Question

I have text boxes where id for these boxes are from 1 to 20. These boxes are created in PHP for loop.
How can i check using javascript if these textboxes are empty. and throw an error on each box.

foreach(i = 0, i<20, i++)
{
<input type = "Text" id="q_i">
}

Answer 1

Use jQuery?

$('input[type=text]').each(function(){if ($(this).val() == '') alert("Your Message Here");});  

or, if there are other inputs you don’t want to process:

$('[id^="q_"]').each(function(){if ($(this).val() == '') alert("Your Message Here");});