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Commit 8e9b2c3

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knadhknadh
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‎LICENSE

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The MIT License
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Copyright (c) 2020 Kailash Nadh. https://nadh.in
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.

‎README.md

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# dragmove.js
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A super tiny Javascript library to make DOM elements draggable and movable. Has touch screen support. Zero dependencies and 500 bytes Gzipped. [Demo here](https://knadh.github.io/dragmove.js/docs/).
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## Usage
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```shell
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npm install @knadh/dragmove
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```
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```javascript
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import { dragmove } from @knadh/dragmove;
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// (target, handler, onStart(target, x, y), onEnd(target, x, y)).
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// onStart and onEnd are optional callbacks that receive target element, and x, y co-oordinates.
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dragmove(document.querySelector("#box"), document.querySelector("#box .drag-handle"));
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```
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Licensed under the MIT License.

‎docs/dragmove.js

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/* eslint-disable */
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// Global states.
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let _loaded = false;
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let _callbacks = [];
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const _isTouch = window.ontouchstart !== undefined;
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export const dragmove = function(target, handler, onStart, onEnd) {
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// Register a global event to capture mouse moves (once).
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if (!_loaded) {
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document.addEventListener(_isTouch ? "touchmove" : "mousemove", function(e) {
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let c = e;
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if (e.touches) {
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c = e.touches[0];
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}
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// On mouse move, dispatch the coords to all registered callbacks.
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for (var i = 0; i < _callbacks.length; i++) {
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_callbacks[i](c.clientX, c.clientY);
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}
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});
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}
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_loaded = true;
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let isMoving = false, hasStarted = false;
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let startX = 0, startY = 0, lastX = 0, lastY = 0;
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// On the first click and hold, record the offset of the pointer in relation
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// to the point of click inside the element.
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handler.addEventListener(_isTouch ? "touchstart" : "mousedown", function(e) {
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e.stopPropagation();
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e.preventDefault();
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if (target.dataset.dragEnabled === "false") {
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return;
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}
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let c = e;
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if (e.touches) {
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c = e.touches[0];
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}
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isMoving = true;
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startX = target.offsetLeft - c.clientX;
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startY = target.offsetTop - c.clientY;
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});
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// On leaving click, stop moving.
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document.addEventListener(_isTouch ? "touchend" : "mouseup", function() {
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isMoving = false;
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hasStarted = false;
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if (onEnd) {
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onEnd(target, parseInt(target.style.left), parseInt(target.style.top));
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}
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});
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// Register mouse-move callback to move the element.
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_callbacks.push(function move(x, y) {
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if (!isMoving) {
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return;
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}
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if (!hasStarted) {
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hasStarted = true;
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if (onStart) {
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onStart(target, lastX, lastY);
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}
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}
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lastX = x + startX;
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lastY = y + startY;
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// If boundary checking is on, don't let the element cross the viewport.
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if (target.dataset.dragBoundary === "true") {
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if (lastX < 1 || lastX >= window.innerWidth - target.offsetWidth) {
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return;
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}
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if (lastY < 1 || lastY >= window.innerHeight - target.offsetHeight) {
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return;
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}
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}
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target.style.left = lastX + "px";
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target.style.top = lastY + "px";
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});
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}
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export { dragmove as default };

‎docs/index.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charSet="utf-8"/>
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<style>
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body {
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font-family: "Helvetica Neue", "Segoe UI", sans-serif;
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}
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.parent {
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background: #ddd;
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position: fixed;
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top: 25%;
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left: 10%;
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width: 150px;
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height: 150px;
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}
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.handle {
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background: #888;
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cursor: move;
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width: 130px;
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color: #fff;
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padding: 10px;
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}
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#test2 {
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background: #888;
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left: auto;
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right: 10%;
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}
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#test2 .handle {
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background: #ddd;
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color: #888;
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}
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</style>
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</head>
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<body>
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<p><a href="https://github.com/knadh/dragmove.js"><small>dragmove.js</small></a></p>
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<div id="test" class="parent" data-drag-bound="true">
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<div class="handle" style="">Drag here</div>
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</div>
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<div id="test2" class="parent">
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<div class="handle" style="">Drag here</div>
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</div>
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<script type="module">
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import { dragmove } from './dragmove.js';
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// Use the start/end events to simulate "snap to edge" behaviour.
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const snapThreshold = 50;
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function onStart(el, x, y) {
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// On drag start, remove the fixed bottom style to prevent the bottom
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// from sticking on the screen.
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el.style.top = el.offsetTop + "px"
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el.style.bottom = "auto"
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}
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function onEnd(el, x, y) {
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// Automatically snap to corners.
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if (window.innerHeight - (el.offsetTop + el.offsetHeight) < snapThreshold) {
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el.style.top = "auto"
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el.style.bottom = "0px"
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}
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if (window.innerWidth - (el.offsetLeft + el.offsetWidth) < snapThreshold) {
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el.style.left = "auto"
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el.style.right = "0px"
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}
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if (el.offsetTop < snapThreshold) {
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el.style.top = "0px"
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}
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if (el.offsetLeft < snapThreshold) {
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el.style.left = "0px"
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}
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}
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(function() {
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dragmove(document.querySelector("#test"),
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document.querySelector("#test .handle"), onStart, onEnd);
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dragmove(document.querySelector("#test2"),
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document.querySelector("#test2 .handle"), onStart, onEnd);
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})();
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</script>
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</body>
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</html>

