addEventListener not working in IE8

问题:

I have created a checkbox dynamically. I have used addEventListener to call a function on click of the checkbox, which works in Google Chrome and Firefox but doesn\'t work in Internet Explorer 8. This is my code:

var _checkbox = document.createElement(\"input\");
_checkbox.addEventListener(\"click\", setCheckedValues, false);

setCheckedValues is my event handler.

回答1:

Try:

if (_checkbox.addEventListener) {
    _checkbox.addEventListener(\"click\", setCheckedValues, false);
}
else {
    _checkbox.attachEvent(\"onclick\", setCheckedValues);
}

Update:: For Internet Explorer versions prior to IE9, attachEvent method should be used to register the specified listener to the EventTarget it is called on, for others addEventListener should be used.

回答2:

You have to use attachEvent in IE versions prior to IE9. Detect whether addEventListener is defined and use attachEvent if it isn\'t:

if(_checkbox.addEventListener)
    _checkbox.addEventListener(\"click\",setCheckedValues,false);
else
    _checkbox.attachEvent(\"onclick\",setCheckedValues);
//                         ^^ -- onclick, not click

Note that IE11 will remove attachEvent.

See also:

• MDN: element.addEventListener: Legacy Internet Explorer and attachEvent
• MSDN: attachEvent method

回答3:

This is also simple crossbrowser solution:

var addEvent =  window.attachEvent||window.addEventListener;
var event = window.attachEvent ? \'onclick\' : \'click\';
addEvent(event, function(){
    alert(\'Hello!\')
});

Instead of \'click\' can be any event of course.

回答4:

IE doesn\'t support addEventListener until version 9, so you have to use attachEvent, here\'s an example:

if (!someElement.addEventListener) {
    _checkbox.attachEvent(\"onclick\", setCheckedValues);
}
else {
    _checkbox.addEventListener(\"click\", setCheckedValues, false);
}

回答5:

Mayb it\'s easier (and has more performance) if you delegate the event handling to another element, for example your table

$(\'idOfYourTable\').on(\"click\", \"input:checkbox\", function(){

});

in this way you will have only one event handler, and this will work also for newly added elements. This requires jQuery >= 1.7

Otherwise use delegate()

$(\'idOfYourTable\').delegate(\"input:checkbox\", \"click\", function(){

});

回答6:

You can use the below addEvent() function to add events for most things but note that for XMLHttpRequest if (el.attachEvent) will fail in IE8, because it doesn\'t support XMLHttpRequest.attachEvent() so you have to use XMLHttpRequest.onload = function() {} instead.

function addEvent(el, e, f) {
    if (el.attachEvent) {
        return el.attachEvent(\'on\'+e, f);
    }
    else {
        return el.addEventListener(e, f, false);
    }
}

var ajax = new XMLHttpRequest();
ajax.onload = function(e) {
}

回答7:

I\'ve opted for a quick Polyfill based on the above answers:

//# Polyfill
window.addEventListener = window.addEventListener || function (e, f) { window.attachEvent(\'on\' + e, f); };

//# Standard usage
window.addEventListener(\"message\", function(){ /*...*/ }, false);

Of course, like the answers above this doesn\'t ensure that window.attachEvent exists, which may or may not be an issue.

回答8:

If you use jQuery you can write:

$( _checkbox ).click( function( e ){ /*process event here*/ } )

回答9:

if (document.addEventListener) {
    document.addEventListener(\"click\", attachEvent, false);
}
else {
    document.attachEvent(\"onclick\", attachEvent);
}
function attachEvent(ev) {
    var target = ev.target || ev.srcElement;
    // custom code
}