如何避免从 jQuery 中的 contenteditable

中删除键入的文本

$(function() {
  function textWrapper(str, sp, btn) {
    if (sp == undefined) {
      sp = [0, 0];
    }
    var txt = "";
    if (btn) {
      txt = "<span class='w b'>" + str + "</span>";
    } else {
      txt = "<span class='w'>" + str + "</span>";
    }

    if (sp[0]) {
      txt = "&nbsp;" + txt;
    }

    if (sp[1]) {
      txt = txt + "&nbsp;";
    }

    return txt;
  }

  function chunkWords(p) {
    var words = p.split(" ");
    words[0] = textWrapper(words[0], [0, 1]);
    var i;
    for (i = 1; i < words.length; i++) {
      var re = /\[.+\]/;
      if (re.test(words[i])) {
        var b = makeTextBox(words[i].slice(1, -1));
        words[i] = "&nbsp;" + b.prop("outerHTML") + "&nbsp;";
      } else {
        if (words[0].indexOf(".")) {
          words[i] = textWrapper(words[i], [1, 0]);
        } else {
          words[i] = textWrapper(words[i], [1, 1]);
        }
      }
    }
    return words.join("");
  }

  function unChunkWords(tObj) {
    var words = [];
    $(".w", tObj).each(function(i, el) {
      console.log($(el).text(), $(el).attr("class"));
      if ($(el).hasClass("b")) {
        words.push("[" + $(el).text().trim() + "]");
      } else {
        words.push($(el).text().trim());
      }
    });
    return words.join(" ");
  }

  function makeBtn(tObj) {
    var btn = $("<span>", {
      class: "ui-icon ui-icon-close"
    }).appendTo(tObj);
  }

  function makeTextBox(txt) {
    var sp = $("<span>", {
      class: "w b"
    }).html(txt);
    makeBtn(sp);
    return sp;
  }

  function makeDropText(obj) {
    return obj.droppable({
      drop: function(e, ui) {
        var txt = ui.draggable.text();
        var newSpan = textWrapper(txt, [1, 0], 1);
        $(this).after(newSpan);
        makeBtn($(this).next("span.w"));
        makeDropText($(this).next("span.w"));
        $("span.w.ui-state-highlight").removeClass("ui-state-highlight");
      },
      over: function(e, ui) {
        $(this).add($(this).next("span.w")).addClass("ui-state-highlight");
      },
      out: function() {
        $(this).add($(this).next("span.w")).removeClass("ui-state-highlight");
      }
    });
  }

  $("p.given").html(chunkWords($("p.given").text()));

  $("p.given").on("click", ".b > .ui-icon", function() {
    $(this).parent().remove();
  });

  $("p.given").blur(function() {
    var w = unChunkWords($(this));
    console.log(w);
    $(this).html(chunkWords(w));
    makeDropText($("p.given span.w"));
  });

  $("span.given").draggable({
    helper: "clone",
    revert: "invalid"
  });

  makeDropText($("p.given span.w"));
});

p.given {
  display: flex;
  flex-wrap: wrap;
}

p.given span.w span.ui-icon {
  cursor: pointer;
}

div.blanks {
  display: inline-block;
  min-width: 50px;
  border-bottom: 2px solid #000000;
  color: #000000;
}

div.blanks.ui-droppable-active {
  min-height: 20px;
}

span.answers>b {
  border-bottom: 2px solid #000000;
}

span.given {
  margin: 5px;
}

<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<div class="row">
  <p class="given" contenteditable="true">Lorem Ipsum is simply dummy text of the printing and typesetting industry. [Lorem] Ipsum has been the industry's standard dummy text ever since the 1500s, Lorem Ipsum is simply dummy text of the printing and typesetting industry.</p>
</div>

<div class="divider"></div>
<div class="section">
  <section>
    <div class="card blue-grey ">
      <div class="card-content white-text">
        <div class="row">
          <div class="col s12">
            <span class="given btn-flat white-text red lighten-1" rel="1">the Santee, thDakota</span>
            <span class="given btn-flat white-text red lighten-1" rel="2">America</span>
            <span class="given btn-flat white-text red lighten-1" rel="3">Qatar</span>
            <span class="given btn-flat white-text red lighten-1" rel="4">Philippines</span>
          </div>
        </div>
      </div>
    </div>
  </section>
</div>