在特定段落<p>元素上动态更改字体大小？

Question

以下JSFiddle将文本拆分为<p>具有设置文本限制的单个段落框.

---

是否可以根据select选项通过contenteditable更改框中的文本大小,同时仍然允许编辑,删除文本限制和保留动态大小属性？

更新2:生成的框都需要:

"等于相同的高度和宽度",

并在动态更新字体时更改,需要在所有元素中保持一致.

更新3:最后生成的段落不等于边框大小高度的其他段落.

更新4:所有段落都需要与height属性auto一样生成.当前答案的问题在于,最后生成的段落边界也需要与前一个高度边界相同的高度与其他段落相同,包括更改字体大小时.

更新5 [图像]:上一个分段高度和边框不等于其他的问题示例.

链接到小提琴

如果可以提供一个新的小提琴,我将非常感激,因为我还是新编码.谢谢!

$(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

在这里你去JSFiddle

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

Answer 2

我不确定我是否理解这个问题...您可以将字体大小设置为父元素（#content{font-size:whatever}）并继承它（#content p {font-size:inherit} ）。如果您在父级中设置字体大小，则将应用于已添加的段落以及添加它们时的新段落。

（小提琴中的变化：选择器中的选择器的变化，“p”和“#content p”的CSS选择器/属性）

（针对“相同高度”段落编辑的答案）为了获得相同的高度，我添加了相同的高度（选择器）函数。我不确定您何时想触发它，我已将其放在选择更改和重新排列（文本）上。（希望有帮助。使用outerHeight修复了函数中的高度）...并再次编辑小提琴：在窗口调整大小事件上也会触发sameheight。

function sameheight(selector){
var max_y=0;
var y=0;
$(selector).css('height','');
$(selector).each(function(){
  y=$(this).height();
  if(y>max_y) max_y=y;
});
$(selector).css('height',max_y);
}

function sameheight(selector){
var max_y=0;
var y=0;
$(selector).css('height','');
$(selector).each(function(){
  y=$(this).height();
  if(y>max_y) max_y=y;
});
$(selector).css('height',max_y);
}

$(function() {
  $('select').on('change', function() {
    //Lets target the parent element, instead of P. P will inherit it's font size (css)
    var targets = $('#content'),
      property = this.dataset.property;
    targets.css(property, this.value);
    sameheight('#content p');
  }).prop('selectedIndex', 0);
});
$( window ).resize(function() {
    sameheight('#content p');
});
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);
  });
  sameheight('#content p');
}

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;
}

 function sameheight(selector){
var max_y=0;
var y=0;
$(selector).css('height','');
$(selector).each(function(){
  y=$(this).outerHeight();
  if(y>max_y) max_y=y;
});
$(selector).css('height',max_y);
  }

#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 {
 /*Here the sliles for OTHER paragraphs*/
}
#content p {
  font-size:inherit;/*So it gets the font size set on the #content div*/
  padding: 1.2em .5em;
  margin: 1.4em 0;
  border: 1px dashed #aaa;
  overflow:hidden;
}