純粋な JavaScript
異なるホスト上にあるにもかかわらず、両方のドメインでコードを制御しているように見えるため、iframe 内から次を使用できるはずです。
var warnNavigateAway = true;
var confirmBrowseAway = function(){
/// if warn is enabled, then ask the user. otherwise assume "browse away"
var v = (
warnNavigateAway
?
/// use the built-in confirm dialog to notify the user, this will also
/// halt execution - meaning the page close is prevented until an
/// answer is given.
confirm('If you leave this page, your work will be lost ...')
:
true
);
if ( v ) {
/// disable the warn just in case our deleting of the
/// iframe triggers the onunload
warnNavigateAway = false;
}
return v;
}
/// i've kept the use of "onevent" handlers as in your example, but you
/// should use addEventListener and attachEvent in the same way as I have
/// for the second part of the code in the outer frame.
/// apply as a listener in case the user navigates without using the button
window.onbeforeunload = confirmBrowseAway;
/// apply the same method for the onclick of the button
document.getElementById('cancelButton').onclick = function(){
if ( confirmBrowseAway() ) {
window.parent.postMessage('close_iframe', 'http://xyz/');
}
}
およびホスト フレームの次のとおりです。
var messageListener = function(e){
if ( e.origin !== "http://lmn/" ) {
return;
}
if ( e.data == 'close_iframe' ) {
/// however you prefer to close your iframe
document.getElementById('myIframe').style.display = 'none';
/// or removal...
document.getElementById('myIframe').parentNode.removeChild(
document.getElementById('myIframe')
);
}
};
if ( window.addEventListener ) {
window.addEventListener("message", messageListener, false);
}
else if( window.attachEvent ) {
window.attachEvent("onmessage", messageListener);
}
(上記のコードは手動で入力されているため、エラーが発生する可能性があります。説明のための例です)
上記では、iframe とボタンのマークアップを少し変更する必要があります。
<button id="cancelButton" class="cancelBtn">Cancel</button>
と
<iframe id="myIframe" ... />
jQuery
あなたがjQueryを使用していることに気付かなかったので、ここにjQueryバージョンがあります:)
iframe:
var warnNavigateAway = true;
var confirmBrowseAway = function(){
/// if warn is enabled, then ask the user. otherwise assume "browse away"
var v = (
warnNavigateAway
?
/// use the built-in confirm dialog to notify the user, this will also
/// halt execution - meaning the page close is prevented until an
/// answer is given.
confirm('If you leave this page, your work will be lost ...')
:
true
);
if ( v ) {
/// disable the warn just in case our deleting of the
/// iframe triggers the onunload
warnNavigateAway = false;
}
return v;
}
$(window).bind('beforeunload', confirmBrowseAway);
$('.cancelBtn').bind('click', function(){
if ( confirmBrowseAway() ) {
$.postMessage( 'close_iframe', 'http://xyz/' )
}
});
ホストで:
$.receiveMessage(
function(e){
if ( e.data == 'close_iframe' ) {
/// however you prefer to close your iframe
$('.myIframe').hide();
/// or removal...
$('.myIframe').remove();
}
},
"http://lmn/"
);