Issue: I am struggling to make CSS changes only affect the specific component I want, without impacting other elements on the page. My goal is to style my dropdown menu without affecting other text input fields:
Background/Challenge: While I understand why the styling would apply to all similar items within the same page (mat-form-field's), I'm puzzled as to why it extends to affect other pages as well. I have tried to investigate this issue but remain uncertain about the cause.
Approach Taken: In one instance, I had implemented the following CSS code:
::ng-deep .mat-form-field-appearance-outline .mat-form-field-flex {
height: 40px !important
}
::ng-deep .mat-form-field-infix {
padding-top: 1px !important;
padding-bottom: 2px !important;
}
However, this ended up modifying the spacing of all form-fields on the page, prompting me to revise it as follows:
::ng-deep .mat-form-field-appearance-outline .mat-form-field-flex {
height: 40px !important
}
::ng-deep .mat-form-field-appearance-outline .mat-form-field-infix {
padding-top: 1px !important;
padding-bottom: 2px !important;
}
Other sections of unchanged CSS include:
.title-container {
position: relative;
margin-top: 8px;
}
.language-field {
position: absolute;
right: 0;
top: 0;
margin-top: -16px;
width: 115px;
height: 20px !important;
}
Although this revision addressed the issue, I find it perplexing that altering the login.component.css impacts other pages like profile.component.css
Below is the HTML associated with the login.component:
<div class="title-container">
<mat-card-title class="text-center">
Please Sign In
</mat-card-title>
<form [formGroup]="_siteForm">
<mat-form-field class="language-field" appearance="outline">
<mat-select (selectionChange)="changeSite($event)" [value]="languages[i].value">
<mat-option *ngFor="let language of languages" [value]="language.value">
{{language.viewValue}}
</mat-option>
</mat-select>
</mat-form-field>
</form>
</div>
Research Findings: I came across several Stack Overflow articles (like Angular 2+ : Component style keeps affecting other components) suggesting the use of encapsulation through ViewEncapsulation. However, after examining the project files, I noticed that encapsulation was not explicitly utilized anywhere. Each component had CSS styles referencing mat-form-field with different values, which could imply that encapsulation may not be necessary. I never encountered such issues in regular HTML development, and I am trying to grasp how Angular manages these scenarios. Could this behavior be related to Angular functioning as a Single Page Application (SPA)?