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From Rob Audenaerde <rob.audenae...@gmail.com>
Subject Re: FileUploadField with AJAX Behavior
Date Thu, 24 Aug 2017 09:38:25 GMT
I use this home brew Behavior:

import java.io.File;

import org.apache.wicket.Component;
import org.apache.wicket.ajax.AbstractDefaultAjaxBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.OnDomReadyHeaderItem;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.http.WebRequest;
import org.apache.wicket.util.string.StringValue;

public abstract class FileSelectedBehavior extends
AbstractDefaultAjaxBehavior
{
public static final String FILE_SELECTED_REQUEST_PARAMETER_NAME = "val";

@Override
public void respond( AjaxRequestTarget target )
{
// get the web request
RequestCycle cycle = RequestCycle.get();
WebRequest webRequest = (WebRequest) cycle.getRequest();

// get the parameter
StringValue term = webRequest.getQueryParameters().getParameterValue(
FILE_SELECTED_REQUEST_PARAMETER_NAME );

// term contains full (fake) path
File file = new File( term.toString() );

// process the parameter
this.processRequest( target, file.getName() );
}

/**
* This method will be called when a file is selected.
*
* @param target
* @param fileName will contain the filename with extension (without path)
*/
public abstract void processRequest( AjaxRequestTarget target, String
fileName );

@Override
public void renderHead( Component component, IHeaderResponse response )
{
// after selecting a file the onRequest of this class is called
String script = "document.getElementById('" + component.getMarkupId() +
"').onchange = function () {  Wicket.Ajax.get({ 'u' : \""
+ this.getCallbackUrl() + "\", 'ep' : {'" +
FILE_SELECTED_REQUEST_PARAMETER_NAME + "' : this.value } });};";

// add the javascript
response.render( OnDomReadyHeaderItem.forScript( script ) );
}
}

On Thu, Aug 24, 2017 at 9:57 AM, lucast <lucastoledo@hotmail.com> wrote:

> I had the same requirement,I wanted to display the contents of the file,
> once
> the file has been selected.
> I found the code on
> https://github.com/apache/openmeetings/blob/4a5e859f886253086e51a2ac26bbc5
> 01d621e590/openmeetings-web/src/main/java/org/apache/
> openmeetings/web/common/UploadableImagePanel.java
> <https://github.com/apache/openmeetings/blob/
> 4a5e859f886253086e51a2ac26bbc501d621e590/openmeetings-web/
> src/main/java/org/apache/openmeetings/web/common/UploadableImagePanel.java
> >
> , line 77, new AjaxFormSubmitBehavior(form, "change") to be extremely
> helpful and just what I was looking for.
>
>
>
>
> --
> View this message in context: http://apache-wicket.1842946.
> n4.nabble.com/FileUploadField-with-AJAX-Behavior-tp4677874p4678594.html
> Sent from the Users forum mailing list archive at Nabble.com.
>
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