Confusing Vaadin Component Styling Dilemma

Question

Confusing Vaadin Component Styling Dilemma

I've been struggling to access the individual parts of elements that require navigating through the shadow DOM. I've been following a guide for assistance: https://github.com/vaadin/vaadin-themable-mixin/wiki/1.-Style-Scopes

When I add this code to my shared-styles.html file, everything works smoothly:

vaadin-text-field {
  border: 1px solid gray;
}

However, when it comes to styling specific parts of the element, the guide suggests doing it like this:

#shadow-root (open)
  <style>
    :host {
      border: 1px solid gray;
    }
  </style>

Furthermore, it mentions that you can style specific parts (such as input-field) like so:

#shadow-root
  <style>
    [part="input-field"] {
      border: 1px solid gray;
    }
  </style>

However, I'm having trouble understanding how the last 2 code blocks are supposed to target 'vaadin-text-field' since it's not explicitly mentioned in the snippets. Just adding those code snippets on their own doesn't seem to work. It feels like I might be missing something simple. Thank you for any assistance provided - the support available for Vaadin is truly appreciated!

java css vaadin styling

Answer 1

Answer №1

For more information on styling Vaadin components using Stylable Shadow Parts, you can refer to the documentation provided here.

In a nutshell, to apply custom styles to a Vaadin component like <vaadin-text-field>, you'll need to insert your styles into the shadow DOM of the component. This involves creating a style module with a theme-for="vaadin-text-field" attribute and defining your custom styles within it. Prior to rendering, Vaadin components search for style modules with the theme-for attribute and extract styles from there.

<dom-module id="my-input-theme" theme-for="vaadin-text-field">
  <template>
    <style>
      [part="input-field"] {
        border: 1px solid gray;
      }
    </style>
  </template>
</dom-module>

<vaadin-text-field label="Username"></vaadin-text-field>

Here is a live demonstration illustrating this concept:

The example showcased above alters the styles of all instances of <vaadin-text-field> within the application. If you wish to target specific text fields for styling, consider employing a theme or an attribute selector:

<dom-module id="my-input-theme" theme-for="vaadin-text-field">
  <template>
    <style>
      :host([theme~="bordered"]) [part="input-field"] {
        border: 3px solid hotpink;
      }
    </style>
  </template>
</dom-module>

<vaadin-text-field label="Themed" theme="bordered"></vaadin-text-field>

Answer 2

For more information on styling Vaadin components using Stylable Shadow Parts, you can refer to the documentation provided here.

In a nutshell, to apply custom styles to a Vaadin component like <vaadin-text-field>, you'll need to insert your styles into the shadow DOM of the component. This involves creating a style module with a theme-for="vaadin-text-field" attribute and defining your custom styles within it. Prior to rendering, Vaadin components search for style modules with the theme-for attribute and extract styles from there.

<dom-module id="my-input-theme" theme-for="vaadin-text-field">
  <template>
    <style>
      [part="input-field"] {
        border: 1px solid gray;
      }
    </style>
  </template>
</dom-module>

<vaadin-text-field label="Username"></vaadin-text-field>

Here is a live demonstration illustrating this concept:

The example showcased above alters the styles of all instances of <vaadin-text-field> within the application. If you wish to target specific text fields for styling, consider employing a theme or an attribute selector:

<dom-module id="my-input-theme" theme-for="vaadin-text-field">
  <template>
    <style>
      :host([theme~="bordered"]) [part="input-field"] {
        border: 3px solid hotpink;
      }
    </style>
  </template>
</dom-module>

<vaadin-text-field label="Themed" theme="bordered"></vaadin-text-field>

Answer 3

Answer №2

To implement the final examples, you will need to make changes directly within the style-tag of the component.

If you scroll down on that particular page, you'll come across a Read next: Guide to Adding Styles to Local Scope.

Answer 4

To implement the final examples, you will need to make changes directly within the style-tag of the component.

If you scroll down on that particular page, you'll come across a Read next: Guide to Adding Styles to Local Scope.

Confusing Vaadin Component Styling Dilemma

Answer №1

Answer №2

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