how can i remove an event from web page at specific view point

[BrilliantBrilliant is verified member.]

To remove an event or element from a webpage at a specific viewport size (e.g., when the browser window is resized to a particular width or height), you can use a combination of CSS media queries and JavaScript event listeners. Here’s how:


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1. Using CSS (for styling or hiding an element)

You can hide the element by setting its display property to none for specific viewport sizes.

@media (max-width: 768px) {

  .event-class {

    display: none; /* Hides the element */

  }

}

2. Using JavaScript (for removing an event listener or element dynamically)

You can use the resize event to detect the viewport size and take action.

Example 1: Removing an Event Listener

function myEventFunction() {

  console.log("Event triggered!");

}



function checkViewport() {

  const width = window.innerWidth;



  if (width <= 768) {

    // Remove the event if the viewport width is 768px or smaller

    document.getElementById("myElement").removeEventListener("click", myEventFunction);

  } else {

    // Add the event back for larger viewports

    document.getElementById("myElement").addEventListener("click", myEventFunction);

  }

}



// Add an initial event listener

document.getElementById("myElement").addEventListener("click", myEventFunction);



// Listen for window resizing

window.addEventListener("resize", checkViewport);

Example 2: Removing an Element

function checkViewport() {

  const width = window.innerWidth;



  if (width <= 768) {

    // Remove the element from the DOM if the viewport width is 768px or smaller

    const element = document.getElementById("myElement");

    if (element) {

      element.remove();

    }

  }

}



// Check on page load and resize

window.addEventListener("load", checkViewport);

window.addEventListener("resize", checkViewport);

3. Combining CSS and JavaScript

If you only need to hide an element at certain viewports but still want to handle it in JavaScript, you can check its visibility via CSS and act accordingly.

function checkViewport() {

  const element = document.getElementById("myElement");



  // Check if the element is hidden using computed styles

  const isHidden = window.getComputedStyle(element).display === "none";



  if (isHidden) {

    console.log("Element is hidden, removing event listener.");

    element.removeEventListener("click", myEventFunction);

  } else {

    console.log("Element is visible, adding event listener.");

    element.addEventListener("click", myEventFunction);

  }

}



function myEventFunction() {

  alert("Event triggered!");

}



window.addEventListener("resize", checkViewport);

checkViewport(); // Run on page load





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Key Points

CSS media queries: Use for styling or conditionally hiding elements.

JavaScript: Use for dynamically managing events or removing elements.

Combine both if necessary for more flexible control.