How to make HTML element resizable using pure javascript?

I was wondering how we can make a HTML element like <div> or <p> tag element resizable when clicked using pure JavaScript, not the jQuery library or any other library.

Answers


I really recommend using some sort of library, but you asked for it, you get it:

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);
}

Demo

Remember that this may not run in all browsers (tested only in Firefox, definitely not working in IE <9).


what about a pure css3 solution?

div {
    resize: both;
    overflow: auto;
} 

MDN Web Docs

W3Schools example

Browser support


Is simple:

Example:https://jsfiddle.net/RainStudios/mw786v1w/

var element = document.getElementById('element');
//create box in bottom-left
var resizer = document.createElement('div');
resizer.style.width = '10px';
resizer.style.height = '10px';
resizer.style.background = 'red';
resizer.style.position = 'absolute';
resizer.style.right = 0;
resizer.style.bottom = 0;
resizer.style.cursor = 'se-resize';
//Append Child to Element
element.appendChild(resizer);
//box function onmousemove
resizer.addEventListener('mousedown', initResize, false);

//Window funtion mousemove & mouseup
function initResize(e) {
   window.addEventListener('mousemove', Resize, false);
   window.addEventListener('mouseup', stopResize, false);
}
//resize the element
function Resize(e) {
   element.style.width = (e.clientX - element.offsetLeft) + 'px';
   element.style.height = (e.clientY - element.offsetTop) + 'px';
}
//on mouseup remove windows functions mousemove & mouseup
function stopResize(e) {
    window.removeEventListener('mousemove', Resize, false);
    window.removeEventListener('mouseup', stopResize, false);
}

See my cross browser compatible resizer.

    <!doctype html>
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>resizer</title>
        <meta name="author" content="Andrej Hristoliubov anhr@mail.ru">
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <script type="text/javascript" src="https://rawgit.com/anhr/resizer/master/Common.js"></script>
        <script type="text/javascript" src="https://rawgit.com/anhr/resizer/master/resizer.js"></script>
        <style>
            .element {
                border: 1px solid #999999;
                border-radius: 4px;
                margin: 5px;
                padding: 5px;
            }
        </style>
        <script type="text/javascript">
            function onresize() {
                var element1 = document.getElementById("element1");
                var element2 = document.getElementById("element2");
                var element3 = document.getElementById("element3");
                var ResizerY = document.getElementById("resizerY");
                ResizerY.style.top = element3.offsetTop - 15 + "px";
                var topElements = document.getElementById("topElements");
                topElements.style.height = ResizerY.offsetTop - 20 + "px";
                var height = topElements.clientHeight - 32;
                if (height < 0)
                    height = 0;
                height += 'px';
                element1.style.height = height;
                element2.style.height = height;
            }
            function resizeX(x) {
                //consoleLog("mousemove(X = " + e.pageX + ")");
                var element2 = document.getElementById("element2");
                element2.style.width =
                    element2.parentElement.clientWidth
                    + document.getElementById('rezizeArea').offsetLeft
                    - x
                    + 'px';
            }
            function resizeY(y) {
                //consoleLog("mousemove(Y = " + e.pageY + ")");
                var element3 = document.getElementById("element3");
                var height =
                    element3.parentElement.clientHeight
                    + document.getElementById('rezizeArea').offsetTop
                    - y
                ;
                //consoleLog("mousemove(Y = " + e.pageY + ") height = " + height + " element3.parentElement.clientHeight = " + element3.parentElement.clientHeight);
                if ((height + 100) > element3.parentElement.clientHeight)
                    return;//Limit of the height of the elemtnt 3
                element3.style.height = height + 'px';
                onresize();
            }
            var emailSubject = "Resizer example error";
        </script>
    </head>
    <body>
        <div id='Message'></div>
        <h1>Resizer</h1>
        <p>Please see example of resizing of the HTML element by mouse dragging.</p>
        <ul>
            <li>Drag the red rectangle if you want to change the width of the Element 1 and Element 2</li>
            <li>Drag the green rectangle if you want to change the height of the Element 1 Element 2 and Element 3</li>
            <li>Drag the small blue square at the left bottom of the Element 2, if you want to resize of the Element 1 Element 2 and Element 3</li>
        </ul>
        <div id="rezizeArea" style="width:1000px; height:250px; overflow:auto; position: relative;" class="element">
            <div id="topElements" class="element" style="overflow:auto; position:absolute; left: 0; top: 0; right:0;">
                <div id="element2" class="element" style="width: 30%; height:10px; float: right; position: relative;">
                    Element 2
                    <div id="resizerXY" style="width: 10px; height: 10px; background: blue; position:absolute; left: 0; bottom: 0;"></div>
                    <script type="text/javascript">
                        resizerXY("resizerXY", function (e) {
                                resizeX(e.pageX + 10);
                                resizeY(e.pageY + 50);
                            });
                    </script>
                </div>
                <div id="resizerX" style="width: 10px; height:100%; background: red; float: right;"></div>
                <script type="text/javascript">
                    resizerX("resizerX", function (e) {
                        resizeX(e.pageX + 25);
                    });
                </script>
                <div id="element1" class="element" style="height:10px; overflow:auto;">Element 1</div>
            </div>
            <div id="resizerY" style="height:10px; position:absolute; left: 0; right:0; background: green;"></div>
            <script type="text/javascript">
                resizerY("resizerY", function (e) {
                    resizeY(e.pageY + 25);
                });
            </script>
            <div id="element3" class="element" style="height:100px; position:absolute; left: 0; bottom: 0; right:0;">Element 3</div>
        </div>
        <script type="text/javascript">
            onresize();
        </script>
    </body>
    </html>

