ʲôÊÇʼþ£¿
ʼþ(Event)ÊÇJavaScriptÓ¦ÓÃÌø¶¯µÄÐÄÔà £¬Ò²ÊǰÑËùÓж«Î÷Õ³ÔÚÒ»ÆðµÄ½ºË®¡£µ±ÎÒÃÇÓëä¯ÀÀÆ÷ÖÐ
Web Ò³Ãæ½øÐÐijЩÀàÐ͵Ľ»»¥Ê±£¬Ê¼þ¾Í·¢ÉúÁË¡£Ê¼þ¿ÉÄÜÊÇÓû§ÔÚijЩÄÚÈÝÉϵĵã»÷¡¢Êó±ê¾¹ýij¸öÌØ¶¨ÔªËØ»ò°´Ï¼üÅÌÉϵÄijЩ°´¼ü¡£Ê¼þ»¹¿ÉÄÜÊÇ
Web ä¯ÀÀÆ÷Öз¢ÉúµÄÊÂÇ飬±ÈÈç˵ij¸öWeb Ò³Ãæ¼ÓÔØÍê³É£¬»òÕßÊÇÓû§¹ö¶¯´°¿Ú»ò¸Ä±ä´°¿Ú´óС¡£
ͨ¹ýʹÓà JavaScript £¬Äã¿ÉÒÔ¼àÌýÌØ¶¨Ê¼þµÄ·¢Éú£¬²¢¹æ¶¨ÈÃijЩʼþ·¢ÉúÒÔ¶ÔÕâЩʼþ×ö³öÏìÓ¦¡£
½ñÌìµÄʼþ
ÔÚÂþ³¤µÄÑݱäÊ·£¬ÎÒÃÇÒѾ¸æ±ðÁËÄÚǶʽµÄʼþ´¦Àí·½Ê½£¨Ö±½Ó½«Ê¼þ´¦ÀíÆ÷·ÅÔÚ
HTML ÔªËØÖ®ÄÚÀ´Ê¹Óã©¡£½ñÌìµÄʼþ£¬ËüÒÑÊÇDOMµÄÖØÒª×é³É²¿·Ö£¬Òź¶µÄÊÇ£¬ IE¼ÌÐø±£ÁôËü×îÔçÔÚIE4.0ÖÐʵÏÖµÄʼþÄ£ÐÍ£¬ÒÔºóµÄIE°æ±¾ÖÐҲûÓÐ×öÌ«´óµÄ¸Ä±ä£¬ÕâÒ²¾ÍÊÇ˵IE»¹ÊÇʹÓõÄÊÇÒ»ÖÖרÓеÄʼþÄ£ÐÍ£¨Ã°ÅÝÐÍ£©,¶øÆäËüµÄÖ÷Á÷ä¯ÀÀÆ÷Ö±µ½DOM
¼¶±ð 3 ¹æ¶¨¶¨°¸ºó£¬²ÅÂ½Â½ÐøÐøÖ§³ÖDOM±ê×¼µÄʼþ´¦ÀíÄ£ÐÍ ¡ª ²¶»ñÐÍÓëðÅÝÐÍ¡£
ÀúÊ·ÔÒòÊÇ£ºW3C ¹æ·¶ ÔÚDOM ¼¶±ð 1Öв¢Ã»Óж¨ÒåÈκεÄʼþ£¬Ö±µ½·¢²¼ÓÚ
2000 Äê 11 Ô µÄDOM ¼¶±ð 2 ²Å¶¨ÒåÁËһС²¿·Ö×Ó¼¯£¬DOM ¼¶±ð 2ÖÐÒѾÌṩÁËÌṩÁËÒ»ÖÖ¸üÏêϸµÄ¸üϸÖµķ½Ê½ÒÔ¿ØÖÆ
Web Ò³ÃæÖеÄʼþ£¬×îºó£¬ÍêÕûµÄʼþÊÇÔÚ2004Äê DOM ¼¶±ð 3µÄ¹æ¶¨ÖвÅ×îÖÕ¶¨°¸¡£ÒòΪIE4ÊÇ1995ÍÆ³öµÄ²¢ÒÑʵÏÖÁË×Ô¼ºµÄʼþÄ£ÐÍ£¨Ã°ÅÝÐÍ£©£¬µ±Ê±¸ù±¾¾ÍûÓÐDOM±ê×¼£¬²»¹ýÔÚÒÔºóµÄDOM±ê×¼¹æ·¶¹ý³ÌÖÐÒѾ°ÑIEµÄʼþÄ£ÐÍÎüÊÕµ½ÁËÆäÖС£
Ŀǰ³ýIEä¯ÀÀÆ÷Í⣬ÆäËüÖ÷Á÷µÄFirefox, Opera,Safari¶¼Ö§³Ö±ê×¼µÄDOMʼþ´¦ÀíÄ£ÐÍ¡£IEÈÔȻʹÓÃ×Ô¼º×¨ÓеÄʼþÄ£ÐÍ£¬¼´Ã°ÅÝÐÍ£¬ËüʼþÄ£Ð͵ÄÒ»²¿·Ý±»DOM±ê×¼²ÉÓã¬Õâµã¶ÔÓÚ¿ª·¢ÕßÀ´ËµÒ²ÊÇÓкô¦µÄ£¬Ö»ÓÐʹÓÃDOM±ê×¼£¬IE¶¼¹²ÓеÄʼþ´¦Àí·½Ê½²ÅÄÜÓÐЧµÄ¿çä¯ÀÀÆ÷¡£
DOMʼþÁ÷
DOM(Îĵµ¶ÔÏóÄ£ÐÍ)½á¹¹ÊÇÒ»¸öÊ÷Ðͽṹ£¬µ±Ò»¸öHTMLÔªËØ²úÉúÒ»¸öʼþʱ£¬¸Ãʼþ»áÔÚÔªËØ½áµãÓë¸ù½ÚµãÖ®¼ä°´Ìض¨µÄ˳Ðò´«²¥£¬Â·¾¶Ëù¾¹ýµÄ½Úµã¶¼»áÊÕµ½¸Ãʼþ£¬Õâ¸ö´«²¥¹ý³Ì¿É³ÆÎªDOMʼþÁ÷¡£
ʼþ˳ÐòÓÐÁ½ÖÖÀàÐÍ£ºÊ¼þ²¶×½ºÍʼþðÅÝ¡£
1¡¢Ã°ÅÝÐÍʼþ(Event Bubbling)
ÕâÊÇIEä¯ÀÀÆ÷¶ÔʼþÄ£Ð͵ÄʵÏÖ£¬Ò²ÊÇ×îÈÝÒ×Àí½âµÄ£¬ÖÁÉÙ±ÊÕß¾õµÃ±È½Ï·ûºÏʵ¼ÊµÄ¡£Ã°ÅÝ£¬¹ËÃû˼Ò壬ʼþÏñ¸öË®ÖÐµÄÆøÅÝÒ»ÑùÒ»Ö±ÍùÉÏð£¬Ö±µ½¶¥¶Ë¡£´ÓDOMÊ÷ÐͽṹÉÏÀí½â£¬¾ÍÊÇʼþÓÉÒ¶×Ó½ÚµãÑØ×æÏȽáµãÒ»Ö±ÏòÉÏ´«µÝÖ±µ½¸ù½Úµã£»´Óä¯ÀÀÆ÷½çÃæÊÓͼHTMLÔªËØÅÅÁвã´ÎÉÏÀí½â¾ÍÊÇʼþÓɾßÓдÓÊô¹ØÏµµÄ×îÈ·¶¨µÄÄ¿±êÔªËØÒ»Ö±´«µÝµ½×ȷ¶¨µÄÄ¿±êÔªËØ.ðÅݼ¼Êõ.ðÅÝÐÍʼþµÄ»ù±¾Ë¼Ïë,ʼþ°´ÕÕ´ÓÌØ¶¨µÄʼþÄ¿±ê¿ªÊ¼µ½×ȷ¶¨µÄʼþÄ¿±ê.
