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| var dispatchErrorEvent = (function IIFE(){ | |
| var createErrorEvent; | |
| try { | |
| try { | |
| new ErrorEvent("error",{}); | |
| createErrorEvent = function createErrorEvent(err) { | |
| return new ErrorEvent("error",{ | |
| error: err, | |
| message: err.message || "general error event" | |
| }); | |
| }; | |
| return dispatchError; | |
| } | |
| catch(err){} | |
| var x = document.createEvent("Event"); | |
| x.initEvent("error",false,false); | |
| createErrorEvent = function createErrorEvent(err) { | |
| var e = document.createEvent("Event"); | |
| e.initEvent("error",false,false); | |
| e.message = err.message || "general error event"; | |
| return e; | |
| }; | |
| return dispatchError; | |
| } | |
| catch(err) {} | |
| return Function.prototype; // no-op | |
| function dispatchError(err) { | |
| window.dispatchEvent(createErrorEvent(err)); | |
| } | |
| })(); |
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| function logMsgs() { | |
| var args = [].slice.call(arguments); | |
| var elem = document.getElementById("messages"); | |
| elem.innerHTML += "<p>" + args.join(" ; ") + "</p>"; | |
| } | |
| window.onerror = function(err){ | |
| logMsgs("onerror",err.message || err); | |
| return true; | |
| }; | |
| window.addEventListener("error",function(evt){ | |
| logMsgs("addEL-1",evt.type,evt.message); | |
| }); | |
| window.addEventListener("error",function(evt){ | |
| logMsgs("addEL-2",evt.type,evt.message); | |
| }); |
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| function foo() { | |
| throw new Error("...from foo"); | |
| } | |
| function bar() { | |
| doesntexist1(); | |
| } | |
| document.getElementById("clickme").addEventListener("click",bar,false); | |
| setTimeout(function(){ | |
| throw new Error("...from settimeout"); | |
| },1000); | |
| dispatchErrorEvent(new Error("...from dispatched event")); |
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| foo(); | |
| // note: shouldn't get here | |
| doesntexist2(); |
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| <!DOCTYPE html> | |
| <html> | |
| <meta charset="utf-8"> | |
| <title>Creating, dispatching, and catching error events</title> | |
| <body> | |
| <h1>Creating, dispatching, and catching error events</h1> | |
| <button id="clickme">click me</button> | |
| <div id="messages"></div> | |
| <script src="dispatch-error-event.js"></script> | |
| <script src="test-error-1.js"></script> | |
| <script src="test-error-2.js"></script> | |
| <script src="test-error-3.js"></script> | |
| </body> | |
| </html> |
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