Professional: JavaScript® for Web Developers by Nicholas C. Zakas

Author:Nicholas C. Zakas
Language: eng
Format: mobi
Publisher: John Wiley & Sons
Published: 2011-12-13T10:00:00+00:00

var EventUtil = {

//more code here

getButton: function(event){

if (document.implementation.hasFeature("MouseEvents", "2.0")){

return event.button;

} else {

switch(event.button){

case 0:

case 1:

case 3:

case 5:

case 7:

return 0;

case 2:

case 6:

return 2;

case 4:

return 1;

}

}

},

//more code here

};

EventUtil.js

Checking for the feature "MouseEvents" determines if the button property that is already present on event contains the correct values. If that test fails, then the browser is likely Internet Explorer and the values must be normalized. This method can then be used as follows:

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