2¡¢²¶»ñÐÍʼþ(Event Capturing)
Netscape µÄʵÏÖ£¬ËüÓëðÅÝÐ͸պÃÏà·´£¬ÓÉDOMÊ÷×î¶¥²ãÔªËØÒ»Ö±µ½×ȷµÄÔªËØ£¬Õâ¸öʼþÄ£ÐͶÔÓÚ¿ª·¢ÕßÀ´Ëµ£¨ÖÁÉÙÊÇÎÒ..£©Óеã·Ñ½â£¬ÒòΪֱ¹ÛÉϵÄÀí½âÓ¦¸ÃÈçͬðÅÝÐÍ£¬Ê¼þ´«µÝÓ¦¸ÃÓÉ×îÈ·¶¨µÄÔªËØ£¬¼´Ê¼þ²úÉúÔªËØ¿ªÊ¼¡£

DOM±ê×¼µÄʼþÄ£ÐÍ
ÎÒÃÇÒѾ¶ÔÉÏÃæÁ½¸ö²»Í¬µÄʼþÄ£ÐͽøÐÐÁ˽âÊͺͶԱȡ£DOM±ê׼ͬʱ֧³ÖÁ½ÖÖʼþÄ£ÐÍ£¬¼´²¶»ñÐÍʼþÓëðÅÝÐÍʼþ£¬µ«ÊÇ£¬²¶»ñÐÍʼþÏÈ·¢Éú¡£Á½ÖÖʼþÁ÷¶¼»á´¥·¢DOMÖеÄËùÓжÔÏ󣬴Ódocument¶ÔÏó¿ªÊ¼£¬Ò²ÔÚdocument¶ÔÏó½áÊø£¨´ó²¿·Ö¼æÈݱê×¼µÄä¯ÀÀÆ÷»á¼ÌÐø½«Ê¼þÊDz¶×½/ðÅÝÑÓÐøµ½window¶ÔÏ󣩡£

Èçͼ£ºÊ×ÏÈÊDz¶»ñʽ´«µÝʼþ£¬½Ó×ÅÊÇðÅÝʽ´«µÝ£¬ËùÒÔ£¬Èç¹ûÒ»¸ö´¦Àíº¯Êý¼È×¢²áÁ˲¶»ñÐÍʼþµÄ¼àÌý£¬ÓÖ×¢²áðÅÝÐÍʼþ¼àÌý£¬ÄÇôÔÚDOMʼþÄ£ÐÍÖÐËü¾Í»á±»µ÷ÓÃÁ½´Î¡£
DOM±ê×¼µÄʼþÄ£ÐÍ×î¶ÀÌØµÄÐÔÖÊÊÇ,Îı¾½ÚµãÒ²»á´¥·¢Ê¼þ(ÔÚIE²»»á)¡£

ʼþ´«ËÍ
ΪÁ˸üºÃµÄ˵Ã÷DOM±ê×¼ÖеÄʼþÁ÷ÔÀí£¬ÎÒÃǰÑËü·ÅÔÚ¡°Ê¼þ´«ËÍ¡±Ð¡½áÀïÀ´¸ü¾ßÌåµÄ½âÊÍ¡£
ÏÔÈ»£¬Èç¹ûΪһ¸ö³¬Á´½ÓÌí¼ÓÁËclickʼþ¼àÌýÆ÷£¬ÄÇôµ±¸ÃÁ´½Ó±»µã»÷ʱ¸Ãʼþ¼àÌýÆ÷¾Í»á±»Ö´ÐС£µ«Èç¹û°Ñ¸Ãʼþ¼àÌýÆ÷Ö¸ÅɸøÁ˰üº¬¸ÃÁ´½ÓµÄpÔªËØ»òÕßλÓÚDOMÊ÷¶¥¶ËµÄdocument½Úµã£¬ÄÇôµã»÷¸ÃÁ´½ÓҲͬÑù»á´¥·¢¸Ãʼþ¼àÌýÆ÷¡£ÕâÊÇÒòΪʼþ²»½ö½ö¶Ô´¥·¢µÄÄ¿±êÔªËØ²úÉúÓ°Ï죬ËüÃÇ»¹»á¶ÔÑØ×ÅDOM½á¹¹µÄËùÓÐÔªËØ²úÉúÓ°Ïì¡£Õâ¾ÍÊÇ´ó¼ÒËùÊìϤµÄʼþתËÍ¡£
W3CʼþÄ£ÐÍÖÐÃ÷È·µØÖ¸³öÁËʼþתË͵ÄÔÀí¡£Ê¼þ´«ËÍ¿ÉÒÔ·ÖΪ3¸ö½×¶Î¡£

Èçͼ£º±ê×¼µÄʼþתËÍģʽ
£¨1£©.ÔÚʼþ²¶×½£¨Capturing£©½×¶Î£¬Ê¼þ½«ÑØ×ÅDOMÊ÷ÏòÏÂתËÍ£¬Ä¿±ê½ÚµãµÄÿһ¸ö׿ÏȽڵ㣬ֱÖÁÄ¿±ê½Úµã¡£ÀýÈ磬ÈôÓû§µ¥»÷ÁËÒ»¸ö³¬Á´½Ó£¬Ôò¸Ãµ¥»÷ʼþ½«´Ódocument½ÚµãתË͵½htmlÔªËØ£¬bodyÔªËØÒÔ¼°°üº¬¸ÃÁ´½ÓµÄpÔªËØ¡£
Ôڴ˹ý³ÌÖУ¬ä¯ÀÀÆ÷¶¼»á¼ì²âÕë¶Ô¸ÃʼþµÄ²¶×½Ê¼þ¼àÌýÆ÷£¬²¢ÇÒÔËÐÐÕâ¼þʼþ¼àÌýÆ÷¡£
(2). ÔÚÄ¿±ê£¨target£©½×¶Î£¬ä¯ÀÀÆ÷ÔÚ²éÕÒµ½ÒѾָ¶¨¸øÄ¿±êʼþµÄʼþ¼àÌýÆ÷Ö®ºó£¬¾Í»áÔËÐÐ
¸Ãʼþ¼àÌýÆ÷¡£Ä¿±ê½Úµã¾ÍÊÇ´¥·¢Ê¼þµÄDOM½Úµã¡£ÀýÈ磬Èç¹ûÓû§µ¥»÷Ò»¸ö³¬Á´½Ó£¬ÄÇô¸ÃÁ´½Ó¾ÍÊÇÄ¿±ê½Úµã£¨´ËʱµÄÄ¿±ê½Úµãʵ¼ÊÉÏÊdz¬Á´½ÓÄÚµÄÎı¾½Úµã£©¡£
£¨3£©.ÔÚðÅÝ£¨Bubbling£©½×¶Î£¬Ê¼þ½«ÑØ×ÅDOMÊ÷ÏòÉÏתËÍ£¬ÔÙ´ÎÖð¸ö·ÃÎÊÄ¿±êÔªËØµÄ׿ÏȽڵ㵽document½Úµã¡£¸Ã¹ý³ÌÖеÄÿһ²½¡£ä¯ÀÀÆ÷¶¼½«¼ì²âÄÇЩ²»ÊDz¶×½Ê¼þ¼àÌýÆ÷µÄʼþ¼àÌýÆ÷£¬²¢Ö´ÐÐËüÃÇ¡£
