Truncate element text length to 100 characters, but do not split words (you can go over 100 characters to do so). If it is truncated, i.e. shorter than the original length, add `...`

gistfile1.js

/* Setup */
for (var x = 0; x < 5; x++) {
  $("<div>").appendTo("body");
}
 
$("div").each(function () {
  $(this).text((new Array(Math.floor(20 + Math.random() * 4))).join('text '));
});
 
/* Truncation */
$("div").text(function (_, text) {
  if (!$(this).data('full-text')) {
    $(this).data('full-text', text);
  }
  var lastSpace = text.substr(100).split(/\s/).join(' ').indexOf(' ');
  if (lastSpace > -1) {
    return text.substr(0, 100 + lastSpace) + '...'
  }
});

/* Result */
$("div").text(function (_, text) {
  return text + ' ' + text.length;
});