Question

Why don’t work?

var str;

$('table tr').each(function() {
    str = $(this).find('td').eq(6).html().trim().substring(10, 20);
    $(this).find('td').eq(6).text(str);
});

Need write in all 6th trim+substring+another_string_action with same value.

Firebug write error: $(this).find(“td”).eq(6).html() is null

Answer 1

Two things.

First, remember that not all browsers have a native .trim() function. Safer to use jQuery’s $.trim().

• http://api.jquery.com/jquery.trim/

Second, remember that .eq() takes a 0 based index, so if you want the sixth <td> column, pass 5. Right now you’re asking for the seventh <td>.

var str;

$('table tr').each(function() { 
    var $td = $(this).find('td').eq(5); // Get sixth <td> in the row
    str = $.trim( $td.html() ).substring(10, 20);
    $td.text(str);
});