未捕获（承诺）使用 SweetAlert2 取消

Question

如何在使用 promises 时正确地退出取消按钮而不抛出错误？我的代码抛出带有必填复选框的警报确认。代码按用户应有的方式执行，但在控制台中抛出错误 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) {

  })
});

Answer 1

new Promise(function(resolve, reject) { 没有必要。 $.post() returns 一个 jQuery 承诺对象。

可能的解决方案是用 Promise.reject() 代替 new Promise() 构造函数；删除了作为第一个 swal() 调用的选项放置的 .then()； pattern 似乎期望从 preConfirm 返回 Promise，但不确定除了 json_data.

之外，期望从 .done() 返回什么值

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
});

Answer 2

SweetAlert2 在按下取消按钮时拒绝结果承诺。你可以 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;
  }
})

如果您不需要对 json_data 进行任何操作，您也可以使用 catch method。

Answer 3

更新（2017 年 1 月）： 此问题已在 v7 中修复：v7 upgrade guide ↗

您需要向 Promise 添加拒绝处理程序。或者，您可以使用 .catch(swal.noop) 作为简单抑制错误的快速方法：

swal('...')
  .catch(swal.noop);

PS。您使用的包名为 SweetAlert2，而不是 SweetAlert。在以后的问题中请提及它，以便您可以获得更多相关答案。

Answer 4

您需要捕捉取消操作

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
  } 
})

Answer 5

添加捕获(swal.noop);最后swal函数会解决这个问题

例如：

swal({

}).then(function() {

}).catch(swal.noop);

未捕获（承诺）使用 SweetAlert2 取消

Uncaught (in promise) cancel using SweetAlert2

javascript

ajax

jquery

sweetalert

sweetalert2