bug(input, select): changing font size with label-placement="floating" causes incorrect label position

[EinfachHans]

Prerequisites

• [X] I have read the Contributing Guidelines.
• [X] I agree to follow the Code of Conduct.
• [X] I have searched for existing issues that already report this problem, without success.

Ionic Framework Version

v7.x

Current Behavior

The floating label placement of an outlined <ion-select> seems buggy in my applications so i debugged in and mentioned that the current implementation is not very consistent and for example breaks if you set for example a different font size.

Atm the label is placed by (select example):

:host(.select-label-placement-floating) .label-text-wrapper {
    transform: translateY(100%) scale(1);
}

what only works if the label (the label-text-wrapper element) has1/3 of the height of the select itself as far as i understand. This stops working if you set a different font size on a input/select.

Expected Behavior

The implementation should force the label to be always centered in the middle. For example:

:host(.select-label-placement-floating) .label-text-wrapper {
    top: 50%;
    transform: translateY(-50%) scale(1);
}

and then of course reset the top property on other states

Steps to Reproduce

Change the font size on a md outlined floating label select or input element

Code Reproduction URL

No response

Ionic Info

Let me know if required

Additional Information

No response

[ionitron-bot[bot]]

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[EinfachHans]

I created a minimal repo with two selects, one has a smaller font size: https://github.com/EinfachHans/ionic-label-bug

[EinfachHans]

And here is a stackblitz, guess that's quicker to check out: https://github-1mgkjv-ctghgu.stackblitz.io

[amandaejohnston]

Thank you, I'm able to replicate this. While the label floats into the correct position when the input/select is focused, it sits vertically off-center otherwise.

[muuvmuuv]

I have kind of a similar issue our label also "moves" because once the ion-input is clicked it changes its inner HTML structure...

Before

After

[thetaPC]

I'm also experiencing this when using ion-select inside an item and outside.

If the ion-select is inside a list, then the label is completely gone. If it's not inside a list, then the label is shifted down.

Code Snippet:

<ion-list>
  <ion-item>
    <ion-select label="Floating label" label-placement="floating">
      <ion-select-option value="apple">Apple</ion-select-option>
      <ion-select-option value="banana">Banana</ion-select-option>
      <ion-select-option value="orange">Orange</ion-select-option>
    </ion-select>
  </ion-item>
</ion-list>
<ion-select label="Floating label" label-placement="floating">
  <ion-select-option value="apple">Apple</ion-select-option>
  <ion-select-option value="banana">Banana</ion-select-option>
  <ion-select-option value="orange">Orange</ion-select-option>
</ion-select>

Here's a screenshot:

[maudvd]

The same thing happens when you change the min-height property of the ion-input

[sebowilli]

Any updates here or plans of integrating this in one of the next releases? I really like the feature of having a floating label on the input but it stops me from applying any customization on the font. Changing font-size and/or font-family are both messing up the layout. As an example for font-family, I was trying to change it to Open Sans instead of the default font.

[mapsandapps]

It does seem like both Input and Select could be improved by using the suggestions up-thread, plus adjusting the transitions. However, this does not seem to solve the problem @thetaPC found. We'll need to do additional work to understand that issue.

To fix the original issue, we can add this to Input & Select, as in my draft PR: #28446:

When the stacked & floating .label-text-wrapper has focus or a value:

@include transform(translateY(-50%), scale(1));
top: 50%;
transition: color 150ms cubic-bezier(0.4, 0, 0.2, 1), transform 150ms cubic-bezier(0.4, 0, 0.2, 1), top 150ms cubic-bezier(0.4, 0, 0.2, 1);

When the stacked & floating .label-text-wrapper is not focused and does not have a value:

top: 0;