ContentEditable div - 第一个' x'之后的所有HTML字符

时间:2015-07-18 18:01:46

标签: jquery contenteditable

我一直在研究一个可压缩的div,我会在超过规定的最大长度时突出显示文本。

Codepen在这里: http://codepen.io/doublesidedstickytape/pen/NqBMXR

一切正常 - 除非用户按下Return键 - 然后它会中断!

我认为我可以在第一个[x]数量的字符之后获取所有HTML内容,然后循环遍历每个元素(充当新行) - 围绕它们包装高亮类在我隐藏的div。

我不知道如何实现这一目标。

HTML

<div class="wrapper">
  <div contenteditable="true" data-maxlength="10" class="editable"></div>
  <div contenteditable="true" class="readonly"></div>
</div>

JS

$(document).on("keyup", "div.editable", function(event) {

  // GOOD TO STORE THIS IN A VAR
  // PREVENTS THE BROWSER HAVING TO 
  // FIGURE OUT WHAT $(this) IS
  // EACH TIME YOU CALL IT
  var element = $(this);

  // KEYUP  
  if (event.type == "keyup") {

    var maximumLength = element.attr("data-maxlength");
    var currentLength = element.text().length;
    var content = element.text();

    // CURRENT LENGTH IS GREATER THAN
    // THE SPECIFIED MAXIMUM LENGTH
    if (currentLength > maximumLength) {
      var over = element.html().substr(maximumLength);
      over = "<span class='highlight'>" + over + "</span>";
      content = element.html().substr(0, maximumLength) + over;
    }
    $("div.readonly").html(content);

  }

});

CSS

body {
  margin: 0 auto;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1em;
  line-height: 1.4em;
  color: #444;
}

div.wrapper {
  position: relative;
  margin-top: 15px;
}

div.editable,
div.readonly {
  width: 300px;
  white-space: wrap;
  position: absolute;
  top: 0;
  left: 0;
}

div.editable {
  border-bottom: 1px solid #00aeed;
  outline: none;
}

div.readonly {
  z-index: -99;
  color: transparent;
  background: transparent;
}

span.highlight {
  background: #fcc !important;
}

&#13;
&#13;
$(document).on("keyup", "div.editable", function(event) {

  // GOOD TO STORE THIS IN A VAR
  // PREVENTS THE BROWSER HAVING TO 
  // FIGURE OUT WHAT $(this) IS
  // EACH TIME YOU CALL IT
  var element = $(this);

  // KEYUP  
  if (event.type == "keyup") {

    var maximumLength = element.attr("data-maxlength");
    var currentLength = element.text().length;
    var content = element.text();

    // CURRENT LENGTH IS GREATER THAN
    // THE SPECIFIED MAXIMUM LENGTH
    if (currentLength > maximumLength) {
      var over = element.html().substr(maximumLength);
      over = "<span class='highlight'>" + over + "</span>";
      content = element.html().substr(0, maximumLength) + over;
    }
    $("div.readonly").html(content);

  }

});
&#13;
body {
  margin: 0 auto;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1em;
  line-height: 1.4em;
  color: #444;
}
div.wrapper {
  position: relative;
  margin-top: 15px;
}
div.editable,
div.readonly {
  width: 300px;
  white-space: wrap;
  position: absolute;
  top: 0;
  left: 0;
}
div.editable {
  border-bottom: 1px solid #00aeed;
  outline: none;
}
div.readonly {
  z-index: -99;
  color: transparent;
  background: transparent;
}
span.highlight {
  background: #fcc !important;
}
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

<div class="wrapper">
  <div contenteditable="true" data-maxlength="10" class="editable"></div>
  <div contenteditable="true" class="readonly"></div>
</div>
&#13;
&#13;
&#13;

1 个答案:

答案 0 :(得分:1)

我制定了一个解决方案,请参阅:http://jsfiddle.net/alan0xd7/6o1sr5fg/

  • 如果有需要突出显示的文字,首先我们只需将内容HTML复制到div.readonly进行进一步处理。如果不需要突出显示,我们只需清空div

  • collectTextNodes()函数遍历内容HTML中的所有DOM节点,并收集所有文本节点。收集的节点只包含文本,没有子节点。

  • 对于我们收集的所有文本节点,我们通过highlight()函数运行它们以突出显示文本。

  • highlight()首先跳过maximumLength个字符,然后将所有内容包装在<span class='highlight'>中。