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# YUI Library Examples: Selector Utility: Using query

# Selector Utility: Using query

Clicking the button will add a red border to all of the LI elements with the class of "selected" that live in a UL.

View example in new window.

- lorem
- ipsum
- dolor
- sit

- lorem
- ipsum
- dolor
- sit

- lorem
- ipsum
- dolor
- sit

1. lorem
2. ipsum
3. dolor
4. sit

## Using query

The query method, part of the YUI Selector Utility, makes it easy to retrieve an array of elements based on a CSS3 Selector.

To illustrate the use of query, we'll create a few HTML lists. When the button is clicked, we will add a red border to all `LI`s that are descendants of `UL`s, and have the class `selected` applied.

Add some markup for the lists and a button to trigger the demo:

<ul> <li class="selected">lorem</li> <li>ipsum</li> <li>dolor</li> <li>sit</li> </ul> <ul> <li>lorem</li> <li class="selected">ipsum</li> <li>dolor</li> <li>sit</li> </ul> <ul> <li>lorem</li> <li>ipsum</li> <li>dolor</li> <li class="selected">sit</li> </ul> <ol> <li>lorem</li> <li>ipsum</li> <li>dolor</li> <li class="selected">sit</li> </ol> <button id="demo-run">run</button>

Now we will define the function that adds the border when the button is clicked, and assign it as a click handler.

<script type="text/javascript"> var handleClick = function(e) { var nodes = YAHOO.util.Selector.query('ul li.selected'); YAHOO.util.Dom.setStyle(nodes, 'border', '1px solid red'); }; YAHOO.util.Event.on('demo-run', 'click', handleClick); </script>

This is a simple example of how to use the `Selector.query` method.

## Configuration for This Example

You can load the necessary JavaScript and CSS for this example from Yahoo's servers. Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured.

### YUI Logger Output:

Note: You are viewing this example in debug mode with logging enabled. This can significantly slow performance.

Reload with logging
and debugging disabled.

### Selector Utility Examples:

- Using query
- Using filter
- Complex Application (included with examples for Layout Manager)

### More Selector Utility Resources:

- User's Guide (external)
- API Documentation
- Cheat Sheet PDF (external)

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