单击按钮时打印页面不起作用

Question

I created a PHP page to print invoice of my project. I need to print this page automatically after saving my invoice. I used jquery $.post method to open print.php page,

Save invoice button

$.post("print.php",{
    desc: $desc,
    }, function(data,success){
    alert(success);
});

and i used javascript window.onload = function(){window.print();} in print.php page. but its not working, nothing printing. Then i open print.php page in browser and it was printed as i want.I don't need to redirect to print.php page. Is there anything wrong in my code. How to print this page ?

Edit

I don't need to save or get result from this $.post . I just need to print invoice with desc data.

Answer 1

Problem:The page is not loading so window.onload will not work.This is because you have posted with ajax. Solution:Try posting the invoice details by using a form.

Answer 2

Try chaining a done() after the post() .

$.post( "print.php", { desc: invoiceData })
   .done(function( data ) {
       alert( "Success: " + data );
});

Heads up!

Alert the results from requesting print.php using done() instead of success() because: The jqXHR.success() , jqXHR.error() , and jqXHR.complete() callback methods are removed as of jQuery 3.0. You can use jqXHR.done() , jqXHR.fail() , and jqXHR.always() instead.

Answer 3

If you just want to print the response of ajax then use below code.

$.post("print.php",{
        desc: $desc,
    }, function(data,success){
        alert(success);
        w=window.open(null, 'Print_Page', 'scrollbars=yes'); 
        w.document.write(data); //where data = response of print.php, the invoice
        w.document.close();
        w.print();
    }
);

NOTE : I'm assuming that if I open print.php in browser then I will get the invoice in a human readable manner, either a raw text or html whatever you will see by opening print.php in browser that will be printed as it is.