Let’s start with defining a block of code inside of the onClick handler itself: As the example above shows, it is possible to define a block of code inside of the onClick handler. Take a look at the example below. In this tutorial, I will show you how to programmatically set the focus to an input element using React.js and hooks. Whenever you need to perform an action after clicking a button, link, or pretty much any element, you’ll use the onClick event handler. This article clarifies most of the doubts. Get the monthly newsletter, packed full of our latest React tutorials, delivered straight to your inbox. Your email address will not be published. Set focus on button click. The button inside the React component has an onClick event handler attached to it, pointing to our sayHello() function. Opt out at any time. For example, updating a component’s state and simultaneously showing an alert. Thank you for your complete and brief tutorial, it could be better if you explain rendering a component inside of onClick event. This is also very common when using input elements and the onChange event handler. However, there may be instances when you need to do the above. Calling .focus() method on the current property will set the focus on our input element. The simple App component above has one function called sayHello(), and a single button. Notice the value e that’s returned from the onClick event handler: The value e is what’s called a SyntheticEvent. A very common use of an inline function inside of an onClick event handler in React is to update a component’s state.

Let’s take a look at an example: A common mistake when using inline functions is not including parentheses after the function name.

There is an extra parentheses at the end of this line of code: this.setState({ count: 1}))}>. We will use two hooks, useRef and useEffect. Take some time to explore the SyntheticEvent further as there are more useful values inside of it. React Refs. All you need is a functional component.

Finally, it passes in the name from the array as an argument of the deleteUserWithName function. Following example shows a component that will focus to the text input when rendered.

You’ll do this when you want to update the state with the button’s value, or using a value from a loop, for example. An inline function is a function which is defined inside of the onClick handler when the React Component renders. One common use of arrays in React is to render multiple components per item in the array. Refs can then be assigned to an element with ref-attribute. Set up the Project. Upmostly brings you original React and JavaScript tutorials each week. onClick is the cornerstone of any React app. Therefore, the onClick event handler is one of the most powerful and most used tools in your React tool belt.

In React, the onClick handler allows you to call a function and perform an action when an element is clicked. Click on any of the examples below to see code snippets and common uses: Call a Function After Clicking a Button; Call an Inline Function in an onClick Event Handler Don't miss the latest React tutorials. You may find yourself wanting to call multiple functions after clicking a button. I have created a React app from scratch using create-react-app. The e.target.value is originating from the value attribute that’s on the actual button element. The final example we’ll explore is how to pass in a value from an array to an inline function that’s inside of the onClick event handler.

Thank you for mentioning both the paradigms class based one and functional with hooks one! Jacob “the eagle-eyed developer”, well spotted! For example, an admin dashboard which displays a list of users and provides admins with the ability to edit or delete users: The code above first defines a new array called users with a list of first names. Upmostly React Discord Server is now open! And now you know how to set focus on input after render in React … Call an Inline Function in an onClick Event Handler, Call Multiple Functions in an onClick Event Handler, Update the State inside an onClick Event Handler, Pass a Button Value to an Inline Function, Pass a Value from an Array to an Inline Function, Simplifying React State and the useState Hook, How React Reignited My Love for Web Development, How to Use the setState Callback in React, How to Check if Object is Empty in JavaScript, React Filter: Filtering Arrays in React (With Examples), Running a block of code inside the onClick handler, Calling multiple functions inside the onClick handler. Let’s take a look at how we can update the state inside of an onClick event handler: Continue learning about updating state in React components through the onClick event handler in Simplifying React State and the useState Hook. Refs are created with React.createRef() function. Your email address will not be published. onClick is the cornerstone of any React app. Click on any of the examples below to see code snippets and common uses: If you’re new to React, I suggest you read our excellent beginner tutorial: Build a Todo App in React Using Hooks. In React, the onClick handler allows you to call a function and perform an action when an element is clicked. Then replace everything inside the App component with this:

Refs can be used to access DOM nodes or React components that are rendered in the render method. Required fields are marked *, Good one.

Every event handler is passed a SyntheticEvent, which is an object that contains useful metadata related to the event, such as the target element’s value. Similarly, calling multiple functions inside of the onClick handler is also possible: Again, the code above is not as readable as it could be if we just called the sayHello function and set the state inside of that. It’s created on render because the function definition is inside of the onClick handler, which is inside of the component render method (or return, in the case of functional React components). Parentheses after a function name executes the function. By passing in the name of the function you want to call inside the curly braces, after the event handler: Notice how we only pass the name of the function to the event handler and not the name followed by parentheses.
However, depending on the amount of code that you want to run, the block scope can be difficult to read.

Let’s look at some examples of how we can use the onClick event handler in React.

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