Category: JavaScript

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JavaScript Answers

How to Fix the ‘InternalError: too much recursion’ Error in Our JavaScript App?

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Sometimes, we may run into the ‘InternalError: too much recursion’ when we’re developing JavaScript apps.

In this article, we’ll look at how to fix the ‘InternalError: too much recursion’ when we’re developing JavaScript apps.

Fix the ‘InternalError: too much recursion’ When Developing JavaScript Apps

To fix the ‘InternalError: too much recursion’ when we’re developing JavaScript app, we should make sure that our recursion has a base case that’s executed.

And when that’s executed, the recursion code stops running.

The ‘InternalError: too much recursion’ error is fired by Firefox when it tries to run infinite recursion code.

In Edge, the Error: Out of stack space error is fired.

And in Chrome, the RangeError: Maximum call stack size exceeded is fired for the same error.

Example, of infinitely recursive code is something like:

const count = (x) => {
  count(x + 1);
}
count (0);

There’s no base case in this code, so count keeps running forever once it’s called.

The error can also be fired when there’s too much recursion in the code.

For instance, if we have:

const count = (x) => {
  if (x >= 1000000000000) {
    return;
  }
  count(x + 1);
};
count(0);

Then count stops running only when x is 1000000000001.

This is too much for the browser to handle, so the browser will fire the error.

Also, we should make sure we don’t have setters that sets the same value as it’s getting.

For instance, if we have:

class Person {
  constructor() {}
  set name(name) {
    this.name = name;
  }
}

Then we also have this error because we’re setting and getting the name property in the name setter.

Conclusion

To fix the ‘InternalError: too much recursion’ when we’re developing JavaScript app, we should make sure that our recursion has a base case that’s executed.

Categories
JavaScript Answers

How to Fix the ‘Error: Permission denied to access property “x” ‘ Error in Our JavaScript App?

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Sometimes, we may run into the ‘Error: Permission denied to access property "x"’ when we’re developing JavaScript apps.

In this article, we’ll look at how to fix the ‘Error: Permission denied to access property "x"’ when we’re developing JavaScript apps.

Fix the ‘Error: Permission denied to access property "x"’ When Developing JavaScript Apps

To fix the ‘Error: Permission denied to access property "x"’ when we’re developing JavaScript apps, we should make sure we don’t try to access an object which we have no permission to access.

For instance, if we try to access an iframe’s document object as follows:

<!DOCTYPE html>
<html>
  <head>
    <iframe id="myframe" src="http://example.com"></iframe>
    <script>
      onload = function() {
        console.log(frames[0].document);
      }
    </script>
  </head>
  <body></body>
</html>

Then we may get this error since we have no permission to access an iframe’s document object in out JavaScript app.

The same-origin policy prevents us from accessing the iframe’s document object to prevent unauthorized access of an external document.

Conclusion

To fix the ‘Error: Permission denied to access property "x"’ when we’re developing JavaScript apps, we should make sure we don’t try to access an object which we have no permission to access.

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React Answers

How to Fix the “Invalid ARIA Prop Warning” When Developing React Apps?

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Sometimes, we may run into the "Invalid ARIA Prop Warning" when we’re developing React apps.

In this article, we’ll look at how to fix the "Invalid ARIA Prop Warning" when we’re developing React apps.

Fix the "Invalid ARIA Prop Warning" When Developing React Apps

To fix the "Invalid ARIA Prop Warning" when we’re developing React apps, we should make sure that the aria-* prop that we add to an element is a valid aria-* prop.

We should check the spelling of the attribute carefully.

Some attributes like aria-labelledby and aria-activedescendant are often misspelled.

Also, newer aria-* attributes may not be recognized by React yet. They’ll be recognized in later versions.

React strips out all unknown attributes when components are rendered, so aria-* attributes not recognized by React will not be rendered.

Conclusion

To fix the "Invalid ARIA Prop Warning" when we’re developing React apps, we should make sure that the aria-* prop that we add to an element is a valid aria-* prop.

We should check the spelling of the attribute carefully.

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React Answers

How to Fix the “Refs Must Have Owner Warning ” When Developing React Apps?

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Sometimes, we may run into the "Refs Must Have Owner Warning" when we’re developing React apps.

In this article, we’ll look at how to fix the "Refs Must Have Owner Warning" when we’re developing React apps.

Fix the "Refs Must Have Owner Warning" When Developing React Apps

To fix the "Refs Must Have Owner Warning" when we’re developing React apps, we should make sure that we aren’t trying to add a ref to a function component.

Also, we shouldn’t also add a ref to an element that’s created outside of a component’s render function.

And we should make sure that eliminate multiple conflicting copies of React.

For instance, if Bar is a function component, we should write anything like:

<Bar ref={foo} />

Also, we should have string refs outside the render method of a class component:

ReactDOM.render(<App ref="app" />, el);

Instead, we write:

let app;
ReactDOM.render(
  <App ref={inst => {
    app = inst;
  }} />,
  el
);

to assign a ref to the component with a function ref.

We can use npm ls react to check if we have multiple copies of React loaded.

Conclusion

To fix the "Refs Must Have Owner Warning" when we’re developing React apps, we should make sure that we aren’t trying to add a ref to a function component.

Also, we shouldn’t also add a ref to an element that’s created outside of a component’s render function.

And we should make sure that eliminate multiple conflicting copies of React.

Categories
React Answers

How to Fix the “React Element Factories and JSX Warning” When Developing React Apps?

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Sometimes, we may run into the "React Element Factories and JSX Warning" when we’re developing React apps.

In this article, we’ll look at how to fix the "React Element Factories and JSX Warning" when we’re developing React apps.

Fix the "React Element Factories and JSX Warning" When Developing React Apps

To fix the "React Element Factories and JSX Warning" when we’re developing React apps, we shouldn’t call function components directly.

For instance, don’t write anything like:

import MyComponent from 'MyComponent';

function render() {
  return MyComponent({ foo: 'bar' });
}

If we call MyComponent as a regular function, we’ll get the "React Element Factories and JSX Warning".

Instead, we should use the JSX syntax to render the component.

To do that, we write something like:

import MyComponent from 'MyComponent';

function render() {
  return <MyComponent foo="bar" />;
}

We can call the React.createFactory method to convert the function component into a function we can call.

To use it, we write:

import React from 'react';
import MyComponent from "MyComponent";
const MyComp = React.createFactory(MyComponent);

function render() {
  return MyComp({ foo: "bar" });
}

Also, we can create dynamic components by using the React.createElement with the function to render it:

import React from 'react';
import MyComponent from "MyComponent";

function render(MyComponent) {
  return React.createElement(MyComponent, { foo: 'bar' });
}

Conclusion

To fix the "React Element Factories and JSX Warning" when we’re developing React apps, we shouldn’t call function components directly.

We can call the React.createFactory method to convert the function component into a function we can call.