angular/components

DatePicker not showing initial value when using MomentAdapter

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#13264 opened on Sep 22, 2018

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P3area: material/datepickerhelp wanted

Description

Bug, feature request, or proposal:

Bug

What is the expected behavior?

The datepicker should show the initial value when provided.

What is the current behavior?

It does not

What are the steps to reproduce?

https://stackblitz.com/angular/kbyqgkdyyjo?file=app%2Fdatepicker-moment-example.ts

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Latest Angular. Chrome 69.0.3497.100 FireFox 62

Is there anything else we should know?

It is working here for some reason. https://material.angular.io/components/datepicker/overview#choosing-a-date-implementation-and-date-format-settings

Contributor guide

Tech stack
typescriptangular
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Angular basicsDatepicker usage
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
The issue provides a StackBlitz reproduction (https://stackblitz.com/angular/kbyqgkdyyjo?file=app%2Fdatepicker moment example.ts) showing the DatePicker not displaying the initial value when using MomentAdapter. Investigate the MomentAdapter implementation in the Angular Material source to identify why the initial value binding fails. Compare with the working example on the official documentation site to spot differences. Look for any recent changes to the datepicker or MomentAdapter that may have caused the regression.