jquery - catching Uncaught (in promise) DOMException javascript -


i'm trying display error when user upload corrupt file or file not , image. when upload file not image uncaught (in promise) domexception: appear.

how catch error , display in div. i've tried try , catch, window.onerror doesn't when error occur.

this code.

$('.upload-result').on('click', function(ev){       if($('#upload').get(0).files.length === 0){         $('.nofile').show();       }else{         if($.inarray($('#upload').val().split('.').pop().tolowercase(), ['gif','png','jpg','jpeg']) == -1){             $('.invalid-file').show();         }else{            $uploadcrop.croppie('result',{ //error occurs here              type: 'canvas',             size: 'viewport'           }).then(function (resp){             $.ajax({               url: "{{url('dashboard/program/imageupload')}}",               type: "post",               data: {"image":resp, "id":id},               success:function(data){                 $('.success').show(0, function(){                   settimeout(function(){                     location.href = "{{route('program')}}"                   }, 1000);                 });               },               error: function (xhr, textstatus, errorthrown) {                   alert("fail");               }             });           });         }       }      });      window.onerror = function() {       alert("an error");     }

adding catch statement after then, keeps application safe , can handle various errors dynamically.

$uploadcrop.croppie('result', {    //error occurs here    type: 'canvas',    size: 'viewport', }) .then(function(resp) {    $.ajax({       url: "{{url('dashboard/program/imageupload')}}",       type: 'post',       data: { image: resp, id: id },       success: function(data) {          $('.success').show(0, function() {             settimeout(function() {                location.href = "{{route('program')}}"             }, 1000)          })       },       error: function(xhr, textstatus, errorthrown) {          alert('fail')       },    }) }) .catch(err => /* handle error here */)

the important part this: 

.catch(err => /* handle error here */)

if want learn more promises , why there , how use them, read this: mdn promises or medium.com: promises explained gambling


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