# Prefetching

You can prefetch an action's results on mouseOver using the `.prefetch` modifier. 

```xml
// File: ./views/wires/movie.cfm
<div>
    <button wire:click.prefetch="togglePreview">Show Preview</button>

    <cfif args.showPreview>
        <!-- Preview goes here -->
    </cfif>
</div>
```

```javascript
// File: ./wires/Movie.cfc
component extends="cbwire.models.Component"{

    variables.data = {
        "showPreview": false
    };

    function togglePreview(){
        variables.data.contentIsVisible = true;
    }
    
    function renderIt(){
        return this.renderView( "wires/movie" );
    }
}
```

{% hint style="success" %}
In the example here, cbwire will invoke ( prefetch ) the `togglePreview` action when the user mouses over the button. The results of the fetch are not displayed until the user clicks the 'Show Preview' button.
{% endhint %}

{% hint style="warning" %}
Prefetching works well for actions that do not perform any side effects, such as mutating session data or writing to a database. If the action you are "pre-fetching" does have side effects, you may encounter unpredictable results.
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://cbwire.ortusbooks.com/cbwire-v1/templates/prefetching.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.