I just created a CodePen that shows how this can be done pretty easily using ES6.

http://codepen.io/travist/pen/GWRBQV

Basically, here is the class that does this.

let getPropertyValue = function(style, prop) {
  let value = style.getPropertyValue(prop);
  value = value ? value.replace(/[^0-9.]/g, '') : '0';
  return parseFloat(value);
}

let getElementRect = function(element) {
  let style = window.getComputedStyle(element, null);
  return {
    x: getPropertyValue(style, 'left'),
    y: getPropertyValue(style, 'top'),
    width: getPropertyValue(style, 'width'),
    height: getPropertyValue(style, 'height')
  }
}

class Resizer {
    constructor(wrapper, element, options) {
        this.wrapper = wrapper;
        this.element = element;
        this.options = options;
        this.offsetX = 0;
        this.offsetY = 0;
        this.handle = document.createElement('div');
        this.handle.setAttribute('class', 'drag-resize-handlers');
        this.handle.setAttribute('data-direction', 'br');
        this.wrapper.appendChild(this.handle);
        this.wrapper.style.top = this.element.style.top;
        this.wrapper.style.left = this.element.style.left;
        this.wrapper.style.width = this.element.style.width;
        this.wrapper.style.height = this.element.style.height;
        this.element.style.position = 'relative';
        this.element.style.top = 0;
        this.element.style.left = 0;
        this.onResize = this.resizeHandler.bind(this);
        this.onStop = this.stopResize.bind(this);
        this.handle.addEventListener('mousedown', this.initResize.bind(this));
    }

    initResize(event) {
        this.stopResize(event, true);
        this.handle.addEventListener('mousemove', this.onResize);
        this.handle.addEventListener('mouseup', this.onStop);
    }

    resizeHandler(event) {
        this.offsetX = event.clientX - (this.wrapper.offsetLeft + this.handle.offsetLeft);
        this.offsetY = event.clientY - (this.wrapper.offsetTop + this.handle.offsetTop);
        let wrapperRect = getElementRect(this.wrapper);
        let elementRect = getElementRect(this.element);
        this.wrapper.style.width = (wrapperRect.width + this.offsetX) + 'px';
        this.wrapper.style.height = (wrapperRect.height + this.offsetY) + 'px';
        this.element.style.width = (elementRect.width + this.offsetX) + 'px';
        this.element.style.height = (elementRect.height + this.offsetY) + 'px';
    }

    stopResize(event, nocb) {
        this.handle.removeEventListener('mousemove', this.onResize); 
        this.handle.removeEventListener('mouseup', this.onStop);
    }
}

class Dragger {
    constructor(wrapper, element, options) {
        this.wrapper = wrapper;
        this.options = options;
        this.element = element;
        this.element.draggable = true;
        this.element.setAttribute('draggable', true);
        this.element.addEventListener('dragstart', this.dragStart.bind(this));
    }

    dragStart(event) {
        let wrapperRect = getElementRect(this.wrapper);
        var x = wrapperRect.x - parseFloat(event.clientX);
        var y = wrapperRect.y - parseFloat(event.clientY);
        event.dataTransfer.setData("text/plain", this.element.id + ',' + x + ',' + y);
    }

