ダイアログpolyfill関数のいくつかの変更によってこの問題を解決しました。最終コード:
(function() {
window.spawn = window.spawn || function (gen) {
function continuer(verb, arg) {
var result;
try {
result = generator[verb](arg);
} catch (err) {
return Promise.reject(err);
}
if (result.done) {
return result.value;
} else {
return Promise.resolve(result.value).then(onFulfilled, onRejected);
}
}
var generator = gen();
var onFulfilled = continuer.bind(continuer, 'next');
var onRejected = continuer.bind(continuer, 'throw');
return onFulfilled();
};
window.showModalDialog = window.showModalDialog || function (url, arg, opt) {
url = url || '';
arg = arg || null;
opt = opt || 'dialogWidth:300px;dialogHeight:200px';
var caller = showModalDialog.caller.toString();
var dialog = document.body.appendChild(document.createElement('dialog'));
dialog.setAttribute('style', opt.replace(/dialog/gi, ''));
dialog.innerHTML = '<a href="#" id="dialog-close" style="position: absolute; top: 0; right: 4px; font-size: 20px; color: #000; text-decoration: none; outline: none;">×</a><iframe id="dialog-body" src="' + url + '" style="border: 0; width: 100%; height: 100%;"></iframe>';
document.getElementById('dialog-body').contentWindow.dialogArguments = arg;
document.getElementById('dialog-close').addEventListener('click', function (e) {
e.preventDefault();
//dialog.close();
var event = document.createEvent('Event');
event.initEvent('myEvent', true, true);
dialog.dispatchEvent(event);
});
try {
//dialog.showModal()
dialog.style.top = '50px';
dialog.style.display = 'block';
document.getElementsByTagName('body')[0].appendChild(dialog);
}
catch (err) {
alert(err);
}
//if using yield
if (caller.indexOf('yield') >= 0) {
return new Promise(function (resolve, reject) {
dialog.addEventListener('myEvent', function() {
var returnValue = document.getElementById('dialog-body').contentWindow.returnValue;
document.body.removeChild(dialog);
resolve(returnValue);
});
});
}
//if using eval
var isNext = false;
var nextStmts = caller.split('\n').filter(function (stmt) {
if (isNext || stmt.indexOf('showModalDialog(') >= 0)
return isNext = true;
return false;
});
dialog.addEventListener('close', function() {
var returnValue = document.getElementById('dialog-body').contentWindow.returnValue;
document.body.removeChild(dialog);
nextStmts[0] = nextStmts[0].replace(/(window\.)?showModalDialog\(.*\)/g, JSON.stringify(returnValue));
eval('{\n' + nextStmts.join('\n'));
});
throw 'Execution stopped until showModalDialog is closed';
};
})();