountering an Illegal invocation error, which was caused by passing an undeclared variable as an argument to a function. Remember to always declare variables before passing them to functions.
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