Category: JavaScript

Categories
React Answers

How to add TypeScript interface signature for the onClick event in React?

Labrador retriever puppy walking on green grass

Sometimes, we want to add TypeScript interface signature for the onClick event in React.

In this article, we’ll look at how to add TypeScript interface signature for the onClick event in React.

How to add TypeScript interface signature for the onClick event in React?

To add TypeScript interface signature for the onClick event in React, we use the React.MouseEventHandler<HTMLButtonElement> type.

For instance, we write

interface IPropsSquare {
  message: string;
  onClick: React.MouseEventHandler<HTMLButtonElement>;
}

to define the IPropsSquare interface.

In it, we add the onClick property and set it to the React.MouseEventHandler<HTMLButtonElement> type.

Then we can set the onClick prop to a function that’s used as the click event handler for the button without type errors.

Conclusion

To add TypeScript interface signature for the onClick event in React, we use the React.MouseEventHandler<HTMLButtonElement> type.

Categories
JavaScript Answers

How to submit form using an a tag with JavaScript?

Labrador retriever puppy walking on green grass

To submit form using an a tag with JavaScript, we can call the form’s submit method.

For instance, we write

<form name="myForm" action="handle-data.php">
  Search: <input type="text" name="query" />
  <a href="javascript: submitform()">Search</a>
</form>

to add a form.

Then we write

function submitform() {
  document.myForm.submit();
}

to define the submitForm function which we set as the value of the href attribute of the a element.

In it, we get the by its name with document.myForm.

And then we call submit to submit the form.

Conclusion

To submit form using an a tag with JavaScript, we can call the form’s submit method.

Categories
JavaScript Answers

How to add meta tag in JavaScript?

Labrador retriever puppy walking on green grass

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.

Categories
React Answers

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

Labrador retriever puppy walking on green grass

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.

Categories
JavaScript Answers

How to search inside a JSON object with JavaScript?

Labrador retriever puppy walking on green grass

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.