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Is There A Javascript Equivalent To Using Media Query Duplicate

When it comes to building responsive web designs, media queries are the go-to tool for developers. They allow us to adapt our layouts based on the user's device or screen size. But what if you find yourself repeating the same media query across multiple CSS rules in your project? Is there a JavaScript equivalent to using media query duplicate? The answer is yes! Let's dive into how you can achieve similar functionality using JavaScript.

One technique you can use is to dynamically check the viewport width and apply styles accordingly. You can achieve this by adding an event listener to the window object for the 'resize' event. This way, whenever the user resizes their browser window, your JavaScript code will be triggered to adjust the styles.

Here is an example of how you can achieve this:

Javascript

function checkWidth() {
  const viewportWidth = window.innerWidth;
  
  if (viewportWidth < 768) {
    // Apply styles for small screens
    document.body.style.backgroundColor = 'lightblue';
  } else if (viewportWidth < 1024) {
    // Apply styles for medium screens
    document.body.style.backgroundColor = 'lightgreen';
  } else {
    // Default styles for larger screens
    document.body.style.backgroundColor = 'lightgrey';
  }
}

// Initial check on page load
checkWidth();

// Listen for window resize events
window.addEventListener('resize', checkWidth);

In this example, we define a function `checkWidth` that gets the viewport width using `window.innerWidth`. Based on the viewport width, we apply different styles to the `body` element. We then call `checkWidth` initially to set the styles on page load and add an event listener to trigger the function whenever the window is resized.

Another approach is to use CSS custom properties (variables) in conjunction with JavaScript to achieve dynamic styling based on viewport width. You can define your media query breakpoints as CSS variables and update them using JavaScript. Here's how you can do it:

Css

:root {
  --breakpoint-small: 768px;
  --breakpoint-medium: 1024px;
}

@media (max-width: var(--breakpoint-small)) {
  body {
    background-color: lightblue;
  }
}

@media (min-width: var(--breakpoint-small)) and (max-width: var(--breakpoint-medium)) {
  body {
    background-color: lightgreen;
  }
}

Javascript

function updateBreakpoints() {
  const viewportWidth = window.innerWidth;
  
  document.documentElement.style.setProperty('--breakpoint-small', viewportWidth < 768 ? '768px' : '0px');
  document.documentElement.style.setProperty('--breakpoint-medium', viewportWidth < 1024 ? '1024px' : '0px');
}

// Initial breakpoint update
updateBreakpoints();

// Listen for window resize events
window.addEventListener('resize', updateBreakpoints);

In this example, we define CSS variables for our breakpoints and update them dynamically based on the viewport width using JavaScript. This allows us to maintain a separation of concerns between styling and logic while achieving responsive design.

By using JavaScript in combination with CSS, you can create a more flexible and dynamic approach to handling responsive design without duplicating media queries across your stylesheets. Experiment with these techniques in your projects to see how they can improve your development workflow and help you build more adaptive web designs. Happy coding!

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