如果表格行，我将如何隐藏它<td>元素没有两个类之一？

Question

I need to hide all of the rows in a particular table whose td elements do not contain one of two classes.

If at least one of the td elements in a row contains one of these two classes, then don't hide it. Otherwise, hide the entire row.

class='class1'  
class='class2'  
id='mytable'

Any ideas?

Answer 1

Without an example it's difficult to know exactly what you are looking for, but perhaps something like this would work (air code):

$('#mytable tr').each(function() {
    var count = $('td.class1, td.class2', $(this)).length;
    if (!count) {
        $(this).hide();
    }
});

Answer 2

You can use this approach, perhaps it is not the shortest one, but hopefully clear to follow. Lookup find, hasClass, eq methods in jQuery to learn more.

var trs = $("table tr")

for( var i = 0; i < trs.length; i++) {
    var tds = $(trs.eq(i)).find("td");
  var trToKeep = true;
  for (var j = 0; j < tds.length; j++) {
    if (tds.eq(j).hasClass("x") || tds.eq(j).hasClass("y")){
        trToKeep = true;
      break;
    }
    else {
        trToKeep = false;
    }
  }
  if (trToKeep === false) {
  trs.eq(i).hide();
  } 
}

Working jsFiddle is here (classes you would look for are x or y):

https://jsfiddle.net/Turo/aj55q33w/

---

Update: Updated my answer as you wanted to hide the ones that do not have the classes, not the ones that do.

Answer 3

You can loop through the rows and check the class of each td . I have loop through and used array and flag to decide whether to show or hide. I also hide all at first then show them later with condition check.

var classNames = ['red', 'green'];
$(document).ready(function() {
  $('table tbody tr').each(function() {
    var show = false;
    $(this).hide();
    $('td', this).each(function() {
      var tdClass = $(this).attr('class');
      if ($.inArray(tdClass, classNames) != -1) {
        show = true;
      }
    });
    if (show) {
      $(this).show();
    }
  });
});