    dragStop(event, prevX, prevY) {
        var posX = parseFloat(event.clientX) + prevX;
        var posY = parseFloat(event.clientY) + prevY;
        this.wrapper.style.left = posX + 'px';
        this.wrapper.style.top = posY + 'px';
    }
}

class DragResize {
    constructor(element, options) {
        options = options || {};
        this.wrapper = document.createElement('div');
        this.wrapper.setAttribute('class', 'tooltip drag-resize');
        if (element.parentNode) {
          element.parentNode.insertBefore(this.wrapper, element);
        }
        this.wrapper.appendChild(element);
        element.resizer = new Resizer(this.wrapper, element, options);
        element.dragger = new Dragger(this.wrapper, element, options);
    }
}

document.body.addEventListener('dragover', function (event) {
    event.preventDefault();
    return false;
});

document.body.addEventListener('drop', function (event) {
    event.preventDefault();
    var dropData = event.dataTransfer.getData("text/plain").split(',');
    var element = document.getElementById(dropData[0]);
    element.dragger.dragStop(event, parseFloat(dropData[1]), parseFloat(dropData[2]));
    return false;
});

I have created a function that recieve an id of an html element and adds a border to it's right side the function is general and just recieves an id so you can copy it as it is and it will work

var myoffset;
function resizeE(elem){
    var borderDiv = document.createElement("div");
    borderDiv.className = "border";
    borderDiv.addEventListener("mousedown",myresize = function myrsize(e) {
	    myoffset = e.clientX - (document.getElementById(elem).offsetLeft + parseInt(window.getComputedStyle(document.getElementById(elem)).getPropertyValue("width")));
	    window.addEventListener("mouseup",mouseUp);
	    document.addEventListener("mousemove",mouseMove = function mousMove(e) {
	   	 document.getElementById(elem).style.width = `${e.clientX -  myoffset - document.getElementById(elem).offsetLeft}px`;
		});
	});
    document.getElementById(elem).appendChild(borderDiv);
}

function mouseUp() {
    document.removeEventListener("mousemove", mouseMove);
    window.removeEventListener("mouseup",mouseUp);
}

function load() 
{
	resizeE("resizeableDiv");
	resizeE("anotherresizeableDiv");
  resizeE("anotherresizeableDiv1");
}
.border {

  position: absolute;
  cursor: e-resize;
  width: 9px;
  right: -5px;
  top: 0;
  height: 100%;
}

#resizeableDiv {
  width: 30vw;
  height: 30vh;
  background-color: #84f4c6;
  position: relative;
}
#anotherresizeableDiv {
  width: 30vw;
  height: 30vh;
  background-color: #9394f4;
  position: relative;
}
#anotherresizeableDiv1 {
  width: 30vw;
  height: 30vh;
  background-color: #43f4f4;
  position: relative;
}
#anotherresizeableDiv1 .border{
  background-color: black;
}
#anotherresizeableDiv .border{
  width: 30px;
  right: -200px;
  background-color: green;
}
<body onload="load()">

  <div id="resizeableDiv">change my size with the east border</div>
  <div id="anotherresizeableDiv1">with visible border</div>
</body>
  <div id="anotherresizeableDiv">with editted outside border</div>
</body>

I found this example working fine though it requires JQuery which shouldn't be a problem now.

HTML:

<div id="container">
    <div id="left_panel"> left content! </div>
    <div id="right_panel">
        <div id="drag"></div> right content!
    </div>
</div>

JS:

var isResizing = false,
    lastDownX = 0;

$(function () {
    var container = $('#container'),
        left = $('#left_panel'),
        right = $('#right_panel'),
        handle = $('#drag');

    handle.on('mousedown', function (e) {
        isResizing = true;
        lastDownX = e.clientX;
    });

    $(document).on('mousemove', function (e) {
        // we don't want to do anything if we aren't resizing.
        if (!isResizing) 
            return;

        var offsetRight = container.width() - (e.clientX - container.offset().left);

        left.css('right', offsetRight);
        right.css('width', offsetRight);
    }).on('mouseup', function (e) {
        // stop resizing
        isResizing = false;
    });
});

CSS:

body, html {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}
#container {
    width: 100%;
    height: 100%;

}
 #left_panel {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    right: 100px;
    background: grey;
}

#right_panel {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 200px;
    color:#fff;
    background: black;
}
 #drag {
    position: absolute;
    left: -4px;
    top: 0;
    bottom: 0;
    width: 8px;
    cursor: w-resize;
}

and the Fiddle: http://jsfiddle.net/JerryGoyal/T4St6/704/


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