Changing file name while downloading using script

Hello Experts,

We a requirement to change the file name while downloading. we using “window.open(documentUrl,’_blank’);” in script block to download the file. documentUrl will be something like “https://hostname/download/15082709015510867de0383b6a4d02ae/”. This url we are getting from CSP where the documents are storing. Please suggest, is there any means to change filename using script or java(CAF side).

Thanks in advance,
Niranth

When loading that CSP link directly from the browser, you would have no control over the filename that the target server sends back. That request doesn’t flow through your portlet, it appears to go directly to the CSP server?

Perhaps you can change your code to use a CAF Command Link that acts as a proxy for that target URL. If the request goes though the CAF action, then you can control what filename is sent back.

For example, the java code for the action handler that you bind to the Command Link action property may look something like this:


public String downloadLink_action() {
    try {
        //TODO: get the url you want to download here.
        String url = "https://hostname/download/15082709015510867de0383b6a4d02ae/";
        boolean forceDownload = false; //false to allow the browser to display the content
            
        URLContentExportBean exportBean = new URLContentExportBean(url, forceDownload) {
            /**
             * Override to change the filename that is sent to the client
             */
            @Override
            public getExportFileName() {
                return "my_custom_filename_here";
            }
        };

        streamFileDataToResponse(exportBean);
    } catch (Exception e) {
        error(e);
    }
    return null;
}

For your reference, below are the links to the 9.8 javadocs used in the above example:

Hi Eric Norman,

Thanks for your reply. The thing is we are using the script “window.open(documentUrl,’_blank’);” where documentUrl is the url we are getting it from the CSP. So we cant use command Link control as such. :frowning: Any other suggestion please?

Regards,
Niranth

As I said before, it is impossible for the client-side code to change the filename that the server sends back.

If it is a firm requirement to modify the returned filename, then you must change the documentUrl that you are loading. I already provided an example of one way to do that.

Just to complete the Java code, I don’t know if things have changed in 9.9 but you need to use a URL (and getExportFileName needs a return type, of course):

public String downloadLink_action() {
	try
	{
		URL url = new URL("https://hostname/download/15082709015510867de0383b6a4d02ae/");
		boolean forceDownload = true; //false to allow the browser to display the content  
            
	        URLContentExportBean exportBean = new URLContentExportBean(url, forceDownload) {  
	            /** 
	             * Override to change the filename that is sent to the client 
	             * @return 
	             */  
	            @Override  
	            public String getExportFileName() {  
	                return "my_custom_filename_here";  
	            }  
	        };  
	  
	        streamFileDataToResponse(exportBean);  
	    } catch (Exception e) {  
	        error(e);  
	    }  
	return null;  
}

I also set forceDownload to true, as that seemed to be closer to the original problem.

One last thing - while this works fine for a Command Link/Button/whatever, it does render the page unusable. Is there any way to send the file and leave the page still working?

Hello Niranth,

We had a pretty similar requirement where the file name had to change according to the timestamp with each download.

We declared one string variable e.g. String downloadFileName = null; and created getter and setter for the same.

In the before render response, we wrote this line:

downloadFileName = “export_”+System.currentTimeMillis()+".csv";

Hope this helps.

Regards
Jyoti

Thanks All. It was helpful :slight_smile: