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JS Event (4)--cross-browser event object

Source: Internet
Author: User
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Cross-browser event objects in a detailed

Encapsulating Event Objects

1 varEvent_util = {2     //Add Event3AddHandler:function(element, type, handler) {4         if(element.addeventlistener) {5Element.addeventlistener (type, Handler,false); 6}Else if(element.attachevent) {7Element.attachevent ("on" +type, handler);8}Else {9Element["on" + type] =handler; Ten         } One     }, A     //Removing events -RemoveHandler:function(element, type, handler) { -         if(element.removeeventlistener) { theElement.removeeventlistener (type, Handler,false); -}Else if(element.detachevent) { -Element.detachevent ("on" +type, handler); -}Else { +Element["on" + type] =NULL; -         } +     }, A     //Get Event Object atGetEvent:function(event) { -         returnEvent?event:window.event; -     }, -     //Get Event Destination -Gettarget:function(event) { -         returnEvent.target | |event.srcelement; in     }, -     //Block Event bubbling toStoppropagation:function(event) { +         if(event.stoppropagation) { - event.stoppropagation (); the}Else { *Event.cancelbubble =true; $         }Panax Notoginseng     }, -     //Cancel Event default behavior thePreventdefault:function(event) { +         if(event.preventdefault) { A Event.preventdefault (); the}Else { +Event.returnvalue =false; -         } $     } $};
View Code

Save the Event_util object to an "event object. js" file for easy invocation.

HTML code

  1  <! DOCTYPE html>  3  < Head> <meta charset=" utf-8 "> 5 <title> Event Object Example </title>  7  <body> 8  <div id= "box" > 9  <input type= "button" id= "BTN" value= "button" >10  <a href= "http://www.baidu.com" id= "link" > Baidu </a>11  </div> ; 12  <script src= "event object. js" ></script> 13  </body>14

Detecting Event Types

1 var btn = document.getElementById ("btn"); 2 function (event) {3     event = event_util.getevent (event); 4     alert (event.type);    // "click" 5 });

Detecting event targets

1 var btn = document.getElementById ("btn"); 2 function (event) {3     alert (Event_util.gettarget (event));    // Object Htmlinputelement 4 });

Block event bubbling

1 varBTN = document.getElementById ("btn");2 vardiv = document.getElementById ("box");3Event_util.addhandler (BTN, "click",function(event) {4Alert ("You ' ve clicked the button."));5event =event_util.getevent (event);6 event_util.stoppropagation (event);7 });8Event_util.addhandler (Div, "click",function() {9Alert ("You ' ve clicked the Div."));Ten});

Cancel event default behavior

1 var link = document.getElementById ("link"); 2 function (event) {3     alert ("This link will not jump! "); 4     event = Event_util.getevent (event); 5     Event_util.preventdefault (event); 6 });

Note: When dealing with an event object, remember to pass in the event parameter, and once you pass in the event parameter, remember to call Event_util.getevent ().

JS Event (4)--cross-browser event object

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