Why Doesn\'t My `onClick` Event Listener Work in IE8, and How Can I Fix It?

IE8 onClick Event Listener Compatibility Issue

Problem:
In the provided code, the JavaScript event listener for the li element is not functioning in the IE8 browser.

Solution:

IE8 lacks the addEventListener method, so an alternative cross-browser event handling solution is required. The following code provides a polyfill for addEventListener that works in both standard and legacy browsers:

var hookEvent = (function() {
    var div;

    // Standard-compliant browsers
    function standardHookEvent(element, eventName, handler) {
        element.addEventListener(eventName, handler, false);
        return element;
    }

    // Legacy IE browsers
    function oldIEHookEvent(element, eventName, handler) {
        element.attachEvent("on" + eventName, function(e) {
            e = e || window.event;
            e.preventDefault = oldIEPreventDefault;
            e.stopPropagation = oldIEStopPropagation;
            handler.call(element, e);
        });
        return element;
    }

    function oldIEPreventDefault() {
        this.returnValue = false;
    }

    function oldIEStopPropagation() {
        this.cancelBubble = true;
    }

    div = document.createElement('div');
    if (div.addEventListener) {
        div = undefined;
        return standardHookEvent;
    }
    if (div.attachEvent) {
        div = undefined;
        return oldIEHookEvent;
    }
    throw "Neither modern event mechanism (addEventListener nor attachEvent) is supported by this browser.";
})();

Usage:
In the provided code, replace the getElementById().addEventListener() calls with:

hookEvent(document.getElementById("hd_vertical"), "click", function(e) {
   // ...
});

Additional Notes:

• IE8 also does not support getElementsByClassName. Use querySelectorAll instead.
• The provided polyfill normalizes some event properties but not all. Consider using a library like jQuery for comprehensive event handling.

The above is the detailed content of Why Doesn\'t My `onClick` Event Listener Work in IE8, and How Can I Fix It?. For more information, please follow other related articles on the PHP Chinese website!