javascript-polymerHow do I use Javascript and Polymer together to create a web app?

Using Javascript and Polymer together to create a web app is a powerful combination. Polymer is a library of web components that can be used to create modern web applications. To use them, you need to include the Polymer library in your HTML file:

<script src="https://unpkg.com/@polymer/polymer/polymer-legacy.html"></script>

You can then create custom web components using the Polymer library. For example, here is a simple component that displays a greeting:

<dom-module id="my-element">
  <template>
    <h2>Hello, <span>{{name}}</span></h2>
  </template>
  <script>
    Polymer({
      is: 'my-element',
      properties: {
        name: String
      }
    });
  </script>
</dom-module>

The code above creates a custom element called my-element that can be used in the HTML. To use this element, you need to register it with the Polymer library:

<script>
  window.addEventListener('WebComponentsReady', function() {
    Polymer({is: 'my-element'});
  });
</script>

You can then use the element in the HTML like this:

<my-element name="World"></my-element>

This would display the greeting Hello, World on the page.

You can use Javascript to interact with the elements and manipulate the DOM. For example, if you wanted to change the greeting when a button is clicked, you could do this:

<script>
  document.querySelector('my-element').name = 'Foo';
</script>

This would change the greeting to Hello, Foo when the button is clicked.

Using Javascript and Polymer together, you can create powerful and interactive web apps.

Code explanation

1. <script src="https://unpkg.com/@polymer/polymer/polymer-legacy.html"></script> - This line includes the Polymer library in the HTML file.
2. <dom-module id="my-element"> - This creates a custom web component called my-element.
3. <template> - This is the template for the element. It contains the HTML that will be displayed on the page.
4. <script> - This is where the Javascript code for the element goes.
5. Polymer({ is: 'my-element', properties: { name: String } }); - This registers the element with the Polymer library.
6. window.addEventListener('WebComponentsReady', function() { Polymer({is: 'my-element'}); }); - This registers the element with the Polymer library.
7. <my-element name="World"></my-element> - This uses the element in the HTML.
8. document.querySelector('my-element').name = 'Foo'; - This changes the greeting when a button is clicked.

Helpful links

• Polymer Project
• Web Components
• Using Polymer with Javascript

Edit this code on GitHub