How can I select elements by class name in JavaScript?
Antek N

To select elements by class name in JavaScript, you can use thegetElementsByClassName() method or thequerySelectorAll() method. Here's a step-by-step guide on how to achieve this: 1. Use thegetElementsByClassName() method: ThegetElementsByClassName() method allows you to select elements based on their class name. It returns a live HTMLCollection of elements that match the specified class name.

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   const elements = document.getElementsByClassName('myClass');

Replace'myClass' with the desired class name you want to select. This method searches for elements within the entire document or a specific element and returns a collection of matching elements. 2. Iterate over the selected elements: To work with the selected elements, you can iterate over the HTMLCollection using a loop, such as afor loop or aforEach() loop.

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   for (let i = 0; i < elements.length; i++) {
     const element = elements[i];
     // Perform operations on each element
     console.log(element);
   }

In this example, each element matching the class name'myClass' is accessed within the loop. 3. Use thequerySelectorAll() method: Alternatively, you can use thequerySelectorAll() method, which allows you to select elements using a CSS selector. It returns a static NodeList of elements that match the selector.

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   const elements = document.querySelectorAll('.myClass');

The CSS selector'.myClass' selects all elements with the class name'myClass'. Similar to thegetElementsByClassName() method, you can iterate over the NodeList using a loop or use array methods likeforEach() to work with the selected elements. 4. Perform operations on the selected elements: Once you have selected the elements, you can perform various operations on them, such as modifying their styles, manipulating their content, or attaching event listeners. For example, to change the text content of each selected element:

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   for (let i = 0; i < elements.length; i++) {
     const element = elements[i];
     element.textContent = 'Updated content';
   }

This example changes the text content of each selected element to'Updated content'. Choose the method that best fits your requirements and the specific context in which you need to select elements by class name. ThegetElementsByClassName() method is recommended when you want a live collection of elements, while thequerySelectorAll() method offers more flexibility with CSS selectors. Both methods allow you to select elements by class name and perform operations on the selected elements.

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