Polymer Practice Exercises: Essential Techniques for Mastering the Framework

Here is a short practice on Polymer:

  1. Create an HTML file with a script tag that includes the Polymer library.
phpCopy code<!DOCTYPE html>
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/polymer/3.0.5/polymer-legacy.min.js"></script>
  </head>
  <body>
  </body>
</html>
  1. Create a custom element to display a message. In this example, we will create a custom element called my-message that displays a message passed as a property.
phpCopy code<!-- my-message.html -->
<dom-module id="my-message">
  <template>
    <style>
      :host {
        display: block;
        padding: 16px;
        background-color: #eee;
        border: 1px solid #ddd;
        border-radius: 4px;
      }
    </style>
    <div>{{message}}</div>
  </template>

  <script>
    class MyMessage extends Polymer.Element {
      static get is() { return 'my-message'; }
      static get properties() {
        return {
          message: {
            type: String,
            value: 'Hello World!'
          }
        };
      }
    }

    customElements.define(MyMessage.is, MyMessage);
  </script>
</dom-module>
  1. Use the custom element in your HTML. In this example, we will use the my-message element to display a message.
phpCopy code<!-- index.html -->
<!DOCTYPE html>
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/polymer/3.0.5/polymer-legacy.min.js"></script>
    <link rel="import" href="my-message.html">
  </head>
  <body>
    <my-message message="Hello Polymer!"></my-message>
  </body>
</html>

This is a simple example of how to create and use a custom element using Polymer. You can find more information about Polymer and its features in the documentation.

Tags: No tags

Add a Comment

Your email address will not be published. Required fields are marked *