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# Vaadin Core Elements
[](https://gitter.im/vaadin/vaadin-core-elements?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
Vaadin Core Elements is an evolving set of custom HTML elements, built using [Polymer](https://www.polymer-project.org), for building mobile and desktop web applications in modern browsers.
### Examples and Documentation
View live examples and source code side-by-side for individual custom elements.
| Element | Description | Version
| --- | --- | --- |
| [<**vaadin-grid**>](https://github.com/vaadin/vaadin-grid) · [Examples](https://cdn.vaadin.com/vaadin-core-elements/latest/vaadin-grid/demo/) · [API](https://cdn.vaadin.com/vaadin-core-elements/latest/vaadin-grid/) | Data grid for showing large amounts of tabular data. |  |
| [<**vaadin-combo-box**>](https://github.com/vaadin/vaadin-combo-box) · [Examples](https://cdn.vaadin.com/vaadin-core-elements/master/vaadin-combo-box/demo/) · [API](https://cdn.vaadin.com/vaadin-core-elements/master/vaadin-combo-box/) | Filterable select element for a large set of items. |  |
### Installation
We offer three ways to use Vaadin Core Elements in your project: Bower, CDN and ZIP archive. The only difference between the options is the URL you use to import the necessary files into your HTML page.
#### 1. Create a new folder for your project
```shell
$ mkdir my-project
$ cd my-project
```
#### 2. Install Vaadin Core Elements
- ##### Bower
We recommend using [Bower](http://bower.io) for managing your front-end dependencies. Follow the [Bower installation instructions](http://bower.io/#install-bower), then run the following command inside your project folder to install the most recent stable release.
```shell
$ bower install --save vaadin-core-elements
```
This will download Vaadin Core Elements bundle and its dependencies to the `bower_components` folder inside your project's folder.
If you wish to use the development snapshot version of some component, you can install/update that separately:
```shell
$ bower install --save vaadin-grid#master
```
- ##### CDN
You can use Vaadin Core Elements from CDN (see example below). This is especially convenient for services like JSFiddle, Codepen.io, etc.
For example, to import vaadin-grid, use the following URL:
`https://cdn.vaadin.com/vaadin-core-elements/latest/vaadin-grid/vaadin-grid.html`
To import all Vaadin Core Elements, use the following URL:
`https://cdn.vaadin.com/vaadin-core-elements/latest/vaadin-core-elements/vaadin-core-elements.html`
> You can also use the nightly snapshot versions of any component, e.g. https://cdn.vaadin.com/vaadin-core-elements/master/vaadin-grid/vaadin-grid.html
- ##### Download ZIP
1. Download the latest ZIP archive from [vaadin.com/download](https://vaadin.com/download#elements)
2. Extract the archive under your project folder, for example `deps`
#### 3. Create a HTML file
Create a new HTML file inside your project folder and copy the following code into it (choose one of the options how to import Vaadin Core Elements in the `<head>` section):
> **Serving the files during development**, when using Bower or the ZIP archive:
> Due to browser security restrictions, serving HTML imports from a `file:///` URL does not work. You need a web server to view pages where you use custom elements. One simple option is to use the [`serve`](https://www.npmjs.com/package/serve) NPM package.
```html
<!doctype html>
<html>
<head>
<!-- Import Web Component polyfills and all Vaadin Core Elements -->
<!-- CDN -->
<script src="https://cdn.vaadin.com/vaadin-core-elements/latest/webcomponentsjs/webcomponents-lite.min.js"></script>
<link href="https://cdn.vaadin.com/vaadin-core-elements/latest/vaadin-core-elements/vaadin-core-elements.html" rel="import">
<!-- Bower -->
<!-- <script src="bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
<link href="bower_components/vaadin-core-elements/vaadin-core-elements.html" rel="import"> -->
<!-- ZIP archive -->
<!-- <script src="deps/webcomponentsjs/webcomponents-lite.min.js"></script>
<link href="deps/vaadin-core-elements/vaadin-core-elements.html" rel="import"> -->
</head>
<body>
<!-- Use the elements, for instance vaadin-grid -->
<vaadin-grid selection-mode="multi">
<table>
<!-- Define the columns -->
<col name="index" width="48">
<col name="user.picture.thumbnail" width="54">
<col name="user.name.first">
<col name="user.name.last">
<col name="user.email" flex>
</table>
<!-- Define custom column headers -->
<thead>
<tr>
<th>#</th>
<th></th>
<th>First Name</th>
<th>Last Name</th>
<th>Email</th>
</tr>
</thead>
</vaadin-grid>
<script>
// The Web Components polyfill introduces a custom event we can
// use to determine when the custom elements are ready to be used
document.addEventListener("WebComponentsReady", function () {
// Configure vaadin-grid to show data
// Reference to the grid element
var grid = document.querySelector("vaadin-grid");
// Fetch some JSON data from a URL
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
if (xhr.readyState == XMLHttpRequest.DONE) {
if (xhr.status == 200) {
var json = JSON.parse(xhr.responseText);
// Use the returned data array directly as the data source
// (keeping all the data source items in the browser's memory)
grid.items = json.results;
}
}
}
xhr.open("GET", "http://api.randomuser.me/?results=100", true);
xhr.send();
// Add a renderer for the index column
grid.columns[0].renderer = function(cell) {
cell.element.innerHTML = cell.row.index;
}
// Add a renderer for the picture column
grid.columns[1].renderer = function(cell) {
cell.element.innerHTML = '<img src="' + cell.data + '" style="width: 24px;">';
}
});
</script>
</body>
</html>
```
|
