input 文字输入特效

前端使用电源模式(power mode)特效

本项目为在 activate-power-mode 的基础上整理后的增强版本。
本项目用 webpack 重新构建,并在其基础上修改了一些配置,现在支持 textarea、text、search、tel、url 五种输入框的输入特效。
本项目GitHub地址:https://github.com/lyswhut/html-activate-power-mode
demo地址:https://lyswhut.github.io/html-activate-power-mode/dist/index.html


<html>
<head></head>
<body>
<textarea style="position: relative; top: 20%; left: 20%;" cols="100" rows="30"></textarea>
</body>
<script>
(function webpackUniversalModuleDefinition(root, factory) {
if(typeof exports === 'object' && typeof module === 'object')
module.exports = factory();
else if(typeof define === 'function' && define.amd)
define([], factory);
else if(typeof exports === 'object')
exports["POWERMODE"] = factory();
else
root["POWERMODE"] = factory();
})(this, function() {
return /******/ (function(modules) { // webpackBootstrap
/******/ 	// The module cache
/******/ 	var installedModules = {};
/******/ 	// The require function
/******/ 	function __webpack_require__(moduleId) {
/******/ 		// Check if module is in cache
/******/ 		if(installedModules[moduleId])
/******/ 			return installedModules[moduleId].exports;
/******/ 		// Create a new module (and put it into the cache)
/******/ 		var module = installedModules[moduleId] = {
/******/ 			exports: {},
/******/ 			id: moduleId,
/******/ 			loaded: false
/******/ 		};
/******/ 		// Execute the module function
/******/ 		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/ 		// Flag the module as loaded
/******/ 		module.loaded = true;
/******/ 		// Return the exports of the module
/******/ 		return module.exports;
/******/ 	}
/******/ 	// expose the modules object (__webpack_modules__)
/******/ 	__webpack_require__.m = modules;
/******/ 	// expose the module cache
/******/ 	__webpack_require__.c = installedModules;
/******/ 	// __webpack_public_path__
/******/ 	__webpack_require__.p = "";
/******/ 	// Load entry module and return exports
/******/ 	return __webpack_require__(0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ (function(module, exports, __webpack_require__) {
'use strict';
var canvas = document.createElement('canvas');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
canvas.style.cssText = 'position:fixed;top:0;left:0;pointer-events:none;z-index:999999';
window.addEventListener('resize', function () {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
});
document.body.appendChild(canvas);
var context = canvas.getContext('2d');
var particles = [];
var particlePointer = 0;
var rendering = false;
POWERMODE.shake = true;
function getRandom(min, max) {
return Math.random() * (max - min) + min;
}
function getColor(el) {
if (POWERMODE.colorful) {
var u = getRandom(0, 360);
return 'hsla(' + getRandom(u - 10, u + 10) + ', 100%, ' + getRandom(50, 80) + '%, ' + 1 + ')';
} else {
return window.getComputedStyle(el).color;
}
}
function getCaret() {
var el = document.activeElement;
var bcr;
if (el.tagName === 'TEXTAREA' ||
(el.tagName === 'INPUT' && el.getAttribute('type') === 'text')) {
var offset = __webpack_require__(1)(el, el.selectionEnd);
bcr = el.getBoundingClientRect();
return {
x: offset.left + bcr.left,
y: offset.top + bcr.top,
color: getColor(el)
};
}
var selection = window.getSelection();
if (selection.rangeCount) {
var range = selection.getRangeAt(0);
var startNode = range.startContainer;
if (startNode.nodeType === document.TEXT_NODE) {
startNode = startNode.parentNode;
}
bcr = range.getBoundingClientRect();
return {
x: bcr.left,
y: bcr.top,
color: getColor(startNode)
};
}
return { x: 0, y: 0, color: 'transparent' };
}
function createParticle(x, y, color) {
return {
x: x,
y: y,
alpha: 1,
color: color,
velocity: {
x: -1 + Math.random() * 2,
y: -3.5 + Math.random() * 2
}
};
}
function POWERMODE() {
{ // spawn particles
var caret = getCaret();
var numParticles = 5 + Math.round(Math.random() * 10);
while (numParticles--) {
particles[particlePointer] = createParticle(caret.x, caret.y, caret.color);
particlePointer = (particlePointer + 1) % 500;
}
}
{ // shake screen
if (POWERMODE.shake) {
var intensity = 1 + 2 * Math.random();
var x = intensity * (Math.random() > 0.5 ? -1 : 1);
var y = intensity * (Math.random() > 0.5 ? -1 : 1);
document.body.style.marginLeft = x + 'px';
document.body.style.marginTop = y + 'px';
setTimeout(function() {
document.body.style.marginLeft = '';
document.body.style.marginTop = '';
}, 75);
}
}
if(!rendering){
requestAnimationFrame(loop);
}
};
POWERMODE.colorful = false;
function loop() {
rendering = true;
context.clearRect(0, 0, canvas.width, canvas.height);
var rendered = false;
var rect = canvas.getBoundingClientRect();
for (var i = 0; i < particles.length; ++i) {
var particle = particles[i];
if (particle.alpha <= 0.1) continue;
