Angular not able to call service from eventhandler

Inside the ngOnInit() I am initializing a event

if (!window.addEventListener)
{
this.window.attachEvent('onmessage', this.eventHandler.bind(null, this.router));
}
else
{
window.addEventListener('message', this.eventHandler.bind(null, this.router), false);
}


and inside the eventHandler as shown below I try make a call to service but the service is not being called

eventHandler = function (router, e)
{
if (response.type === "PAGE_LOAD" && response.data.pageName === "DOC")
{
this.BuilderService.deleteUser(this.filter).subscribe(data => this.success(),(err) => this.handleError(err.statusText));
}
}


Could someone please help me fix this issue?

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