react-preload-image
Version:
Preload and fade in an image. Optional support for lazy loading.
212 lines (182 loc) • 7.96 kB
JavaScript
/*!
* react-preload-image v1.0.6
* MIT Licensed
*/
(function webpackUniversalModuleDefinition(root, factory) {
if(typeof exports === 'object' && typeof module === 'object')
module.exports = factory(require("react"));
else if(typeof define === 'function' && define.amd)
define(["react"], factory);
else if(typeof exports === 'object')
exports["ReactPreloadImage"] = factory(require("react"));
else
root["ReactPreloadImage"] = factory(root["React"]);
})(typeof self !== 'undefined' ? self : this, function(__WEBPACK_EXTERNAL_MODULE_2__) {
return /******/ (function(modules) { // webpackBootstrap
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/* 0 */
/***/ (function(module, exports, __webpack_require__) {
module.exports = __webpack_require__(1);
/***/ }),
/* 1 */
/***/ (function(module, __webpack_exports__, __webpack_require__) {
"use strict";
Object.defineProperty(__webpack_exports__, "__esModule", { value: true });
/* harmony import */ var __WEBPACK_IMPORTED_MODULE_0_react__ = __webpack_require__(2);
/* harmony import */ var __WEBPACK_IMPORTED_MODULE_0_react___default = __webpack_require__.n(__WEBPACK_IMPORTED_MODULE_0_react__);
var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }
var PreloadImage = function (_React$Component) {
_inherits(PreloadImage, _React$Component);
function PreloadImage(props) {
_classCallCheck(this, PreloadImage);
var _this = _possibleConstructorReturn(this, _React$Component.call(this, props));
_this.state = {
loaded: false,
src: null
};
return _this;
}
PreloadImage.prototype.componentDidMount = function componentDidMount() {
if (this.props.lazy && 'IntersectionObserver' in window) {
this.setObserver();
} else {
this.setPreloader();
}
};
PreloadImage.prototype.setObserver = function setObserver() {
var _this2 = this;
this.observer = new IntersectionObserver(function (entries) {
entries.forEach(function (entry) {
if (entry.isIntersecting) {
_this2.setPreloader();
_this2.observer.disconnect();
}
});
});
this.observer.observe(this.el);
};
PreloadImage.prototype.setPreloader = function setPreloader() {
var _this3 = this;
this.preloader = new Image();
this.preloader.onload = function () {
return _this3.setState({
loaded: true,
src: 'url(' + _this3.props.src + ')'
});
};
this.preloader.src = this.props.src;
};
PreloadImage.prototype.componentWillUnmount = function componentWillUnmount() {
if (this.observer) this.observer.disconnect();
if (this.preloader) this.preloader.onload = null;
};
PreloadImage.prototype.render = function render() {
var _this4 = this;
var backgroundSize = this.props.innerStyle && this.props.innerStyle.backgroundSize ? this.props.innerStyle.backgroundSize : "cover";
var backgroundPosition = this.props.innerStyle && this.props.innerStyle.backgroundPosition ? this.props.innerStyle.backgroundPosition : "center";
var backgroundRepeat = this.props.innerStyle && this.props.innerStyle.backgroundRepeat ? this.props.innerStyle.backgroundRepeat : "no-repeat";
return __WEBPACK_IMPORTED_MODULE_0_react___default.a.createElement(
'div',
{
// Required: Relative, absolute, or fixed position
// Required: Width & height (explicitly or via top/right/bottom/left)
// Optional: Background color or placeholder image
className: this.props.className,
style: _extends({}, this.props.style),
ref: function ref(el) {
return _this4.el = el;
}
},
__WEBPACK_IMPORTED_MODULE_0_react___default.a.createElement('div', { style: {
position: 'absolute',
top: 0,
right: 0,
bottom: 0,
left: 0,
backgroundImage: this.state.src,
backgroundSize: backgroundSize,
backgroundPosition: backgroundPosition,
backgroundRepeat: backgroundRepeat,
transition: 'opacity ' + (this.props.duration || '300ms') + ' ' + (this.props.ease || 'cubic-bezier(0.215, 0.61, 0.355, 1)'),
opacity: this.state.loaded ? 1 : 0
} }),
this.props.children
);
};
return PreloadImage;
}(__WEBPACK_IMPORTED_MODULE_0_react___default.a.Component);
/* harmony default export */ __webpack_exports__["default"] = (PreloadImage);
/***/ }),
/* 2 */
/***/ (function(module, exports) {
module.exports = __WEBPACK_EXTERNAL_MODULE_2__;
/***/ })
/******/ ])["default"];
});