angular/components

mat-hint not animated when showed for first time on condition

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#9,747 建立於 2018年2月2日

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P4area: material/form-fieldhelp wanted

描述

Bug, feature request, or proposal:

Maybe a bug, definitely a feature

What is the expected behavior?

When I put a condition on the mat-hint element (for instance, show it only if a character has been typed), the element should be animated and slide in from the input.

What is the current behavior?

At first, the element isn't animated. Until a mat-error is shown, the element won't be animated.

What are the steps to reproduce?

Stackblitz

貢獻者指南

技術棧
angulartypescriptcss
領域
frontend
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Angular MaterialCSS animation concepts
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
45
研究方向
The issue likely involves the mat hint animation within Angular Material's form field component. Check the components directory under src/material/form field for animation related code. The Stackblitz demo shows that the hint element doesn't animate on initial conditional display. Examine the animation trigger for the hint element and compare with how mat error animates. Look for differences in the Angular animation state transitions.