Cross-browser function to handle DOM events.
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March 27, 2016 18:19
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Cross-browser eventHandler function done with 270 bytes of JavaScript
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| <!doctype html> | |
| <title>Demo</title> | |
| <span id="btn">Button</span> | |
| <script> | |
| // eventHandler | |
| var eventHandler = function(c,b,a,d,e,f){e=(f="on"==c)?"addEventListener":"removeEventListener";try{a[e](b,d,!1)}catch(g){try{a[f?"attachEvent":"detachEvent"]("on"+b,d)}catch(h){a=document,a.createEvent?(a=new Event(c),b.dispatchEvent(a)):(a=a.createEventObject(),b.fireEvent("on"+c,a))}}}; | |
| // DOM element | |
| var element = document.getElementById('btn'); | |
| // callback function | |
| var callback = function () { alert('Button clicked!'); }; | |
| // alert 'Button clicked!' when clicked | |
| eventHandler('on', 'click', element, callback); | |
| // trigger the 'click' event | |
| eventHandler('click', element); | |
| // remove the 'click' event | |
| eventHandler('off', 'click', element, callback); | |
| </script> |
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| /** | |
| * @param action 'on', 'off' or Event type (i.e. 'click') | |
| * @param type Event type (i.e. 'click') or DOM Element or other EventTarget | |
| * @param target DOM Element to add/remove the event | |
| * @param callback Function to add/remove to the target | |
| */ | |
| function (action, type, target, callback, method, ison) { | |
| ison = action == 'on'; | |
| method = ison ? 'addEventListener' : 'removeEventListener'; | |
| try { | |
| target[method](type, callback, false); | |
| } catch (e) { | |
| try { | |
| method = ison ? 'attachEvent' : 'detachEvent'; | |
| target[method]('on' + type, callback); | |
| } catch (e) { | |
| target = document; | |
| if (target.createEvent) { | |
| target = new Event(action); | |
| type.dispatchEvent(target); | |
| } else { | |
| target = target.createEventObject(); | |
| type.fireEvent('on' + action, target); | |
| } | |
| } | |
| } | |
| }; |
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| function(c,b,a,d,e,f){e=(f="on"==c)?"addEventListener":"removeEventListener";try{a[e](b,d,!1)}catch(g){try{a[f?"attachEvent":"detachEvent"]("on"+b,d)}catch(h){a=document,a.createEvent?(a=new Event(c),b.dispatchEvent(a)):(a=a.createEventObject(),b.fireEvent("on"+c,a))}}} |
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I inherently dislike using try/catch for every event. can't you just check if 'addEventListener' is in document?