javascript - 在特定段落 元素上动态更改字体大小？

Question

以下 JSFiddle 将文本拆分为单独的段落 <p>具有设置文本限制的框。

---

是否可以根据通过 contenteditable 的选择选项更改框中的文本大小，同时仍然允许编辑、删除文本限制并保留动态大小属性？

更新 2:生成的所有框都需要:

“高度和宽度相同”

并更改当字体动态更新时，需要在所有元素之间保持一致。

更新 3:最后生成的段落与边框大小高度不相等的其他段落。

更新 4:所有段落都需要使用高度属性自动生成。当前答案的问题是，最后生成的段落边框也需要与之前的高度边框与其他段落的高度相同，包括在更改字体大小时。

更新 5 [图片]:最后一个分割段落的高度和边框不等于其他问题的示例。

链接到 Fiddle

如果可以提供新的 fiddle ，我将不胜感激，因为我对编码还是个新手。谢谢你!

$(function() {
  $('select').on('change', function() {
    var targets = $('p'),
      property = this.dataset.property;
    targets.css(property, this.value);
  }).prop('selectedIndex', 0);
});
var btn = document.getElementById('go'),
  textarea = document.getElementById('textarea1'),
  content = document.getElementById('content'),
  chunkSize = 100;
btn.addEventListener('click', initialDistribute);
content.addEventListener('keyup', handleKey);
content.addEventListener('paste', handlePaste);

function initialDistribute() {
  var text = textarea.value;
  while (content.hasChildNodes()) {
    content.removeChild(content.lastChild);
  }
  rearrange(text);
}

function rearrange(text) {
  var chunks = splitText(text, false);
  chunks.forEach(function(str, idx) {
    para = document.createElement('P');
    para.setAttribute('contenteditable', true);
    para.textContent = str;
    content.appendChild(para);
  });
}

function handleKey(e) {
  var para = e.target,
    position,
    key, fragment, overflow, remainingText;
  key = e.which || e.keyCode || 0;
  if (para.tagName != 'P') {
    return;
  }
  if (key != 13 && key != 8) {
    redistributeAuto(para);
    return;
  }
  position = window.getSelection().getRangeAt(0).startOffset;
  if (key == 13) {
    fragment = para.lastChild;
    overflow = fragment.textContent;
    fragment.parentNode.removeChild(fragment);
    remainingText = overflow + removeSiblings(para, false);
    rearrange(remainingText);
  }
  if (key == 8 && para.previousElementSibling && position == 0) {
    fragment = para.previousElementSibling;
    remainingText = removeSiblings(fragment, true);
    rearrange(remainingText);
  }
}

function handlePaste(e) {
  if (e.target.tagName != 'P') {
    return;
  }
  overflow = e.target.textContent + removeSiblings(fragment, true);
  rearrange(remainingText);
}

function redistributeAuto(para) {
  var text = para.textContent,
    fullText;
  if (text.length > chunkSize) {
    fullText = removeSiblings(para, true);
  }
  rearrange(fullText);
}

function removeSiblings(elem, includeCurrent) {
  var text = '',
    next;
  if (includeCurrent && !elem.previousElementSibling) {
    parent = elem.parentNode;
    text = parent.textContent;
    while (parent.hasChildNodes()) {
      parent.removeChild(parent.lastChild);
    }
  } else {
    elem = includeCurrent ? elem.previousElementSibling : elem;
    while (next = elem.nextSibling) {
      text += next.textContent;
      elem.parentNode.removeChild(next);
    }
  }
  return text;
}

function splitText(text, useRegex) {
  var chunks = [],
    i, textSize, boundary = 0;
  if (useRegex) {
    var regex = new RegExp('.{1,' + chunkSize + '}\\b', 'g');
    chunks = text.match(regex) || [];
  } else {
    for (i = 0, textSize = text.length; i < textSize; i = boundary) {
      boundary = i + chunkSize;
      if (boundary <= textSize && text.charAt(boundary) == ' ') {
        chunks.push(text.substring(i, boundary));
      } else {
        while (boundary <= textSize && text.charAt(boundary) != ' ') {
          boundary++;
        }
        chunks.push(text.substring(i, boundary));
      }
    }
  }
  return chunks;
}

#text_land {
  border: 1px solid #ccc;
  padding: 25px;
  margin-bottom: 30px;
}
textarea {
  width: 95%;
}
label {
  display: block;
  width: 50%;
  clear: both;
  margin: 0 0 .5em;
}
label select {
  width: 50%;
  float: right;
}
* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
body {
  font-family: monospace;
  font-size: 1em;
}
h3 {
  margin: 1.2em 0;
}
div {
  margin: 1.2em;
}
textarea {
  width: 100%;
}
button {
  padding: .5em;
}
p {
  padding: 1.2em .5em;
  margin: 1.4em 0;
  border: 1px dashed #aaa;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="styles">
  <label>Font-size:
    <select data-property="font-size">
      <option disabled>
        Select font-size:
      </option>
      <option>
        smaller
      </option>
      <option>
        10px
      </option>
      <option>
        12px
      </option>
      <option>
        14px
      </option>
      <option>
        16px
      </option>
      <option>
        18px
      </option>
      <option>
        20px
      </option>
      <option>
        larger
      </option>
    </select>
  </label>
</div>
<div>
  <h3>Paste text in the field below to divide text into paragraphs..</h3>
  <textarea id="textarea1" placeholder="Type text here, then press the button below." rows="5">
  </textarea>
  <br>
  <br>
  <button id="go">Divide Text into Paragraphs</button>
</div>
<div>
  <h3 align="right">Divided Text Will Appear Below:</h3>
  <hr>
  <div id="content"></div>
</div>

Answer 1

给你 JSFiddle

$('#FontSize').change(function(){
var fontsize = $(this).val();
$('textarea').css('fontSize',fontsize);
});