²¢·ÇËùÓеÄʼþ¶¼»á¾¹ýðÅݽ׶εģ¬ËùÓеÄʼþ¶¼Òª¾¹ý²¶×½½×¶ÎºÍÄ¿±ê½×¶Î£¬µ«ÊÇÓÐЩʼþ»áÌø¹ýðÅݽ׶Ρ£ÀýÈ磬ÈÃÔªËØ»ñµÃÊäÈë½¹µãµÄfocusʼþÒÔ¼°Ê§È¥ÊäÈë½¹µãµÄblurʼþ¾Í¶¼²»»áðÅÝ¡£
ʼþ¾ä±úºÍʼþ½ÓÌýÆ÷
ʼþ¾ä±ú
ʼþ¾ä±ú£¨ÓÖ³ÆÊ¼þ´¦Àíº¯Êý£¬DOM³ÆÖ®ÎªÊ¼þ¼àÌýº¯Êý£©£¬ÓÃÓÚÏìӦij¸öʼþ¶øµ÷Óõĺ¯Êý³ÆÎªÊ¼þ´¦Àíº¯Êý¡£Ã¿Ò»¸öʼþ¾ù¶ÔÓ¦Ò»¸öʼþ¾ä±ú£¬ÔÚ³ÌÐòÖ´ÐÐʱ£¬½«ÏàÓ¦µÄº¯Êý»òÓï¾äÖ¸¶¨¸øÊ¼þ¾ä±ú£¬ÔòÔÚ¸Ãʼþ·¢Éúʱ£¬ä¯ÀÀÆ÷±ãÖ´ÐÐÖ¸¶¨µÄº¯Êý»òÓï¾ä£¬´Ó¶øÊµÏÖÍøÒ³ÄÚÈÝÓëÓû§²Ù×÷µÄ½»»¥¡£µ±ä¯ÀÀÆ÷¼ì²âµ½Ä³Ê¼þ·¢Éúʱ£¬±ã²éÕÒ¸Ãʼþ¶ÔÓ¦µÄʼþ¾ä±úÓÐûÓб»¸³Öµ£¬Èç¹ûÓУ¬ÔòÖ´ÐиÃʼþ¾ä±ú¡£
ÎÒÃÇÈÏΪÏìÓ¦µã»÷ʼþµÄº¯ÊýÊÇonclickʼþ´¦Àíº¯Êý¡£ÒÔǰ£¬Ê¼þ´¦Àíº¯ÊýÓÐÁ½ÖÖ·ÖÅ䷽ʽ£ºÔÚJavaScriptÖлòÕßÔÚHTMLÖС£
Èç¹ûÔÚJavaScript ÖзÖÅäʼþ´¦Àíº¯Êý£¬ ÔòÐèÒªÊ×ÏÈ»ñµÃÒª´¦ÀíµÄ¶ÔÏóµÄÒ»ÒýÓã¬È»ºó½«º¯Êý¸³Öµ¸ø¶ÔÓ¦µÄʼþ´¦Àíº¯ÊýÊôÐÔ£¬Çë¿´Ò»¸ö¼òµ¥µÄÀý×Ó£º
var link=document.getElementById("mylink"); 2 link.onclick=function(){ 3 alert("I was clicked !"); 4 }; |
´ÓÎÒÃÇ¿´µ½µÄÀý×ÓÖУ¬ÎÒÃÇ·¢ÏÖʹÓÃʼþ¾ä±úºÜÈÝÒ×£¬²»¹ýʼþ´¦Àíº¯ÊýÃû³Æ±ØÐëÊÇСдµÄ£¬»¹ÓоÍÊÇÖ»ÓÐÔÚÔªËØÔØÈëÍê³ÉÖ®ºó²ÅÄܽ«Ê¼þ¾ä±ú¸³¸øÔªËØ£¬²»È»»áÓÐÒì³£¡£
¹ØÓÚÎĵµÔØÈë¼¼Êõ£¬Çë¿´¡¶window.onload¼ÓÔØµÄ¶àÖÖ½â¾ö·½°¸¡·
µÄÎÄÕ¡£
Èç¹ûÔÚHTMLÖзÖÅäʼþ¾ä±úµÄ»°£¬ÔòÖ±½Óͨ¹ýHTMLÊôÐÔÀ´ÉèÖÃʼþ´¦Àíº¯Êý¾ÍÐÐÁË£¬²¢ÔÚÆäÖаüº¬ºÏÊʵĽű¾×÷ÎªÌØÐÔÖµ¾Í¿ÉÒÔÁË£¬ÀýÈ磺
<a href="/" onclick="JavaScript code here">......</a> |
ÕâÖÖJavaScript ´úÂëºÍͨ¹ýHTMLµÄstyleÊôÐÔÖ±½Ó½«CSSÊôÐÔ¸³¸øÔªËØÀàËÆ¡£ÕâÑù»á´úÂë¿´ÆðÀ´Ò»ÍÅÔ㣬ҲΥ±³Á˽«ÊµÏÖ¶¯Ì¬ÐÐΪµÄ´úÂëÓëÏÔʾÎĵµ¾²Ì¬ÄÚÈݵĴúÂëÏà·ÖÀëµÄÔÔò¡£´Ó1998Ä꿪ʼ£¬ÕâÖÖд·¨¾Í¹ýʱÁË¡£
ÕâÖÖ´«Í³µÄʼþ°ó¶¨¼¼Êõ£¬ÓÅȱµãÊÇÏÔÈ»µÄ£º
1.¼òµ¥·½±ã£¬ÔÚHTMLÖÐÖ±½ÓÊéд´¦Àíº¯ÊýµÄ´úÂë¿é£¬ÔÚJSÖиøÔªËضÔӦʼþÊôÐÔ¸³Öµ¼´¿É¡£
2.IEÓëDOM±ê×¼¶¼Ö§³ÖµÄÒ»ÖÖ·½·¨£¬ËüÔÚIEÓëDOM±ê×¼Öж¼ÊÇÔÚʼþðÅݹý³ÌÖб»µ÷Óõġ£
3.¿ÉÒÔÔÚ´¦Àíº¯Êý¿éÄÚÖ±½ÓÓÃthisÒýÓÃ×¢²áʼþµÄÔªËØ£¬thisÒýÓõÄÊǵ±Ç°ÔªËØ¡£
4.Òª¸øÔªËØ×¢²á¶à¸ö¼àÌýÆ÷£¬¾Í²»ÄÜÓÃÕâ·½·¨ÁË¡£
ʼþ½ÓÌýÆ÷
³ýÁËÇ°ÃæÒѾ½éÉܵļòµ¥Ê¼þ¾ä±úÖ®Í⣬ÏÖÔÚ´ó¶àÊýä¯ÀÀÆ÷¶¼ÄÚÖÃÁËһЩ¸ü¸ß¼¶µÄʼþ´¦Àí·½Ê½£¬¼´£¬Ê¼þ¼àÌýÆ÷£¬ÕâÖÖ´¦Àí·½Ê½¾Í²»ÊÜÒ»¸öÔªËØÖ»Äܰó¶¨Ò»¸öʼþ¾ä±úµÄÏÞÖÆ¡£
