退出键停止加载Web应用程序

Question

Hi we are facing the problem with escape key in our web application. If user press the escape key the web application gets stop loading. I tried using all these with(onkeydown and onkeyup)

document.attachEvent("onkeydown", win_onkeydown_handler);
window.attachEvent("onkeydown", win_onkeydown_handler);
window.document.attachEvent("onkeydown", win_onkeydown_handler);

I cant able detect the escape( KeyCode=27 ) in my web application .. but i am able to detect refresh,f5 and all other keys

Note: i face this problem in IE

Answer 1

This helps me to prevent escape in iframe

function disableEscapeAndRefresh(){
try{
    if(window.frames && window.frames[0]){
        window.frames[0].focus();
        for (var i_tem = 0; i_tem < window.frames.length; i_tem++){
            if(document.all && document.body.filters)
                window.frames[i_tem].document.onkeydown = new Function("var e=window.frames["+i_tem+"].event; if(e.keyCode==116){e.keyCode=0;alert('Refresh Not Allowed');return false;}if(e.keyCode==27){e.keyCode=0;alert('Escape Not Allowed');return false;};");
        }
    }
}catch(e){

}
}

call this method in iframe onload

Answer 2

我认为没有任何办法可以捕获它……这等效于单击X来停止页面加载。

Answer 3

Assuming that you are targeting versions of IE that have attachEvent enabled, you can use this to detect the escape key being pressed. The handling of the event is the usual code for preventing default event behaviour, though this may not work on cancelling the page download as this may be seen as a security flaw (imagine the unscrupulous developer that wants to prevent the user from cancelling a malicious download):

document.attachEvent('onkeydown', function(){
  if(window.event.keyCode == 27) {
    window.event.returnValue = false; 
    window.event.cancelBubble = true;
  }
});

http://jsfiddle.net/steveukx/LJHs8/