Guide on adjusting the placement of mat-select-panel in Angular Material

In my current project, I am utilizing Angular Material Components and have been working on customizing mat-select. My goal is to make the select input appear like a dropdown similar to the native HTML select. I have managed to achieve a good effect using only CSS styles, but have encountered an issue.

The problem arises when the appearance of my mat-select varies based on the size of the browser window. Specifically, there are instances where the mat-form-field and mat-select-panel do not align properly (their left sides are not in line) which is unacceptable for the project.

Here is how it should look (example: Firefox browser, window size 100%): https://i.sstatic.net/ruDku.png

And here is what needs fixing (example: Firefox browser, window size 90%): https://i.sstatic.net/c6PUN.png

My analysis of why this is happening: The mat-select-panel has a position absolute that is dependent on the cdk-overlay-panel's dynamic positioning calculation. Sometimes, fractional width and height values get truncated, causing a one-pixel difference between mat-form-field and mat-select-panel. Here is an example:

https://i.sstatic.net/M08jH.png

What I aim to achieve: I am seeking a solution to ensure that my input always maintains a visually pleasing appearance regardless of the browser window size. The alignment between mat-form-field and mat-select-panel must always remain straight.

You can view the Stackblitz for my input here.

javascriptcssangulartypescriptangular-material

Answer №1

Impressed by the meticulous attention to detail in your observation... I've encountered a similar customer with such keen insight :) ... upon reviewing your stackblitz, we identified a significant issue that requires resolution:

https://i.sstatic.net/jEdMg.png

Your CSS was commented out 

.container>*{   position: absolute;   top: 30vh;   left: 30vw; }
and replaced with the following code snippet to observe misalignment when zooming in/out on the browser: 

.myMatOptions{  position: absolute;  top: 30vh;  left: 30vw; }
::ng-deep .cdk-overlay-container{left: 30vw;}
::ng-deep .cdk-overlay-pane { left:0 !important; transform:none !important;}
::ng-deep .mat-select-panel{left: 0}

At an 80% zoom level, the following issues were observed: https://i.sstatic.net/FwLsE.png

At a 90% zoom level, there is a slight misalignment in the rendered output: https://i.sstatic.net/jY64s.png

At a 100% zoom level, everything appears correctly aligned: https://i.sstatic.net/7Dilq.png

At a 110% zoom level, there is a minor misalignment in the rendered output: https://i.sstatic.net/ssoWH.png

At a 125% zoom level, there are no alignment issues: https://i.sstatic.net/iViA6.png

These minor visual discrepancies (at 90% and 110%) appear in the rendered output - the underlying CSS is correct, indicating no fundamental issues to address. View working stackblitz here

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