I want to create a component with one input box with type="date" and a combobox that gets populated with options after a date is selected in the first input box component. I want this to happen in real time(async maybe?), right after the dateChange in the input box. I have tried a method which can be seen below, but as far as I can gather it is not async, and it also throws this error "UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode)." As can be seen, I do in fact throw a .catch() statement after the method but I still get this warning. Anyway the function I use is not asynchronous so any suggestion is welcomed.


    <lightning-layout class="slds-align_left slds-text-align_center container" multiple-rows="true">
        <lightning-layout-item size="12">
            <lightning-input type="date" label="Enter appointment date" variant="label-hidden"
             placeholder="Choose date of appointment" onchange={handleDateChange}></lightning-input>

        <lightning-layout-item size="12">
            <lightning-combobox name="timeBox"></lightning-combobox>


import getVisitsByDate from '@salesforce/apex/VisitsController.getVisitsByDate';
import { LightningElement,api, track } from 'lwc';

export default class LeftComponent extends LightningElement {

    @track dateSelected;
    @api selectedVisit;

    async handleDateChange(event){

               record : {
                   sObjectType: 'Visit__c',
                   Date__c: this.dateSelected
           ).then((value) => {
               return value;
           ).catch((e) => {
               console.log('Throws error'+e.body);

VisitsController.cls(only relevant code)

public with sharing class VisitsController {
    public static List<Visit> getVisitsByDate(Visit__c record) {
        String date = record.Date__c;
         String usrId=  UserInfo.getUserID();
      List<SObject> visits = Database.query(
        'SELECT Name, Date__c, Time__c, Patient_Email__c, Patient_Name__c, Description__c FROM Visit__c WHERE CreatedById=:usrId AND Date__c=:date ORDER BY Time__c ASC'
      return getVisits(visits);

//Method that wraps sObject into a Visit object
    public static List<Visit> getVisits(List<SObject> objs) {
        List<Visit> visits = new List<Visit>();
        for (SObject obj : objs) {
          Visit visit = new Visit();
            Visit.visitTime= obj.get('Time__c');
            visit.patientEmail= String.valueOf(obj.get('Patient_Email__c'));

        return visits;

    class Visit{
        public Date visitDate;

        public Time visitTime;

        public String patientEmail;
        public String patientName;

        public String visitDescription;

        public String visitName;

  • You are not casting the time value correctly I think: Visit.visitTime= obj.get('Time__c'); should be visit.visitTime= (Time)obj.get('Time__c');. However, you also seem to have the async function defined incorrectly - I'm not sure of the correct format for that. Commented Apr 24, 2021 at 4:32
  • Hmm, remove async. You don't need it. Plus it's causing the errors. Commented Apr 24, 2021 at 4:33
  • Ok, so I had tried the removal of async and it did not work. However, your suggestion of the correction of the Time casting seems to get rid of the previous warning. I do, however get an error when sending the request(plus it gets sent as a POST, instead of a GET). {"error":[{"message":"error parsing apex response: */{\n \"message\":\"No apex action available for VisitsController.getVisitsByDate\"\n}/*ERROR*/"}]} Commented Apr 24, 2021 at 8:57
  • Hmm make sure you have enabled access to that class. Also check the case of the name in the import. Also, you might run into this issue trailblazer.salesforce.com/issues_view?id=a1p3A0000001CBeQAM - although this specifically affects Aura components, it could well affect lwc as well. Commented Apr 26, 2021 at 4:29

1 Answer 1


I'm fairly sure that your problem stems from the inner class.

You can simply serialize the class and return a string at parse it in Javascript ie:

return JSON.serialize(visits);

Or you could declare and interface in the VisitController class:

public interface VisitInterface {}

And make your Visit inner class implement the interface:

public class Visit implements VisitInterface

Then return a list of VisitInterface objects - this will then allow the lwc app to see the method.

Nothing else should be needed - you should be able to access the members of the Visit class with no problems in your Javascript. Of course, it's a lot easier to serialize, but perhaps not as pretty :)

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