ÎÒÃÇÒѾ֪µÀÁËʼþ¾ä±úÓëʼþ¼àÌýÆ÷µÄ×î´ó²»Í¬Ö®´¦ÊÇʹÓÃʼþ¾ä±úʱһ´ÎÖ»Äܲå½ÓÒ»¸öʼþ¾ä±ú£¬µ«¶ÔÓÚʼþ¼àÌýÆ÷£¬Ò»´Î¿ÉÒÔ²å½Ó¶à¸ö¡£
IEϵÄʼþ¼àÌýÆ÷£º
IEÌṩµÄÈ´ÊÇÒ»ÖÖ×ÔÓеģ¬ÍêÈ«²»Í¬µÄÉõÖÁ´æÔÚBUGµÄʼþ¼àÌýÆ÷£¬Òò´ËÈç¹ûÒªÈýű¾ÔÚ±¾ä¯ÀÀÆ÷ÖÐÕý³£ÔËÐеϰ£¬¾Í±ØÐëʹÓÃIEËùÖ§³ÖµÄʼþ¼àÌýÆ÷¡£ÁíÍ⣬Safari
ä¯ÀÀÆ÷ÖеÄʼþ¼àÌýÆ÷ÓÐʱҲ´æÔÚÒ»µã²»Í¬¡£
ÔÚIEÖУ¬Ã¿¸öÔªËØºÍwindow¶ÔÏó¶¼ÓÐÁ½¸ö·½·¨£ºattachEvent·½·¨ºÍdetachEvent·½·¨¡£
element.attachEvent("onevent",eventListener); |
´Ë·½·¨µÄÒâ˼ÊÇÔÚIEÖÐÒªÏë¸øÒ»¸öÔªËØµÄʼþ¸½¼Óʼþ´¦Àíº¯Êý£¬±ØÐëµ÷ÓÃattachEvent·½·¨²ÅÄÜ´´½¨Ò»¸öʼþ¼àÌýÆ÷¡£attachEvent·½·¨ÔÊÐíÍâ½ç×¢²á¸ÃÔªËØ¶à¸öʼþ¼àÌýÆ÷¡£
attachEvent½ÓÊÜÁ½¸ö²ÎÊý¡£µÚÒ»¸ö²ÎÊýÊÇʼþÀàÐÍÃû£¬µÚ¶þ¸ö²ÎÊýeventListenerÊǻص÷´¦Àíº¯Êý¡£ÕâÀïµÃ˵Ã÷һϣ¬Óиö¾³£»á³ö´íµÄµØ·½£¬IEÏÂ
ÀûÓÃattachEvent×¢²áµÄ´¦Àíº¯Êýµ÷ÓÃʱthisÖ¸Ïò²»ÔÙÊÇÏÈǰע²áʼþµÄÔªËØ£¬ÕâʱµÄthisΪwindow¶ÔÏó¡£»¹ÓÐÒ»µãÊÇ´Ë·½·¨µÄʼþÀàÐÍÃû³Æ±ØÐë¼ÓÉÏÒ»¸ö¡±on¡±µÄǰ׺£¨Èçonclick£©¡£
element.attachEvent("onevent",eventListener); |
ÒªÏëÒÆ³ýÏÈÇ°ÔªËØ×¢²áµÄʼþ¼àÌýÆ÷,¿ÉÒÔʹÓÃdetachEvent·½·¨½øÐÐɾ³ý£¬²ÎÊýÏàͬ¡£
DOM±ê׼ϵÄʼþ¼àÌýÆ÷£º
ÔÚÖ§³ÖW3C±ê׼ʼþ¼àÌýÆ÷µÄä¯ÀÀÆ÷ÖУ¬¶Ôÿ¸öÖ§³ÖʼþµÄ¶ÔÏ󶼿ÉÒÔʹÓÃaddEventListener·½·¨¡£¸Ã·½·¨¼ÈÖ§³Ö×¢²áðÅÝÐÍʼþ´¦Àí£¬ÓÖÖ§³Ö²¶»ñÐÍʼþ´¦Àí¡£ËùÒÔÓëIEä¯ÀÀÆ÷ÖÐ×¢²áÔªËØÊ¼þ¼àÌýÆ÷·½Ê½ÓÐËù²»Í¬µÄ¡£
//±ê×¼Óï·¨ 2 element.addEventListener('event', eventListener, useCapture); 3 //ĬÈÏ 4 element.addEventListener('event', eventListener, false); |
addEventListener·½·¨½ÓÊÜÈý¸ö²ÎÊý¡£µÚÒ»¸ö²ÎÊýÊÇʼþÀàÐÍÃû£¬ÖµµÃ×¢ÒâµÄÊÇ£¬ÕâÀïʼþÀàÐÍÃû³ÆÓëIEµÄ²»Í¬£¬Ê¼þÀàÐÍÃûÊÇû¡¯on¡¯¿ªÍ·µÄ;µÚ¶þ¸ö²ÎÊýeventListenerÊǻص÷´¦Àíº¯Êý£¨¼´¼àÌýÆ÷º¯Êý£©;µÚÈý¸ö²ÎÊý×¢Ã÷¸Ã´¦Àí»Øµ÷º¯ÊýÊÇÔÚʼþ´«µÝ¹ý³ÌÖеIJ¶»ñ½×¶Î±»µ÷Óû¹ÊÇðÅݽ׶α»µ÷ÓÃ
£¬Í¨³£´Ë²ÎÊýͨ³£»áÉèÖÃΪfalse£¨ÎªfalseʱÊÇðÅÝ£©,ÄÇô£¬Èç¹û½«ÆäÖµÉèÖÃΪtrue£¬ÄǾʹ´½¨Ò»¸ö²¶×½Ê¼þ¼àÌýÆ÷¡£
ÒÆ³ýÒÑ×¢²áµÄʼþ¼àÌýÆ÷µ÷ÓÃelementµÄremoveEventListener·½·¨¼´¿É£¬²ÎÊýÏàͬ¡£
//±ê×¼Óï·¨ 2 element.removeEventListener('event', eventListener, useCapture); 3 //ĬÈÏ 4 element.removeEventListener('event', eventListener, false); |
