56 lines
1.2 KiB
JavaScript
56 lines
1.2 KiB
JavaScript
var React = require('react');
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module.exports = {
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isInViewport: function() {
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var el = React.findDOMNode(this);
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if(!el) return false;
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var rect = el.getBoundingClientRect();
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return (
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rect.top >= 0 &&
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rect.left >= 0 &&
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rect.bottom <= (global.window.innerHeight || global.document.documentElement.clientHeight) && /*or $(window).height() */
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rect.right <= (global.window.innerWidth || global.document.documentElement.clientWidth) /*or $(window).width() */
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);
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},
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componentDidMount: function() {
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function _onInViewport(){
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if( this.isInViewport() ) {
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this.onInViewport();
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}
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}
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var el = React.findDOMNode(this);
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if(typeof this.onInViewport === 'function') {
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window.document.addEventListener('scroll', debounce(_onInViewport.bind(this), 250), true);
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}
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_onInViewport.call(this);
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}
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};
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function debounce(func, wait, immediate) {
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var timeout;
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return function() {
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var context = this, args = arguments;
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var later = function() {
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timeout = null;
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if (!immediate) func.apply(context, args);
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};
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var callNow = immediate && !timeout;
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clearTimeout(timeout);
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timeout = setTimeout(later, wait);
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if (callNow) func.apply(context, args);
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};
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}
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