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53 lines
1.6 KiB
JavaScript
53 lines
1.6 KiB
JavaScript
7 years ago
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/*global NodeList */
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(function (window) {
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'use strict';
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// Get element(s) by CSS selector:
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window.qs = function (selector, scope) {
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return (scope || document).querySelector(selector);
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};
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window.qsa = function (selector, scope) {
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return (scope || document).querySelectorAll(selector);
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};
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// addEventListener wrapper:
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window.$on = function (target, type, callback, useCapture) {
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target.addEventListener(type, callback, !!useCapture);
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};
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// Attach a handler to event for all elements that match the selector,
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// now or in the future, based on a root element
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window.$delegate = function (target, selector, type, handler) {
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function dispatchEvent(event) {
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var targetElement = event.target;
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var potentialElements = window.qsa(selector, target);
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var hasMatch = Array.prototype.indexOf.call(potentialElements, targetElement) >= 0;
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if (hasMatch) {
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handler.call(targetElement, event);
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}
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}
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// https://developer.mozilla.org/en-US/docs/Web/Events/blur
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var useCapture = type === 'blur' || type === 'focus';
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window.$on(target, type, dispatchEvent, useCapture);
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};
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// Find the element's parent with the given tag name:
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// $parent(qs('a'), 'div');
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window.$parent = function (element, tagName) {
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if (!element.parentNode) {
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return;
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}
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if (element.parentNode.tagName.toLowerCase() === tagName.toLowerCase()) {
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return element.parentNode;
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}
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return window.$parent(element.parentNode, tagName);
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};
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// Allow for looping on nodes by chaining:
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// qsa('.foo').forEach(function () {})
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NodeList.prototype.forEach = Array.prototype.forEach;
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})(window);
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