ͨ¹ýaddEventListener·½·¨Ìí¼ÓµÄʼþ´¦Àíº¯Êý£¬±ØÐëʹÓÃremoveEventListener·½·¨²ÅÄÜɾ³ý£¬¶øÇÒÒªÇó²ÎÊýÓëÌí¼Óʼþ´¦Àíº¯ÊýʱaddEventListener·½·¨µÄ²ÎÊýÍêȫһÖ£¨°üÀ¨useCapture²ÎÊý£©£¬·ñÔò½«²»Äܳɹ¦É¾³ýʼþ´¦Àíº¯Êý¡£
¿çä¯ÀÀÆ÷µÄ×¢²áÓëÒÆ³ýÔªËØÊ¼þ¼àÌýÆ÷·½°¸
ÎÒÃÇÏÖÔÚÒѾ֪µÀ£¬¶ÔÓÚÖ§³ÖaddEventListener·½·¨µÄä¯ÀÀÆ÷£¬Ö»ÒªÐèҪʼþ¼àÌýÆ÷½Å±¾¾Í¶¼ÐèÒªµ÷ÓÃaddEventListener·½·¨£»¶ø¶ÔÓÚ²»Ö§³Ö¸Ã·½·¨µÄIEä¯ÀÀÆ÷£¬Ê¹ÓÃʼþ¼àÌýÆ÷ʱÔòÐèÒªµ÷ÓÃattachEvent·½·¨¡£ÒªÈ·±£ä¯ÀÀÆ÷ʹÓÃÕýÈ·µÄ·½·¨Æäʵ²¢²»À§ÄÑ£¬Ö»ÐèҪͨ¹ýÒ»¸öif-elseÓï¾äÀ´¼ì²âµ±Ç°ä¯ÀÀÆ÷ÖÐÊÇ·ñ´æÔÚaddEventListener·½·¨»òattachEvent·½·¨¼´¿É¡£
ÕâÑùµÄ·½Ê½¾Í¿ÉÒÔʵÏÖÒ»¸ö¿çä¯ÀÀÆ÷µÄ×¢²áÓëÒÆ³ýÔªËØÊ¼þ¼àÌýÆ÷·½°¸:
var EventUtil = { 2 //×¢²á 3 addHandler: function(element, type, handler){ 4 if (element.addEventListener){ 5 element.addEventListener(type, handler, false); 6 } else if (element.attachEvent){ 7 element.attachEvent("on" + type, handler); 8 } else { 9 element["on" + type] = handler; 10 } 11 }, 12 //ÒÆ³ý×¢²á 13 removeHandler: function(element, type, handler){ 14 if (element.removeEventListener){ 15 element.removeEventListener(type, handler, false); 16 } else if (element.detachEvent){ 17 element.detachEvent("on" + type, handler); 18 } else { 19 element["on" + type] = null; 20 } 21 } 22 }; |
ʼþ¶ÔÏóÒýÓÃ
ΪÁ˸üºÃµÄ´¦Àíʼþ£¬Äã¿ÉÒÔ¸ù¾ÝËù·¢ÉúµÄʼþµÄÌØ¶¨ÊôÐÔÀ´²ÉÈ¡²»Í¬µÄ²Ù×÷¡£
ÈçʼþÄ£ÐÍÒ»Ñù£¬IE ºÍÆäËûä¯ÀÀÆ÷´¦Àí·½·¨²»Í¬£ºIE ʹÓÃÒ»¸ö½Ð×ö event
µÄÈ«¾Öʼþ¶ÔÏóÀ´´¦Àí¶ÔÏó£¨Ëü¿ÉÒÔÔÚÈ«¾Ö±äÁ¿window.eventÖÐÕÒµ½£©£¬¶øÆäËüËùÓÐä¯ÀÀÆ÷²ÉÓÃµÄ W3C
ÍÆ¼öµÄ·½Ê½£¬ÔòʹÓöÀÁ¢µÄ°üº¬Ê¼þ¶ÔÏóµÄ²ÎÊý´«µÝ¡£
¿çä¯ÀÀÆ÷ʵÏÖÕâÑùµÄ¹¦ÄÜʱ£¬×î³£¼ûµÄÎÊÌâ¾ÍÊÇ»ñȡʼþ±¾ÉíµÄÒýÓü°»ñÈ¡¸ÃʼþµÄÄ¿±êÔªËØµÄÒýÓá£
ÏÂÃæÕâ¶Î´úÂë¾ÍΪÄã½â¾öÁËÕâ¸öÎÊÌ⣺
var EventUtil ={ 2 getEvent: function(event){ 3 return event ? event : window.event; 4 }, 5 getTarget: function(event){ 6 return event.target || event.srcElement; 7 } 8 }; |
