Mail a screenprint in Oracle APEX

We always build bug-free applications (hehe), but in the extremely rare occasion that the user encounters a bug, they always seem to use words like “it doesn’t” work and nothing more than that.

Well, I like to have more information, so on our site we wanted the user to be able to send some background info and a screen print from within the system.

Personally I like the Team Development framework but for our purpose we needed some lightweight solution. And sending a screen print should be cool, right?

Well, most of the heavy lifting of creating a screen print is done by the library HTML2Canvas

I included an “I want to report a problem” link in the navigation bar entries with an URL-target


The javascript function that is called is the following:

function getScreen() {
  if (!!document.createElement("canvas").getContext) {
    html2canvas(window.document.body, {
      onrendered: function(canvas) {
      var dataUrl = canvas.toDataURL("image/jpeg");
      var clobObj = new apex.ajax.clob(
          if (p.readyState == 4){
            var get = new htmldb_Get(null,$v('pFlowId')
            gReturn = get.get();
            alert('Mail has been send');
        clobObj._set(dataUrl );      
  } else {
    var get = new htmldb_Get(null,$v('pFlowId')
    gReturn = get.get();
    alert('Mail has been send');

Notice that I check if canvas is supported by the browser. If it isn’t supported we’re not able to create a screenshot and we just send some background information. When canvas is enabled I put the output string in the CLOB_CONTENT-collection.

On our site we are sending the mail to our customer to let them be able to give some more background information. But you could of course also navigate to a new page for that or just email the information directly to you.

The On Demand process handles the mailing part.

  cursor c_variables
    select item_name||' : '
    || apex_util.get_session_state(item_name) AS session_value
    from   apex_application_page_items
    where  application_id = :APP_ID
    and    page_id        = :G_CURRENT_PAGE
    select item_name||' : '
    || apex_util.get_session_state(item_name) 
    from   apex_application_items
    where  application_id = :APP_ID
  l_id   number;
  l_blob blob;
  l_clob clob;
  l_body clob;
  l_body := to_clob(:APP_USER||', please give some more information before sending it to us'||utl_tcp.crlf);
  l_body := l_body||utl_tcp.crlf;  
  for r_variable in c_variables
    if ( c_variables%ROWCOUNT = 1 ) 
      l_body := l_body||'Page variables in session state: '||utl_tcp.crlf;  
    end if;
    l_body:= l_body||r_variable.session_value||utl_tcp.crlf;
  end loop;
  /* Add the screen print */
  FOR r_coll IN 
    ( SELECT coll.clob001
      FROM   apex_collections coll
      WHERE  coll.collection_name = 'CLOB_CONTENT'
      ( dest_lob   => l_clob
      , src_lob    => r_coll.clob001
      , amount     => dbms_lob.getlength(r_coll.clob001)
      , src_offset => dbms_lob.instr(r_coll.clob001,',',1,1)+1
    l_blob := apex_web_service.clobbase642blob(l_clob);
  end loop;
  l_id:= apex_mail.send
      ( p_to  => :app_user||''
      , p_from => ''
      , p_subj => 'Issue for application '
                 ||:APP_ID||' Page '||:APP_PAGE_ID
      , p_body => l_body
  if dbms_lob.getlength(l_blob) > 0
     ( p_mail_id    => l_id
     , p_attachment => l_blob
     , p_filename   => 'screenprint.jpg'
     , p_mime_type  => 'image/jpeg'
  end if;

And again, that’s it!


5 thoughts on “Mail a screenprint in Oracle APEX

    • Thanks,
      Je hebt van de site de html2canvas.js nodig.
      Daarnaast dien je op iedere page de library op te nemen.
      Bijvoorbeeld door een tag op te nemen in een region op page 0.

      Kijk ook eens op het APEX forum. Daar zijn genoeg voorbeelden te vinden voor het linken van externe javascript libraries.

  1. Hello!

    Thank you for the post.

    I don’t know what I’m doing wrong, but I couldn’t make it work.
    I am new to the Oracle Apex and never programmed in JavaScript, but I’m trying some things seeking tips on the Internet.

    I do not want to bother you, but could you give me a little help?

    Actually my need is to save this screenshot, the part of the whole body or just the selected regions as PDF, but I think your post has help me to get close.

    1st – I downloaded the html2canvas.js and added on images/javascript.

    2nd – I created a getScreen.js file with the same code you’ve written and added in images/javascript.

    3rd – I created the On Demand process in my application.

    4th – I created a button calling the URL, but when I press the button, nothing happens. When inspecting the element by the browser, it appears an error not finding the getScreen.js.

    Could you help me, if there was any bother to you?

    Thank you so much.

  2. Look at your sourcecode if the link to images/javascript/getscreen.js is found and loaded.
    You could also test this by including the getscreen function into the header of the page (javascript> Function and Global declaration)

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