particle.velocity.y += 0.075;
particle.x += particle.velocity.x;
particle.y += particle.velocity.y;
particle.alpha *= 0.96;
context.globalAlpha = particle.alpha;
context.fillStyle = particle.color;
context.fillRect(
Math.round(particle.x - 1.5) - rect.left,
Math.round(particle.y - 1.5) - rect.top,
3, 3
);
rendered = true;
}
if(rendered){
requestAnimationFrame(loop);
}else{
rendering = false;
}
}
module.exports = POWERMODE;
/***/ }),
/* 1 */
/***/ (function(module, exports) {
/* jshint browser: true */
(function () {
// The properties that we copy into a mirrored div.
// Note that some browsers, such as Firefox,
// do not concatenate properties, i.e. padding-top, bottom etc. -> padding,
// so we have to do every single property specifically.
var properties = [
'direction',  // RTL support
'boxSizing',
'width',  // on Chrome and IE, exclude the scrollbar, so the mirror div wraps exactly as the textarea does
'height',
'overflowX',
'overflowY',  // copy the scrollbar for IE
'borderTopWidth',
'borderRightWidth',
'borderBottomWidth',
'borderLeftWidth',
'borderStyle',
'paddingTop',
'paddingRight',
'paddingBottom',
'paddingLeft',
// https://developer.mozilla.org/en-US/docs/Web/CSS/font
'fontStyle',
'fontVariant',
'fontWeight',
'fontStretch',
'fontSize',
'fontSizeAdjust',
'lineHeight',
'fontFamily',
'textAlign',
'textTransform',
'textIndent',
'textDecoration',  // might not make a difference, but better be safe
'letterSpacing',
'wordSpacing',
'tabSize',
'MozTabSize'
];
var isFirefox = window.mozInnerScreenX != null;
function getCaretCoordinates(element, position, options) {
var debug = options && options.debug || false;
if (debug) {
var el = document.querySelector('#input-textarea-caret-position-mirror-div');
if ( el ) { el.parentNode.removeChild(el); }
}
// mirrored div
var div = document.createElement('div');
div.id = 'input-textarea-caret-position-mirror-div';
document.body.appendChild(div);
var style = div.style;
var computed = window.getComputedStyle? getComputedStyle(element) : element.currentStyle;  // currentStyle for IE < 9
// default textarea styles
style.whiteSpace = 'pre-wrap';
if (element.nodeName !== 'INPUT')
style.wordWrap = 'break-word';  // only for textarea-s
// position off-screen
style.position = 'absolute';  // required to return coordinates properly
if (!debug)
style.visibility = 'hidden';  // not 'display: none' because we want rendering
// transfer the element's properties to the div
properties.forEach(function (prop) {
style[prop] = computed[prop];
});
if (isFirefox) {
// Firefox lies about the overflow property for textareas: https://bugzilla.mozilla.org/show_bug.cgi?id=984275
if (element.scrollHeight > parseInt(computed.height))
style.overflowY = 'scroll';
} else {
style.overflow = 'hidden';  // for Chrome to not render a scrollbar; IE keeps overflowY = 'scroll'
}
div.textContent = element.value.substring(0, position);
// the second special handling for input type="text" vs textarea: spaces need to be replaced with non-breaking spaces - http://stackoverflow.com/a/13402035/1269037
if (element.nodeName === 'INPUT')
div.textContent = div.textContent.replace(/\s/g, "\u00a0");
var span = document.createElement('span');
// Wrapping must be replicated *exactly*, including when a long word gets
// onto the next line, with whitespace at the end of the line before (#7).
// The  *only* reliable way to do that is to copy the *entire* rest of the
// textarea's content into the <span> created at the caret position.
// for inputs, just '.' would be enough, but why bother?
span.textContent = element.value.substring(position) || '.';  // || because a completely empty faux span doesn't render at all
div.appendChild(span);
var coordinates = {
top: span.offsetTop + parseInt(computed['borderTopWidth']),
left: span.offsetLeft + parseInt(computed['borderLeftWidth'])
};
if (debug) {
span.style.backgroundColor = '#aaa';
} else {
document.body.removeChild(div);
}
return coordinates;
}
if (typeof module != "undefined" && typeof module.exports != "undefined") {
module.exports = getCaretCoordinates;
} else {
window.getCaretCoordinates = getCaretCoordinates;
}
}());
/***/ })
/******/ ])
});
;
POWERMODE.colorful = true; // 火花各种颜色
POWERMODE.shake = false; // 关闭打字屏幕颤抖效果
document.body.addEventListener('input', POWERMODE);
</script>
</html>

安装方法
本项目已发布到 npm 上,所以可用 npm 安装或者直接引入文件的方式使用。

安装方法1
使用 npm 安装:

npm install html-activate-power-mode -S
导入:

// import
import POWERMODE from 'html-activate-power-mode'

直接引入文件的方式两种方法根据实际情况2选1即可。

-使用方法
直接监听页面的 input 事件即可,插件会自动为支持的输入框类型添加输入特效。

-选项
POWERMODE.colorful = true // 打开粒子动画,默认开启
POWERMODE.shake = true // 开启震动效果, 默认关闭
POWERMODE.shakeSize = 5 // 设置震动幅度, 默认 1.5

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