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How Can I Make HTML Elements Resizable Using Only Vanilla JavaScript?

Mary-Kate Olsen
Release: 2024-12-08 07:51:15
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How Can I Make HTML Elements Resizable Using Only Vanilla JavaScript?

Creating Resizable HTML Elements Using Vanilla JavaScript

The task of making HTML elements, such as

or

tags, resizable when clicked can be achieved without relying on external libraries like jQuery. Here's how you can accomplish this using pure JavaScript:

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var p = document.querySelector('p'); // element to make resizable

 

p.addEventListener('click', function init() {

    p.removeEventListener('click', init, false);

    p.className = p.className + ' resizable';

    var resizer = document.createElement('div');

    resizer.className = 'resizer';

    p.appendChild(resizer);

    resizer.addEventListener('mousedown', initDrag, false);

}, false);

 

var startX, startY, startWidth, startHeight;

 

function initDrag(e) {

   startX = e.clientX;

   startY = e.clientY;

   startWidth = parseInt(document.defaultView.getComputedStyle(p).width, 10);

   startHeight = parseInt(document.defaultView.getComputedStyle(p).height, 10);

   document.documentElement.addEventListener('mousemove', doDrag, false);

   document.documentElement.addEventListener('mouseup', stopDrag, false);

}

 

function doDrag(e) {

   p.style.width = (startWidth + e.clientX - startX) + 'px';

   p.style.height = (startHeight + e.clientY - startY) + 'px';

}

 

function stopDrag(e) {

    document.documentElement.removeEventListener('mousemove', doDrag, false);

    document.documentElement.removeEventListener('mouseup', stopDrag, false);

}

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This code adds a 'resizable' class to the target element and appends an additional

with class 'resizer' to the element. When the 'resizer' is clicked, the mouse drag and drop events are captured to dynamically adjust the width and height of the target element based on the mouse movements.

Keep in mind that this solution may not be compatible with all browsers. For a more robust implementation, consider using a JavaScript library dedicated to element resizing.

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