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I want to display that dropdown and make that option a default value which was selected by that user last time. I am using selected attribute on option but React generates a warning asking me to use default value on select. Problem is that I don't know the selectedOptionId as the selected option could be any option.

How would I find the defaultValue? React uses value instead of selected for consistency across the form components. You can use defaultValue to set an initial value. If you're controlling the valueyou should set value as well. If not, do not set value and instead handle the onChange event to react to user action.

Note that value and defaultValue should match the value of the option. In an instance where you want to set a placeholder and not have a default value be selected, you can use this option. In this case unfortunately you will have to use both defaultValue and value violating React a bit.

This is because react by semantics does not allow setting a disabled value as active. That way, the initial value you set the default and when the dropdown changes you need to change your state. Thank you all for this thread!

React Dropdown Select Tutorial with React-select

In other React forms I've built, the default value for a Select was preset in an associated Context. But in my latest React form a small modalI'm passing the values for the form as props and then using a useEffect to populate the associated Context.

react select default value

The solution was ultimately simple: Use the value property instead. Learn more. Asked 2 years, 9 months ago.

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Active 3 months ago. Viewed 52k times. For e. Piyush Piyush 2 2 gold badges 10 10 silver badges 16 16 bronze badges.

React/ReactJS: Dynamic Select/Option

Active Oldest Votes. I used "value" attribute on select instead of defaultValue and as you said I kept the value of "value" attribute for option and select same. Thus, it worked.! EDIT If this is a controlled component In this case unfortunately you will have to use both defaultValue and value violating React a bit.

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Dehan de Croos Dehan de Croos 2, 17 17 silver badges 26 26 bronze badges. Consider using an empty string instead "". Sammy I.In most cases, we recommend using controlled components to implement forms. In a controlled component, form data is handled by a React component. The alternative is uncontrolled components, where form data is handled by the DOM itself. To write an uncontrolled component, instead of writing an event handler for every state update, you can use a ref to get form values from the DOM.

Try it on CodePen. Since an uncontrolled component keeps the source of truth in the DOM, it is sometimes easier to integrate React and non-React code when using uncontrolled components. It can also be slightly less code if you want to be quick and dirty. Otherwise, you should usually use controlled components.

In the React rendering lifecycle, the value attribute on form elements will override the value in the DOM. With an uncontrolled component, you often want React to specify the initial value, but leave subsequent updates uncontrolled.

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To handle this case, you can specify a defaultValue attribute instead of value. You should use the File API to interact with the files. The following example shows how to create a ref to the DOM node to access file s in a submit handler:. For example, this code accepts a single name in an uncontrolled component: class NameForm extends React. Edit this page. Main Concepts. Advanced Guides.

API Reference. Concurrent Mode Experimental.HTML form elements work a little bit differently from other DOM elements in React, because form elements naturally keep some internal state.

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For example, this form in plain HTML accepts a single name:. This form has the default HTML form behavior of browsing to a new page when the user submits the form. If you want this behavior in React, it just works.

In React, mutable state is typically kept in the state property of components, and only updated with setState. Then the React component that renders a form also controls what happens in that form on subsequent user input. For example, if we want to make the previous example log the name when it is submitted, we can write the form as a controlled component:.

Try it on CodePen.

How to Create a Simple React Dropdown - Part 1

Since the value attribute is set on our form element, the displayed value will always be this. Since handleChange runs on every keystroke to update the React state, the displayed value will update as the user types. While this means you have to type a bit more code, you can now pass the value to other UI elements too, or reset it from other event handlers. Notice that this.

For example, this HTML creates a drop-down list of flavors:. Note that the Coconut option is initially selected, because of the selected attribute. React, instead of using this selected attribute, uses a value attribute on the root select tag. This is more convenient in a controlled component because you only need to update it in one place.

react select default value

For example:. You can pass an array into the value attribute, allowing you to select multiple options in a select tag:. Because its value is read-only, it is an uncontrolled component in React.

It is discussed together with other uncontrolled components later in the documentation. When you need to handle multiple controlled input elements, you can add a name attribute to each element and let the handler function choose what to do based on the value of event. Note how we used the ES6 computed property name syntax to update the state key corresponding to the given input name:.

Also, since setState automatically merges a partial state into the current statewe only needed to call it with the changed parts.

React/ReactJS: Difference between defaultValue and value

Specifying the value prop on a controlled component prevents the user from changing the input unless you desire so. The following code demonstrates this. The input is locked at first but becomes editable after a short delay. It can sometimes be tedious to use controlled components, because you need to write an event handler for every way your data can change and pipe all of the input state through a React component.

This can become particularly annoying when you are converting a preexisting codebase to React, or integrating a React application with a non-React library. In these situations, you might want to check out uncontrolled componentsan alternative technique for implementing input forms.

Edit this page.Forms are integral part of almost every web application; even the simplest of business websites has a contact form. In React, forms can be implemented in two ways and here is where beginners often stumble upon the common mistake of assigning a value without a handler or using both defaultValue and value together on form elements, which leads to logging warning messages as such in the console:. Warning: [YourComponent] contains an input of type text with both value and defaultValue props.

Input elements must be either controlled or uncontrolled specify either the value prop, or the defaultValue prop, but not both. Decide between using a controlled or uncontrolled input element and remove one of these props. In this tutorial, we will rectify such error-prone approaches and learn how to implement forms properly thereby exploring the concepts of controlled and uncontrolled components in React. But before we begin, here is the concise summary of the entire lesson:.

react select default value

In React, defaultValue is used with uncontrolled form components whereas value is used with controlled form components. They should not be used together in a form element. There is no explicit use of state variables and no implementation of any event handler whatsoever to update the input values.

Their values are just what we type in. This ref is created inside the constructor via the React.

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So, the value which the user enters can be had with current. We input some value which is fetched with this. This is also the same value which document. Suppose we decide to give it an intial value of something, say, example example. This will render a read-only field.

The other thing you will notice is that you are unable to type in or enter anything into the input box; whatever you are typing in is not showing or reflecting — the initially assigned value example example. This is because, in the lifecycle of React's rendering, the value attributes in the form elements overrides the values in the DOM. To handle such cases, React came up with the defaultValue attribute, which specifies the initial value but leave the ensuing updates uncontrolled.

Here is the correct way. In controlled componentswe assign a state variable to the value along with a handler to update the assigned state variable. Below is an example.

The value attribute is assigned the this. Remember again, defaultValue and value are never used together in a form element.June 20, 7 min read Building select elements used to be one of the easiest things to build when working on a web project three or four years ago. One has to consider features such as on-focusstyling select elements, fetching data from a remote source and the list goes on. You may have had this thought when working on that React project and wished a reusable component existed somewhere in the multiverse.

Well, lucky for us, Jed Watson started an open source project, funded by Thinkmill his company and Atlassiancalled react-select. There were several limitations with version one of react-select, which gave birth to v2. In the App. Component class. Our react-select component follows the same convention but the options and values are passed in as props.

In the code snippet above, we have our select options as music genres which is passed into the select component as props. When we run this application we should see a select element that spans across the screen from one end to the other. If you got that output when you ran your react application, kudos. There are two component properties option and control we tweaked to extend and customize the look and feel of the select component.

There are many properties provided by react-select which gives us, the consumers, a lot of room to build to our needs and taste. We will discuss custom components in detail in a later section of this article. For the sake of this section, we will briefly discuss the two custom components stated above. Option: This is the component responsible for displaying the options.

By targeting this component we were able to get the select element below:. In this section, we will take a look at some of the major props we use to customize the functionalities of our select component.

Below is an example of how some of these props come in handy. Above is the state manager prop onChange which we use to get the information about the currently select item.

Other props seen are the options and autoFocus props. The options prop is used to pass in select options to the select component. The options used in the code block above are:. The autoFocus prop which has a data type of boolean is used to add autoFocus to the select component on page load.

To know about props which are available for use you can check out the props documentation for react-select. Under styles and stateswe discussed two custom components option and control which we used to extend the select styling. In our App. This method is responsible for storing the value of the selected option in our state object called selectedOption. The line responsible for adding a background color to each selected option is the background: this.

In this section, we will take a look at how we can add a little animation to our react select component. The isMulti prop is used to make us select more than one option at once as we can see in the gif below:.Live demo: jedwatson. Then open localhost in a browser. You can also use the standalone build by including react-select. If you do this though you'll also need to include the dependencies. For example:. React-Select generates a hidden text field containing the selected value, so you can submit it as part of a standard form.

You can also listen for changes with the onChange event property. Options should be provided as an Array of Object s, each with a value and label property for rendering and searching. You can use a disabled property to indicate whether the option is disabled or not. Select className for the outer container.

The built-in Options renderer also support custom classNames, just add a className property to objects in the options array. Note: the clearable prop of the Select component should also be set to false to prevent allowing clearing all fields at once. If you want to load options asynchronously, instead of providing an options Array, provide a loadOptions Function.

The function takes two arguments String input, Function callback and will be called when the input text is changed. The select control will intelligently cache options for input strings that have already been fetched. The cached result set will be filtered as more specific searches are input, so if your async process would only return a smaller set of results for a more specific query, also pass complete: true in the callback object. Caching can be disabled by setting cache to false Note that complete: true will then have no effect.

Everything that applies to loadOptions with callbacks still applies to the Promises approach e. If you want to load options asynchronously externally from the Select component, you can have the Select component show a loading spinner by passing in the isLoading prop set to true. The Creatable component enables users to create new tags within react-select. The easiest way to use it is like so:.

It ties Async and Creatable components together and supports a union of their properties listed above.In this React tutorial, we will learn to work with React-select library in this tutorial. First, we will set up React JS project, and then inside the React app, we will install the React-select library to show you the React Dropdown select examples.

Include the following code in App. In the above code, we have imported the react-select and Bootstrap 4 modules in the App. We defined a Countries array and passed the countries name along with their respective country code. We will show these countries name when a user clicks on the React dropdown select element with the help of the react-select library.

We declared the render method and passed the HTML code inside of it such as container, row, and column from Bootstrap library to create the basic layout in our React app. This will do the magic and render the countries names as you can see in the screenshot above. Overview React-Select Properties React Dropdown Select allows easy customization, you can make the customization with the following properties.

You can check out more react-select properties here. React Multi Select Dropdown Here we will learn to choose multiple values in a React app using dropdown select element. Check out below how we can use isMulti prop to select various value in a select dropdown.

React Animated Multi Select Component We can also add the animation on React-select dropdown component, by using the following code.

In this tutorial, we tried to learn how to create an advance dropdown select using the react-select library. I hope you enjoyed this tutorial, please consider it sharing with others. Git Repo. Digamber Rawat is from Uttarakhand, located in northwestern part of India. He is a Full-stack developer by profession and a primary author of this blog. React-Select is profoundly easy to use dropdown library exclusively built for React.

The react-select library offers powerful multi-select, autocomplete, and AJAX support without any hassle. Property Detail autofocus Sets the Focus on control when it is mounted. Digamber Digamber Rawat is from Uttarakhand, located in northwestern part of India.


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