Why jquery have problem with onbeforeprint event?

Question

Hi all,

I have the following function.

$(function() {
    $(".sectionHeader:gt(0)").click(function() {
        $(this).next(".fieldset").slideToggle("fast");
    });
    $("img[alt='minimize']").click(function(e) {
        $(this).closest("table").next(".fieldset").slideUp("fast");
        e.stopPropagation();
        return false;
    });
    $("img[alt='maximize']").click(function(e) {
        $(this).closest("table").next(".fieldset").slideDown("fast");
        e.stopPropagation();
        return false;
    });
});

<script type="text/javascript">
     window.onbeforeprint = expandAll;

     function expandAll(){
       $(".fieldset:gt(0)").slideDown("fast");
      }
</script>

For this html

    <table class="sectionHeader" ><tr ><td>Heading 1</td></tr></table>
     <div style="display:none;" class="fieldset">Content 1</div>

 <table class="sectionHeader" ><tr ><td>Heading 2</td></tr></table>
     <div style="display:none;" class="fieldset">Content 2</div>

I have several div class="fieldset" over the page, but when I do print preview or print, I can see all divs sliding down before opening the print preview or printing but on the actual print preview or print out they are all collapse.

I would appreciate if anyone comes with a solution for this.

Anyone have any idea why is this or how to fix it?

Thanks.

PS:Using a does not work either ( I assume because jquery using toggle) and its not the kind of question I am looking for.

Answer 1

An easier way to do this is in the CSS, you can have different styles for printing vs the screen like this:

@media print {
  .fieldset { display: block; }
}

@media screen {
  .fieldset { display: none; }
}

The .fieldset class will display when printing, but not by default in the browser. Be sure to take out your in-line diplay: none styles on .fieldset divs in the page, as they'll override either of these in a CSS file.

Answer 2

Hi Cesar, I would like to strongly suggest to you not to use this technology for printing. You need to rely on a setup that works without javascript for printing.

Although the method you are going for can be marked as clever although using:

<style type="text/css" media="print">  css to modify for print  </style>

Will ensure that you get your expanded panels for print even without javascript.