问题
how do I properly escape the cancel button without throwing an error when using promises? My code throws an alert confirmation with a required checkbox. the code executes as it should to the user, but it throws an error in the console window:
Uncaught (in promise) cancel
//validation logic all passes...Now proceed to...
else
{
//determine and parse Discounts
var myLookup = document.getElementsByName("myLookup")[0].value;
$.post( "findthem.php", {myLookup: myLookup })
.done(function(json_data){
var theResponse1 = $.parseJSON(json_data);
myDiscountRate = theResponse1['ourDiscountFound'];
}).then( function(callback){
priceRate = priceRate * (1 - (.01 * myDiscountRate));
newRate = priceRate.toFixed(2);
}
swal({
title: "Confirm",
input: 'checkbox',
inputValue: 0,
type: "warning",
inputPlaceholder: 'I agree to <a href="#blahblahMore"></a> Your new Rate is :'+newRate,
showCancelButton: true,
confirmButtonText: 'Confirm',
showLoaderOnConfirm: true,
preConfirm: function(result) {
return new Promise(function(resolve, reject) {
if (result) {
$.post("my.php", {
Data: data
})
.done(
function(json_data) {
var data_array = $.parseJSON(json_data);
var moreDetails = '';
var resulting = 'error';
var details = "Transaction Declined"
if (data_array["trxApproved"] == true) {
resulting = 'success';
details = "Confirmed"
moreDetails = "<br>Approved<b>" + data_array["approved"] + "</b>" +
"<br>Details Code: <b>" + data_array["detailsCode"] + "</b>";
}
swal({
type: resulting,
title: details,
html: "<h1>Details: </h1>" + data_array["messagetext"] + moreDetails
});
}
);
resolve();
} else {
reject('You must agree to our Terms & Conditions ');
}
});
},
allowOutsideClick: false
}).then(function(json_data) {
})
});
回答1:
Update (Jan 2017): This issue has been fixed in v7: v7 upgrade guide ↗
You need to add a rejection handler to the Promise. Alternatively, you can use .catch(swal.noop) as a quick way to simply suppress the errors:
swal('...')
.catch(swal.noop);
PS. the package you're using is called SweetAlert2, not SweetAlert. In future questions please mention it so you can get more relevant answers.
回答2:
SweetAlert2 rejects the result promise when the cancel button is pressed. You can handle that:
swal({
…
}).then(function(json_data) {
…
}, function(dismiss) {
if (dismiss === 'cancel') { // you might also handle 'close' or 'timer' if you used those
// ignore
} else {
throw dismiss;
}
})
If you don't need to do anything with the json_data, you might also use the catch method.
回答3:
new Promise(function(resolve, reject) { is not necessary. $.post() returns a jQuery promise object.
Possible solution substitutes Promise.reject() for new Promise() constructor; removed .then() that was placed as an option to first swal() call; pattern appears to expect a Promise to be returned from preConfirm, though not certain what value is expected to be returned from .done() other than json_data.
swal({
title: "Confirm",
input: 'checkbox',
inputValue: 0,
type: "warning",
inputPlaceholder: 'I agree to <a href="#blahblahMore"></a>',
showCancelButton: true,
confirmButtonText: 'Confirm',
showLoaderOnConfirm: true,
preConfirm: function(result) {
if (result) {
return $.post("my.php", {
Data: data
})
.done(
function(json_data) {
var data_array = $.parseJSON(json_data);
var moreDetails = '';
var resulting = 'error';
var details = "Transaction Declined"
if (data_array["trxApproved"] == true) {
resulting = 'success';
details = "Confirmed"
moreDetails = "<br>Approved<b>" + data_array["approved"] + "</b>" +
"<br>Details Code: <b>" + data_array["detailsCode"] + "</b>";
}
swal({
type: resulting,
title: details,
html: "<h1>Details: </h1>" + data_array["messagetext"] + moreDetails
});
}
);
} else {
return Promise.reject('You must agree to our Terms & Conditions ');
}
},
allowOutsideClick: false
});
回答4:
Adding catch(swal.noop); at the end swal function will solve this problem
For example:
swal({
}).then(function() {
}).catch(swal.noop);
回答5:
you will need to catch the action for cancel
swal({
title: 'Are you sure?',
text: "You won't be able to revert this!",
type: 'warning',
showCancelButton: true,
confirmButtonColor: '#3085d6',
cancelButtonColor: '#d33',
confirmButtonText: 'Yes, delete it!'
}).then(function(json_data) {
//delete item
}, function(dismiss) {
if (dismiss === 'cancel' || dismiss === 'close') {
// ignore
}
})
来源：https://stackoverflow.com/questions/39321621/uncaught-in-promise-cancel-using-sweetalert2