Print List Item With InfoPath Form

As we all know,if we change display form of a list item to infopath form,there can't find the print preview button on the ribbon:

If we want to print this form, we need to add a print button,but how to do it,just follow the following steps:

First,trun back to the list,on the ribbon area,click "List"-"Modify Form Webparts",choose "(Item) Display Form":

Then,click "Add Webpart" on the page area,select "Media and Content"-"Content Editor Webpart",click "Add":

Then,modify the content editor webpart,click "Modify Html Code":

Add the following code:

<script src="/_layouts/jquery.min.js" type="text/javascript"></script>
<script src="/_layouts/jquery.PrintArea.js" type="text/javascript"></script>

<script type="text/javascript">
$(document).ready(function () {
    $("#print_button").click(function(){
        $("#WebPartWPQ2").printArea();
    });
});
</script>
<input id="print_button" type="button" value="打 印"/> 

Before we do this,we should add "jquery.min.js" and "jquery.PrintArea.js" to this folder on SharePoint Server:"C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\LAYOUTS\","jquery.PrintArea.js" can be downloaded from the internet.

"WebPartWPQ2" is the area id we want to print.