Created
May 20, 2012 22:22
-
-
Save kaaes/2759748 to your computer and use it in GitHub Desktop.
Function to delegate events. Can be used with any css selector
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| function delegate(element, eventType, selector, callback, bubble) { | |
| var selectorObj = getSelectorType(selector); | |
| var callbackFn; | |
| selector = selectorObj.value; | |
| switch (selectorObj.type) { | |
| case 'tag': | |
| callbackFn = tagSelector; | |
| break; | |
| case 'class': | |
| callbackFn = classSelector; | |
| break; | |
| default: | |
| callbackFn = anySelector; | |
| break; | |
| } | |
| function getSelectorType(selector) { | |
| selector = selector.replace(/^\s\s*/, '').replace(/\s\s*$/, ''); | |
| if (/^[a-z]+$/i.test(selector)) { | |
| return { | |
| type: 'tag', | |
| value: selector | |
| }; | |
| } else if (/^\.[a-z]+$/.test(selector)) { | |
| return { | |
| type: 'class', | |
| value: selector.replace('.', '') | |
| }; | |
| } else { | |
| return { | |
| type: 'other', | |
| value: selector | |
| } | |
| } | |
| } | |
| function tagSelector(evt) { | |
| var el = evt.target; | |
| while (el !== evt.currentTarget) { | |
| if (el.nodeName.toLowerCase() === selector) { | |
| callback.call(el, evt); | |
| return; | |
| } else { | |
| el = el.parentNode; | |
| } | |
| } | |
| } | |
| function classSelector(evt) { | |
| var el = evt.target; | |
| while (el !== evt.currentTarget) { | |
| if (el.classList.contains(selector)) { | |
| callback.call(el, evt); | |
| return; | |
| } else { | |
| el = el.parentNode; | |
| } | |
| } | |
| } | |
| function anySelector(evt) { | |
| var el = evt.target; | |
| var currentEl; | |
| var targets = element.querySelectorAll(selector); | |
| while (el !== evt.currentTarget) { | |
| currentEl = elementInList(targets, el); | |
| if (currentEl) { | |
| callback.call(currentEl, evt); | |
| return; | |
| } else { | |
| el = el.parentNode; | |
| } | |
| } | |
| } | |
| function elementInList(list, element) { | |
| for (var i = 0, l = list.length; i < l; i++) { | |
| if (element === list[i]) { | |
| return list[i]; | |
| } | |
| } | |
| return false; | |
| } | |
| element.addEventListener(eventType, callbackFn, typeof bubble === undefined ? false : bubble); | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment