How come the CSS for my angular ngx-mat-datetime-picker and mat-datepicker collide when they are both present on the same page?

Within the same form, I have two input fields stacked under each other. One is an ngx-mat-datetime-picker and the other is a mat-datepicker. Individually, they function correctly. However, when I open them for the second time, the one I opened first appears with distorted CSS.

Here's the code snippet:

<div class="row">
    <div class="col-3">
        <mat-form-field appearance="outline">
            <mat-label>Schlusstag</mat-label>
            <input matInput [ngxMatDatetimePicker]="schlusstag" placeholder="schlusstag"
                [formControl]="fc.schlusstag" />
            <mat-datepicker-toggle matSuffix [for]="schlusstag"></mat-datepicker-toggle>
            <ngx-mat-datetime-picker #schlusstag></ngx-mat-datetime-picker>
        </mat-form-field>
    </div>
</div>
<div class="row">
    <div class="col-3">
        <mat-form-field appearance="outline">
            <mat-label>Valuta</mat-label>
            <input matInput [formControl]="fc.valuta" placeholder="Valuta" maxlength="10" [matDatepicker]="valuta"
                autocomplete="off" />
            <mat-datepicker-toggle matSuffix [for]="valuta"></mat-datepicker-toggle>
            <mat-datepicker #valuta></mat-datepicker>
        </mat-form-field>
    </div>
</div>

Scenario 1: I open the ngx-mat-datetime-picker, select a date, then click apply. Next, I open the mat-datepicker, select a time, and everything functions properly. However, upon reopening the ngx-mat-datetime-picker, it displays incorrectly as shown in this image:https://i.sstatic.net/wSJxn.png.

Scenario 2: After selecting a value using the mat-datepicker, I open the ngx-mat-datetime-picker and make another selection. Upon returning to the mat-datepicker, its CSS is disrupted as depicted here:https://i.sstatic.net/i8jHb.png.

I have not encountered any errors in the console and am uncertain why their CSS interferes with one another.

Answer №1

When using @angular/material@^16, a set of CSS rules is applied to the globalThis.document.styleSheets when the first component of an Angular app is initiated, typically after the first click on a component.

The correct presentation of a component depends on these CSS rules. However, the stylesheets pushed onto globalThis.document.styleSheets during the first instantiation of a component do not include copies or equivalents of certain essential rules. This omission leads to the issue at hand.

A workaround for this problem is to copy these missing rules into a global stylesheet within the host Angular app.

.mat-datepicker-toggle {
    pointer-events: auto;
    color: var(--mat-datepicker-toggle-icon-color);
}
...
[dir='rtl'] .mat-calendar-body-label {
    text-align: right;
}

Answer №2

Recently encountered a snag in my Angular 14 project while using

@angular-material-components/datetime-picker
v8

After checking out the discussion on the related github issue, found some suggested solutions. I applied the following CSS style which seemed to resolve the problem:

mat-calendar .mat-calendar-body-cell {
    height: 100%;
    position: absolute;
}

Answer №3

The reason for this issue is that each of the datepickers brings its own CSS, and if they share the same class, the one loaded later will overwrite the styles of the first one. To address this problem, you can consider the following solutions:

  1. Opt for a single datepicker library
  2. Avoid using multiple datepickers within the same component
  3. Assign a unique class to your component utilizing the datepicker and apply
    ::ng-deep your-class datepicker-class-is-override
    to customize the CSS for the overridden class

Using just one datepicker throughout your application is advised as it minimizes such conflicts.

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