ֹͣʼþðÅݺÍ×èֹʼþµÄĬÈÏÐÐΪ
¡°Í£Ö¹Ê¼þðÅÝ¡°ºÍ¡±×èÖ¹ä¯ÀÀÆ÷µÄĬÈÏÐÐΪ¡°£¬ÕâÁ½¸ö¸ÅÄî·Ç³£ÖØÒª£¬ËüÃǶԸ´ÔÓµÄÓ¦ÓóÌÐò´¦Àí·Ç³£ÓÐÓá£
1.ֹͣʼþðÅÝ
ֹͣʼþðÅÝÊÇÖ¸£¬Í£Ö¹Ã°ÅÝÐÍʼþµÄ½øÒ»²½´«µÝ£¨È¡Ïûʼþ´«µÝ,²»Ö»ÊÇÍ£Ö¹IEºÍDOM±ê×¼¹²ÓеÄðÅÝÐÍʼþ£¬ÎÒÃÇ»¹¿ÉÒÔÍ£Ö¹Ö§³ÖDOM±ê×¼ä¯ÀÀÆ÷µÄ²¶×½ÐÍʼþ£¬ÓÃtopPropagation()·½·¨£©¡£ÀýÈçÉÏͼÖеÄðÅÝÐÍʼþ´«µÝÖУ¬ÔÚbody´¦Àíֹͣʼþ´«µÝºó£¬Î»ÓÚÉϲãµÄdocumentµÄʼþ¼àÌýÆ÷¾Í²»ÔÙÊÕµ½Í¨Öª£¬²»ÔÙ±»´¦Àí¡£
2.×èֹʼþµÄĬÈÏÐÐΪ
ֹͣʼþµÄĬÈÏÐÐΪÊÇÖ¸£¬Í¨³£ä¯ÀÀÆ÷ÔÚʼþ´«µÝ²¢´¦ÀíÍêºó»áÖ´ÐÐÓë¸Ãʼþ¹ØÁªµÄĬÈ϶¯×÷£¨Èç¹û´æÔÚÕâÑùµÄ¶¯×÷£©¡£ÀýÈ磬Èç¹û±íµ¥ÖÐinput
type ÊôÐÔÊÇ ¡°submit¡±£¬µã»÷ºóÔÚʼþ´«²¥Íêä¯ÀÀÆ÷¾Í×Ô¶¯Ìá½»±íµ¥¡£ÓÖÀýÈ磬input ÔªËØµÄ
keydown ʼþ·¢Éú²¢´¦Àíºó£¬ä¯ÀÀÆ÷ĬÈϻὫÓû§¼üÈëµÄ×Ö·û×Ô¶¯×·¼Óµ½ input ÔªËØµÄÖµÖС£
ֹͣʼþðÅݵĴ¦Àí·½·¨£º
ÔÚIEÏÂ,ͨ¹ýÉèÖÃevent¶ÔÏóµÄcancelBubbleΪtrue¼´¿É¡£
function someHandle() { 2 window.event.cancelBubble = true; 3 } |
DOM±ê׼ͨ¹ýµ÷ÓÃevent¶ÔÏóµÄstopPropagation()·½·¨¼´¿É¡£
function someHandle(event) { 2 event.stopPropagation(); 3 } |
ÒòЩ£¬¿çä¯ÀÀÆ÷µÄֹͣʼþ´«µÝµÄ·½·¨ÊÇ:
function someHandle(event) { 2 event = event || window.event; 3 if(event.stopPropagation){ 4 event.stopPropagation(); 5 }else { 6 event.cancelBubble = true; 7 } 8 } |
×èֹʼþµÄĬÈÏÐÐΪµÄ´¦Àí·½·¨
¾ÍÏñʼþÄ£ÐͺÍʼþ¶ÔÏó²îÒìÒ»Ñù£¬ÔÚIEºÍÆäËüËùÓÐä¯ÀÀÆ÷ÖÐ×èֹʼþµÄĬÈÏÐÐΪµÄ·½·¨Ò²²»Í¬¡£
ÔÚIEÏÂ,ͨ¹ýÉèÖÃevent¶ÔÏóµÄreturnValueΪfalse¼´¿É¡£
function someHandle() { 2 window.event.returnValue = false; 3 } |
DOM±ê׼ͨ¹ýµ÷ÓÃevent¶ÔÏóµÄpreventDefault()·½·¨¼´¿É¡£
function someHandle(event) { 2 event.preventDefault(); 3 } |
ÒòЩ£¬¿çä¯ÀÀÆ÷µÄÈ¡Ïûʼþ´«µÝºóµÄĬÈÏ´¦Àí·½·¨ÊÇ£º
function someHandle(event) { 2 event = event || window.event; 3 if(event.preventDefault){ 4 event.preventDefault(); 5 }else{ 6 event.returnValue = false; 7 } 8 } |
ÍêÕûµÄʼþ´¦Àí¼æÈÝÐÔº¯Êý