‎dragmove.js

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// https://github.com/knadh/dragmove.js
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// Kailash Nadh (c) 2020.
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// MIT License.
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let _loaded = false;
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let _callbacks = [];
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const _isTouch = window.ontouchstart !== undefined;
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export const dragmove = function(target, handler, onStart, onEnd) {
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// Register a global event to capture mouse moves (once).
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if (!_loaded) {
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document.addEventListener(_isTouch ? "touchmove" : "mousemove", function(e) {
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let c = e;
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if (e.touches) {
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c = e.touches[0];
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}
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// On mouse move, dispatch the coords to all registered callbacks.
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for (var i = 0; i < _callbacks.length; i++) {
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_callbacks[i](c.clientX, c.clientY);
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}
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});
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}
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_loaded = true;
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let isMoving = false, hasStarted = false;
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let startX = 0, startY = 0, lastX = 0, lastY = 0;
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// On the first click and hold, record the offset of the pointer in relation
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// to the point of click inside the element.
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handler.addEventListener(_isTouch ? "touchstart" : "mousedown", function(e) {
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e.stopPropagation();
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e.preventDefault();
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if (target.dataset.dragEnabled === "false") {
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return;
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}
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let c = e;
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if (e.touches) {
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c = e.touches[0];
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}
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isMoving = true;
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startX = target.offsetLeft - c.clientX;
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startY = target.offsetTop - c.clientY;
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});
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// On leaving click, stop moving.
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document.addEventListener(_isTouch ? "touchend" : "mouseup", function() {
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isMoving = false;
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hasStarted = false;
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if (onEnd) {
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onEnd(target, parseInt(target.style.left), parseInt(target.style.top));
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}
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});
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// Register mouse-move callback to move the element.
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_callbacks.push(function move(x, y) {
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if (!isMoving) {
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return;
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}
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if (!hasStarted) {
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hasStarted = true;
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if (onStart) {
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onStart(target, lastX, lastY);
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}
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}
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lastX = x + startX;
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lastY = y + startY;
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// If boundary checking is on, don't let the element cross the viewport.
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if (target.dataset.dragBoundary === "true") {
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if (lastX < 1 || lastX >= window.innerWidth - target.offsetWidth) {
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return;
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}
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if (lastY < 1 || lastY >= window.innerHeight - target.offsetHeight) {
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return;
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}
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}
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target.style.left = lastX + "px";
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target.style.top = lastY + "px";
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});
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}
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export { dragmove as default };

‎package.json

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{
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"name": "@knadh/dragmove",
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"version": "0.1.0",
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"description": "A tiny, zero-dependency library for making DOM elements draggable.",
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"main": "dragmove.js",
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"files": [
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"dragmove.js"
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],
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"scripts": {
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"test": "echo \"Error: no test specified\" && exit 1"
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},
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"repository": {
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"type": "git",
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"url": "git+https://github.com/knadh/dragmove.js.git"
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},
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"keywords": [
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"drag",
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"drop",
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"move"
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],
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"author": "Kailash Nadh",
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"license": "MIT",
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"bugs": {
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"url": "https://github.com/knadh/dragmove.js/issues"
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},
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"homepage": "https://github.com/knadh/dragmove.js#readme",
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"publishConfig": {
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"access": "public"
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}
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}

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