Changing the styling of the :before selector using Angular dynamically

Seeking a method to dynamically label an upload button. Here is my current code snippet:

<style>
   .file_upload_wrap.background_file:before {
    content: {{label}};  /* unfortunately, this does not function as intended */
  } 
</style>

<div class="file_upload_wrap background_file imgFormButton">
    <input type="file" class="file_upload" (change)="uploadFile($event, file)" name="file" id="file" [(ngModel)]="model.file"
      #file="ngModel">
</div>

Any suggestions on how I can dynamically modify the content?

cssangular

Answer №1

To get the value of an attribute, you can utilize the attr css function.

https://developer.mozilla.org/en-US/docs/Web/CSS/attr

component.css

.file_upload_wrap.background_file:before {
    content: attr(data-content);  
}

component.html

<div class="file_upload_wrap background_file imgFormButton" [attr.data-content]="label">
    <input type="file" class="file_upload" (change)="uploadFile($event, file)" name="file" id="file" [(ngModel)]="model.file"
      #file="ngModel">
</div>

Edit: here's a stackblitz example https://stackblitz.com/edit/angular-muysky?file=app%2Fapp.component.ts

Answer №2

If you want to avoid using CSS and the :before selector, one alternative is to insert an additional DOM element before the target div for styling purposes.

<label>{{label}}</label>
<div class="file_upload_wrap background_file imgFormButton">
        <input type="file" class="file_upload" (change)="uploadFile($event, file)" name="file" id="file" [(ngModel)]="model.file"
          #file="ngModel">
    </div>

Answer №3

Utilize the @HostBinding feature to establish CSS variables that can be later applied in your .scss file, simplifying the process of styling elements like :before and :after dynamically.

.ts:

size = 8
padding = 4

@HostBinding('attr.style')
public get dynamicStyles() {
  return `
    --element-size: ${this.size};
    --element-padding: ${this.padding};
    --inner-size: ${this.size - this.padding * 2};
  `;
}

.scss:

.custom-element:before {
  height: calc(var(--element-size) * 2px);
}

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