var EventUtil = { 2 addHandler: function(element, type, handler){ 3 if (element.addEventListener){ 4 element.addEventListener(type, handler, false); 5 } else if (element.attachEvent){ 6 element.attachEvent("on" + type, handler); 7 } else { 8 element["on" + type] = handler; 9 } 10 }, 11 removeHandler: function(element, type, handler){ 12 if (element.removeEventListener){ 13 element.removeEventListener(type, handler, false); 14 } else if (element.detachEvent){ 15 element.detachEvent("on" + type, handler); 16 } else { 17 element["on" + type] = null; 18 } 19 }, 20 getEvent: function(event){ 21 return event ? event : window.event; 22 }, 23 getTarget: function(event){ 24 return event.target || event.srcElement; 25 }, 26 preventDefault: function(event){ 27 if (event.preventDefault){ 28 event.preventDefault(); 29 } else { 30 event.returnValue = false; 31 } 32 }, 33 stopPropagation: function(event){ 34 if (event.stopPropagation){ 35 event.stopPropagation(); 36 } else { 37 event.cancelBubble = true; 38 } 39 }; |
²¶»ñÐÍʼþÄ£ÐÍÓëðÅÝÐÍʼþÄ£Ð͵ÄÓ¦Óó¡ºÏ
±ê׼ʼþÄ£ÐÍΪÎÒÃÇÌṩÁËÁ½ÖÖ·½°¸£¬¿ÉÄܺܶàÅóÓÑ·Ö²»ÇåÕâÁ½ÖÖ²»Í¬Ä£ÐÍÓÐɶºÃ´¦£¬ÎªÊ²Ã´²»Ö»²ÉȡһÖÖÄ£ÐÍ¡£
ÕâÀïÅ׿ªIEä¯ÀÀÆ÷ÌÖÂÛ£¨IEÖ»ÓÐÒ»ÖÖ£¬Ã»·¨Ñ¡Ôñ£©Ê²Ã´Çé¿öÏÂÊʺÏÄÄÖÖʼþÄ£ÐÍ¡£
1. ²¶»ñÐÍÓ¦Óó¡ºÏ
²¶»ñÐÍʼþ´«µÝÓÉ×î²»¾«È·µÄ׿ÏÈÔªËØÒ»Ö±µ½×ȷµÄʼþÔ´ÔªËØ£¬´«µÝ·½Ê½Óë²Ù×÷ϵͳÖеÄÈ«¾Ö¿ì½Ý¼üÓëÓ¦ÓóÌÐò¿ì½Ý¼üÏàËÆ¡£µ±Ò»¸öϵͳ×éºÏ¼ü·¢Éúʱ£¬Èç¹û×¢²áÁËϵͳȫ¾Ö¿ì½Ý¼ü¼àÌýÆ÷£¬¸Ãʼþ¾ÍÏȱ»²Ù×÷ϵͳ²ã²¶»ñ£¬È«¾Ö¼àÌýÆ÷¾ÍÏÈÓÚÓ¦ÓóÌÐò¿ì½Ý¼ü¼àÌýÆ÷µÃµ½Í¨Öª£¬Ò²¾ÍÊÇÈ«¾ÖµÄÏÈ»ñµÃ¿ØÖÆÈ¨£¬ËüÓÐȨ×èֹʼþµÄ½øÒ»²½´«µÝ¡£ËùÒÔ²¶»ñÐÍʼþÄ£ÐÍÊÊÓÃÓÚ×÷È«¾Ö·¶Î§ÄڵļàÌý£¬ÕâÀïµÄÈ«¾ÖÊÇÏà¶ÔµÄÈ«¾Ö£¬Ïà¶ÔÓÚij¸ö¶¥²ã½áµãÓë¸Ã½áµãËùÓÐ×ÓËï½áµãÐγɵļ¯ºÏ·¶Î§¡£
ÀýÈçÄãÏë×÷È«¾ÖµÄµã»÷ʼþ¼àÌý£¬Ïà¶ÔÓÚdocument½áµãÓëdocumentÏÂËùÓеÄ×Ó½áµã£¬ÔÚij¸öÌõ¼þÏÂÒªÇóËùÓеÄ×Ó½áµãµã»÷ÎÞЧ£¬ÕâÖÖÇé¿öÏÂðÅÝÄ£Ð;ͽâ¾ö²»ÁËÁË£¬¶ø²¶»ñÐÍÈ´·Ç³£Êʺϣ¬¿ÉÒÔÔÚ×î¶¥²ã½áµãÌí¼Ó²¶»ñÐÍʼþ¼àÌýÆ÷£¬Î±ÂëÈçÏÂ:
function globalClickListener(event) { 2 if(canEventPass == false) { 3 //È¡Ïûʼþ½øÒ»²½Ïò×Ó½áµã´«µÝºÍðÅÝ´«µÝ 4 event.stopPropagation(); 5 //È¡Ïûä¯ÀÀÆ÷ʼþºóµÄĬÈÏÖ´ÐÐ 6 event.preventDefault(); 7 } 8 } |
