Author: John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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JavaScript Answers

How to add meta tag in JavaScript?

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Sometimes, we want to add meta tag in JavaScript.

In this article, we’ll look at how to add meta tag in JavaScript.

How to add meta tag in JavaScript?

To add meta tag in JavaScript, we call createElement.

For instance, we write

const meta = document.createElement("meta");
meta.httpEquiv = "X-UA-Compatible";
meta.content = "IE=edge";
document.head.appendChild(meta);

to call createElement to create a meta element.

Then we set the http-equiv attribute with

meta.httpEquiv = "X-UA-Compatible";

We set the content attribute with

meta.content = "IE=edge";

And we append it as the last child of the head element with

document.head.appendChild(meta);

Conclusion

To add meta tag in JavaScript, we call createElement.

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React Answers

How to fix Expected onClick listener to be a function, instead got type string error with React?

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Sometimes, we want to fix Expected onClick listener to be a function, instead got type string error with React.

In this article, we’ll look at how to fix Expected onClick listener to be a function, instead got type string error with React.

How to fix Expected onClick listener to be a function, instead got type string error with React?

To fix Expected onClick listener to be a function, instead got type string error with React, we should make sure we set the onClick prop to a function reference.

For instance, we write

const activateLasers = () => {
  //...
};

<button onClick={activateLasers}>Activate Lasers</button>;

to set the onClick prop to the activateLasers function.

We don’t call the function.

We just set the function reference as the onClick prop’s value.

Conclusion

To fix Expected onClick listener to be a function, instead got type string error with React, we should make sure we set the onClick prop to a function reference.

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JavaScript Answers

How to search inside a JSON object with JavaScript?

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Sometimes, we want to search inside a JSON object with JavaScript.

In this article, we’ll look at how to search inside a JSON object with JavaScript.

How to search inside a JSON object with JavaScript?

To search inside a JSON object with JavaScript, we use the array find method.

For instance, we write

const data = {
  list: [
    { name: "My Name", id: 1, type: "car owner" },
    { name: "My Name 2", id: 2, type: "car owner 2" },
    { name: "My Name 3", id: 3, type: "car owner 3" },
    { name: "My Name 4", id: 4, type: "car owner 4" },
  ],
};

const result = data.list.find((record) => record.name === "My Name");

to get the data.list array property.

Then we use the find method to get the first result that has the name property equals 'My Name'.

Conclusion

To search inside a JSON object with JavaScript, we use the array find method.

Categories
React Answers

How to display images in React using JSX without import?

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Sometimes, we want to display images in React using JSX without import.

In this article, we’ll look at how to display images in React using JSX without import.

How to display images in React using JSX without import?

To display images in React using JSX without import, we use require.

For instance, we write

const imageName = require("./images/image1.jpg");

//...

const Comp = () => {
  //...
  return <img src={imageName} />;
};

to call require with the image path to import the image path.

Then we can use that as the value of the src property to load the image.

Conclusion

To display images in React using JSX without import, we use require.

Categories
JavaScript Answers

How to find the parent element using JavaScript?

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Sometimes, we want to find the parent element using JavaScript.

In this article, we’ll look at how to find the parent element using JavaScript.

How to find the parent element using JavaScript?

To find the parent element using JavaScript, we use the parentNode property.

For instance, we write

const parent = element.parentNode;

to use the parentNode to get the element‘s parent element.

Conclusion

To find the parent element using JavaScript, we use the parentNode property.