Javascript download multiple files with iframe

Question

I need to download multiple files with one button "download all",I don't want to zip them, i want to download them with javascript and hidden iframe,how I can do it? here is the example with iframe and javascript ,but I don't understand what url I need to send to ifrm.setAttribute( "src", url ) ;What is 'somefile.do'?

function makeFrame( url ) 
{ 
    ifrm = document.createElement( "IFRAME" ); 
    ifrm.setAttribute( "style", "display:none;" ) ;
    ifrm.setAttribute( "src", url ) ; 
    ifrm.style.width = 0+"px"; 
    ifrm.style.height = 0+"px"; 
    document.body.appendChild( ifrm ) ; 
}  

function downloadChecked( )
{
    for( i = 0 ; i < document.downloadform.elements.length ; i++ )
    {
        foo = document.downloadform.elements[ i ] ;
        if( foo.type == "checkbox" && foo.checked == true )
        {
            makeFrame('somefile.do?command=download&fileid=' + foo.name );
        }
    }
}

Answer 1

You need to pass direct file URL (or URL which cause direct downloading) into iframe src. In your script case, somefile.do is probably some download handler and file ID and action is passed by it's parameters.

But back to your question, if you have files:

• example.com/file1.zip
• example.com/file2.zip
• example.com/file3.zip

You have to pass it just into makeFrame function as a parameter:

makeFrame('http://example.com/file1.zip');

It will create iframe for every URL and start downloading (or display save dialog - depends on browser). Make sure to have files URLs in array and pass them in for loop.