Map over the options array is a clever way to generate option tags for select from an array in React. This article will help you understand the essence and details of each step of this method.
Generate option tags for select from an array in React
The <select> tag is commonly used in HTML. The <select> tags are the components that make up the form to help collect information from the user. Inside the <select> tags are <option> tags, where programmers create options. When displayed on the website, these <select> tags are the dropdown lists. Every time the user clicks on the drop-down list, a series of options will appear and the user will choose one of these options. Here are some ways to generate option tags for select from an array in React.
Map over the options array
We will render each element in the array to the options in the <select> tag using the map() method. The key will serve as the index for the options, and the value will be the string value of the array’s elements. To learn more about this approach, look at the illustration below.
Code:
const App = () => {
const cities = ["NewYork", "Tokyo", "London"];
return (
<div>
<h2>Choose your city:</h2>
<select name="city" id="city-select">
{cities.map((city, i) => (
<option key={i} value={city}>
{city}
</option>
))}
</select>
</div>
);
};
export default App;Output:
When you run the above code, you will get a <select> tag with options rendered from the predefined cities array above.
Use the array index method
This way, we will create a clone array of the indexes of the original array containing the options of the <select> tag. And when we map this index array, we will use the array[index] syntax to refer to the value of the array containing the options.
Code:
const App = () => {
const genders = ["Male", "Female"];
const numbers = [0, 1];
return (
<div>
<h2>Choose gender:</h2>
<select name="gender" id="gender-select">
{numbers.map((number) => (
<option key={number} value={genders[number]}>
{genders[number]}
</option>
))}
</select>
</div>
);
};
export default App;Output:
When we map through the numbers array, we will pass the value to the option with the key and value in the genders array. So we were able to generate <option> tags for select from an array in React using the two methods above.
Summary
In this article, I have provided a method to generate option tags for selecting from an array in React. I hope these methods will be helpful to you. Thanks for reading!
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Hi, my name’s Nathaniel Kirk. I’m interested in learning and sharing knowledge about programming languages. My strengths are C, C++, Python, HTML, CSS, Javascript, and Reactjs. If you have difficulty with them, don’t worry. I’m here to support you.
Name of the university: PTIT
Major: IT
Programming Languages: C, C++, Python, HTML, CSS, Javascript, Reactjs