ÕâÑùÒ»À´£¬µ±canEventPassÌõ¼þΪ¼Ùʱ£¬documentÏÂËùÓеÄ×Ó½áµãclick×¢²áʼþ¶¼²»»á±»ä¯ÀÀÆ÷´¦Àí¡£
2. ðÅÝÐ͵ÄÓ¦Óó¡ºÏ
¿ÉÒÔ˵ÎÒÃÇÆ½Ê±ÓõͼÊÇðÅÝʼþÄ£ÐÍ£¬ÒòΪIEÖ»Ö§³ÖÕâÄ£ÐÍ¡£ÕâÀﻹÊÇ˵˵£¬ÔÚÇ¡µ±ÀûÓøÃÄ£ÐÍ¿ÉÒÔÌá¸ß½Å±¾ÐÔÄÜ¡£ÔÚÔªËØÒ»Ð©Æµ·±´¥·¢µÄʼþÖУ¬Èç
onmousemove,onmouseover,onmouseout,Èç¹ûÃ÷ȷʼþ´¦Àíºóû±ØÒª½øÒ»²½´«µÝ£¬ÄÇô¾Í¿ÉÒԴ󵨵ÄÈ¡ÏûËü¡£´ËÍ⣬¶ÔÓÚ×Ó½áµãʼþ¼àÌýÆ÷µÄ´¦Àí»á¶Ô¸¸
²ã¼àÌýÆ÷´¦ÀíÔì³É¸ºÃæÓ°ÏìµÄ£¬Ò²Ó¦¸ÃÔÚ×Ó½áµã¼àÌýÆ÷Öнûֹʼþ½øÒ»²½ÏòÉÏ´«µÝÒÔÏû³ýÓ°Ïì¡£
×ۺϰ¸Àý·ÖÎö
×îºó½áºÏÏÂÃæHTML´úÂë×÷·ÖÎö:
<body onclick="alert('current is body');"> 2 <div id="div0" onclick="alert('current is '+this.id)"> 3 <div id="div1" onclick="alert('current is '+this.id)"> 4 <div id="div2" onclick="alert('current is '+this.id)"> 5 <div id="event_source" onclick="alert('current is '+this.id)" style="height:200px;width:200px;background-color:red;"></div> 6 </div> 7 </div> 8 </div> 9 </body> |
HTMLÔËÐкóµã»÷ºìÉ«ÇøÓò,ÕâÊÇ×îÀï²ãµÄDIV,¸ù¾ÝÉÏÃæËµÃ÷,ÎÞÂÛÊÇDOM±ê×¼»¹ÊÇIE,Ö±½ÓдÔÚhtmlÀïµÄ¼àÌý´¦Àíº¯ÊýÊÇʼþðÅÝ´«µÝʱµ÷ÓõÄ,ÓÉ×îÀï²ãÒ»Ö±ÍùÉÏ´«µÝ,ËùÒÔ»áÏȺó³öÏÖ
current is event_source current is div2 current is div1 current is div0 current is body |
¼ÓÒÔÏÂÆ¬¶Î:
var div2 = document.getElementById('div2'); 2 EventUtil.addHandler(div2, 'click', function(event){ 3 event = EventUtil.getEvent(event); 4 EventUtil.stopPropagation(event); 5 }, false);
current is event_sourcecurrent is div2 |
µ±µã»÷ºìÉ«ÇøÓòºó,¸ù¾ÝÉÏÃæËµÃ÷,ÔÚÅÝðÅÝ´¦ÀíÆÚ¼ä,ʼþ´«µÝµ½div2ºó±»Í£Ö¹´«µÝÁË,ËùÒÔdiv2ÉϲãµÄÔªËØÊÕ²»µ½Í¨Öª,ËùÒÔ»áÏȺó³öÏÖ:
ÔÚÖ§³ÖDOM±ê×¼µÄä¯ÀÀÆ÷ÖÐ,Ìí¼ÓÒÔÏ´úÂë:
document.body.addEventListener('click', function(event){ event.stopPropagation();
}, true); |
ÒÔÉÏ´úÂëÖеļàÌýº¯ÊýÓÉÓÚÊDz¶»ñÐÍ´«µÝʱ±»µ÷ÓõÄ,ËùÒÔµã»÷ºìÉ«ÇøÓòºó,ËäȻʼþÔ´ÊÇIDΪevent_sourceµÄÔªËØ,µ«²¶»ñÐÍÑ¡´«µÝ,´Ó×î¶¥²ã¿ªÊ¼,body½áµã¼àÌýº¯ÊýÏȱ»µ÷ÓÃ,²¢ÇÒÈ¡ÏûÁËʼþ½øÒ»²½ÏòÏ´«µÝ,ËùÒÔÖ»»á³öÏÖ
current is body .
|