---
title: "Uploader.BeforeUpload Event ActiveX/Java Uploader "
canonical: https://www.aurigma.com/docs/us8/JA_E_Uploader_BeforeUpload.htm
product: "Upload Suite 8"
---

# Uploader.BeforeUpload Event ActiveX/Java Uploader 

Supported browsers: ![Internet Explorer](https://www.aurigma.com/docs/us8/icons/ie8.png)![Firefox](https://www.aurigma.com/docs/us8/icons/firefox.png)![Google Chrome](https://www.aurigma.com/docs/us8/icons/chrome.png)![Safari](https://www.aurigma.com/docs/us8/icons/safari.png)
 
This event fires when the upload is about to be started.

## Syntax
 
```aspx-cs
<script type="text/javascript">
function Uploader1_BeforeUpload(){
    //...your code...
}
</script>
```

```
<aur:Uploader ID="Uploader1" runat="server">
    <ClientEvents>
        <aur:ClientEvent EventName="BeforeUpload" HandlerName="Uploader1_BeforeUpload" />
    </ClientEvents>
</aur:Uploader>
```
 
```
<script type="text/javascript">
function Uploader1_BeforeUpload(){
    //...your code...
}
</script>
```

```
<?php
    $Uploader = new Uploader("Uploader1");
    //...other params...
    $Uploader->getClientEvents()->setBeforeUpload("Uploader1_BeforeUpload");
    //...other params...
    $Uploader->render();
?>
```
 
```
function Uploader1_BeforeUpload(){
    //...your code...
}
```

```
$au.uploader({
    events: {
        //...other params...
        beforeUpload: [Uploader1_BeforeUpload],
        //...other params...
    }
})
```
 
### Return Value
 
Type: **Boolean**
 
If `false` (or zero), the upload is cancelled. Otherwise, upload begins immediately after the event handler finishes. This makes the event handler convenient for validating additional data provided by a user.

## See Also
 
### Reference
 
- BeforeUpload Property[BeforeUpload (PHP)](https://www.aurigma.com/docs/us8/JA_P_P_ClientEvents_BeforeUpload.htm.md)[beforeUpload (JavaScript)](https://www.aurigma.com/docs/us8/JA_P_J_$au_events_beforeUpload.htm.md)

### Manual
 
- [Using Events](https://www.aurigma.com/docs/us8/using-javascript-api.htm.md)