Getting Error message "Object doesn't support property or method 'attachEvent'" in IE11 to call SAP system

Note that attachEvent is no longer supported in IE11 and you should use addEventListener that can be used to bind specific function to an event.

Using attachEvent in Older IE Versions

In older versions of IE (IE8 and below), you can use attachEvent like this ?

object.attachEvent(event, pDisp)

Parameters

event [in]

Type: String
A String that specifies any of the standard DHTML Events.

pDisp [in]

Type: Object
The Pointer that specifies the function to call when the event fires.

Return Value

Type: Boolean
Boolean returns any of the below value ?

Cross-Browser Solution

Note that IE has included support for addEventListener from IE9 and above only. Now if you want to support IE8, we suggest you use some cross-browser library like jQuery to bind event handlers.

Example

Here's a cross-browser approach to handle events ?

function addEvent(element, event, handler) {
    if (element.addEventListener) {
        // Modern browsers including IE9+
        element.addEventListener(event, handler, false);
    } else if (element.attachEvent) {
        // IE8 and below
        element.attachEvent('on' + event, handler);
    }
}

// Usage example
var button = document.getElementById('myButton');
addEvent(button, 'click', function() {
    alert('Button clicked!');
});

For more information about addEventListener, refer to the Microsoft documentation: https://msdn.microsoft.com/en-us/library/ff975245(v=vs.85).aspx

Conclusion

When encountering the "Object doesn't support property or method 'attachEvent'" error in IE11, replace attachEvent with addEventListener or use a cross-browser solution to support older IE versions.